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1

Photo of the Week: The Mirror Fusion Test Facility | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

The Mirror Fusion Test Facility The Mirror Fusion Test Facility Photo of the Week: The Mirror Fusion Test Facility July 19, 2013 - 4:17pm Addthis This 1981 photo shows the Mirror Fusion Test Facility (MFTF), an experimental magnetic confinement fusion device built using a magnetic mirror at Lawrence Livermore National Laboratory (LLNL). The MFTF functioned as the primary research center for mirror fusion devices. The design consisted of a 64-meter-long vacuum vessel fitted with 26 coil magnets bonding the center of the vessel and two 400-ton yin-yang magnet mirrors at either end. The first magnet produced a magnetic field force equal to the weight of 30 jumbo jets hanging from the magnet coil. | Photo courtesy of Lawrence Livermore National Laboratory. This 1981 photo shows the Mirror Fusion Test Facility (MFTF), an

2

Particle Deconfinement in a Bent Magnetic Mirror  

SciTech Connect (OSTI)

Coils misalignment in a magnetic mirror can produce additional particle transport. The magnetic field non axi-symmetry is responsible for radial and longitudinal drifts in a way much similar to the neo-classical transport in a tandem mirror cell distorted by end plugs. Accordingly, a regime exhibiting large radial displacements - similar to the resonant regime in tandem mirrors - can be obtained by confining ions azimuthally, for example by means of a properly tuned radial electric field. Because of the mass dependence of the magnetic field non-homogeneity drift velocities, the azimuthal trapping is mass specific, allowing in principle the filtering of a specific species based on its mass.

Renaud Gueroult and Nathaniel J. Fisch

2012-09-06T23:59:59.000Z

3

A HYBRID SOLAR WIND MODEL OF THE CESE+HLL METHOD WITH A YIN-YANG OVERSET GRID AND AN AMR GRID  

SciTech Connect (OSTI)

A hybrid three-dimensional (3D) MHD model for solar wind study is proposed in the present paper with combined grid systems and solvers. The computational domain from the Sun to Earth space is decomposed into the near-Sun and off-Sun domains, which are respectively constructed with a Yin-Yang overset grid system and a Cartesian adaptive mesh refinement (AMR) grid system and coupled with a domain connection interface in the overlapping region between the near-Sun and off-Sun domains. The space-time conservation element and solution element method is used in the near-Sun domain, while the Harten-Lax-Leer method is employed in the off-Sun domain. The Yin-Yang overset grid can avoid well-known singularity and polar grid convergence problems and its body-fitting property helps achieve high-quality resolution near the solar surface. The block structured AMR Cartesian grid can automatically capture far-field plasma flow features, such as heliospheric current sheets and shock waves, and at the same time, it can save significant computational resources compared to the uniformly structured Cartesian grid. A numerical study of the solar wind structure for Carrington rotation 2069 shows that the newly developed hybrid MHD solar wind model successfully produces many realistic features of the background solar wind, in both the solar corona and interplanetary space, by comparisons with multiple solar and interplanetary observations.

Feng Xueshang; Zhang Shaohua; Xiang Changqing; Yang Liping; Jiang Chaowei [SIGMA Weather Group, State Key Laboratory for Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190 (China); Wu, S. T., E-mail: fengx@spaceweather.ac.cn [Center for Space Plasma and Aeronomic Research, University of Alabama in Huntsville, AL 35899 (United States)

2011-06-10T23:59:59.000Z

4

A Hybrid Solar Wind Model of the CESE+HLL Method with a Yin-Yang Overset Grid and an AMR Grid  

Science Journals Connector (OSTI)

A hybrid three-dimensional (3D) MHD model for solar wind study is proposed in the present paper with combined grid systems and solvers. The computational domain from the Sun to Earth space is decomposed into the near-Sun and off-Sun domains, which are respectively constructed with a Yin-Yang overset grid system and a Cartesian adaptive mesh refinement (AMR) grid system and coupled with a domain connection interface in the overlapping region between the near-Sun and off-Sun domains. The space-time conservation element and solution element method is used in the near-Sun domain, while the Harten-Lax-Leer method is employed in the off-Sun domain. The Yin-Yang overset grid can avoid well-known singularity and polar grid convergence problems and its body-fitting property helps achieve high-quality resolution near the solar surface. The block structured AMR Cartesian grid can automatically capture far-field plasma flow features, such as heliospheric current sheets and shock waves, and at the same time, it can save significant computational resources compared to the uniformly structured Cartesian grid. A numerical study of the solar wind structure for Carrington rotation 2069 shows that the newly developed hybrid MHD solar wind model successfully produces many realistic features of the background solar wind, in both the solar corona and interplanetary space, by comparisons with multiple solar and interplanetary observations.

Xueshang Feng; Shaohua Zhang; Changqing Xiang; Liping Yang; Chaowei Jiang; S. T. Wu

2011-01-01T23:59:59.000Z

5

Buildup studies of a tandem mirror reactor with inboard thermal barriers  

SciTech Connect (OSTI)

The build-up and quasi-steady state phases of the operation of the tandem mirror experiment, TMX, and of a tandem mirror machine with inboard thermal barriers, MFTF-B, have been simulated using a fluid model of the central cell and plug plasmas. The fluid model incorporates classical radial transport, three-dimensional cold gas transport in cylindrical geometry, and neutral beam transport corrected for finite-Larmor-orbit effects in both the central cell and yin yang end plugs.

Gryczkowski, G.E.; Gilmore, J.M.

1980-10-09T23:59:59.000Z

6

Studies of Cryogenic Electron Plasmas in Magnetic Mirror Fields  

E-Print Network [OSTI]

Studies of Cryogenic Electron Plasmas in Magnetic Mirror Fields by Ramesh Gopalan A.B. (University: Chair Date Date Date University of California at Berkeley 1998 #12;Studies of Cryogenic Electron Plasmas in Magnetic Mirror Fields Copyright 1998 by Ramesh Gopalan #12;1 Abstract Studies of Cryogenic Electron

Fajans, Joel

7

Magnetic-mirror principle as applied to fusion research  

SciTech Connect (OSTI)

A tutorial account is given of the key physics issues in the confinement of high temperature plasma in magnetic mirror systems. The role of adiabatic invariants and particle drifts and their relationship to equilibrium and stability are discussed, in the context of the various forms of mirror field geometry. Collisional effects and the development and the control of ambipolar potentials are reviewed. The topic of microinstabilities is discussed together with the means for their control. The properties and advantages for fusion power purposes of various special embodiments of the mirror idea, including tandem mirrors, are discussed.

Post, R.F.

1983-08-11T23:59:59.000Z

8

Development of magnetic mirror systems for nuclear testing applications  

SciTech Connect (OSTI)

Several system studies have concluded that the small size and steady state nature of magnetic mirror systems provide attractive features for nuclear-testing applications. The principle shortcoming of mirror systems is their small data base relative to that of tokamaks. This paper summarizes the present data base and describes experiments that could be carried out with small modifications of existing facilities to explore plasma physics issues associated with the production of high neutron fluxes in magnetic mirror configurations. The experiments would demonstrate physics principles important to such future applications of fusion power neutrons as blanket testing, tritium production, fissile fuel production, or decontamination of high-level radioactive nuclear-reactor wastes.

Simonen, T.C.; Futch, A.H.; Kaiser, T.B.

1986-08-07T23:59:59.000Z

9

Neutron to mirror-neutron oscillations in the presence of mirror magnetic fields  

Science Journals Connector (OSTI)

We performed ultracold neutron storage measurements to search for additional losses due to neutron (n) to mirror-neutron (n?) oscillations as a function of an applied magnetic field B. In the presence of a mirror magnetic field B?, ultracold neutron losses would be maximal for B?B?. We did not observe any indication for nn? oscillations and placed a lower limit on the oscillation time of ?nn?>12.0??s at 95% C.L. for any B? between 0 and 12.5???T.

I. Altarev et al.

2009-08-17T23:59:59.000Z

10

Electron Plasmas in a Magnetic Mirror  

E-Print Network [OSTI]

scale with the magnetic field strength; the electrostatic potential varies along the field lines to make this density variation possible. Further, the plasma profile does not follow the magnetic field lines proportional to magnetic field. · Potential varies along field lines. · Outer plasma radius necks down more

Wurtele, Jonathan

11

Collisional Processes at Low Densities in Magnetic Mirror Systems  

Science Journals Connector (OSTI)

The study of collisional processes in plasmas produced by neutral?atom injection into magnetic mirror fields is described. The emphasis is on the many collisional processes which occur as the plasma density increases. Experimental and theoretical results are given. The experimental results are discussed first in terms of a simple model which assumes a Maxwellian electron distribution and a monoenergetic ion component of much higher energy. Analytical solutions may be obtained for this model. Also presented is a more complete theory employing two time?dependent Fokker?Planck equations to describe the behavior of the electron and ion distribution functions. Both models are in good agreement with measured values of the electron temperature and plasma potential. The equilibrium values of these two quantities are found to vary as the 3 5 power of the ratio of the plasma density to the background?gas density.

A. H. Futch; C. C. Damm; J. H. Foote; A. L. Gardner; J. Killeen

1971-01-01T23:59:59.000Z

12

Status and development of magnetic mirror systems for nuclear testing applications  

SciTech Connect (OSTI)

Several system studies have concluded that the small size and steady-state nature of magnetic mirror systems provide attractive features of nuclear testing applications such as blanket testing, fissile fuel production, tritium production, or decontamination of high-level radioactive nuclear reactor wastes. A summary of the data base is presented, and next-generation experiments that could be carried out to explore plasma physics issues associated with the production of high neutron fluxes in magnetic mirror configurations are described.

Simonen, T.C.; Futch, A.H.; Kaiser, T.B.

1988-09-01T23:59:59.000Z

13

Enhanced loss of magnetic-mirror-trapped fast electrons by a shear Alfvn wave  

SciTech Connect (OSTI)

Laboratory observations of enhanced loss of magnetic mirror trapped fast electrons irradiated by a shear Alfvn Wave (SAW) are reported. The experiment is performed in the quiescent after-glow plasma in the Large Plasma Device [Gekelman et al., Rev. Sci. Instrum. 62(12), 28752883 (1991)]. A trapped energetic electron population (>100?keV) is generated in a magnetic mirror section (mirror ratio???2, length?=?3.5?m) by an X-mode high power microwave pulse, and forms a hot electron ring due to the grad-B and curvature drift. SAWs of arbitrary polarization are launched externally by a Rotating Magnetic Field source (?B/B{sub 0}???0.1%, ?{sub ?}???9?m). Irradiated by a right-handed circularly polarized SAW, the loss of electrons, in both the radial and the axial direction of the mirror field, is significantly enhanced and is modulated at f{sub Alfvn}. The periodical loss continues even after the termination of the SAW. Experimental observations suggest that a spatial distortion of the ring is formed in the SAW field and creates a collective mode of the hot electron population that degrades its confinement and leads to electron loss from the magnetic mirror. The results could have implications on techniques of radiation belt remediation.

Wang, Y.; Gekelman, W.; Pribyl, P. [Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States)] [Department of Physics and Astronomy, University of California, Los Angeles, California 90095 (United States); Papadopoulos, K. [Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (United States)] [Department of Physics and Astronomy, University of Maryland, College Park, Maryland 20742 (United States)

2014-05-15T23:59:59.000Z

14

Elliptical magnetic mirror generated via resistivity gradients for fast ignition inertial confinement fusion  

SciTech Connect (OSTI)

The elliptical magnetic mirror scheme for guiding fast electrons for Fast Ignition proposed by Schmitz et al. (Plasma Phys. Controlled Fusion 54, 085016 (2012)) is studied for conditions on the multi-kJ scale which are much closer to full-scale Fast Ignition. When scaled up, the elliptical mirror scheme is still highly beneficial to Fast Ignition. An increase in the coupling efficiency by a factor of 34 is found over a wide range of fast electron divergence half-angles.

Robinson, A. P. L.; Schmitz, H. [Central Laser Facility, STFC Rutherford-Appleton Laboratory, Didcot OX11 0QX (United Kingdom)] [Central Laser Facility, STFC Rutherford-Appleton Laboratory, Didcot OX11 0QX (United Kingdom)

2013-06-15T23:59:59.000Z

15

Magnetic Mirrors at the Nanoscale : Theory M. P. J. L. Chang, D. Jia1 and H. Nazari2  

E-Print Network [OSTI]

such as electrons tend to move through a magnetic field by following a helical path about a magnetic field line. A magnetic mirror is a static magnetic field that, within a localized region, has a strong gradient (provided their velocity vector is not wholly parallel to the field line). If the field lines along the path

Chang, Mark J. L.

16

On the feasibility of electron cyclotron heating of overcritical plasma in a magnetic mirror trap  

SciTech Connect (OSTI)

The feasibility of matching electromagnetic radiation in the electron cyclotron frequency range to a dense plasma in an open magnetic trap by producing an inverted (with a minimum on the axis) plasma density profile is discussed. The use of such a profile shows promise for the implementation of efficient cyclotron heating at plasma densities above the critical density, at which the Langmuir frequency is equal to the heating radiation frequency. Examples of the magnetic field and plasma density distributions in a mirror trap are presented for which analysis of the beam trajectories shows the feasibility of efficient electron cyclotron absorption of microwave beams in overcritical plasma.

Vodopyanov, A. V.; Golubev, S. V.; Gospodchikov, E. D.; Smolyakova, O. B.; Suvorov, E. V. [Russian Academy of Sciences, Institute of Applied Physics (Russian Federation)

2012-06-15T23:59:59.000Z

17

Isorotation and differential rotation in a magnetic mirror with imposed E Multiplication-Sign B rotation  

SciTech Connect (OSTI)

Doppler spectroscopy of helium impurities in the Maryland Centrifugal Experiment reveals the simultaneous existence of isorotating and differentially rotating magnetic surfaces. Differential rotation occurs at the innermost surfaces and is conjectured to cause plasma voltage oscillations of hundreds of kilohertz by periodically changing the current path inductance. High-speed images show the periodic expulsion of plasma near the mirror ends at the same frequencies. In spite of this, the critical ionization velocity limit is exceeded, with respect to the vacuum field definition, for at least 0.5 ms.

Romero-Talamas, C. A.; Elton, R. C.; Young, W. C.; Reid, R.; Ellis, R. F. [Institute for Research in Electronics and Applied Physics, University of Maryland, College Park, Maryland 20742 (United States)

2012-07-15T23:59:59.000Z

18

Achievement of a record electron temperature for a magnetic mirror device  

E-Print Network [OSTI]

We demonstrate plasma discharges with extremely high temperature of bulk electrons at the large axially symmetric magnetic mirror device GDT (Budker Institute, Novosibirsk). According to Thomson scattering measurements, the on-axis electron temperature averaged over several sequential shots is 660 $\\pm$ 50 eV with peak values exceeding 900 eV in few shots. This corresponds to at least threefold increase as compared to previous experiments both at the GDT and at other comparable machines, thus demonstrating the maximum quasi-stationary (~1 ms) electron temperature achieved in open traps. The breakthrough is made possible with application of sophisticated electron cyclotron resonance heating in addition to standard heating by neutral beams. The reported increase of the electron temperature along with previous experiments, which demonstrated high-density plasma confinement with $\\beta\\approx$ 60%, provide a firm basis for extrapolating to fusion relevant applications of open magnetic systems.

Bagryansky, P A; Lizunov, A A; Maximov, V V; Prikhodko, V V; Shalashov, A G; Soldatkina, E I; Solomakhin, A L; Yakovlev, D V

2014-01-01T23:59:59.000Z

19

Magnetic mirror fusion-fission early history and applicability to other systems  

SciTech Connect (OSTI)

In the mid 1970s to mid 1980s the mirror program was stuck with a concept, the Standard Mirror that was Q {approx} 1 where Q=P{sub fusion}/P{sub injection}. Heroic efforts were put into hybridizing thinking added energy and fuel sales would make a commercial product. At the same time the tokamak was thought to allow ignition and ultrahigh Q values of 20 or even higher. There was an effort to use neutral beams to drive the tokamak just like the mirror machines were driven in which case the Q value plunged to a few, however this was thought to be achievable decades earlier than the high Q versions. Meanwhile current drive and other features of the tokamak have seen the projected Q values come down to the range of 10. Meanwhile the mirror program got Q enhancement into high gear and various tandem mirrors projected Q values up towards 10 and with advanced features over 10 with axi-symmetric magnets (See R. F. Post papers), however the experimental program is all but non-existent. Meanwhile, the gas dynamic trap mirror system which is present day state-of-the-art can with low risk produce Q of {approx}0.1 useful for a low risk, low cost neutron source for materials development useful for the development of materials for all fusion concepts (see Simonen white paper: 'A Physics-Based Strategy to Develop a Mirror Fusion-Fission Hybrid' and D.D. Ryutov, 'Axisymmetric MHD-stable mirror as a neutron source and a driver for a fusion-fission hybrid'). Many early hybrid designs with multi-disciplinary teams were carried out in great detail for the mirror system with its axi-symmetric blanket modules. It is recognized that most of these designs are adaptable to tokamak or inertial fusion geometry. When Q is low (1 to 2) economics gives a large economic penalty for high recirculating power. These early studies covered the three design types: Power production, fuel production and waste burning. All three had their place but power production fell away because every study showed fusion machines that were extensively studied by multidisciplinary teams came up with power costs much higher than for existing fission plants except in very large sizes (3 GWe). There was lots of work on waste burning - Ted Parrish - comes to mind. However, fuel production along with power production became nearly everyone's goals. First, fast-fission blankets were favored but later to enhance safety, fission-suppressed blankets came into vogue. Both fuel producing and waste burning hybrid studies were terminated with the advent of accidents, high interest rates, rising 'green like' movement and cheap natural gas for power production. For waste burning and fast-fission fuel producing designs, the blanket energy multiplication was about 10 and economics was OK relative to recirculating power for Q over 2. For fission-suppressed fuel producers, where the blanket multiplication is under 2, the Q needed was over 5. In the mirror program we came at this problem by trying to find a product for mirror fusion technology. We hoped we had a product and studied and promoted it. There was no market pull and when the mirror program collapsed in the US, so did both hybrid programs for mirrors and tokamaks and IFE by the mid 1980s. Today, the problem of what to do with wastes that were supposed to be accepted by the government appears to be a high value market pull. It remains to be shown if fusion neutrons can be generated at low enough cost so that economics will not be a showstopper. For burning only the minor actinides, the economics will be the most favorable. Burning the Pu as well will lower the number of fission reactors supported by each burner fusion machine and hurt economics of the system. The fuel-producing role of fusion to fuel fission reactors remains an important possible use of fusion especially in the early stages of fusion development. It is not clear that burning fission wastes in a fusion machine is more appropriate than burning these wastes in specially designed fission machines. Fusion can produce U-233 along with over 2.4%U-232 making the material large

Moir, R

2009-08-24T23:59:59.000Z

20

Current Helicity and Twist as Two Indicators of The Mirror Asymmetry of solar Magnetic Fields  

E-Print Network [OSTI]

A comparison between the two tracers of magnetic field mirror asymmetry in solar active regions, twist and current helicity, is presented. It is shown that for individual active regions these tracers do not possess visible similarity while averaging by time over the solar cycle, or by latitude, reveals similarities in their behaviour. The main property of the dataset is anti-symmetry over the solar equator. Considering the evolution of helical properties over the solar cycle we find signatures of a possible sign change at the beginning of the cycle, though more systematic observational data are required for a definite confirmation. We discuss the role of both tracers in the context of the solar dynamo theory.

D. D. Sokoloff; H. Zhang; K. Kuzanyan; V. N. Obridko; D. N. Tomin; V. N. Tutubalin

2008-02-25T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

Cooperative Effects in a Tenuous Energetic Plasma Contained by a Magnetic Mirror Field  

Science Journals Connector (OSTI)

The formation and characteristics of a steady?state hydrogen plasma contained in a magnetic mirror field are described. The mean ion energy is 20 keV. The plasma is formed by ionizing and trapping a portion of a beam of energetic hydrogen atoms passing through the confining field. The methods of measurement used to determine the plasma properties are described. Measurements of the radial and azimuthal trapped?ion distributions the average ion and electron densities and the plasma potential are compared with the predictions of simple theory neglecting cooperative plasma effects. The observed deviations from these simple predictions show that the plasma properties are dominated by cooperative phenomena. The plasma density is found to be limited to a low value (?4 107 ions/cm3) by a flute or drift instability. This instability is characterized by a low frequency rotation of the plasma at a frequency typically close to the ?B precession frequency of a 20?keV proton in the nonuniform mirror field. The plasma density at the unstable limit is observed to be related to the value of plasma potential. This relationship can be understood quantitatively by an extension of an earlier theoretical treatment of the drift instability to the case of unequal ion and electron densities. The flute oscillation frequency is also derived from this theory. Oscillations at the ion gyrofrequency are observed marking the presence of an electrostatic resonance type of instability. Coupling of these modes with the flute oscillations is described but detailed identification of the electrostatic resonance modes cannot yet be made.

C. C. Damm; J. H. Foote; A. H. Futch Jr.; A. L. Gardner; F. J. Gordon; A. L. Hunt; R. F. Post

1965-01-01T23:59:59.000Z

22

Radial Fokker-Planck model for plasmas confined by magnetic mirror fields  

SciTech Connect (OSTI)

A time-dependent computer model has been developed for the spatially dependent distribution function f(r,v,t). An orbit averaged Fokker-Planck equation treats Coulomb collisions and various atomic physics processes. The motivation for the present code is to provide an accurate treatment of gyro-radius effects and realistic beam geometries which have been neglected in previous Fokker-Planck codes. Finite width beams may be offset from the plasma center to determine beam injection for build-up studies. The inclusion of a finite gyro-radius is essential for studying radial transport due to both quasilinear fluctuations and charge exchange collisions. Charge exchange with energetic beam atoms and plasma erosion due to charge-exchange collisions with thermal gas are both included. Quasilinear diffusion terms include the effects of turbulent diffusion in the model. The model has been used to study particle and energy confinement times in the 2XIIB experiment and in the mirror plug of the TMX experiment. Calculated values of T/sub e/ decrease from classical Fokker-Planck values (1000 eV for 2XIIB) to the 50 eV to 200 eV range observed in 2XIIB and TMX experiments. Radial density profiles and n tau scaling with plasma radius and magnetic field agree with experimental data.

Futch, A.H.

1986-05-01T23:59:59.000Z

23

Potential Structure Modified by Electron Cyclotron Resonance in a Plasma Flow along Magnetic Field Lines with Mirror Configuration  

Science Journals Connector (OSTI)

A plasma potential structure is modified by the electron cyclotron resonance (ECR) in a collisionless plasma flow along magnetic field lines with simple mirror configuration. In the presence of a single ECR point at the bottom of the magnetic well, there appears a potential dip (thermal barrier) around this point, being followed by a potential hump (plug potential) in the downstream side. The result in this simplified configuration gives a clear-cut physics to the formation of field-aligned plug potential with thermal barrier.

T. Kaneko; R. Hatakeyama; N. Sato

1998-03-23T23:59:59.000Z

24

Transport phenomena in stochastic magnetic mirrors Leonid Malyshkin 1 and Russell Kulsrud 2  

E-Print Network [OSTI]

@astro.princeton.edu August 21, 2000 ABSTRACT Parallel thermal conduction along stochastic magnetic field lines may be reduced magnetic field lines, and as a result, they have to go larger distances between hot and cold regions of space. (In other words, the temperature gradients are weaker along magnetic field lines.) The second

25

California | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

August 8, 2013 August 8, 2013 Audit Report: OAS-M-13-06 Lawrence Livermore National Laboratory's Use of Time and Materials Subcontracts July 22, 2013 EIS-0431: DOE Notice of Availability of Draft Environmental Impact Statement Hydrogen Energy California's Integrated Gasification Combined Cycle and Carbon Capture and Sequestration Project, Kern County, CA July 19, 2013 This 1981 photo shows the Mirror Fusion Test Facility (MFTF), an experimental magnetic confinement fusion device built using a magnetic mirror at Lawrence Livermore National Laboratory (LLNL). The MFTF functioned as the primary research center for mirror fusion devices. The design consisted of a 64-meter-long vacuum vessel fitted with 26 coil magnets bonding the center of the vessel and two 400-ton yin-yang magnet mirrors at either end. The first magnet produced a magnetic field force equal to the weight of 30 jumbo jets hanging from the magnet coil. | Photo courtesy of Lawrence Livermore National Laboratory.

26

Physics of mirror systems  

SciTech Connect (OSTI)

In recent years the emphasis in research on the magnetic mirror approach to fusion has been shifted to address what are essentially economically-motivated issues. The introduction of the Tandem Mirror idea solved in principal the problem of low Q (low fusion power gain) of mirror-based fusion systems. In order to optimize the tandem mirror idea from an economic standpoint, some important improvements have been suggested. These improvements include the thermal barrier idea of Baldwin and Logan and the axicell concept of Kesner. These new modifications introduce some special physics considerations. Among these are (1) The MHD stability properties of high energy electron components in the end cells; (2) The optimization of end-cell magnetic field configurations with the objective of minimizing equilibrium parallel currents; (3) The suppression of microstabilities by use of sloshing ion distributions. Following a brief outline of tandem mirror concepts, the above three topics are discussed, with illustrative examples taken from earlier work or from recent design studies.

Post, R.F.

1982-05-01T23:59:59.000Z

27

Fokker-Planck equation in mirror research  

SciTech Connect (OSTI)

Open confinement systems based on the magnetic mirror principle depend on the maintenance of particle distributions that may deviate substantially from Maxwellian distributions. Mirror research has therefore from the beginning relied on theoretical predictions of non-equilibrium rate processes obtained from solutions to the Fokker-Planck equation. The F-P equation plays three roles: Design of experiments, creation of classical standards against which to compare experiment, and predictions concerning mirror based fusion power systems. Analytical and computational approaches to solving the F-P equation for mirror systems will be reviewed, together with results and examples that apply to specific mirror systems, such as the tandem mirror.

Post, R.F.

1983-08-11T23:59:59.000Z

28

Switchable Mirrors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Switchable Mirrors Switchable Mirrors Speaker(s): Ronald Griessen Date: July 17, 2002 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Thomas Richardson Switchable mirrors based on rare earth hydrides were discovered in my laboratory in 1994. PhD student J.N. Huiberts observed a reversible metal-to-insulator transition when a thin film (150 to 500 nm) of yttrium or lanthanum coated with a thin layer of palladium was exposed to hydrogen gas. The transition accompanies conversion of a metallic dihydride phase to a semiconducting trihydride. Since then, our group has carried out fundamental research that has elucidated many important aspects of switchable mirror phenomena. This talk will include demonstrations of the spectacular changes in optical properties in rare earth hydride films, and

29

Mirror mount  

DOE Patents [OSTI]

A mirror mount is provided that allows free pitch, yaw and roll motion of the mirror while keeping the location of a point on the surface of the mirror fixed in the rest frame of reference of the mount. Yaw movement is provided by two yaw cylinders that are bearing mounted to provide rotation. Pitch and roll motion is provided by a spherically annular shell that is air bearing mounted to move between a clamp and an upper pedestal bearing. The centers of curvature of the spherical surfaces of the shell lie upon the point. Pitch motion and roll motion are separately and independently imparted to mirror by a pair of pitch paddles and a pair of roll paddles that are independently and separately moved by control rods driven by motors.

Humpal, H.H.

1986-03-21T23:59:59.000Z

30

Mirror mount  

DOE Patents [OSTI]

A mirror mount (10) is provided that allows free pitch, yaw and roll motion of the mirror (28) while keeping the location of a point (56) on the surface of the mirror (28) fixed in the rest frame of reference of the mount (10). Yaw movement is provided by two yaw cylinders (30,32) that are bearing (52) mounted to provide rotation. Pitch and roll motion is provided by a spherically annular shell (42) that is air bearing (72,74) mounted to move between a clamp (60) and an upper pedestal bearing (44). The centers of curvature of the spherical surfaces of the shell (42) lie upon the point (56). Pitch motion and roll motion are separately and independently imparted to mirror (28) by a pair of pitch paddles (34) and a pair of roll paddles (36) that are independently and separately moved by control rods (76,80) driven by motors (78,82).

Humpal, Harold H. (San Ramon, CA)

1987-01-01T23:59:59.000Z

31

Mirror mount  

DOE Patents [OSTI]

A mirror mount is provided that allows free pitch, yaw and roll motion of the mirror while keeping the location of a point on the surface of the mirror fixed in the rest frame of reference of the mount. Yaw movement is provided by two yaw cylinders that are bearing mounted to provide rotation. Pitch and roll motion is provided by a spherically annular shell that is air bearing mounted to move between a clamp and an upper pedestal bearing. The centers of curvature of the spherical surfaces of the shell lie upon the point. Pitch motion and roll motion are separately and independently imparted to mirror by a pair of pitch paddles and a pair of roll paddles that are independently and separately moved by control rods driven by motors. 5 figs.

Humpal, H.H.

1987-11-10T23:59:59.000Z

32

Evolution of the mirror machine  

SciTech Connect (OSTI)

The history of the magnetic-mirror approach to a fusion reactor is primarily the history of our understanding and control of several crucial physics issues, coupled with progress in the technology of heating and confining a reacting plasma. The basic requirement of an MHD-stable plasma equilibrium was achieved following the early introduction of minimum-B multipolar magnetic fields. In refined form, the same magnetic-well principle carries over to our present experiments and to reactor designs. The higher frequency microinstabilities, arising from the non-Maxwellian particle distributions inherent in mirror machines, have gradually come under control as theoretical prescriptions for distribution functions have been applied in the experiments. Even with stability, the classical plasma leakage through the mirrors posed a serious question for reactor viability until the principle of electrostatic axial stoppering was applied in the tandem mirror configuration. Experiments to test this principle successfully demonstrated the substantial improvement in confinement predicted. Concurrent with advances in mirror plasma physics, development of both high-power neutral beam injectors and high-speed vacuum pumping techniques has played a crucial role in ongoing experiments. Together with superconducting magnets, cryogenic pumping, and high-power radiofrequency heating, these technologies have evolved to a level that extrapolates readily to meet the requirements of a tandem mirror fusion reactor.

Damm, C. C.

1983-08-18T23:59:59.000Z

33

Yin Yang 1 Regulates the Expression of Snail through a Distal Enhancer  

Science Journals Connector (OSTI)

...edu Jeremy M. Boss 1 1 Department of Microbiology and Immunology, Emory University School...2000;2:84-9. 7 De Craene B, Gilbert B, Stove C, Bruyneel E, van Roy F...Snail 3' enhancer. | Department of Microbiology and Immunology, Emory University School...

Matthew B. Palmer; Parimal Majumder; John C. Cooper; Hyesuk Yoon; Paul A. Wade; and Jeremy M. Boss

2009-02-01T23:59:59.000Z

34

Real-Time GPU-Aided Lung Tumor Tracking Yin Yang, Zichun Zhong  

E-Print Network [OSTI]

computed tomography (CBCT) technique is not able to catch tumor motions due to the patient's respiration tumors in X-ray 2D projections, the raw data of CBCT scans. With the GPU-aided implementation computed tomography (CT) scan acquired before a course of therapy begins. Modern radiation ther- apy

Guo, Xiaohu "Tiger"

35

Technology for large tandem mirror experiments  

SciTech Connect (OSTI)

Construction of a large tandem mirror (MFTF-B) will soon begin at Lawrence Livermore National Laboratory (LLNL). Designed to reach break-even plasma conditions, the facility will significantly advance the physics and technology of magnetic-mirror-based fusion reactors. This paper describes the objectives and the design of the facility.

Thomassen, K.I.

1980-09-04T23:59:59.000Z

36

Alpha Channeling in Mirror Machines  

SciTech Connect (OSTI)

Because of their engineering simplicity, high-?, and steady-state operation, mirror machines and related open-trap machines such as gas dynamic traps, are an attractive concept for achieving controlled nuclear fusion. In these open-trap machines, the confinement occurs by means of magnetic mirroring, without the magnetic field lines closing upon themselves within the region of particle confinement. Unfortunately, these concepts have not achieved to date very spectacular laboratory results, and their reactor prospects are dimmed by the prospect of a low Q-factor, the ratio of fusion power produced to auxiliary power. Nonetheless, because of its engineering promise, over the years numerous improvements have been proposed to enhance the reactor prospects of mirror fusion, such as tandem designs, end-plugging, and electric potential barriers.

Fisch N.J.

2005-10-19T23:59:59.000Z

37

Effect of Si interlayers on the magnetic and mechanical properties of Fe/Ge neutron polarizing multilayer mirrors  

SciTech Connect (OSTI)

The neutron polarizing supermirror is one of the most important optical devices for polarizing neutron beams. To meet a variety of research demands, neutron polarizing supermirrors need to display high polarization efficiencies at low external magnetic fields. Fe/Si and Fe/Ge multilayers are typically used in neutron polarizing supermirrors because the contrast in scattering length densities almost vanishes for spin-down neutrons. The Fe/Si/Ge/Si multilayer, obtained by adding thin interlayers of Si to an Fe/Ge multilayer, is effective in reducing the external field strength necessary to achieve efficient neutron polarization. To gain insight into the mechanism that controls the required external field strength for a neutron polarizing supermirror, we investigated the magnetic and mechanical properties of Fe/Si, Fe/Ge, and Fe/Si/Ge/Si multilayers. The external field strength required to achieve efficient neutron polarization was found to be proportional to the compressive film stress. The compressive stress of the Fe/Si/Ge/Si multilayer was smaller by a factor of 4.4 and 2.7 than that of Fe/Si and Fe/Ge multilayers, respectively. These measurements and analyses showed that a reduction in the compressive film stress in the Fe/Si/Ge/Si multilayer permits the use of lower external field strength to achieve efficient neutron polarization. X-ray photoelectron spectroscopic studies showed that the formation of a Ge-Si solid solution in the Ge layer may explain the marked reduction in compressive stress in the case of the Fe/Si/Ge/Si multilayer. This study confirmed that a reduction in compressive film stress is very important for a high-performance neutron polarizing supermirror.

Maruyama, R.; Yamazaki, D.; Hayashida, H.; Soyama, K. [J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Okayasu, S. [Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Takeda, M. [J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Quantum Beam Science Directorate, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195 (Japan); Zettsu, N.; Nagano, M.; Yamamura, K. [Research Center for Ultra-precision Science and Technology, Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka 565-0871 (Japan)

2012-03-15T23:59:59.000Z

38

Photo of the Week: Inside the Tandem Mirror Experiment | Department of  

Broader source: Energy.gov (indexed) [DOE]

Inside the Tandem Mirror Experiment Inside the Tandem Mirror Experiment Photo of the Week: Inside the Tandem Mirror Experiment December 28, 2012 - 2:22pm Addthis This 1978 photo shows two workers inside the Mirror Fusion Test Facility, a magnetic confinement fusion device designed and built at Lawrence Livermore National Laboratory. In this experiment, magnetic mirrors are placed at both ends of a central magnetic tube. Very hot and dense plasmas inside each mirror enhanced the confinement of another plasma inside the central tube, where the bulk of the fusion would occur. | Photo courtesy of Lawrence Livermore National Laboratory. This 1978 photo shows two workers inside the Mirror Fusion Test Facility, a magnetic confinement fusion device designed and built at Lawrence Livermore National Laboratory. In this experiment, magnetic mirrors are placed at

39

More about neutron - mirror neutron oscillation  

E-Print Network [OSTI]

It was pointed out recently that oscillation of the neutron $n$ into mirror neutron $n'$, a sterile twin of the neutron with exactly the same mass, could be a very fast process with the the baryon number violation, even faster than the neutron decay itself. This process is sensitive to the magnetic fields and it could be observed by comparing the neutron lose rates in the UCN storage chambers for different magnetic backgrounds. We calculate the probability of $n-n'$ oscillation in the case when a mirror magnetic field $\\vec{B}'$ is non-zero and show that in this case it can be suppressed or resonantly enhanced by applying the ordinary magnetic field $\\vec{B}$, depending on its strength and on its orientation with respect to $\\vec{B}'$. The recent experimental data, under this hypothesis, still allow the $n-n'$ oscillation time order 1 s or even smaller. Moreover, they indicate that the neutron losses are sensitive to the orientation of the magnetic field. %at about $3\\sigma$ level. If these hints will be confirmed in the future experiments, this would point to the presence of the mirror magnetic field on the Earth of the order of 0.1 G, or some equivalent spin-dependent force of the other origin that makes a difference between the neutron and mirror neutron states.

Zurab Berezhiani

2008-04-13T23:59:59.000Z

40

Search for neutron - mirror neutron oscillations in a laboratory experiment with ultracold neutrons  

E-Print Network [OSTI]

Mirror matter is considered as a candidate for dark matter. In connection with this an experimental search for neutron - mirror neutron (nn') transitions has been carried out using storage of ultracold neutrons in a trap with different magnetic fields. As a result, a new limit for the neutron - mirror neutron oscillation time has been obtained, tau_osc >= 448 s (90% C.L.), assuming that there is no mirror magnetic field larger than 100 nT. Besides a first attempt to obtain some restriction for mirror magnetic field has been done.

A. P. Serebrov; E. B. Aleksandrov; N. A. Dovator; S. P. Dmitriev; A. K. Fomin; P. Geltenbort; A. G. Kharitonov; I. A. Krasnoschekova; M. S. Lasakov; A. N. Murashkin; G. E. Shmelev; V. E. Varlamov; A. V. Vassiljev; O. M. Zherebtsov; O. Zimmer

2008-09-29T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

National High Magnetic Field Laboratory: Superconductors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

opposes the magnetic field generating the current. In a perfect diamagnet, the magnetic field lines produced exactly mirror those of the changing magnetic field that induce them,...

42

Mirror Technology Roadmap  

Science Journals Connector (OSTI)

NASAs Mirror Technology Roadmap identifies specific capabilities requiring significant advances in optical fabrication and testing to enable the next generation of...

Stahl, H Philip

43

ESnet IPv6 Mirror Servers  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mirror Servers Engineering Services The Network OSCARS Fasterdata IPv6 Network IPv6 Implementation Checklist ESnet IPv6 Mirror Servers ESnet IPv6 History ESnet supports Sandia and...

44

Subcritical mirror structures in an anisotropic plasma  

E-Print Network [OSTI]

Based on Grad-Shafranov-like equations, a gyrotropic plasma where the pressures in the static regime are only functions of the amplitude of the local magnetic field is shown to be amenable to a variational principle with a free energy density given by the parallel tension. This approach is used to demonstrate that small- amplitude static holes constructed slightly below the mirror instability threshold identify with lump solitons of KPII equation and turn out to be unstable. It is also shown that regularizing effects such as finite Larmor radius corrections cannot be ignored in the description of large-amplitude mirror structures.

Kuznetsov, E A; Ruban, V P; Sulem, P L

2013-01-01T23:59:59.000Z

45

Tanden Mirror Reactor Systems Code (TMRSC)  

SciTech Connect (OSTI)

This paper describes a computer code developed to model a tandem mirror reactor. This is the first tandem mirror reactor model to couple the highly linked physics, magnetics, and neutronic analysis into a single code. Results from this code for two sensitivity studies are included in this paper. These studies are designed (1) to determine the impact of center cell plasma radius, length, and ion temperature on reactor cost and performance at constant fusion power and (2) to determine the impact of reactor power level on cost.

Reid, R.L.; Rothe, K.E.; Barrett, R.J.

1985-01-01T23:59:59.000Z

46

Nanolaminate deformable mirrors  

DOE Patents [OSTI]

A deformable mirror formed out of two layers of a nanolaminate foil attached to a stiff substrate is introduced. Deformation is provided by an electrostatic force between two of the layers. The internal stiffness of the structure allows for high-spatial-frequency shapes. The nanolaminate foil of the present invention allows for a high-quality mirror surface. The device achieves high precision in the vertical direction by using foils with accurately controlled thicknesses, but does not require high precision in the lateral dimensions, allowing such mirrors to be fabricated using crude lithography techniques. Such techniques allow structures up to about the meter scale to be fabricated.

Papavasiliou, Alexandros P. (Oakland, CA); Olivier, Scot S. (Santa Cruz, CA)

2009-04-14T23:59:59.000Z

47

Mirror Fusion Test Facility-B (MFTF-B) axicell configuration: NbTi magnet system. Design and analysis summary. Volume 1  

SciTech Connect (OSTI)

This report summarizes the designs and analyses produced by General Dynamics Convair for the four Axicell magnets (A1 and A20, east and west), the four Transition magnets (T1 and T2, east and west), and the twelve Solenoid magnets (S1 through S6, east and west). Over four million drawings and specifications, in addition to detailed stress analysis, thermal analysis, electrical, instrumentation, and verification test reports were produced as part of the MFTF-B design effort. Significant aspects of the designs, as well as key analysis results, are summarized in this report. In addition, drawing trees and lists off detailed analysis and test reports included in this report define the locations of the detailed design and analysis data.

Heathman, J.H.; Wohlwend, J.W.

1985-05-01T23:59:59.000Z

48

Coil system for a mirror-based hybrid reactor  

SciTech Connect (OSTI)

Two different superconducting coil systems for the SFLM Hybrid study - a quadrupolar mirror based fusion-fission reactor study - are presented. One coil system is for a magnetic field with 2 T at the midplane and a mirror ratio of four. This coil set consists of semiplanar coils in two layers. The alternative coil system is for a downscaled magnetic field of 1.25 T at the midplane and a mirror ratio of four, where a higher {beta} is required to achieve sufficient the neutron production. This coil set has one layer of twisted 3D coils. The 3D coils are expected to be considerably cheaper than the semiplanar, since NbTi superconductors can be used for most coils instead of Nb3Sn due to the lower magnetic field.

Hagnestal, A.; Agren, O.; Moiseenko, V. E. [Uppsala University, Angstroem laboratory, Division of Electricity, Box 534, SE-751 21 Uppsala (Sweden); Institute of Plasma Physics, National Science Center 'Kharkov Institute of Physics and Technology', Akademichna st. 1, 61108 Kharkiv (Ukraine)

2012-06-19T23:59:59.000Z

49

Applying Alpha-Channeling to Mirror Machines  

SciTech Connect (OSTI)

The ?-channeling effect entails the use of radio-frequency waves to expel and cool high-energetic ?- particles born in a fusion reactor; the device reactivity can then be increased even further by redirecting the extracted energy to fuel ions. Originally proposed for tokamaks, this technique has also been shown to benefi t open-ended fusion devices. Here, the fundamental theory and practical aspects of ?- channeling in mirror machines are reviewed, including the influence of magnetic field inhomogeneity and the effect of a finite wave region on the ?-channeling mechanism. For practical implementation of the ? -channeling effect in mirror geometry, suitable contained weakly-damped modes are identifi ed. In addition, the parameter space of candidate waves for implementing the ? -channeling effect can be signi cantly extended through the introduction of a suitable minority ion species that has the catalytic effect of moderating the transfer of power from the ?-channeling wave to the fuel ions.

A.I. Zhmoginov and N.J. Fisch

2012-03-16T23:59:59.000Z

50

Current results of the tandem mirror experiment  

SciTech Connect (OSTI)

The basic operating characteristics of the Tandem Mirror Experiment, (TMX) at the Lawrence Livermore Laboratory in the USA have been established. Tandem-mirror plasmas have been produced using neutral-beam-fueled end plugs and a gas-fueled center cell. An axial potential well between the end plugs has been measured. There is direct evidence that this potential well enhances the axial confinement of the center-cell ions. The observed densities and loss currents are consistent with preliminary studies of the particle sources and losses near the magnetic axis. The observed confinement is consistent with theory when plasma fluctuations are low. When the requirement of drift-cyclotron loss-cone mode stability is violated, the plasma fluctuations degrade the center-cell confinement.

Drake, R.P.

1980-04-09T23:59:59.000Z

51

Lithium-based electrochromic mirrors  

E-Print Network [OSTI]

LITHIUM-BASED ELECTROCHROMIC MIRRORS Thomas J. Richardson*with pure antimony films. Electrochromic cycling speed andand silver. INTRODUCTION Electrochromic devices that exhibit

Richardson, Thomas J.; Slack, Jonathan L.

2003-01-01T23:59:59.000Z

52

Plasma modeling of MFTF-B and the sensitivity to vacuum conditions  

SciTech Connect (OSTI)

The Mirror Fusion Test Facility (MFTF-B) is a large tandem mirror device currently under construction at Lawrence Livermore National Laboratory. The completed facility will consist of a large variety of components. Specifically, the vacuum vessel that houses the magnetic coils is basically a cylindrical vessel 60 m long and 11 m in diameter. The magnetics system consists of some 28 superconducting coils, each of which is located within the main vacuum vessel. Twenty of these coils are relatively simple solenoidal coils, but the remaining eight are of a more complicated design to provide an octupole component to certain regions of the magnetic field. The vacuum system is composed of a rough vacuum chain, used to evacuate the vessel from atmospheric pressure, and a high vacuum system, used to maintain good vacuum conditions during a plasma shot. High vacuum pumping is accomplished primarily by cryogenic panels cooled to 4.5/sup 0/K. The MFTF-B coil set is shown together with typical axial profiles of magnetic field (a), electrostatic potential (b), and plasma density (c). The plasma is divided into nine regions axially, as labelled on the coil set in Figure 1. The central cell, which is completely azimuthally symmetric, contains a large volume plasma that is confined by a combination of the magnetic fields and the electrostatic potentials in the yin-yang cell.

Porter, G.D.; Rensink, M.

1984-09-12T23:59:59.000Z

53

Science, Optics and You: Mirror and Images  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

opticstutorialsindex.html INTRODUCTION MIRRORS AND IMAGES MODULE m3 SCIENCE, OPTICS & YOU GUIDEBOOK - 44 - SCIENCE, OPTICS & YOU GUIDEBOOK - 45 - m3: Mirrors and...

54

Magnetic confinement of fusion plasmas  

Science Journals Connector (OSTI)

Starting with the Lorentz force law the basic physics involved in magnetic confinement in thermonuclear reactors is reviewed. Among the topics covered are magnetic bottles tokamaks tandem mirrors and energy balance considerations.(AIP)

George Patrick Lasche

1981-01-01T23:59:59.000Z

55

Magnetism  

Science Journals Connector (OSTI)

Historically, magnetism is related to rock magnetism, due to a few minerals exhibiting spontaneous magnetization. Attractive properties of magnetite were already known in Antiquity and were used for navigation...

Guillaume Morin

1998-01-01T23:59:59.000Z

56

Electrons and Mirror Symmetry  

SciTech Connect (OSTI)

The neutral weak force between an electron and a target particle, mediated by the Z boson, can be isolated by measuring the fractional change under a mirror reflection of the scattering probability of relativistic longitudinally polarized electrons off unpolarized targets. This technique yields neutral weak force measurements at a length scale of 1 femtometer, in contrast to high energy collider measurements that probe much smaller length scales. Study of the variation of the weak force over a range of length scales provides a stringent test of theory, complementing collider measurements. We describe a recent measurement of the neutral weak force between two electrons by the E158 experiment at the Stanford Linear Accelerator Center. While the weak force between an electron and positron has been extensively studied, that between two electrons had never directly been measured. We conclude by discussing prospects for even more precise measurements at future facilities.

Kumar, Krishna (University of Massachusetts, Amherst) [University of Massachusetts, Amherst

2007-04-04T23:59:59.000Z

57

magnetism  

Science Journals Connector (OSTI)

magnetism [A class of physical phenomena associated with moving electricity, including the mutual mechanical forces among magnets and electric currents] ? Magnetismus m

2014-08-01T23:59:59.000Z

58

ROSAT wide field camera mirrors  

Science Journals Connector (OSTI)

The ROSAT wide field camera (WFC) is an XUV telescope operating in the 12250-eV energy band. The mirror system utilizes Wolter-Schwarzschild type I (WS I) grazing incidence optics...

Willingale, R

1988-01-01T23:59:59.000Z

59

Plasma heating and hot ion sustaining in mirror based hybrids  

SciTech Connect (OSTI)

Possibilities of plasma heating and sloshing ion sustaining in mirror based hybrids are briefly reviewed. Sloshing ions, i.e. energetic ions with a velocity distribution concentrated to a certain pitch-angle, play an important role in plasma confinement and generation of fusion neutrons in mirror machines. Neutral beam injection (NBI) is first discussed as a method to generate sloshing ions. Numerical results of NBI modeling for a stellarator-mirror hybrid are analyzed. The sloshing ions could alternatively be sustained by RF heating. Fast wave heating schemes, i.e. magnetic beach, minority and second harmonic heating, are addressed and their similarities and differences are described. Characteristic features of wave propagation in mirror hybrid devices including both fundamental harmonic minority and second harmonic heating are examined. Minority heating is efficient for a wide range of minority concentration and plasma densities; it allows one to place the antenna aside from the hot ion location. A simple-design strap antenna suitable for this has good performance. However, this scenario is appropriate only for light minority ions. The second harmonic heating can be applied for the heavy ion component. Arrangements are similar for minority and second harmonic heating. The efficiency of second harmonic heating is influenced by a weaker wave damping than for minority heating. Numerical calculations show that in a hybrid reactor scaled mirror machine the deuterium sloshing ions could be heated within the minority heating scheme, while the tritium ions could be sustained by second harmonic heating.

Moiseenko, V. E.; Agren, O. [Institute of Plasma Physics, National Science Center 'Kharkiv Institute of Physics and Technology', Akademichna St. 1, 61108 Kharkiv (Ukraine); Uppsala University, Angstroem Laboratory, Division of Electricity, Box 534, SE-75121 Uppsala (Sweden)

2012-06-19T23:59:59.000Z

60

Firewalls, smoke and mirrors  

E-Print Network [OSTI]

The radiation emitted by a black hole (BH) during its evaporation has to have some degree of quantum coherence to accommodate a unitary time evolution. We parametrize the degree of coherence by the number of coherently emitted particles $N_{coh}$ and show that it is severely constrained by the equivalence principle. We discuss, in this context, the fate of a shell of matter that falls into a Schwarzschild BH. Two points of view are considered, that of a stationary external observer and that of the shell itself. From the perspective of the shell, the near-horizon region has an energy density proportional to $N_{coh}^2$ in Schwarzschild units. So, if $N_{coh}$ is parameterically larger than the square root of the BH entropy $S_{BH}^ {1/2}$, a firewall or more generally a "wall of smoke" forms and the equivalence principle is violated while the BH is still semiclassical. To have a degree of coherence that is parametrically smaller than $S_{BH}^{1/2}$, one has to introduce a new sub-Planckian gravitational length scale, which likely also violates the equivalence principle. And so our previously proposed model which has $N_{coh}=S_{BH}^{1/2}$ is singled out. From the external-observer perspective, we find that the time it takes for the information about the state of the shell to get re-emitted from the BH is inversely proportional to $N_{coh}$. When the rate of information release becomes order unity, the semiclassical approximation starts to break down and the BH becomes a perfect reflecting information mirror.

Ram Brustein; A. J. M. Medved

2014-01-07T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Magnetism  

Science Journals Connector (OSTI)

... dipoles in applied fields". It deals with the classical (Langevin) theory of para-magnetism, anisotropy fields and magnetic measurements. In the next chapter "Atomic structure" the author ... special relevance to ferrites and the inclusion of a quite lengthy discussion of Pauli para-magnetism and of Stoner's treatment of itinerant electron ferromagnetism, though it does much to ...

E. W. LEE

1972-03-31T23:59:59.000Z

62

Compact neutron imaging system using axisymmetric mirrors  

DOE Patents [OSTI]

A dispersed release of neutrons is generated from a source. A portion of this dispersed neutron release is reflected by surfaces of a plurality of nested, axisymmetric mirrors in at least an inner mirror layer and an outer mirror layer, wherein the neutrons reflected by the inner mirror layer are incident on at least one mirror surface of the inner mirror layer N times, wherein N is an integer, and wherein neutrons reflected by the outer mirror are incident on a plurality of mirror surfaces of the outer layer N+i times, where i is a positive integer, to redirect the neutrons toward a target. The mirrors can be formed by a periodically reversed pulsed-plating process.

Khaykovich, Boris; Moncton, David E; Gubarev, Mikhail V; Ramsey, Brian D; Engelhaupt, Darell E

2014-05-27T23:59:59.000Z

63

Mirror force induced wave dispersion in Alfvn waves  

SciTech Connect (OSTI)

Recent hybrid MHD-kinetic electron simulations of global scale standing shear Alfvn waves along the Earth's closed dipolar magnetic field lines show that the upward parallel current region within these waves saturates and broadens perpendicular to the ambient magnetic field and that this broadening increases with the electron temperature. Using resistive MHD simulations, with a parallel Ohm's law derived from the linear Knight relation (which expresses the current-voltage relationship along an auroral field line), we explore the nature of this broadening in the context of the increased perpendicular Poynting flux resulting from the increased parallel electric field associated with mirror force effects. This increased Poynting flux facilitates wave energy dispersion across field lines which in-turn allows for electron acceleration to carry the field aligned current on adjacent field lines. This mirror force driven dispersion can dominate over that associated with electron inertial effects for global scale waves.

Damiano, P. A.; Johnson, J. R. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)] [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543-0451 (United States)

2013-06-15T23:59:59.000Z

64

Parasitic driven heliostat mirror declinator  

SciTech Connect (OSTI)

An automatic parasitically driven declinator is disclosed for changing the tilt angle of the mirror of a heliostat to provide solar declination tracking by the heliostat. The declinator includes an axial gear drive train coupled to the polar axial shaft of the heliostat, which shaft is rotated. A pendulum arrangement coupled via an input shaft to the axial gear drive train is substantially held in plumb position by gravity wherein the gear drive train is driven as it is rotated about the polar axis by the polar axial shaft. An output shaft coupled to the gear train is rotated to drive a skew bar linkage assembly that is connected to the mirror mounting assembly of the heliostat. The gear ratio of the gear drive train assembly is made 365:1 so that the mirror angle is annually nutated a predetermined number of degrees corresponding to the cyclic variations of solar declination.

Rhodes, W.A.

1983-09-06T23:59:59.000Z

65

Compaction managed mirror bend achromat  

DOE Patents [OSTI]

A method for controlling the momentum compaction in a beam of charged particles. The method includes a compaction-managed mirror bend achromat (CMMBA) that provides a beamline design that retains the large momentum acceptance of a conventional mirror bend achromat. The CMMBA also provides the ability to tailor the system momentum compaction spectrum as desired for specific applications. The CMMBA enables magnetostatic management of the longitudinal phase space in Energy Recovery Linacs (ERLs) thereby alleviating the need for harmonic linearization of the RF waveform.

Douglas, David (Yorktown, VA)

2005-10-18T23:59:59.000Z

66

Magnetism  

Science Journals Connector (OSTI)

... THIS is a good book, and we are glad to see the subject of magnetism fully treated in a popularly written text-book. It is a second edition of ... of importance, accuracy, and exhaustiveness, places the present treatise, as far as terrestrial magnetism is concerned, much before any similar book with which we are acquainted. The correction ...

JAMES STUART

1872-03-07T23:59:59.000Z

67

CubeSat deformable mirror demonstration  

E-Print Network [OSTI]

The goal of the CubeSat Deformable Mirror Demonstration (DeMi) is to characterize the performance of a small deformable mirror over a year in low-Earth orbit. Small form factor deformable mirrors are a key technology needed ...

Cahoy, Kerri

68

Steady mirror structures in a plasma with pressure anisotropy  

E-Print Network [OSTI]

In the first part we present a review of our results concerning the weakly nonlinear regime of the mirror instability in the framework of an asymptotic model. This model belongs to the class of gradient type systems for which the free energy can only decrease in time. It reveals a behavior typical for subcritical bifurcations: below the mirror instability threshold, all localized stationary structures are unstable, while above threshold, the system displays a blow-up behavior. It is shown that taking the electrons into account (non-zero temperature) does not change the structure of the asymptotic model. For bi-Maxwellian distribution functions for both electrons and ions, the model predicts the formation of magnetic holes. The second part contains original results concerning two-dimensional steady mirror structures which can form in the saturated regime. Based on Grad-Shafranov-like equations, a gyrotropic plasma, where the pressures in the static regime are only functions of the amplitude of the local magnet...

Kuznetsov, E A; Ruban, V P; Sulem, P L

2015-01-01T23:59:59.000Z

69

The Gasdynamic Mirror Fusion Propulsion System -- Revisited  

SciTech Connect (OSTI)

Many of the previous studies assessing the capability of the gasdynamic mirror (GDM) fusion propulsion system employed analyses that ignored the 'ambipolar' potential. This electrostatic potential arises as a result of the rapid escape of the electrons due to their small mass. As they escape, they leave behind an excess positive charge which manifests itself in an electric field that slows down the electrons while speeding up the ions until their respective axial diffusions are equalized. The indirect effect on the ions is that their confinement time is reduced relative to that of zero potential, and hence the plasma length must be increased to accommodate that change. But as they emerge from the thruster mirror - which serves as a magnetic nozzle - the ions acquire an added energy equal to that of the potential energy, and that in turn manifests itself in increased specific impulse and thrust. We assess the propulsive performance of the GDM thruster, based on the more rigorous theory, by applying it to a round trip Mars mission employing a continuous burn acceleration/deceleration type of trajectory. We find that the length of the device and travel time decrease with increasing plasma density, while the total vehicle mass reaches a minimum at a plasma density of 3 x 1016 cm-3. At such a density, and an initial DT ion temperature of 10 keV, a travel time of 60 days is found to be achievable at GDM propulsion parameters of about 200,000 seconds of specific impulse and approximately 47 kN of thrust.

Kammash, Terry [Department of Nuclear Engineering and Radiological Sciences, University of Michigan, 2355 Bonisteel Blvd, Ann Arbor, MI 48109 (United States); Tang, Ricky [Department of Aerospace Engineering, University Michigan, 1320 Beal Ave, Ann Arbor, MI 48109 (United States)

2005-02-06T23:59:59.000Z

70

LITHIUM-BASED ELECTROCHROMIC MIRRORS  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

870 870 rd Presented at the 203 Meeting of the Electrochemical Society, April 28-30, 2003 in Paris, France and published in the Proceedings. Lithium-Based Electrochromic Mirrors Thomas J. Richardson and Jonathan L. Slack Lawrence Berkeley National Laboratory April 2003 This work was supported by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Building Technology, State and Community Programs, Office of Building Research and Standards of the U.S. Department of Energy under Contract No. DE-AC03-76SF00098. LITHIUM-BASED ELECTROCHROMIC MIRRORS Thomas J. Richardson* and Jonathan L. Slack Building Technologies Department Environmental Energy Technologies Division Lawrence Berkeley National Laboratory Berkeley, California 94720, USA

71

Fusion neutron generation computations in a stellarator-mirror hybrid with neutral beam injection  

SciTech Connect (OSTI)

In the paper [Moiseenko V.E., Noack K., Agren O. 'Stellarator-mirror based fusion driven fission reactor' J Fusion Energy 29 (2010) 65.], a version of a fusion driven system (FDS), i.e. a sub-critical fast fission assembly with a fusion plasma neutron source, is proposed. The plasma part of the reactor is based on a stellarator with a small mirror part. Hot ions with high perpendicular energy are assumed to be trapped in the magnetic mirror part. The stellarator part which connects to the mirror part and provides confinement for the bulk (deuterium) plasma. In the magnetic well of the mirror part, fusion reactions occur from collisions between a of hot ion component (tritium) with cold background plasma ions. RF heating is one option to heat the tritium. A more conventional method to sustain the hot ions is neutral beam injection (NBI), which is here studied numerically for the above-mentioned hybrid scheme. For these studies, a new kinetic code, KNBIM, has been developed. The code takes into account Coulomb collisions between the hot ions and the background plasma. The geometry of the confining magnetic field is arbitrary for the code. It is accounted for via a numerical bounce averaging procedure. Along with the kinetic calculations the neutron generation intensity and its spatial distribution are computed.

Moiseenko, V. E.; Agren, O. [Institute of Plasma Physics, National Science Center 'Kharkiv Institute of Physics and Technology', Akademichna St. 1, 61108 Kharkiv (Ukraine); Uppsala University, Angstroem Laboratory, Division of Electricity, Box 534, SE-7512 Uppsala (Sweden)

2012-06-19T23:59:59.000Z

72

magnets  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

I I Painless Physics Articles BEAM COOLING August 2, 1996 By Leila Belkora, Office of Public Affairs ACCELERATION August 16, 1996 By Dave Finley, Accelerator Division Head RF August 30, 1996 By Pat Colestock, Accelerator Division FIXED TARGET PHYSICS September 20, 1996 By Peter H. Garbincius, Physics Section FIXED TARGET PHYSICS PART DEUX October 16, 1996 By Peter H. Garbincius, Physics Section and Leila Belkora, Office of Public Affaris CROSS SECTION November 1, 1996 By Doreen Wackeroth, Theoretical Physics Edited by Leila Belkora, Office of Public Affaris MAGNETS PART I November 15, 1996 By Hank Glass, Technical Support Section Edited by Donald Sena, Office of Public Affairs MAGNETS PART II January 10, 1997 By Hank Glass, Technical Support Section Edited by Donald Sena, Office of Public Affairs

73

Deformable mirror for short wavelength applications  

DOE Patents [OSTI]

A deformable mirror compatible with short wavelength (extreme ultraviolet) radiation that can be precisely controlled to nanometer and subnanometer accuracy is described. Actuators are coupled between a reaction plate and a face plate which has a reflective coating. A control system adjusts the voltage supplied to the actuators; by coordinating the voltages supplied to the actuators, the reflective surface of the mirror can be deformed to correct for dimensional errors in the mirror or to produce a desired contour.

Chapman, Henry N. (2417 Kilkare Rd., Sunol, CA 94586); Sweeney, Donald W. (5020 Canyon Crest Dr., San Ramon, CA 94583)

1999-01-01T23:59:59.000Z

74

Cryogenic wavefront correction using membrane deformable mirrors  

Science Journals Connector (OSTI)

Micro-machined membrane deformable mirrors (MMDMs) are being evaluated for their suitability as wavefront correctors at cryogenic temperatures. Presented here are experimental...

Dyson, Harold; Sharples, Ray; Dipper, N; Vdovin, Gleb

2001-01-01T23:59:59.000Z

75

Miniature Kinematic Mirror Mount for UHV Service  

Science Journals Connector (OSTI)

A miniature kinematic mount allows adjustment of mirror pointing inside ultrahigh vacuum (UHV) by rotating finely threaded screws outside of vacuum. The mount assembly is less than...

Havstad, Mark A; McLean, William; Lewis, Rebecca C

1995-01-01T23:59:59.000Z

76

POLYMERIC MIRROR FILMS: DURABILITY IMPROVEMENT AND IMPLEMENTATION...  

Broader source: Energy.gov (indexed) [DOE]

Impact Test Methods Corrosion Coating failure Edge sealing failure Mirror graying Loss of reflectivity Damp heat Outdoor exposure Abrasion Installation Windborne sand Low...

77

A helium-film-coated quasi-parabolic mirror to focus a beam of ultra-cold spin-polarized atomic hydrogen  

SciTech Connect (OSTI)

A 350 mK helium-4 coated mirror was used to increase the intensity of an ultra-cold electron-spin-polarized atomic hydrogen beam. The mirror uses the observed specular reflection of atomic hydrogen from a superfluid-helium-covered surface. A quasi-parabolic polished copper mirror was installed with its focus at the 5 mm diameter exit aperture of an atomic hydrogen stabilization cell in the gradient of an 8 T solenoid. The four-coned mirror shape, which was designed specifically for operation in the gradient, increased the beam intensity focused by a sextupole magnet into a compression tube detector more than seven-fold.

Luppov, V.G.; Kaufman, W.A.; Hill, K.M. [and others

1993-04-01T23:59:59.000Z

78

Wave-particle Interactions In Rotating Mirrors  

SciTech Connect (OSTI)

Wave-particle interactions in EB rotating plasmas feature an unusual effect: particles are diffused by waves in both potential energy and kinetic energy. This wave-particle interaction generalizes the alpha channeling effect, in which radio frequency waves are used to remove alpha particles collisionlessly at low energy. In rotating plasmas, the alpha particles may be removed at low energy through the loss cone, and the energy lost may be transferred to the radial electric field. This eliminates the need for electrodes in the mirror throat, which have presented serious technical issues in past rotating plasma devices. A particularly simple way to achieve this effect is to use a high azimuthal mode number perturbation on the magnetic field. Rotation can also be sustained by waves in plasmas without a kinetic energy source. This type of wave has been considered for plasma centrifuges used for isotope separation. Energy may also be transferred from the electric field to particles or waves, which may be useful for ion heating and energy generation.

Abraham J. Fetterman and Nathaniel J. Fisch

2011-01-11T23:59:59.000Z

79

Analysis of tandem mirror reactor performance  

SciTech Connect (OSTI)

Parametric studies are performed using a tandem mirror plasma point model to evaluate the wall loading GAMMA and the physics figure of merit, Q (fusion power/injected power). We explore the relationship among several dominant parameters and determine the impact on the plasma performance of electron cyclotron resonance heating in the plug region. These global particle and energy balance studies were carried out under the constraints of magnetohydrodynamic (MHD) equilibrium and stability and constant magnetic flux, assuming a fixed end-cell geometry. We found that the higher the choke coil fields, the higher the Q, wall loading, and fusion power due to the combination of the increased central-cell field B/sub c/ and density n/sub c/ and the reduced central-cell beta ..beta../sub c/. The MHD stability requirement of constant B/sub c//sup 2/..beta../sub c/ causes the reduction in ..beta../sub c/. In addition, a higher value of fusion power can also be obtained, at a fixed central-cell length, by operating at a lower value of B/sub c/ and a higher value of ..beta../sub c/.

Wu, K.F.; Campbell, R.B.; Peng, Y.K.M.

1984-11-01T23:59:59.000Z

80

Plasma debris sputter resistant x-ray mirror  

Science Journals Connector (OSTI)

A diamond-like carbon (DLC) mirror, used as a grazing incident mirror in a plasma x-ray source, exhibits a high resistance to plasma debris sputtering. Good mirror reflectivity at a...

Amano, Sho; Inoue, Tomoaki; Harada, Tetsuo

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Cryogenic optical testing of sandwich-type silicon carbide mirrors  

Science Journals Connector (OSTI)

The experimental cryogenic performance of 160-mm-diameter silicon carbide (SiC) mirrors, one of which, a 700-mm-diameter mirror, is to be used as a primary mirror of the Japanese...

Kaneda, Hidehiro; Onaka, Takashi; Kawada, Mitsunobu; Murakami, Hiroshi

2003-01-01T23:59:59.000Z

82

Philosophy and the Mirror of Nature  

E-Print Network [OSTI]

Philosophy and the Mirror of Nature Richard Rorty Philosophy and the Mir- ror of Nature hit has since gone on to be- come one of its all-time best-sellers in philosophy. Rorty argued that, repairing, and polishing the mirror-- belongs to philosophy. Rorty's book was a powerful critique

Landweber, Laura

83

LED structure with enhanced mirror reflectivity  

DOE Patents [OSTI]

Embodiments of the present invention are generally related to LED chips having improved overall emission by reducing the light-absorbing effects of barrier layers adjacent mirror contacts. In one embodiment, a LED chip comprises one or more LEDs, with each LED having an active region, a first contact under the active region having a highly reflective mirror, and a barrier layer adjacent the mirror. The barrier layer is smaller than the mirror such that it does not extend beyond the periphery of the mirror. In another possible embodiment, an insulator is further provided, with the insulator adjacent the barrier layer and adjacent portions of the mirror not contacted by the active region or by the barrier layer. In yet another embodiment, a second contact is provided on the active region. In a further embodiment, the barrier layer is smaller than the mirror such that the periphery of the mirror is at least 40% free of the barrier layer, and the second contact is below the first contact and accessible from the bottom of the chip.

Bergmann, Michael; Donofrio, Matthew; Heikman, Sten; Schneider, Kevin S; Haberern, Kevin W; Edmond, John A

2014-04-01T23:59:59.000Z

84

Production of field-reversed mirror plasma with a coaxial plasma gun  

DOE Patents [OSTI]

The use of a coaxial plasma gun to produce a plasma ring which is directed into a magnetic field so as to form a field-reversed plasma confined in a magnetic mirror. Plasma thus produced may be used as a target for subsequent neutral beam injection or other similarly produced and projected plasma rings or for direct fusion energy release in a pulsed mode.

Hartman, Charles W. (Alamo, CA); Shearer, James W. (Livermore, CA)

1982-01-01T23:59:59.000Z

85

Ra: A high efficiency, D-/sup 3/He, tandem mirror fusion reactor: Appendix C  

SciTech Connect (OSTI)

The Ra tandem mirror fusion reactor concept features inherent safety, high net plant efficiency, low cost of electricity, low radioactive waste generation, low activation, highly efficient direct conversion, thin radiation shields, and axisymmetric magnets. The safety and environmental features are achieved through the use of D/He-3 fuel, while the high efficiency derives from a new operating mode. ICRF stabilization allows an axisymmetric magnet set. 11 refs., 5 figs., 3 tabs.

Santarius, J.F.; Attaya, H.; Corradini, M.L.; El-Guebaly, L.A.; Emmert, G.A.; Kulcinski, G.L.; Larsen, E.M.; Maynard, C.W.; Musicki, Z.; Sawan, M.E.

1987-01-01T23:59:59.000Z

86

Concentrating Solar Power: Energy from Mirrors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mirror mirror on the wall, what's the Mirror mirror on the wall, what's the greatest energy source of all? The sun. Enough energy from the sun falls on the Earth everyday to power our homes and businesses for almost 30 years. Yet we've only just begun to tap its potential. You may have heard about solar electric power to light homes or solar thermal power used to heat water, but did you know there is such a thing as solar thermal-electric power? Electric utility companies are using mirrors to concentrate heat from the sun to produce environmentally friendly electricity for cities, especially in the southwestern United States. The southwestern United States is focus- ing on concentrating solar energy because it's one of the world's best areas for sun- light. The Southwest receives up to twice the sunlight as other regions in the coun-

87

Magnetic field dissipation in converging flows  

Science Journals Connector (OSTI)

......spatial distribution that mirrors that of the gas. This...i.e., several Schwarzschild radii) where the magnetic...turbulent distribution that mirrors that of the gas...radius of about 20 Schwarzschild radii. Our treatment...region, as far as 105 Schwarzschild radii, where the compact......

Fulvio Melia; Victor Kowalenko

2001-11-11T23:59:59.000Z

88

Deformable Mirror Materials Issue Assessment  

SciTech Connect (OSTI)

It was a pleasure to speak with you and Dr. Olivier Guyon about your project to develop a coronagraph and in particular about materials science considerations in the development of the deformable mirror (DM) for the coronagraph. The coronagraph application will demand more of a DM than previous applications with regard to precision, and since the characterization and modeling tools are currently under development, you asked me to comment on materials issues that might impact the DM design and testing. I have not conducted research on this question, and my own research on modeling MEMS has not included DM systems. I am only in a position to discuss some general considerations that may help in developing a research plan for the DM system. As I understand it, the relevant points about the DM system are as follows. The DM surface needs to be positioned to less than 1 {angstrom} RMS of the desired shape, and be stable to 0.3 {angstrom} RMS for an hour. In the ultimate application in space the stability requirements may be greater. For example, the DM shape can be set using a bright star and then allow the coronagraph to be turned to a dim star to collect data for several hours, counting on the mirror shape to be stable. The DM is made of a polysilicon membrane coated with one or more metal layers for the reflective surface and actuated by 32x32 or 64x64 electrostatic actuators on the back side. The uncertainty in the position of any one actuator should be at the few-picometer level or less averaged over the 300-{micro}m region of the actuator. Currently, experiments are conducted that can characterize the surface shape to the 1 nm level, and it is anticipated that the experiments will be able to characterize the shape at the sub-Angstrom level but not in the immediate future. Regarding stability, under relatively large deformations (10's of nm), the DM mirror surface shows no hysteresis at the measurable nm level. Let me begin by saying that I am not aware of any article in the literature that directly assesses surface position stability at the sub-Angstrom level across 100's of microns of surface. Interferometry is typically used for precise metrology over areas this large, but not typically at the sub-Angstrom level. For the purpose of these comments, I assume that it will be possible to measure the precision of the mirror shape and stability at the requisite sub-Angstrom level at some point during the coronagraph development using interferometers or some other high-precision metrology technique. The hope is that the comments at this point may identify some potential issues that can be resolved early in the development to avoid costly surprises in the later stages.

Rudd, R E

2008-05-27T23:59:59.000Z

89

Construction and operational experience of the Tandem Mirror Experiment-Upgrade (TMX-U)  

SciTech Connect (OSTI)

The Tandem Mirror Experiment-Upgrade (TMX-U) incorporates two new features at Lawrence Livermore National Laboratory (LLNL) tandem mirror program, thermal barriers in the end plugs and injection of the neutral beams at several oblique angles. The thermal barriers isolate the electrons in the end plugs from those in the central cell, making it possible to heat them independently with microwaves. In addition, this innovation produces a large potential gradient in the end plugs with lower magnetic fields and lower neutral-beam energies than would be possible in a conventional tandem mirror device. The TMX-U is also designed to test neutral-beam-injection angles as an experimental parameter. We use angles other than 90/sup 0/ to produce a plasma with improved microstability.

Chargin, A.K.; Calderon, M.O.; Moore, T.L.

1983-07-01T23:59:59.000Z

90

Lenses and Mirrors for Solar Energy  

Science Journals Connector (OSTI)

When the design simulation of the nonimaging Fresnel lens solar concentrator was completed, we thought of the lens as being a direct competitor to the compound parabolic concentrator (CPC), which is a mirror-b...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

91

Two-mirror Schwarzschild aplanats: Basic relations  

Science Journals Connector (OSTI)

The theory of aplanatic two-mirror telescopes developed by Karl Schwarzschild in 1905 is shown to lead to ... extended to ascertain the image quality in exact Schwarzschild aplanats. A comparison of Schwarzschild

V. Yu. Terebizh

2005-02-01T23:59:59.000Z

92

Mirror Advanced Reactor Study interim design report  

SciTech Connect (OSTI)

The status of the design of a tenth-of-a-kind commercial tandem-mirror fusion reactor is described at the midpoint of a two-year study. When completed, the design is to serve as a strategic goal for the mirror fusion program. The main objectives of the Mirror Advanced Reactor Study (MARS) are: (1) to design an attractive tandem-mirror fusion reactor producing electricity and synfuels (in alternate versions), (2) to identify key development and technology needs, and (3) to exploit the potential of fusion for safety, low activation, and simple disposal of radioactive waste. In the first year we have emphasized physics and engineering of the central cell and physics of the end cell. Design optimization and trade studies are continuing, and we expect additional modifications in the end cells to further improve the performance of the final design.

Not Available

1983-04-01T23:59:59.000Z

93

Neutron diagnostics for mirror hybrids  

SciTech Connect (OSTI)

Fusion-fission (FuFi) hybrids will need instrumentation to diagnose the deuteriumtritium plasma, whose 14-MeV neutron emission is the driver of the sub-critical fission core. While the fission neutron yield rate (Y{sub fi} and hence power P{sub fi}) can be monitored with standard instrumentation, fusion plasmas in hybrids require special diagnostics where the determination of Y{sub th} ({proportional_to}P{sub fu}) is a challenge. Information on Y{sub fu} is essential for assessing the fusion plasma performance which together with Y{sub fi} allows for the validation of the neutron multiplication factor (k) of the subcritical fission core. Diagnostics for hybrid plasmas are heuristically discussed with special reference to straight field line mirror (SFLM). Relevant DT plasma experience from JET and plans for ITER in the main line of fusion research were used as input. It is shown that essential SFLM plasma information can potentially be obtained with proposed instrumentation, but the state of the hybrid plasma must be predictably robust as derived from fully diagnosed dedicated experiments without interface restrictions of the hybrid application.

Kaellne, Jan; Noack, Klaus; Agren, Olov; Gorini, Giuseppe; Tardocchi, Marco; Grosso, Giovanni [Department of Engineering Sciences, Uppsala University, Box 256, SE-751 21 Uppsala (Sweden); Universita degli Studi di Milano - Bicocca, Dip. di Fisica 'G. Occhialini', Piazza della Scienza 3, 20126, Milan (Italy)

2012-06-19T23:59:59.000Z

94

The mirror effect: Virginia Woolf's war writings  

E-Print Network [OSTI]

THE MIRROR EFFECT: VIRGINIA WOOLF'S WAR WRITINGS A Semor Honors Thesis By MARCIA WILKENS MURCHISON Submitted to the Office of Honors Programs & Academic Scholarships Texas A&M University In partial fulfillment of the requirements... of the UNIVERSITY UNDERGRADUATE RESEARCH FELLOWS April 2000 Group: Humanities THE MIRROR EFFECT: VIRGINIA WOOLF'S WAR WRITINGS A Senior Honors Thesis By MARCIA WILKENS MURCHISON Submitted to the Office of Honors Programs & Academic Scholarships Texas Ak...

Murchison, Marcia Wilkens

2013-02-22T23:59:59.000Z

95

Motorized control for mirror mount apparatus  

DOE Patents [OSTI]

A motorized control and automatic braking system for adjusting mirror mount apparatus is disclosed. The motor control includes a planetary gear arrangement to provide improved pitch adjustment capability while permitting a small packaged design. The motor control for mirror mount adjustment is suitable for laser beam propagation applications. The brake is a system of constant contact, floating detents which engage the planetary gear at selected between-teeth increments to stop rotation instantaneously when the drive motor stops.

Cutburth, Ronald W. (Tracy, CA)

1989-01-01T23:59:59.000Z

96

A helium film coated quasi-parabolic mirror to focus a beam of ultra-cold spin polarized atomic hydrogen  

SciTech Connect (OSTI)

A 350 mK helium-4-coated mirror was used to increase the intensity of an ultra-cold electron-spin-polarized atomic hydrogen beam. The mirror uses the observed specular reflection of atomic hydrogen from a superfluid-helium-covered surface. A quasi-parabolic polished copper mirror was installed with its focus at the 5 mm diameter exit aperture of an atomic hydrogen stabilization cell in the gradient of an 8 T solenoid field. The four-coned mirror shape, which was designed specifically for operation in the gradient, increased the beam intensity focused by a sextupole magnet into a compression tube detector by a factor of about 7.5.

Luppov, V.G.; Kaufman, W.A.; Hill, K.M.; Raymond, R.S.; Kirsch, A.D. (Randall Laboratory, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States))

1993-12-05T23:59:59.000Z

97

Permanent Magnet Ecr Plasma Source With Magnetic Field Optimization  

DOE Patents [OSTI]

In a plasma-producing device, an optimized magnet field for electron cyclotron resonance plasma generation is provided by a shaped pole piece. The shaped pole piece adjusts spacing between the magnet and the resonance zone, creates a convex or concave resonance zone, and decreases stray fields between the resonance zone and the workpiece. For a cylindrical permanent magnet, the pole piece includes a disk adjacent the magnet together with an annular cylindrical sidewall structure axially aligned with the magnet and extending from the base around the permanent magnet. The pole piece directs magnetic field lines into the resonance zone, moving the resonance zone further from the face of the magnet. Additional permanent magnets or magnet arrays may be utilized to control field contours on a local scale. Rather than a permeable material, the sidewall structure may be composed of an annular cylindrical magnetic material having a polarity opposite that of the permanent magnet, creating convex regions in the resonance zone. An annular disk-shaped recurve section at the end of the sidewall structure forms magnetic mirrors keeping the plasma off the pole piece. A recurve section composed of magnetic material having a radial polarity forms convex regions and/or magnetic mirrors within the resonance zone.

Doughty, Frank C. (Plano, TX); Spencer, John E. (Plano, TX)

2000-12-19T23:59:59.000Z

98

Coordinate noncommutativity in strong non-uniform magnetic fields  

E-Print Network [OSTI]

Noncommuting spatial coordinates are studied in the context of a charged particle moving in a strong non-uniform magnetic field. We derive a relation involving the commutators of the coordinates, which generalizes the one realized in a strong constant magnetic field. As an application, we discuss the noncommutativity in the magnetic field present in a magnetic mirror.

J. Frenkel; S. H. Pereira

2004-09-23T23:59:59.000Z

99

Mirror-based hybrids of recent design  

Science Journals Connector (OSTI)

Early application of the simple axisymmetric mirror requiring intermediate performance between a neutron source for materials testing Q=Pfusion/Pinput ?0.05 and pure fusion Q>10 are the hybrid applications. The Axisymmetric Mirror has attractive features as a driver for a fusion-fission hybrid system: geometrical simplicity as well as the typical mirror features of inherently steady-state operation and natural divertors in the form of end tanks. Operation at Q?0.7 allows for relatively low electron temperatures in the range of 3 keV for the DT injection energy ? 80 keV from existing positive ion neutral beams designed for steady state. This level of physics performance has the virtue of being low risk with only modest R&D needed; and its simplicity promises economy advantages. A simple mirror with the plasma diameter of 1 m and mirror-to-mirror 2.5 T solenoid length of 40 m is discussed. Simple circular steady state superconducting coils at each end are based on 15 T technology development of the ITER central solenoid. Hybrids obtain important revenues from the sale of both electricity and fuel production or waste burning. Burning fission reactor wastes by fissioning transuranics in the hybrid will multiply fusion's neutron energy by a factor of ?10 or more and diminish the Q needed to overcome the cost of recirculating power for good economics to less than 2 and for minor actinides with multiplication over 50 to Q?0.2. Hybrids that produce fissile fuel with fissioning blankets might need Q4.

Dimitri Ryutov

2012-01-01T23:59:59.000Z

100

Suppression of local heat flux in a turbulent magnetized intracluster medium  

Science Journals Connector (OSTI)

......Institute for Astrophysics, Karl-Schwarzschild-Strasse 1, D-85741 Garching...strong magnetic field (magnetic mirrors; see Chandran Cowley 1998; Chandran...conduction modifies the classical Schwarzschild stability criterion in such a......

S. V. Komarov; E. M. Churazov; A. A. Schekochihin; J. A. ZuHone

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Tandem-mirror program: status and projection  

SciTech Connect (OSTI)

Construction of MFTF-B is scheduled for completion in 1985. Results of experiments in TMX-U and MFTF-B will permit the design of the D-T burning tandem-mirror next-step facility (TMNS) in which physics issues will not be at issue. TMNS will be a facility for engineering research and development. The end cells of TMNS are expected to be appropriate for a tandem-mirror demonstration fusion reactor (TMR), construction of which should begin about 1986 for operation in the 1990's.

Van Atta, C.M.

1981-03-12T23:59:59.000Z

102

Plasma confinement in the TMX tandem mirror  

SciTech Connect (OSTI)

Plasma confinement in the Tandem Mirror Experiment (TMX) is described. Axially confining potentials are shown to exist throughout the central 20-cm core of TMX. Axial electron-confinement time is up to 100 times that of single-cell mirror machines. Radial transport of ions is smaller than axial transport near the axis. It has two parts at large radii: nonambipolar, in rough agreement with predictions from resonant-neoclassical transport theory, and ambipolar, observed near the plasma edge under certain conditions, accompanied by a low-frequency, m = 1 instability or strong turbulence.

Hooper, E.B. Jr.; Allen, S.L.; Casper, T.A.

1981-04-29T23:59:59.000Z

103

Finite beta plasma equilibrium in toroidally linked mirrors  

SciTech Connect (OSTI)

The problem of finite pressure plasma equilibrium in a system with closed magnetic field lines consisting of quadrupole mirrors linked by simple toroidal cells with elliptical cross-sections is analyzed. An appropriate analytical procedure is developed, that uses conformal mapping techniques, which enables one to obtain the magnetic field structure for the free boundary equilibrium problem. This method has general applicability for finding analytic solutions of the two-dimensional Dirichlet problem outside of an arbitrary closed contour. Using this method, the deformations of the plasma equilibrium configuration due to finite plasma pressure in the toroidal cell are calculated analytically to the second order in {lambda}-expansion, where {lambda} {approximately} {beta}/{epsilon}E, {beta} is the ratio of plasma pressure to the magnetic field pressure, {epsilon} is the inverse aspect ratio and E is the ellipticity of the plasma cross-section. The outer displacement of the plasma column is shown to depend nonlinearly on the increase of plasma pressure, and does not prevent the achievement of substantial {beta} {approximately} 10% in the toroidal cells.

Ilgisonis, V.I.; Berk, H.L.; Pastukhov, V.P.

1993-07-01T23:59:59.000Z

104

Minimizing high spatial frequency residual in active space telescope mirrors  

E-Print Network [OSTI]

The trend in future space telescopes is towards large apertures and lightweight, rib-stiffened, and actively controlled deformable mirrors. These mirror architectures permit the development of segmented and deployed primary ...

Gray, Thomas, S.M. (Thomas L.) Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

105

Flat plate solar collector with a cantilevered mirror  

SciTech Connect (OSTI)

The use of flat booster mirrors with flat plate collectors provides moderate solar flux concentration and enhanced performance especially when the mirrors are seasonally adjusted. Curved mirrors provide higher flux concentration and a practical system has been developed where the booster mirror is bent elastically. The system employs a single cantilever mirror which is located below a conventional flat plate collector. The mirror is clamped at the base of the collector panel and its free end is deflected upward; a smaller deflection is used in the fall and winter than in the spring and summer. The prototype system consists of a 0.9 by 2.5 m collector panel mounted on its side (horizontal fluid flow) and a 2.7 by 2.5 m elastic mirror. The mirror is made with aluminum sheet with an adherent aluminized acrylic film. The system has been designed for mounting on horizontal surfaces at latitudes of 10 to 50/sup 0/.

Cohen, S.; Larson, D.C.

1981-01-01T23:59:59.000Z

106

Control of a MEMS fast steering mirror for laser applications  

E-Print Network [OSTI]

A control system for a MEMS fast steering mirror is designed and implemented to accurately steer a laser beam. This document contains a characterization of important mirror characteristics and the full analysis of an analog ...

Lane, Joseph Kerivan

2012-01-01T23:59:59.000Z

107

An Advanced Fast Steering Mirror for optical communication  

E-Print Network [OSTI]

I describe in this thesis the design, fabrication, assembly, and testing of an Advanced Fast Steering Mirror (AFSM) for precision optical platforms. The AFSM consists of a mirror driven in two rotational axes by normal ...

Kluk, Daniel Joseph

2007-01-01T23:59:59.000Z

108

Novel neutron focusing mirrors for compact neutron sources  

E-Print Network [OSTI]

We demonstrated neutron beam focusing and neutron imaging using axisymmetric optics, based on pairs of confocal ellipsoid and hyperboloid mirrors. Such systems, known as Wolter mirrors, are commonly used in x-ray telescopes. ...

Gubarev, M.V.

109

Three-Mirror Anastigmat Telescope with an Unvignetted Flat Focal Plane  

Science Journals Connector (OSTI)

......anastigmat with a two-mirror system except for some special cases (Schwarzschild 1905; Burch 1947). 3. Three-Mirror System In our three-mirror...Academic Press). Schwarzschild K. 1905, Investigations...Optics II, Theory of Mirror Telescopes, English......

Kyoji Nariai; Masanori Iye

2005-04-25T23:59:59.000Z

110

Solid State Replacement of Rotating Mirror Cameras  

SciTech Connect (OSTI)

Rotating mirror cameras have been the mainstay of mega-frame per second imaging for decades. There is still no electronic camera that can match a film based rotary mirror camera for the combination of frame count, speed, resolution and dynamic range. The rotary mirror cameras are predominantly used in the range of 0.1 to 100 micro-seconds per frame, for 25 to more than a hundred frames. Electron tube gated cameras dominate the sub microsecond regime but are frame count limited. Video cameras are pushing into the microsecond regime but are resolution limited by the high data rates. An all solid state architecture, dubbed ''In-situ Storage Image Sensor'' or ''ISIS'', by Prof. Goji Etoh, has made its first appearance into the market and its evaluation is discussed. Recent work at Lawrence Livermore National Laboratory has concentrated both on evaluation of the presently available technologies and exploring the capabilities of the ISIS architecture. It is clear though there is presently no single chip camera that can simultaneously match the rotary mirror cameras, the ISIS architecture has the potential to approach their performance.

Frank, A M; Bartolick, J M

2006-08-25T23:59:59.000Z

111

Thermomechanical characterization of a membrane deformable mirror  

SciTech Connect (OSTI)

A membrane deformable mirror has been investigated for its potential use in high-energy laser systems. Experiments were performed in which the deformable mirror was heated with a 1 kW incandescent lamp and the thermal profile, the wavefront aberrations, and the mechanical displacement of the membrane were measured. A finite element model was also developed. The wavefront characterization experiments showed that the wavefront degraded with heating. Above a temperature of 35 deg. C, the wavefront characterization experiments indicated a dramatic increase in the high-order wavefront modes before the optical beam became immeasurable in the sensors. The mechanical displacement data of the membrane mirror showed that during heating, the membrane initially deflected towards the heat source and then deflected away from the heat source. Finite element analysis (FEA) predicted a similar displacement behavior as shown by the mechanical displacement data but over a shorter time scale and a larger magnitude. The mechanical displacement data also showed that the magnitude of membrane displacement increased with the experiments that involved higher temperatures. Above a temperature of 35 deg. C, the displacement data showed that random deflections as a function of time developed and that the magnitude of these deflections increased with increased temperature. We concluded that convection, not captured in the FEA, likely played a dominant role in mirror deformation at temperatures above 35 deg. C.

Morse, Kathleen A.; McHugh, Stuart L.; Fixler, Jeff

2008-10-10T23:59:59.000Z

112

Mirroring and the development of action understanding  

Science Journals Connector (OSTI)

...seems possible that motor processes could be involved in the prospective...understanding the developmental processes that shape the mirror neuron...require understanding the interrelated neural systems at work in...infants engage these same processes in making sense of others...

2014-01-01T23:59:59.000Z

113

Radiation by Moving Mirrors in Curved Space-Time  

Science Journals Connector (OSTI)

......theory in the presence of a mirror in a curved two-dimensional...change of acceleration of the mirror is independent of the state...comoving flux emitted by a mirror lowered in a static gravitational...Theory in Two-Dimensional Schwarzschild-de Sitter Spacetime. II......

Adrian Ottewill; Shin Takagi

1988-01-01T23:59:59.000Z

114

MULTIGAN: A NEW MULTICHARGED ION SOURCE BASED ON AXISYMETRIC MAGNETIC STRUCTURE  

E-Print Network [OSTI]

's [3,4]) takes back the two Mono1000 rings made of permanent magnets (NdFeB Vacodym 655HR) coupling of the axisymetric magnetic structures made only of permanent magnets with a high operating frequency. The magnetic Gauss, the mirror ratio is 1.92. After the iron design and the permanent magnet ring used, a mechanical

Paris-Sud XI, Université de

115

A Few Observations about Mounting Moderately Sized Mirrors  

SciTech Connect (OSTI)

Most of the mirror mounting literature has focused on small (less than 0.1 meters) or large (greater than 1 meter) mirrors. We will examine the theory and practice of mounting moderately sized mirrors (between 0.1 and 1 meter). Two examples will be taken from optical diagnostic systems designed for the National Ignition Facility (NIF). In both cases the mirrors were removable (not bonded in place). One of the examples will be for a mirror with a poor aspect ratio (i.e. diameter to thickness ratio greater than 15:1).

Kaufman, M. I.

2011-09-01T23:59:59.000Z

116

Magnetic chicane for terahertz management  

DOE Patents [OSTI]

The introduction of a magnetic electron beam orbit chicane between the wiggler and the downstream initial bending dipole in an energy recovering Linac alleviates the effects of radiation propagated from the downstream bending dipole that tend to distort the proximate downstream mirror of the optical cavity resonator.

Benson, Stephen (Yorktown, VA); Biallas, George Herman (Yorktown, VA); Douglas, David (Yorktown, VA); Jordan, Kevin Carl (Newport News, VA); Neil, George R. (Williamsburg, VA); Michelle D. Shinn (Newport News, VA); Willams, Gwyn P. (Yorktown, VA)

2010-12-28T23:59:59.000Z

117

Two-mirror Schwarzschild aplanats. Basic relations  

E-Print Network [OSTI]

It is shown that the theory of aplanatic two-mirror telescopes developed by Karl Schwarzschild in 1905 leads to the unified description both the prefocal and the postfocal systems. The class of surfaces in the ZEMAX optical program has been properly extended to ascertain the image quality in exact Schwarzschild aplanats. A comparison of Schwarzschild aplanats with approximate Ritchey-Chretien and Gregory-Maksutov aplanatic telescopes reveals a noticeable advantage of the former at fast focal ratio of the system.

Terebizh, V Y

2005-01-01T23:59:59.000Z

118

Two-mirror Schwarzschild aplanats. Basic relations  

E-Print Network [OSTI]

It is shown that the theory of aplanatic two-mirror telescopes developed by Karl Schwarzschild in 1905 leads to the unified description both the prefocal and the postfocal systems. The class of surfaces in the ZEMAX optical program has been properly extended to ascertain the image quality in exact Schwarzschild aplanats. A comparison of Schwarzschild aplanats with approximate Ritchey-Chretien and Gregory-Maksutov aplanatic telescopes reveals a noticeable advantage of the former at fast focal ratio of the system.

V. Yu. Terebizh

2005-02-05T23:59:59.000Z

119

Energy confinement studies in the tandem mirror experiment (TMX): Power balance  

Science Journals Connector (OSTI)

The power balance in the Tandem Mirror Experiment (TMX) is studied for several days of operation. Between them these days typified the operating range of TMX. Examining the power balance on axis it is found that 60% to 100% of the power is carried to the end walls by escaping central?cell ions. Globally these calculations account for 70% to 100% of the input power on each of the days studied. Based upon the power balance the energy confinement times of the particle species are calculated. The end?cell ion energy confinement time is similar to that achieved in the 2XIIB single?cell magnetic mirror experiment whereas the electron energy confinement in TMX was 10 to 100 times better. The central?cell ion energy confinement in the central flux tube was determined by axial particle loss. At the central?cell plasma?edge radial particle transport and charge exchange with the fueling gas are important processes.

D. P. Grubb; S. L. Allen; T. A. Casper; J. F. Clauser; F. H. Coensgen; D. L. Correll; W. C. Cummins; J. C. Davis; D. Dietrich; R. P. Drake; J. H. Foote; R. J. Fortner; A. H. Futch; R. K. Goodman; G. E. Gryczkowski; E. B. Hooper Jr.; R. S. Hornady; A. L. Hunt; C. V. Karmendy; T. Nash; W. E. Nexsen; W. L. Pickles; G. D. Porter; P. Poulsen; T. C. Simonen; D. R. Slaughter; G. A. Hallock; O. T. Strand

1983-01-01T23:59:59.000Z

120

Mirror Film Company Has 'Concentrated' Plans for Expansion | Department of  

Broader source: Energy.gov (indexed) [DOE]

Mirror Film Company Has 'Concentrated' Plans for Expansion Mirror Film Company Has 'Concentrated' Plans for Expansion Mirror Film Company Has 'Concentrated' Plans for Expansion September 10, 2010 - 1:19pm Addthis Lorelei Laird Writer, Energy Empowers In concentrating solar power, glass is king-but it's fighting to hold on to its crown. The reflectivity of glass mirrors makes them a great choice for focusing sunlight onto a heat generator. However, the glass mirrors can be expensive and heavy -- reducing their ability to compete with conventional energy sources. ReflecTech Inc. has an option: a silvered polymer-based film that does the same job, but with half the weight and cost. Using that film, the company can make 100,000 square feet of mirror panels per year at its factory in Arvada, Colo. Through an Advanced Manufacturing 48C tax credit through the Recovery Act,

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

Neutron-Mirror-Neutron Oscillations in a Trap  

E-Print Network [OSTI]

We calculate the rate of neutron-mirror-neutron oscillations for ultracold neutrons trapped in a storage vessel. Recent experimental bounds on the oscillation time are discussed.

B. Kerbikov; O. Lychkovskiy

2008-04-03T23:59:59.000Z

122

Neutronmirror-neutron oscillations in a trap  

Science Journals Connector (OSTI)

We calculate the rate of neutronmirror-neutron oscillations for ultracold neutrons trapped in a storage vessel. Recent experimental bounds on the oscillation time are discussed.

B. Kerbikov and O. Lychkovskiy

2008-06-27T23:59:59.000Z

123

Mirror Advanced Reactor Study (MARS) final report summary  

SciTech Connect (OSTI)

The Mirror Advanced Reactor Study (MARS) has resulted in an overview of a first-generation tandem mirror reactor. The central cell fusion plasma is self-sustained by alpha heating (ignition), while electron-cyclotron resonance heating and negative ion beams maintain the electrostatic confining potentials in the end plugs. Plug injection power is reduced by the use of high-field choke coils and thermal barriers, concepts to be tested in the Tandem Mirror Experiment-Upgrade (TMX-U) and Mirror Fusion Test Facility (MFTF-B) at Lawrence Livermore National Laboratory.

Henning, C.D.; Logan, B.G.; Carlson, G.A.; Perkins, L.J.; Werner, R.W.; Gordon, J.D.; Parmer, J.F.; Bilton, J.R.; Glancy, J.E.; Kulcinski, G.L.

1983-12-08T23:59:59.000Z

124

Super-Gaussian mirror for high-field-seeking molecules  

SciTech Connect (OSTI)

A matter wave mirror using a single, pulsed, super-Gaussian (SG) optical beam for specular reflection of neutral ground-state molecules is studied. The mirror has a high reflectivity close to 100% and nearly perfect specular reflection over a large incident angle. This mirror avoids the usual problems due to surface roughness and the van der Waals interactions that occur in conventional atomic mirrors. Further, it is capable of reflectance and transmittance with applications to velocity filtering and deceleration of cold molecules.

Dong Guangjiong; Edvadsson, Sverker [Electronic Division, ITM, Mid Sweden University, 851 70, Sundsvall (Sweden); Lu Weiping; Barker, P.F. [Physics Department, School of Engineering and Physical Science, Heriot-Watt University, Edinburgh, Scotland (United Kingdom)

2005-09-15T23:59:59.000Z

125

Elliptically Bent X-ray Mirrors with Active Temperature Stabilization  

E-Print Network [OSTI]

stabilization based on a Peltier element attached directlyof the mirror with a Peltier element attached directly tostabilization based on a Peltier element have shown a

Yuan, Sheng

2010-01-01T23:59:59.000Z

126

Elliptically Bent X-ray Mirrors with Active Temperature Stabilization  

SciTech Connect (OSTI)

We present details of design of elliptically bent Kirkpatrick-Baez mirrors developed and successfully used at the Advanced Light Source for submicron focusing. A distinctive feature of the mirror design is an active temperature stabilization based on a Peltier element attached directly to the mirror body. The design and materials have been carefully optimized to provide high heat conductance between the mirror body and substrate. We describe the experimental procedures used when assembling and precisely shaping the mirrors, with special attention paid to laboratory testing of the mirror-temperature stabilization. For this purpose, the temperature dependence of the surface slope profile of a specially fabricated test mirror placed inside a temperature-controlled container was measured. We demonstrate that with active mirror-temperature stabilization, a change of the surrounding temperature by more than 3K does not noticeably affect the mirror figure. Without temperature stabilization, the surface slope changes by approximately 1.5 ?mu rad rms (primarily defocus) under the same conditions.

Yuan, Sheng; Church, Matthew; Yashchuk, Valeriy V.; Goldberg, Kenneth A.; Celestre, Rich; McKinney, Wayne R.; Kirschman, Jonathan; Morrison, Greg; Noll, Tino; Warwick, Tony; Padmore, Howard A.

2010-01-31T23:59:59.000Z

127

Using the Uncharged Kerr Black Hole as a Gravitational Mirror  

Science Journals Connector (OSTI)

We extend the study of the possible use of the Schwarzschild black hole as a gravitational mirror to the more general case of an...

Claes R. Cramer

1997-04-01T23:59:59.000Z

128

Stroke amplifier for deformable mirrors Robert H. Webb, Marc J. Albanese, Yaopeng Zhou, Thomas Bifano, and  

E-Print Network [OSTI]

Stroke amplifier for deformable mirrors Robert H. Webb, Marc J. Albanese, Yaopeng Zhou, Thomas stroke of a deformable mirror. By arranging for the wavefront to traverse the deformable mirror more than to produce lower- cost mirrors. Unfortunately, most commercial MEMS mirrors have only a limited stroke

129

Wave-Driven Rotation In Centrifugal Mirrors  

SciTech Connect (OSTI)

Centrifugal mirrors use supersonic rotation to provide axial confinement and enhanced stability. Usually the rotation is produced using electrodes, but these electrodes have limited the rotation to the Alfven critical ionization velocity, which is too slow to be useful for fusion. Instead, the rotation could be produced using radio frequency waves. A fixed azimuthal ripple is a simple and efficient wave that could produce rotation by harnessing alpha particle energy. This is an extension of the alpha channeling effect. The alpha particle power and efficiency in a simulated devices is sufficient to produce rotation without external energy input. By eliminating the need for electrodes, this opens new opportunities for centrifugal traps.

Abraham J. Fetterman and Nathaniel J. Fisch

2011-03-28T23:59:59.000Z

130

Transport and equilibrium in field-reversed mirrors  

SciTech Connect (OSTI)

Two plasma models relevant to compact torus research have been developed to study transport and equilibrium in field reversed mirrors. In the first model for small Larmor radius and large collision frequency, the plasma is described as an adiabatic hydromagnetic fluid. In the second model for large Larmor radius and small collision frequency, a kinetic theory description has been developed. Various aspects of the two models have been studied in five computer codes ADB, AV, NEO, OHK, RES. The ADB code computes two dimensional equilibrium and one dimensional transport in a flux coordinate. The AV code calculates orbit average integrals in a harmonic oscillator potential. The NEO code follows particle trajectories in a Hill's vortex magnetic field to study stochasticity, invariants of the motion, and orbit average formulas. The OHK code displays analytic psi(r), B/sub Z/(r), phi(r), E/sub r/(r) formulas developed for the kinetic theory description. The RES code calculates resonance curves to consider overlap regions relevant to stochastic orbit behavior.

Boyd, J.K.

1982-09-01T23:59:59.000Z

131

Vortex strings in electric dipole radiation near a mirror  

Science Journals Connector (OSTI)

Abstract The energy flow pattern of the radiation emitted by an oscillating electric dipole near a mirror has a complicated structure, including numerous singularities and vortices. We consider the flow lines of energy in the plane through the surface normal and the oscillation direction of the dipole. It is shown that the vortices are due to the vanishing of the magnetic field at their centers. The locations of the vortices have the appearance of beads on strings, and there are four such strings. The rotation direction of the energy flow for each vortex on a given string is the same. There are two strings with clockwise rotation and two strings with counterclockwise rotation. Field lines of energy flow either start or end at the center of a vortex. For a given string, field lines end at each vortex or field lines start at each vortex. There are two strings on which field lines end at the centers of the vortices, and there are two strings on which field lines start inside the vortices.

Xin Li; Henk F. Arnoldus

2013-01-01T23:59:59.000Z

132

Optical evaluation of heliostat mirrors using caustics  

Science Journals Connector (OSTI)

Solar thermal power generation is based on the concept of concentrating solar radiation to provide high temperature heat for electricity generation via conventional power cycles. The high relative cost of optical subsystems necessitates a careful study of their components. Solar collector fields are typically modeled by ray-tracing or convolution methods; however no general method is available for engineering analysis. We propose the use of caustics to predict the image of the sun reflected by an arbitrary mirror of focal length F and aperture a on a target. The mirror surface is described parametrically by a quadric and placed at a distance L from the target on a heliostat. The method of caustics was validated against SolTRACE a ray-tracing code developed by U.S. National Renewable Energy Laboratories . We show that there is a value of a F which depends on a L for which the incident average energy flux to the target reaches a maximum. The method of caustics allows the efficient computation of the image on an arbitrary target surface and obviates many of the difficulties with ray-tracing methods.

2013-01-01T23:59:59.000Z

133

Initial results of the Tandem Mirror Experiment (TMX) at the Lawrence Livermore Laboratory  

SciTech Connect (OSTI)

Initial experimental results from the Tandem Mirror Experiment (TMX) are presented. Axial profiles of the plasma density and potential necessary for electrostatically enhanced confinement of the central-cell ions have been generated and sustained for the duration of neutral-beam injection. The resulting central-cell ion confinement against axial loss is improved by a factor as large as 9 above that given by magnetic confinement alone. The plasma exhibits gross magnetohydrodynamic stability and microstability. Under some conditions, a residual level of ion cyclotron fluctuations in the end cells heats the central-cell ions and degrades their confinement.

Grubb, D.P.; Anderson, C.A.; Casper, T.A.; Clauser, J.F.; Coensgen, F.H.; Correll, D.L.; Cummins, W.F.; Davis, J.C.; Drake, R.P.; Foote, J.H.

1980-04-02T23:59:59.000Z

134

Exact optics V. Null tests for the mirrors of Schwarzschild's spectrograph camera  

Science Journals Connector (OSTI)

......V. Null tests for the mirrors of Schwarzschild's spectrograph camera...lies behind the primary mirror, exactly as Schwarzschild found a century ago...eccentricities of the mirrors of Schwarzschild's original design should......

R. V. Willstrop

2007-12-21T23:59:59.000Z

135

MEASUREMENT OF MIRROR PANELS USING COLOURED PATTERN DEFLECTOMETRY  

E-Print Network [OSTI]

and parabolic dish solar concentrators. Factory production of mirror panels also requires accurate measurementsMEASUREMENT OF MIRROR PANELS USING COLOURED PATTERN DEFLECTOMETRY Paul M. Scott1 , and Greg Burgess2 1 Research Assistant, Solar Thermal Group, Australian National University (ANU), Building 32 North

136

Mirror Mode Structures in the Solar Wind: STEREO Observations  

E-Print Network [OSTI]

Mirror Mode Structures in the Solar Wind: STEREO Observations O. Enríquez-Rivera1 , X. Blanco-Cano1 Autónoma de México, Coyoacán, D.F., 04510, MEXICO 2. Institute of Geophysics and Planetary Physics of California, Berkeley, CA 94720, USA Abstract. Mirror mode structures occur in the solar wind either

California at Berkeley, University of

137

Fiber optic hydrophone sensor arrays using low reflectance internal mirrors  

E-Print Network [OSTI]

A new design of fiber optic hydrophone sensor arrays phics. using low reflectance internal mirrors in optical fibers is investigated. The mirrors are produced by fusion arc splicing of two fibers, one of which has a thin film of TiO2 on the end. A...

Lee, Jong-Seo

2012-06-07T23:59:59.000Z

138

THORIUM-BASED MIRRORS IN THE EXTREME ULTRAVIOLET Nicole Farnsworth  

E-Print Network [OSTI]

THORIUM-BASED MIRRORS IN THE EXTREME ULTRAVIOLET by Nicole Farnsworth Submitted to Brigham Young Ultraviolet and Thorium-based Mirrors . . . 1 1.2 Project Background the Optical Constants of Thorium Oxide 34 3.1 Reflectance and Transmittance Measurements

Hart, Gus

139

Compact Reflective Imaging Spectrometer Design Utilizing An Immersed Grating And Anamorphic Mirror  

DOE Patents [OSTI]

A compact imaging spectrometer comprising an entrance slit, an anamorphic mirror, a grating, and a detector array. The entrance slit directs light to the anamorphic mirror. The anamorphic mirror receives the light and directs the light to the grating. The grating receives the light from the anamorphic mirror and defracts the light back onto the anamorphic mirror. The anamorphic mirror focuses the light onto a detector array.

Lerner, Scott A. (Corvalis, OR)

2006-01-10T23:59:59.000Z

140

Plasma-wall interactions in tandem mirror machines  

SciTech Connect (OSTI)

A description is presented of the plasma-surface interactions in thermal-barrier tandem-mirror machines. The thermal-barrier mode of axial confinement is an integral part of a tandem mirror, and it dictates the required plasma conditions, particularly at the surface of the plasma. For this reason, a qualitative discussion of the thermal barrier is presented first in Section 2. A brief description of the experimental configuration used in tandem mirrors to create the thermal barrier is then examined in detail in Section 3; the TMX-U and MFTF-B machines are used as specific examples. In Section 4, the relevant plasma-surface interaction issues are addressed, and experimental results from currently operating tandom mirror machines are included. Section 5 is both a summary and a discussion of future work concerned with plasma-surface interactions in tandem mirrors.

Allen, S.L.

1984-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Background-reducing X-ray multilayer mirror  

DOE Patents [OSTI]

Background-reducing x-ray multilayer mirror. A multiple-layer "wavetrap" deposited over the surface of a layered, synthetic-microstructure soft x-ray mirror optimized for reflectivity at chosen wavelengths is disclosed for reducing the reflectivity of undesired, longer wavelength incident radiation incident thereon. In three separate mirror designs employing an alternating molybdenum and silicon layered, mirrored structure overlaid by two layers of a molybdenum/silicon pair anti-reflection coating, reflectivities of near normal incidence 133, 171, and 186 .ANG. wavelengths have been optimized, while that at 304 .ANG. has been minimized. The optimization process involves the choice of materials, the composition of the layer/pairs as well as the number thereof, and the distance therebetween for the mirror, and the simultaneous choice of materials, the composition of the layer/pairs, and their number and distance for the "wavetrap."

Bloch, Jeffrey J. (Los Alamos, NM); Roussel-Dupre', Diane (Los Alamos, NM); Smith, Barham W. (Los Alamos, NM)

1992-01-01T23:59:59.000Z

142

Contained Modes In Mirrors With Sheared Rotation  

SciTech Connect (OSTI)

In mirrors with E B rotation, a fixed azimuthal perturbation in the lab frame can appear as a wave in the rotating frame. If the rotation frequency varies with radius, the plasma-frame wave frequency will also vary radially due to the Doppler shift. A wave that propagates in the high rotation plasma region might therefore be evanescent at the plasma edge. This can lead to radially localized Alfven eigenmodes with high azimuthal mode numbers. Contained Alfven modes are found both for peaked and non-peaked rotation profiles. These modes might be useful for alpha channeling or ion heating, as the high azimuthal wave number allows the plasma wave frequency in the rotating frame to exceed the ion cyclotron frequency. __________________________________________________

Abraham J. Fetterman and Nathaniel J. Fisch

2010-10-08T23:59:59.000Z

143

TMX-U (Tandem Mirror Experiment-Upgrade) tandem-mirror thermal-barrier experiments  

SciTech Connect (OSTI)

Thermal-barrier experiments have been carried out in the Tandem Mirror Experiment-Upgrade (TMX-U). Measurements of nonambipolar and ambipolar radial transport show that these transport processes, as well as end losses, can be controlled at modest densities and durations. Central-cell heating methods using ion-cyclotron heating (ICH) and neutral-beam injection have been demonstrated. Potential mesurements with recently developed methods indicate that deep thermal barriers can be established.

Simonen, T.C.; Allen, S.L.; Baldwin, D.E.; Barter, J.D.; Berzins, L.V.; Carter, M.R.; Casper, T.A.; Clauser, J.F.; Coensgen, F.H.; Correll, D.L.

1986-10-29T23:59:59.000Z

144

E-Print Network 3.0 - advanced magnetic materials Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

B. ParkerJ. Cozzolino S. Peggs... W. Louie E. WillenJ. Muratore 12;Construction and Test of the Magnetic Mirror Model of the HTS RIA Source: Gupta, Ramesh - Superconducting...

145

Optimal Light Beams and Mirror Shapes for Future LIGO Interferometers  

E-Print Network [OSTI]

We report the results of a recent search for the lowest value of thermal noise that can be achieved in LIGO by changing the shape of mirrors, while fixing the mirror radius and maintaining a low diffractional loss. The result of this minimization is a beam with thermal noise a factor of 2.32 (in power) lower than previously considered Mesa Beams and a factor of 5.45 (in power) lower than the Gaussian beams employed in the current baseline design. Mirrors that confine these beams have been found to be roughly conical in shape, with an average slope approximately equal to the mirror radius divided by arm length, and with mild corrections varying at the Fresnel scale. Such a mirror system, if built, would impact the sensitivity of LIGO, increasing the event rate of observing gravitational waves in the frequency range of maximum sensitivity roughly by a factor of three compared to an Advanced LIGO using Mesa beams (assuming all other noises remain unchanged). We discuss the resulting beam and mirror properties and study requirements on mirror tilt, displacement and figure error, in order for this beam to be used in LIGO detectors.

Mihai Bondarescu; Oleg Kogan; Yanbei Chen

2008-06-14T23:59:59.000Z

146

Mobile-mirror concentrators for solar thermal power plants  

SciTech Connect (OSTI)

Seven central-receiver, solar-thermal power plants with heliostat concentrators have been built around the world in the last two decades. This technology has proven to be much too expensive for commercial power plants and efforts to reduce the cost have reached an impasse. It is the nature of the solar concentrators which makes it so expensive. There are two types of concentrators: those, called heliostats, with mirrors on stationary supports, and those with mirrors on mobile supports. Mobile mirrors are potentially much cheaper than heliostats.

Ratliff, G. [Ratliff (George), Pittsburgh, PA (United States)

1999-11-01T23:59:59.000Z

147

Is There a Switchable Mirror in Your Future?  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Is There a Switchable Mirror in Your Future? Is There a Switchable Mirror in Your Future? Speaker(s): Thomas Richardson Date: February 10, 2005 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Venkat Srinivasan Electrochromic devices (switchable mirrors) that exhibit large dynamic ranges for reflectance in the visible and infrared regimes can now be made using a variety of materials. Devices incorporating these films can be used to improve energy efficiency in buildings and vehicles by controlling the flow of heat not only through windows and skylights, but also through opaque roof and wall panels. Switchable mirrors based on three completely different chemical reactions have been developed at LBNL. The best known example utilizes conversion of a thin metal film to an insulating and transparent metal hydride by either direct exposure to hydrogen gas

148

Lightweight diaphragm mirror module system for solar collectors  

DOE Patents [OSTI]

A mirror module system is provided for accurately focusing solar radiation on a point or a line as defined by an array of solar collectors. Each mirror module includes a flexible membrane stretched over a frame in a manner similar to that of a drum or a trampoline and further includes a silvered glass or plastic mirror for forming an optical reflecting surface. The configuration of the optical reflecting surface is variably adjustable to provide for the accurate focusing of the solar energy on a given collector array, e.g., a point or a linear array arrangement. The flexible mirror-membrane combination is lightweight to facilitate installation and reduce system cost yet structurally strong enough to provide for the precise focusing of the incident solar radiation in a semi-rigid reflector system in which unwanted reflector displacement is minimized.

Butler, B.L.

1984-01-01T23:59:59.000Z

149

The Mirror-Image Argument: An Additional Reply to Johansson  

Science Journals Connector (OSTI)

In previous work we have defended a version of the deprivation theory of deaths badness. (e.g., Brueckner and Fischer 1986) Part of our defense involves a reply to Lucretius Mirror-Image Argument. Lucretius p...

John Martin Fischer; Anthony Brueckner

2014-12-01T23:59:59.000Z

150

The Use of Genetic Algorithms in Multilayer Mirror Optimization  

E-Print Network [OSTI]

The Use of Genetic Algorithms in Multilayer Mirror Optimization by Shannon Lunt March 1999.3 Optimization Techniques . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.3.1 Local Optimizers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 1.3.2 Global Optimizers

Hart, Gus

151

EUV damage threshold measurements of Mo/Si multilayer mirrors  

Science Journals Connector (OSTI)

An EUV Schwarzschild objective consisting of two spherical, annular mirror substrates coated with Mo/Si multilayers (reflectivity...R?0.65@13.5nm) provides high EUV fluences [13]. The incidence angles on the sam...

Matthias Mller; Frank Barkusky; Torsten Feigl; Klaus Mann

2012-08-01T23:59:59.000Z

152

History of mirror casting, figuring, segmentation and active optics  

Science Journals Connector (OSTI)

The accurate general figures for the mirrors with which one could achieve the optimum ... the beginning of the twentieth century by Karl Schwarzschild. A first design for a reflecting telescope ... dispersing len...

Lothar Noethe

2009-08-01T23:59:59.000Z

153

Wavefront control in space with MEMS deformable mirrors  

E-Print Network [OSTI]

To meet the high contrast requirement of 1 10[superscript ?10] to image an Earth-like planet around a Sun-like star, space telescopes equipped with coronagraphs require wavefront control systems. Deformable mirrors (DMs) ...

Cahoy, Kerri L.

154

Electrostatic plasma-confinement experiments in a tandem mirror system  

SciTech Connect (OSTI)

Results from the tandem mirror experiment are described. The configuration of axial density and potential profiles are created and sustained by neutral-beam injection and gas fueling. Plasma confinement in the center cell is shown to be improved by the end plugs by as much as a factor of 9. The electron temperature is higher than that achieved in our earlier 2XIIB single-cell mirror experiment.

Coensgen, F.H.; Anderson, C.A.; Casper, T.A.; Clauser, J.F.; Condit, W.C.; Correll, D.L.; Cummins, W.F.; Davis, J.C.; Drake, R.P.; Foote, J.H.; Futch, A.H.; Goodman, R.K.; Grubb, D.P.; Hallock, G.A.; Hornady, R.S.; Hunt, A.L.; Logan, B.G.; Munger, R.H.; Nexsen, W.E.; Simonen, T.C.; Slaughter, D.R.; Stallard, B.W.; Strand, O.T.

1980-04-28T23:59:59.000Z

155

Electrostatic Plasma-Confinement Experiments in a Tandem Mirror System  

Science Journals Connector (OSTI)

Results from the tandem mirror experiment are described. The configuration of axial density and potential profiles are created and sustained by neutral-beam injection and gas fueling. Plasma confinement in the center cell is shown to be improved by the end plugs by as much as a factor of 9. The electron temperature is higher than that achieved in our earlier 2XIIB single-cell mirror experiment.

F. H. Coensgen, C. A. Anderson, T. A. Casper, J. F. Clauser, W. C. Condit, D. L. Correll, W. F. Cummins, J. C. Davis, R. P. Drake, J. H. Foote, A. H. Futch, R. K. Goodman, D. P. Grubb, G. A. Hallock, R. S. Hornady, A. L. Hunt, B. G. Logan, R. H. Munger, W. E. Nexsen, T. C. Simonen, D. R. Slaughter, B. W. Stallard, and O. T. Strand

1980-04-28T23:59:59.000Z

156

Switchable Mirrors Based on Nickel-Magnesium Films  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Switchable Mirrors Based on Nickel-Magnesium Films Switchable Mirrors Based on Nickel-Magnesium Films Title Switchable Mirrors Based on Nickel-Magnesium Films Publication Type Journal Article LBNL Report Number LBNL-47180 Year of Publication 2001 Authors Richardson, Thomas J., Jonathan L. Slack, Robert D. Armitage, Robert Kostecki, Baker Farangis, and Michael D. Rubin Journal Applied Physics Letters Volume 78 Pagination 3047 Call Number LBNL-47180 Abstract An electrochromic mirror electrode based on reversible uptake of hydrogen in nickel magnesium alloy films is reported. Thin, magnesium-rich Ni-Mg films prepared on glass substrates by cosputtering from Ni and Mg targets are mirror-like in appearance and have low visible transmittance. Upon exposure to hydrogen gas or on cathodic polarization in alkaline electrolyte, the films take up hydrogen and become transparent. When hydrogen is removed, the mirror properties are recovered. The transition is believed to result from reversible formation of Mg2NiH4 and MgH2. A thin overlayer of palladium was found to enhance the kinetics of hydrogen insertion and extraction, and to protect the metal surface against oxidation.

157

Single-layer mirrors for advanced research light sources  

SciTech Connect (OSTI)

X-ray mirrors are needed for beam guidance, beam alignment and monochromatisation at third-generation synchrotron light sources (PETRA III) and forthcoming Free-Electron Lasers (LCLS, European XFEL). Amorphous carbon coatings are currently used as total reflection mirrors at FLASH to guide the photon beam to the various beamlines. These coatings were prepared by means of magnetron sputtering. The new GKSS sputtering facility for the deposition of single and multilayer mirrors with a length of up to 1500 mm and a width of up to 120 mm is in operation. In this contribution we present the results of this new deposition system. A major advantage is that it is now possible to prepare one, two or more mirrors with similar properties over the whole deposition length. The mirror properties were investigated by means of X-ray reflectometry and interference microscopy. The performance of the mirrors is analyzed, considering X-ray reflectivity, film thickness and surface roughness. The uniformity of these properties over the whole deposition length of 1500 mm is demonstrated. The results obtained will be discussed and compared with former results.

Stoermer, M.; Horstmann, C. [GKSS Research Centre Geesthacht GmbH, Institute of Materials Research, Max-Planck-Str. 1, D-21502 Geesthacht (Germany); Siewert, F. [Helmholtz Zentrum Berlin / BESSY-II, Albert-Einstein-Str. 15, 12489 Berlin (Germany); Scholze, F.; Krumrey, M. [Physikalisch-Technische Bundesanstalt (PTB), Abbestr. 2-12, 10587 Berlin (Germany); Hertlein, F.; Matiaske, M.; Wiesmann, J. [Incoatec GmbH, Max-Planck-Str. 2, D-21502 Geesthacht (Germany); Gaudin, J. [European XFEL, DESY, 22603 Hamburg (Germany)

2010-06-23T23:59:59.000Z

158

Do Mirrors for Gravitational Waves Exist?  

E-Print Network [OSTI]

Thin superconducting films are predicted to be highly reflective mirrors for gravitational waves at microwave frequencies. The quantum mechanical non-localizability of the negatively charged Cooper pairs, which is protected from the localizing effect of decoherence by an energy gap, causes the pairs to undergo non-picturable, non-geodesic motion in the presence of a gravitational wave. This non-geodesic motion, which is accelerated motion through space, leads to the existence of mass and charge supercurrents inside the superconducting film. On the other hand, the decoherence-induced localizability of the positively charged ions in the lattice causes them to undergo picturable, geodesic motion as they are carried along with space in the presence of the same gravitational wave. The resulting separation of charges leads to a virtual plasma excitation within the film that enormously enhances its interaction with the wave, relative to that of a neutral superfluid or any normal matter. The existence of strong mass supercurrents within a superconducting film in the presence of a gravitational wave, dubbed the "Heisenberg-Coulomb effect," implies the specular reflection of a gravitational microwave from a film whose thickness is much less than the London penetration depth of the material, in close analogy with the electromagnetic case. The argument is developed by allowing classical gravitational fields, which obey Maxwell-like equations, to interact with quantum matter, which is described using the BCS and Ginzburg-Landau theories of superconductivity, as well as a collisionless plasma model. Several possible experimental tests of these ideas, including mesoscopic ones, are presented alongside comments on the broader theoretical implications of the central hypothesis.

Stephen J. Minter; Kirk Wegter-McNelly; Raymond Y. Chiao

2009-06-30T23:59:59.000Z

159

Black hole firewalls, smoke and mirrors  

Science Journals Connector (OSTI)

The radiation emitted by a black hole (BH) during its evaporation has to have some degree of quantum coherence to accommodate a unitary time evolution. We parametrize the degree of coherence by the number of coherently emitted particles Ncoh and show that it is severely constrained by the equivalence principle. We discuss, in this context, the fate of a shell of matter that falls into a Schwarzschild BH. Two points of view are considered: that of a stationary external observer and that of the shell itself. From the perspective of the shell, the near-horizon region has an energy density proportional to Ncoh2 in Schwarzschild units. So, if Ncoh is parametrically larger than the square root of the BH entropy SBH1/2, a firewall or more generally a wall of smoke forms and the equivalence principle is violated while the BH is still semiclassical. To have a degree of coherence that is parametrically smaller than SBH1/2, one has to introduce a new sub-Planckian gravitational length scale, which likely also violates the equivalence principle. And so our previously proposed model which has Ncoh=SBH1/2 is singled out. From the external-observer perspective, we find that the time it takes for the information about the state of the shell to get re-emitted from the BH is inversely proportional to Ncoh. When the rate of information release becomes of order unity, the semiclassical approximation starts to break down and the BH becomes a perfect reflecting information mirror.

Ram Brustein and A.?J.?M. Medved

2014-07-16T23:59:59.000Z

160

Approximate Mirror Symmetry in Heliospheric Plasma Flow Explains VOYAGER 2 Observations  

E-Print Network [OSTI]

The Sun and the undisturbed interstellar magnetic field and plasma velocity vectors (Bis,Vis) define a mirror symmetry plane of the flow at large heliospheric distances. We show that for the Bis direction defined by IBEX Ribbon center, the radial direction of Voyager 2 over the last decade, and the (thermal proton) plasma velocity measured by the spacecraft since 2010.5, are almost parallel to the (Bis,Vis)-plane, which coincides in practice with the Hydrogen Deflection Plane. These facts can be simply explained if approximate mirror symmetry is also maintained on the inner side of the heliopause. Such approximate symmetry is possible since the solar wind ram pressure is almost spherically symmetric and the plasma beta value in the inner heliosheath is high. In the proposed symmetry, the plasma flow speed measured by Voyager 2 in the inner heliosheath is expected to rotate more in the transverse than in the polar direction (explanation alternative to McComas & Schwadron (2014)), in evident agreement with ...

Grygorczuk, Jolanta; Grzedzielski, Stan

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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161

Energy-dependent finite-orbit treatment for plasma buildup in mirror fusion devices  

SciTech Connect (OSTI)

A computer simulation of hot plasma buildup in mirror fusion devices and results from this model are presented. In a small, hot magnetically confined plasma, the ion orbit radius (rho/sub i/) can be comparable to the plasma radius (R/sub p/). It a mirror-confined plasma were rho/sub i//R/sub p/ > 1/25 (such as 2XII-B), a point kinetic treatment of ion interactions becomes inaccurate and a finite gyro-radius (FGR) treatment must be used to adequately describe plasma buildup processes. This is particularly true for describing losses due to cold-gas charge exchange (c-x) near the plasma surface, since a particle lost near the vacuum interface may have contributed to the density as far as 2 rho/sub i/ radially inward from the c-x point. A similar FGR effect applies to beam-deposited ions whose large orbits influence the density up to 2 rho/sub i/ from the trapping point.

Campbell, M.M.

1980-01-01T23:59:59.000Z

162

Micro Mirrors for High-speed Laser Deflection and Patterning  

Science Journals Connector (OSTI)

Abstract This paper focuses on high-speed optical MEMS Scanners and Micro Mirror Arrays. Devices supporting spot/pixel rateshigher than 10 Mpixel/s are considered and discussed regarding limits and possibilities to further improve speed and optical properties. Several variants of both types, developed by our group, are presented. Scanning Micro Mirrors with frequencies up to 100kHz enable spot rates of up to 130 Mpixels / s at 650nm. Bragg-coatings enable high power applications up to 20 W (beam 2mm). Challenges like static and dynamic mirror planariy are discussed. A 29-kHz-scanner for laser projection serves as application example. Highly parallel operated Micro Mirror Arrays extend pattern speed to 10 Gpixel / s including analog grey scaling. Irradiation tests prove stable operation of the mirrors at DUV. Prospects regarding optical planarity and high reflective coatings are discussed. By means of two examples, laser patterning of semiconductor masks and laser patterning of Printed Circuit Boards, properties of the spatial light modulators are presented. The two device classes are compared regarding spot/pixel rate and frequency. The comparison includes representative MEMS device examples from literature.

Harald Schenk; Jan Grahmann; Thilo Sandner; Michael Wagner; Ulrike Dauderstdt; Jan-Uwe Schmidt

2014-01-01T23:59:59.000Z

163

Thermal characteristics of a classical solar telescope primary mirror  

E-Print Network [OSTI]

We present a detailed thermal and structural analysis of a 2m class solar telescope mirror which is subjected to a varying heat load at an observatory site. A 3-dimensional heat transfer model of the mirror takes into account the heating caused by a smooth and gradual increase of the solar flux during the day-time observations and cooling resulting from the exponentially decaying ambient temperature at night. The thermal and structural response of two competing materials for optical telescopes, namely Silicon Carbide -best known for excellent heat conductivity and Zerodur -preferred for its extremely low coefficient of thermal expansion, is investigated in detail. The insight gained from these simulations will provide a valuable input for devising an efficient and stable thermal control system for the primary mirror.

Banyal, Ravinder K

2011-01-01T23:59:59.000Z

164

Mirror eclipses in the cataclysmic variable IP Peg  

E-Print Network [OSTI]

We present time resolved K-band infrared spectra of the dwarf nova (DN) IP Peg in early quiescence. The Brackett-gamma and HeI lines in our data show hitherto unseen behaviour, which we term a mirror eclipse, and interpret as an eclipse of the secondary star by an optically thin accretion disc. Mirror eclipses are a direct probe of the structure and physical conditions of accretion discs. For example, on assuming the relevant level populations to be in LTE, we constrain the temperature and density of the optically thin material causing the mirror eclipse to be 10,000 < T < 20,000 K and \\rho ~10^-11 g/cm^3 respectively. In order to match our data we find that at least the outermost 20% of the disc (in radius) must be entirely optically thin. Implications for time-dependant disc models are examined.

S. P. Littlefair; V. S. Dhillon; T. R. Marsh; E. T. Harlaftis

2001-06-11T23:59:59.000Z

165

High repetition rate plasma mirror device for attosecond science  

SciTech Connect (OSTI)

This report describes an active solid target positioning device for driving plasma mirrors with high repetition rate ultra-high intensity lasers. The position of the solid target surface with respect to the laser focus is optically monitored and mechanically controlled on the nm scale to ensure reproducible interaction conditions for each shot at arbitrary repetition rate. We demonstrate the target capabilities by driving high-order harmonic generation from plasma mirrors produced on glass targets with a near-relativistic intensity few-cycle pulse laser system operating at 1kHz. During experiments, residual target surface motion can be actively stabilized down to 47?nm (root mean square), which ensures sub-300-as relative temporal stability of the plasma mirror as a secondary source of coherent attosecond extreme ultraviolet radiation in pump-probe experiments.

Borot, A.; Douillet, D.; Iaquaniello, G.; Lefrou, T.; Lopez-Martens, R. [Laboratoire d'Optique Applique, ENSTA-ParisTech, CNRS, Ecole Polytechnique, UMR 7639, 91761 Palaiseau (France)] [Laboratoire d'Optique Applique, ENSTA-ParisTech, CNRS, Ecole Polytechnique, UMR 7639, 91761 Palaiseau (France); Audebert, P.; Geindre, J.-P. [Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex (France)] [Laboratoire pour l'Utilisation des Lasers Intenses, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex (France)

2014-01-15T23:59:59.000Z

166

Surface Slope Metrology on Deformable Soft X-ray Mirrors  

SciTech Connect (OSTI)

We report on the current state of surface slope metrology on deformable mirrors for soft x-rays at the Advanced Light Source (ALS). While we are developing techniques for in situ at-wavelength tuning, we are refining methods of ex situ visible-light optical metrology to achieve sub-100-nrad accuracy. This paper reports on laboratory studies, measurements and tuning of a deformable test-KB mirror prior to its use. The test mirror was bent to a much different optical configuration than its original design, achieving a 0.38 micro-radian residual slope error. Modeling shows that in some cases, by including the image conjugate distance as an additional free parameter in the alignment, along with the two force couples, fourth-order tangential shape errors (the so-called bird shape) can be reduced or eliminated.

Yuan Sheng; Yashchuk, Valeriy V.; Celestre, Rich; Church, Matthew; McKinney, Wayne R.; Morrison, Greg; Warwick, Tony [Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Goldberg, Kenneth A. [Center for X-ray Optics, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States)

2010-06-23T23:59:59.000Z

167

Extreme ultraviolet diagnosis of a neutral-beam-heated mirror machine  

SciTech Connect (OSTI)

Extreme ultraviolet emissions from the LLL 2XIIB fusion research experiment have been studied. (2XIIB was a magnetic-mirror-plasma-confinement device; beams of high-energy (20 keV) neutral deuterium created a high-density, high-temperature plasma.) A normal-incidence concave-grating monochromator, equipped with a windowless photomultiplier tube, was used to measure emissions in the spectral region from 400 Angstrom to 1600 A. Emissions of oxygen, titanium, carbon, nitrogen, and deuterium were identified; the oxygen brightnesses at times exceeded 10/sup 18/ ph-s/sup -1/-cm/sup -2/-sr/sup -1/. A survey of the emission characteristics found the oxygen concentration was 3%, the other impurities had concentrations near 0.4%. The radiated power loss was about 5% of the deposited neutral beam power.

Drake, R.P.

1980-07-01T23:59:59.000Z

168

Hot electrons in the anchor region of the axicell design of the Mirror Fusion Test Facility (MFTF)  

SciTech Connect (OSTI)

The axicell design of the Mirror Fusion Test Facility (MFTF) requires electron cyclotron resonance heating (ECRH) up to average electron energies of as high as 450 keV. These temperatures, plus the magnetic field and plasma beta profiles, lead to the requirement for three frequencies-28, 35, and 56 (or 60) GHz. Power balance studies include the effects of scattering, drag, synchrotron radiation, and cold electron production, and they predict that about 600 kW of ECRH power is needed at each end of MFTF.

Shearer, J.W.

1982-09-14T23:59:59.000Z

169

IR Spectrometer Using 90-degree Off-axis Parabolic Mirrors  

SciTech Connect (OSTI)

A gated spectrometer has been designed for real-time, pulsed infrared (IR) studies at the National Synchrotron Light ource at the Brookhaven National Laboratory. A pair of 90-degree, off-axis parabolic mirrors are used to relay the light from an entrance slit to an output IR recording camera. With an initial wavelength range of 15004500 nm required, gratings could not be used in the spectrometer because grating orders would overlap. A magnesium oxide prism, placed between these parabolic mirrors, serves as the dispersion element. The spectrometer is doubly telecentric. With proper choice of the air spacing between the prism and the second parabolic mirror, any spectral region of interest within the InSb camera arrays sensitivity region can be recorded. The wavelengths leaving the second parabolic mirror are collimated, thereby relaxing the camera positioning tolerance. To set up the instrument, two different wavelength (visible) lasers are introduced at the entrance slit and made collinear with the optical axis via flip mirrors. After dispersion by the prism, these two laser beams are directed to tick marks located on the outside housing of the gated IR camera. This provides first-order wavelength calibration for the instrument. Light that is reflected off the front prism face is coupled into a high-speed detector to verify steady radiance during the gated spectral imaging. Alignment features include tick marks on the prism and parabolic mirrors. This instrument was designed to complement singlepoint pyrometry, which provides continuous time histories of a small collection of spots from shock-heated targets.

Robert M. Malone, Richard, G. Hacking, Ian J. McKenna, and Daniel H. Dolan

2008-09-02T23:59:59.000Z

170

Can mirror matter solve the the cosmological lithium problem?  

SciTech Connect (OSTI)

The abundance of lithium-7 confronts cosmology with a long lasting inconsistency between the predictions of standard Big Bang Nucleosynthesis with the baryonic density determined from the Cosmic Microwave Background observations on the one hand, and the spectroscopic determination of the lithium-7 abundance on the other hand. We investigated the influence of the existence of a mirror world, focusing on models in which mirror neutrons can oscillate into ordinary neutrons. Such a mechanism allows for an effective late time neutron injection, which induces an increase of the destruction of beryllium-7and thus a lower final lithium-7 abundance.

Coc, Alain [Centre de Sciences Nuclaires et de Sciences de la Matire (CSNSM), CNRS/IN2P3, Universit Paris Sud 11, UMR 8609, Btiment 104, 91405 Orsay Campus (France); Uzan, Jean-Philippe; Vangioni, Elisabeth [Institut d'Astrophysique de Paris, UMR-7095 du CNRS, Universit Pierre et Marie Curie, 98 bis bd Arago, 75014 Paris, France and Sorbonne Universits, Institut Lagrange de Paris, 98 bis bd Arago, 75014 Paris (France)

2014-05-02T23:59:59.000Z

171

Normal incidence x-ray mirror for chemical microanalysis  

DOE Patents [OSTI]

An x-ray mirror for both electron column instruments and micro x-ray fluorescence instruments for making chemical, microanalysis comprises a non-planar mirror having, for example, a spherical reflecting surface for x-rays comprised of a predetermined number of alternating layers of high atomic number material and low atomic number material contiguously formed on a substrate and whose layers have a thickness which is a multiple of the wavelength being reflected. For electron column instruments, the wavelengths of interest lie above 1.5nm, while for x-ray fluorescence instruments, the range of interest is below 0.2nm. 4 figs.

Carr, M.J.; Romig, A.D. Jr.

1987-08-05T23:59:59.000Z

172

ATLAS and CMS hints for a mirror Higgs boson  

E-Print Network [OSTI]

ATLAS and CMS have provided hints for the existence of a Higgs-like particle with mass of about 144 GeV with production cross section into standard decay channels which is about 50% that of the standard model Higgs boson. We show that this 50% suppression is exactly what the mirror matter model predicts when the two scalar mass eigenstates, each required to be maximal admixtures of a standard and mirror-Higgs boson, are separated in mass by more than their decay widths but less than the experimental resolution. We discuss prospects for the future confirmation of this interesting hint for non-standard Higgs physics.

Robert Foot; Archil Kobakhidze; Raymond R. Volkas

2011-11-10T23:59:59.000Z

173

Detection of atmospheric Cherenkov radiation using solar heliostat mirrors  

E-Print Network [OSTI]

The gamma-ray energy region between 20 and 250 GeV is largely unexplored. Ground-based atmospheric Cherenkov detectors offer a possible way to explore this region, but large Cherenkov photon collection areas are needed to achieve low energy thresholds. This paper discusses the development of a Cherenkov detector using the heliostat mirrors of a solar power plant as the primary collector. As part of this development, we built a prototype detector consisting of four heliostat mirrors and used it to record atmospheric Cherenkov radiation produced in extensive air showers created by cosmic ray particles.

Ong, R A

1996-01-01T23:59:59.000Z

174

ATLAS and CMS hints for a mirror Higgs boson  

Science Journals Connector (OSTI)

ATLAS and CMS have provided hints for the existence of a Higgs-like particle with mass of about 144GeV with production cross section into standard decay channels which is about 50% that of the standard model Higgs boson. We show that this 50% suppression is exactly what the mirror matter model predicts when the two scalar mass eigenstates, each required to be maximal admixtures of a standard and mirror-Higgs boson, are separated in mass by more than their decay widths but less than the experimental resolution. We discuss prospects for the future confirmation of this interesting hint for nonstandard Higgs physics.

Robert Foot; Archil Kobakhidze; Raymond R. Volkas

2011-11-28T23:59:59.000Z

175

residual magnetism  

Science Journals Connector (OSTI)

The magnetization, i.e., the magnetic polarization, that remains in a magnetized material after all attempts to remove the magnetization have been made. Note: An example of residual magnetization is the magnetiza...

2001-01-01T23:59:59.000Z

176

The hybrid reactor project based on the straight field line mirror concept  

SciTech Connect (OSTI)

The straight field line mirror (SFLM) concept is aiming towards a steady-state compact fusion neutron source. Besides the possibility for steady state operation for a year or more, the geometry is chosen to avoid high loads on materials and plasma facing components. A comparatively small fusion hybrid device with 'semi-poor' plasma confinement (with a low fusion Q factor) may be developed for industrial transmutation and energy production from spent nuclear fuel. This opportunity arises from a large fission to fusion energy multiplication ratio, Q{sub r} = P{sub fis}/P{sub fus}>>1. The upper bound on Q{sub r} is primarily determined by geometry and reactor safety. For the SFLM, the upper bound is Q{sub r} Almost-Equal-To 150, corresponding to a neutron multiplicity of k{sub eff}=0.97. Power production in a mirror hybrid is predicted for a substantially lower electron temperature than the requirement T{sub e} Almost-Equal-To 10 keV for a fusion reactor. Power production in the SFLM seems possible with Q Almost-Equal-To 0.15, which is 10 times lower than typically anticipated for hybrids (and 100 times smaller than required for a fusion reactor). This relaxes plasma confinement demands, and broadens the range for use of plasmas with supra-thermal ions in hybrid reactors. The SFLM concept is based on a mirror machine stabilized by qudrupolar magnetic fields and large expander tanks beyond the confinement region. The purpose of the expander tanks is to distribute axial plasma loss flow over a sufficiently large area so that the receiving plates can withstand the heat. Plasma stability is not relying on a plasma flow into the expander regions. With a suppressed plasma flow into the expander tanks, a possibility arise for higher electron temperature. A brief presentation will be given on basic theory for the SFLM with plasma stability and electron temperature issues, RF heating computations with sloshing ion formation, neutron transport computations with reactor safety margins and material load estimates, magnetic coil designs as well as a discussion on the implications of the geometry for possible diagnostics. Reactor safety issues are addressed and a vertical orientation of the device could assist passive coolant circulation. Specific attention is put to a device with a 25 m long confinement region and 40 cm plasma radius in the mid-plane. In an optimal case (k{sub eff}= 0.97) with a fusion power of only 10 MW, such a device may be capable of producing a power of 1.5 GW{sub th}.

Agren, O.; Noack, K.; Moiseenko, V. E.; Hagnestal, A.; Kaellne, J.; Anglart, H. [Uppsala University, Angstroem Laboratory, Uppsala University, Box 534, SE-751 21 Uppsala (Sweden); Institute of Plasma Physics, National Science Center 'Kharkiv Institute of Physics and Technology', 61108 Kharkiv (Ukraine); Uppsala University, Angstroem Laboratory, Uppsala University, Box 534, SE-751 21 Uppsala (Sweden); Royal Institute of Technology, Nuclear Reactor Technology, SE 100 44 Stockholm (Sweden)

2012-06-19T23:59:59.000Z

177

Heating by Optical Absorption and Cooling of High Power Laser Mirrors  

Science Journals Connector (OSTI)

In high power laser system, laser mirror is the core and the most sensitive optical component, which influences the increase of laser power and the quality of laser. Absorption of light at mirrors causes wavef...

Ci-Ming Zhou; Zu-Hai Cheng; Yu-Feng Peng

2003-12-01T23:59:59.000Z

178

Lensless Imaging of Magnetic Nanostructures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lensless Imaging of Magnetic Lensless Imaging of Magnetic Nanostructures Lensless Imaging of Magnetic Nanostructures Print Wednesday, 28 March 2012 00:00 Magnetism is useful for many devices and techniques, from electric motors and computer hard drives to magnetic resonance imaging used in medicine. By studying the basics of magnetism, scientists aim to better understand the fundamental physical principles that govern magnetic systems, perhaps leading to important new technologies. The high brightness and coherence of the ALS's soft x-rays have enabled scientists to apply lensless x-ray imaging for the first time to nanometer-scale magnetic structures in an alloy. Many Ways To See You open your eyes and detect the light rays streaming through your bedroom window (transmission), illuminating your socks on the floor (scattering). You put on your glasses (refraction) to detect the state of your image in the mirror (reflection). If you are an ALS scientist, perhaps you go to work and shine some x-ray light on a crystal to detect the arrangement of the atoms in the crystal (diffraction). Now, thanks to Turner et al., you can also shine some x-ray light on a magnetic sample to detect the arrangement of its electron spins through a method known as lensless imaging. This last example is an equally valid way to "see," but instead of using windows, lenses, or mirrors to manipulate light and construct an image, mathematical formulas are used to describe the effects that particles and fields in the sample have on the light. These formulas have always contained terms that relate to the electron spin of magnetic atoms, but they were previously ignored. Using the full formula allows for the determination of not only crystal structure, but magnetic spin distribution and orientation as well, with a spatial resolution limited only by the wavelength of x-rays used. This promising method can be used at any coherent light source, including modern x-ray free-electron lasers, where ultrashort pulses would freeze-frame magnetic changes, offering the potential for imaging in unprecedented detail the structure and motion of boundaries between regions with different magnetic orientation.

179

A KB-Focusing Mirror Pair for a VUV-Raman Spectrometer at FLASH - Mirror Metrology and Ray Tracing Results  

SciTech Connect (OSTI)

A plane mirror and two strongly curved plane elliptical mirrors comprising the refocusing system downstream the plane grating monochromator at FLASH in DESY have been characterized with the Nanometer Optical Component Measuring Machine at the BESSY-II Optics Laboratory of the Helmholtz Zentrum Berlin. Based on the measurement results the two elliptical cylinders were optimized by deterministic surface finishing technology (Ion Beam Finishing). The expected focusing performance was verified by ray tracings after each ion beam finish iteration using the measured topography results.

Siewert, Frank [Helmholtz Zentrum Berlin / BESSY II, Albert-Einstein-Str. 15, D-12489 Berlin (Germany); Reininger, Ruben [Scientific Answers and Solutions, 77 Constantine Way, Mount Sinai, NY 11766 (United States); Ruebhausen, Michael A. [CFEL, Center for Free Electron Laser Science, Notkestr. 15, 20355 Hamburg (Germany)

2010-06-23T23:59:59.000Z

180

Mirror thermal noise in laser interferometer gravitational wave detectors operating at room and cryogenic temperature  

E-Print Network [OSTI]

Mirror thermal noise is and will remain one of the main limitations to the sensitivity of gravitational wave detectors based on laser interferometers. We report about projected mirror thermal noise due to losses in the mirror coatings and substrates. The evaluation includes all kind of thermal noises presently known. Several of the envisaged substrate and coating materials are considered. The results for mirrors operated at room temperature and at cryogenic temperature are reported.

Janyce Franc; Nazario Morgado; Raffaele Flaminio; Ronny Nawrodt; Iain Martin; Liam Cunningham; Alan Cumming; Sheila Rowan; James Hough

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Rhodium coated mirrors deposited by magnetron sputtering for fusion applications  

SciTech Connect (OSTI)

Metallic mirrors will be essential components of all optical spectroscopy and imaging systems for ITER plasma diagnostics. Any change in the mirror performance, in particular, its reflectivity, due to erosion of the surface by charge exchange neutrals or deposition of impurities will influence the quality and reliability of the detected signals. Due to its high reflectivity in the visible wavelength range and its low sputtering yield, rhodium appears as an attractive material for first mirrors in ITER. However, the very high price of the raw material calls for using it in the form of a film deposited onto metallic substrates. The development of a reliable technique for the preparation of high reflectivity rhodium films is therefore of the highest importance. Rhodium layers with thicknesses of up to 2 {mu}m were produced on different substrates of interest (Mo, stainless steel, Cu) by magnetron sputtering. Produced films exhibit a low roughness and crystallite size of about 10 nm with a dense columnar structure. No impurities were detected on the surface after deposition. Scratch tests demonstrate that adhesion properties increase with substrate hardness. Detailed optical characterizations of Rh-coated mirrors as well as results of erosion tests performed both under laboratory conditions and in the TEXTOR tokamak are presented in this paper.

Marot, L.; De Temmerman, G.; Oelhafen, P.; Covarel, G.; Litnovsky, A. [Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland); Laboratoire Mecanique, Materiaux et Procedes de Fabrication, 61 rue Albert Camus, Universite de Haute-Alsace, F-68093 Mulhouse Cedex (France); Institut fuer Energieforschung (Plasmaphysik), Forschungszentrum Juelich, Association EURATOM-FZJ, D 52425 Juelich (Germany)

2007-10-15T23:59:59.000Z

182

Complex multiplication, rationality and mirror symmetry for abelian varieties  

E-Print Network [OSTI]

We show that complex multiplication on abelian varieties is equivalent to the existence of a constant rational K\\"ahler metric. We give a sufficient condition for a mirror of an abelian variety of CM-type to be of CM-type as well. We also study the relationship between complex multiplication and rationality of a toroidal lattice vertex algebra.

Meng Chen

2005-12-20T23:59:59.000Z

183

Phase effects owing to multilayer coatings in a two-mirror extreme-ultraviolet Schwarzschild objective  

E-Print Network [OSTI]

Phase effects owing to multilayer coatings in a two-mirror extreme-ultraviolet Schwarzschild effects in the two-mirror Schwarzschild objective with point diffraction interferometry. The chromatic the interferometry data on the two-mirror optical system are compared with previously reported coating properties

184

Technical NoteFEASIBILITY STUDIES OF ALPHA-PARTICLE CHANNELING IN MIRROR MACHINES  

E-Print Network [OSTI]

Technical NoteFEASIBILITY STUDIES OF ALPHA-PARTICLE CHANNELING IN MIRROR MACHINES A. I. ZHMOGINOV such as mirror machines can benefit this concept by efficiently redirecting a-particle energy to fuel ion heating designs and for proof-of-principle experiments. KEYWORDS: alpha channeling, mirror machines, ray tracing

185

Metal multilayer mirrors for EUV wide field telescopes  

SciTech Connect (OSTI)

Metal multilayer mirrors have been designed for the ALEXIS satellite, which is to carry six wide field telescopes to perform an all-sky survey in three or four narrow wavelength bands in the EUV. Comprised of alternating layers of molybdenum and silicon, the mirrors are optimized to provide maximum reflectivity at angles from 11.5 to 17/degree/ off normal incidence and at wavelengths of 133, 171, or 186A. Simultaneously, the mirrors use a ''wavetrap'' described below to suppress reflectivity at 304A, where the extremely strong geocoronal line of He II causes severe background problems. Low reflectivity at 304A is achieved by superposing two layer pairs that provide destructive interference with an effective 2d spacing of 152A. The Mo layers in this wavetrap must be very thin, about 10A each, in order to allow the shorter wavelengths desired for peak reflectivity to penetrate without significant attenuation. Because refraction changes the effective angle of passage through the wavetrap, a joint optimization between layer thicknesses in the deep layers and the wavetrap layers must be performed for each target peak wavelength. For the 186A mirror, the optimum design from substrate upward is 40 layer pairs, each 74A Si and 31A Mo, followed by 2 layer pairs, each 55A Si and 10A Mo. Calculations predict this design will have a peak reflectivity at 186A of 35 percent and a 304A reflectivity less than 10/sup /minus/5/, if available optical constants are correct and the multilayer can be fabricated without difficulty. We will present details of the calculations and laboratory measurements of the reflectivity performance attained with prototype mirrors. 6 refs., 2 figs.

Smith, B.W.; Bloch, J.J.; Roussel-Dupre,D.

1989-01-01T23:59:59.000Z

186

Lensless Imaging of Magnetic Nanostructures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lensless Imaging of Magnetic Nanostructures Print Lensless Imaging of Magnetic Nanostructures Print Magnetism is useful for many devices and techniques, from electric motors and computer hard drives to magnetic resonance imaging used in medicine. By studying the basics of magnetism, scientists aim to better understand the fundamental physical principles that govern magnetic systems, perhaps leading to important new technologies. The high brightness and coherence of the ALS's soft x-rays have enabled scientists to apply lensless x-ray imaging for the first time to nanometer-scale magnetic structures in an alloy. Many Ways To See You open your eyes and detect the light rays streaming through your bedroom window (transmission), illuminating your socks on the floor (scattering). You put on your glasses (refraction) to detect the state of your image in the mirror (reflection). If you are an ALS scientist, perhaps you go to work and shine some x-ray light on a crystal to detect the arrangement of the atoms in the crystal (diffraction). Now, thanks to Turner et al., you can also shine some x-ray light on a magnetic sample to detect the arrangement of its electron spins through a method known as lensless imaging. This last example is an equally valid way to "see," but instead of using windows, lenses, or mirrors to manipulate light and construct an image, mathematical formulas are used to describe the effects that particles and fields in the sample have on the light. These formulas have always contained terms that relate to the electron spin of magnetic atoms, but they were previously ignored. Using the full formula allows for the determination of not only crystal structure, but magnetic spin distribution and orientation as well, with a spatial resolution limited only by the wavelength of x-rays used. This promising method can be used at any coherent light source, including modern x-ray free-electron lasers, where ultrashort pulses would freeze-frame magnetic changes, offering the potential for imaging in unprecedented detail the structure and motion of boundaries between regions with different magnetic orientation.

187

Lensless Imaging of Magnetic Nanostructures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lensless Imaging of Magnetic Nanostructures Print Lensless Imaging of Magnetic Nanostructures Print Magnetism is useful for many devices and techniques, from electric motors and computer hard drives to magnetic resonance imaging used in medicine. By studying the basics of magnetism, scientists aim to better understand the fundamental physical principles that govern magnetic systems, perhaps leading to important new technologies. The high brightness and coherence of the ALS's soft x-rays have enabled scientists to apply lensless x-ray imaging for the first time to nanometer-scale magnetic structures in an alloy. Many Ways To See You open your eyes and detect the light rays streaming through your bedroom window (transmission), illuminating your socks on the floor (scattering). You put on your glasses (refraction) to detect the state of your image in the mirror (reflection). If you are an ALS scientist, perhaps you go to work and shine some x-ray light on a crystal to detect the arrangement of the atoms in the crystal (diffraction). Now, thanks to Turner et al., you can also shine some x-ray light on a magnetic sample to detect the arrangement of its electron spins through a method known as lensless imaging. This last example is an equally valid way to "see," but instead of using windows, lenses, or mirrors to manipulate light and construct an image, mathematical formulas are used to describe the effects that particles and fields in the sample have on the light. These formulas have always contained terms that relate to the electron spin of magnetic atoms, but they were previously ignored. Using the full formula allows for the determination of not only crystal structure, but magnetic spin distribution and orientation as well, with a spatial resolution limited only by the wavelength of x-rays used. This promising method can be used at any coherent light source, including modern x-ray free-electron lasers, where ultrashort pulses would freeze-frame magnetic changes, offering the potential for imaging in unprecedented detail the structure and motion of boundaries between regions with different magnetic orientation.

188

Lensless Imaging of Magnetic Nanostructures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lensless Imaging of Magnetic Nanostructures Print Lensless Imaging of Magnetic Nanostructures Print Magnetism is useful for many devices and techniques, from electric motors and computer hard drives to magnetic resonance imaging used in medicine. By studying the basics of magnetism, scientists aim to better understand the fundamental physical principles that govern magnetic systems, perhaps leading to important new technologies. The high brightness and coherence of the ALS's soft x-rays have enabled scientists to apply lensless x-ray imaging for the first time to nanometer-scale magnetic structures in an alloy. Many Ways To See You open your eyes and detect the light rays streaming through your bedroom window (transmission), illuminating your socks on the floor (scattering). You put on your glasses (refraction) to detect the state of your image in the mirror (reflection). If you are an ALS scientist, perhaps you go to work and shine some x-ray light on a crystal to detect the arrangement of the atoms in the crystal (diffraction). Now, thanks to Turner et al., you can also shine some x-ray light on a magnetic sample to detect the arrangement of its electron spins through a method known as lensless imaging. This last example is an equally valid way to "see," but instead of using windows, lenses, or mirrors to manipulate light and construct an image, mathematical formulas are used to describe the effects that particles and fields in the sample have on the light. These formulas have always contained terms that relate to the electron spin of magnetic atoms, but they were previously ignored. Using the full formula allows for the determination of not only crystal structure, but magnetic spin distribution and orientation as well, with a spatial resolution limited only by the wavelength of x-rays used. This promising method can be used at any coherent light source, including modern x-ray free-electron lasers, where ultrashort pulses would freeze-frame magnetic changes, offering the potential for imaging in unprecedented detail the structure and motion of boundaries between regions with different magnetic orientation.

189

Lensless Imaging of Magnetic Nanostructures  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lensless Imaging of Magnetic Nanostructures Print Lensless Imaging of Magnetic Nanostructures Print Magnetism is useful for many devices and techniques, from electric motors and computer hard drives to magnetic resonance imaging used in medicine. By studying the basics of magnetism, scientists aim to better understand the fundamental physical principles that govern magnetic systems, perhaps leading to important new technologies. The high brightness and coherence of the ALS's soft x-rays have enabled scientists to apply lensless x-ray imaging for the first time to nanometer-scale magnetic structures in an alloy. Many Ways To See You open your eyes and detect the light rays streaming through your bedroom window (transmission), illuminating your socks on the floor (scattering). You put on your glasses (refraction) to detect the state of your image in the mirror (reflection). If you are an ALS scientist, perhaps you go to work and shine some x-ray light on a crystal to detect the arrangement of the atoms in the crystal (diffraction). Now, thanks to Turner et al., you can also shine some x-ray light on a magnetic sample to detect the arrangement of its electron spins through a method known as lensless imaging. This last example is an equally valid way to "see," but instead of using windows, lenses, or mirrors to manipulate light and construct an image, mathematical formulas are used to describe the effects that particles and fields in the sample have on the light. These formulas have always contained terms that relate to the electron spin of magnetic atoms, but they were previously ignored. Using the full formula allows for the determination of not only crystal structure, but magnetic spin distribution and orientation as well, with a spatial resolution limited only by the wavelength of x-rays used. This promising method can be used at any coherent light source, including modern x-ray free-electron lasers, where ultrashort pulses would freeze-frame magnetic changes, offering the potential for imaging in unprecedented detail the structure and motion of boundaries between regions with different magnetic orientation.

190

Focussing of synchroton radiation X-ray beams using synthetic multilayer mirrors  

Science Journals Connector (OSTI)

A two multilayer X-ray mirror system has been developed to focus 8 keV X-rays from a synchrotron X-ray source. The system uses a Kirkpatrick-Baez mirror geometry and the mirrors are made by sputtering carbon and tungsten layers on spherical optical mirror substrates. A focused X-ray spot 40 ?m wide by 10 ?m high was obtained using an 8 keV X-ray beam from a wiggler beamline at the Stanford Synchrotron Radiation Laboratory. Similar mirror systems may be useful for microprobe and small sample experiments using both synchrotron and laboratory sources.

A.C. Thompson; Y. Wu; J.H. Underwood; T.W. Barbee Jr.

1987-01-01T23:59:59.000Z

191

Metal oxide coating on first mirror in fusion reactor with carbon wall  

Science Journals Connector (OSTI)

Abstract The lifetime of diagnostic equipment in a fusion reactor is typically very short. The first mirror used to reflect optical signals for diagnostics plays a crucial role in the reactor, and it is highly important to develop a more durable first mirror which can survive in the hostile environment. In this work, by conducting electron beam deposition on molybdenum substrates, metallic oxide mirrors are prepared and studied in the simulated environment. The multi-layered metal oxide mirror exhibits much higher reflectivity than the original molybdenum one and the in situ technique to monitor the performance of the first mirror is developed and described.

Xirui Hou; Zhengwei Wu; Paul K. Chu

2014-01-01T23:59:59.000Z

192

Lasers without Mirrors, Designed by Supercomputer - NERSC SCience News  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lasers without Lasers without Mirrors, Designed by Supercomputer Lasers without Mirrors, Designed by Supercomputer October 14, 2009 | Tags: Lasers, Life Sciences, Materials Science Contact: Ji Qiang | Lawrence Berkeley National Laboratory | JQiang@lbl.gov John Corlett | Lawrence Berkeley National Laboratory, Center for Beam Physics | JNCorlett@lbl.gov Sometimes it takes a big machine to understand the tiniest details. That's the case with free electron lasers (FELs). The powerful X-rays they generate can probe matter directly at the level of atomic interactions and chemical-bond formation, letting scientists observe such phenomena as chemical reactions in trace elements, electric charges in photosynthesis and the structure of microscopic machines. FELs have the potential to

193

Part One: Mirrors; Part Two: Synthesis of Camphor  

E-Print Network [OSTI]

v e r mirrors is regarded as objectionable. Liebig f i r s t noted that s i l v e r could be deposited on glass as a mirror in 1835. He reduced the s i l v e r Silver from the solution of/nitrate i n ammonia with formal dehyde . The f i r... s method of depositing copper on glass i s not as nearly i d e a l as some of the methods of de po s i t i n g silver,owing to the imperfections that are some times caused by the o i l y decomposition product St the phenylhydrazine, the copper i...

Kent, Robert C.

1908-01-01T23:59:59.000Z

194

Mirror fusion. Quarterly report, April-June 1981  

SciTech Connect (OSTI)

The information in each Quarterly is presented in the same sequence as in the Field Work Package Proposal and Authorization System (WPAS) submissions prepared for the U.S. Department of Energy; the main sections are Applied Plasma Physics, Confinement Systems, Development and Technology, and Mirror Fusion Test Facility (Planning and Projects). On occasion, we shall include information pertaining to the LLNL role as Lead Laboratory for the Open Systems Mirror Fusion Program. Each of these sections is introduced by an overall statement of the goals and purposes of the groups reporting in it. As appropriate within each section, statements of the goals of individual programs and projects are followed by articles containing summaries of significant recent activity and descriptive text.

Not Available

1981-09-11T23:59:59.000Z

195

Measurements of Mirror Soiling at a Candidate CSP Site  

Science Journals Connector (OSTI)

Abstract Loss of mirror reflectivity due to soiling at Concentrated Solar Power (CSP) plants is a significant consideration for design and operation of the plant. Increasingly, a bankable case for establishment of a new plant will include an evaluation of the cleanliness of the proposed site in addition to the solar resource assessment. The nature and quantity of atmospheric fallout is site specific and generally has a seasonal cycle. We describe an effort which has been underway for more than a year now for a candidate CSP site cleanliness assessment using dust buckets and loss of reflectivity on mirror samples installed at the site. The loss of reflectivity due to soiling was measured on a monthly cycle using a portable, imaging instrument that was designed and built for this purpose. The design of the instrument is described and typical results are presented.

D.J. Griffith; L. Vhengani; M. Maliage

2014-01-01T23:59:59.000Z

196

Orbit averaged radial buildup code for tandem mirror geometry  

SciTech Connect (OSTI)

The radial Fokker-Planck (RFP) model of A. Futch was modified to treat plasma buildup in the tandem mirror plug and center cell with a self-consistent model (TOARBUC). Two major changes have been made to the original version of this code. First, the center cell is treated as having separate electron and ion confining potentials with the ion potential having the opposite sign of that in a conventional mirror. Second, a two-electron-temperature treatment derived by R. Cohen was included in the present model to allow the plug and center cell to have different T/sub e/'s as observed in the experiment. The following sections explain these changes in greater detail.

Campbell, M.; Futch, A.H.

1981-01-22T23:59:59.000Z

197

The Schwarzschild black hole as a gravitational mirror  

Science Journals Connector (OSTI)

The gravitational field outside of a nonrotating black hole is described using the Schwarzschild metric. The geodesic equations of the Schwarzschild metric are derived and those describing null and circular timelike orbits are discussed. Some numerical solutions of the null geodesic equations are shown. These depict photon trajectories which circle the black hole one or two times and then terminate at their emission points. Thus a sequence of ring?shaped mirror images is produced. An equation which gives the angle between the photons trajectory and the radial direction at the emitter is derived and applied to the numerical solutions. These results serve to illustrate how an observer passes through his or her mirror image at r=3 MG/c 2 as he or she moves toward a Schwarzschild black hole.

W. M. Stuckey

1993-01-01T23:59:59.000Z

198

Summary of results from the Tandem Mirror Experiment (TMX)  

SciTech Connect (OSTI)

This report summarizes results from the successful experimental operation of the Tandem Mirror Experiment (TMX) over the period October 1978 through September 1980. The experimental program, summarized by the DOE milestones given in Table 1-1, had three basic phases: (1) an 8-month checkout period, October 1978 through May 1979; (2) a 6-month initial period of operation, June through November 1979, during which the basic principles of the tandem configuration were demonstrated (i.e., plasma confinement was improved over that of a single-cell mirror); and (3) a 10-month period, December 1979 through September 1980, during which the initial TMX results were corroborated by additional diagnostic measurements and many detailed physics investigations were carried out. This report summarizes the early results, presents results of recent data analysis, and outlines areas of ongoing research and data analysis which will be reported in future journal publications.

Simonen, T.C. (ed.)

1981-02-26T23:59:59.000Z

199

Wave-driven Rotation in Supersonically Rotating Mirrors  

SciTech Connect (OSTI)

Supersonic rotation in mirrors may be produced by radio frequency waves. The waves produce coupled diffusion in ion kinetic and potential energy. A population inversion along the diffusion path then produces rotation. Waves may be designed to exploit a natural kinetic energy source or may provide the rotation energy on their own. Centrifugal traps for fusion and isotope separation may benefit from this wave-driven rotation.

A. Fetterman and N.J. Fisch

2010-02-15T23:59:59.000Z

200

Ray chaos in optical cavities based upon standard laser mirrors  

E-Print Network [OSTI]

We present a composite optical cavity made of standard laser mirrors; the cavity consists of a suitable combination of stable and unstable cavities. In spite of its very open nature the composite cavity shows ray chaos, which may be either soft or hard, depending on the cavity configuration. This opens a new, convenient route for experimental studies of the quantum aspects of a chaotic wave field.

A. Aiello; M. P. van Exter; J. P. Woerdman

2003-07-17T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Magnetic Spinner  

Science Journals Connector (OSTI)

A science toy sometimes called the magnetic spinner is an interesting class demonstration to illustrate the principles of magnetic levitation. It can also be used to demonstrate Faraday's law and a horizontally suspended physical pendulum. The levitated part contains two circular magnets encased in a plastic housing. Each magnet stays above two triangular magnets fixed to the base. The magnetic repulsive force experienced by the circular magnets is independent of their orientation; therefore the holder of these magnets can be rotated without affecting its stability. The holder with the circular magnets can be oscillated up and down as a horizontally suspended physical pendulum.

P. J. Ouseph

2006-01-01T23:59:59.000Z

202

Magnetism Digest  

Science Journals Connector (OSTI)

... and Institute of Electrical and Electronic Engineers, on the occasion of their annual conferences on magnetism and magnetic materials in the United States, have sponsored the production of a Magnetic ... references, drawn from a large number of sources, to work in the field of magnetism and magnetic materials published in the preceding year. They therefore provide a very convenient ...

J. H. PHILLIPS

1966-06-25T23:59:59.000Z

203

Borehole Imaging of In Situ Stress Tests at Mirror Lake Research Site |  

Open Energy Info (EERE)

Borehole Imaging of In Situ Stress Tests at Mirror Lake Research Site Borehole Imaging of In Situ Stress Tests at Mirror Lake Research Site Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: Borehole Imaging of In Situ Stress Tests at Mirror Lake Research Site Author U.S. Geological Survey Published U.S. Geological Survey, 2013 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Borehole Imaging of In Situ Stress Tests at Mirror Lake Research Site Citation U.S. Geological Survey. Borehole Imaging of In Situ Stress Tests at Mirror Lake Research Site [Internet]. 2013. U.S. Geological Survey. [cited 2013/10/16]. Available from: http://water.usgs.gov/ogw/bgas/toxics/ml_bips.html Retrieved from "http://en.openei.org/w/index.php?title=Borehole_Imaging_of_In_Situ_Stress_Tests_at_Mirror_Lake_Research_Site&oldid=688729"

204

On the Compliance of Simbol-X Mirror Roughness with its Effective Area Requirements  

SciTech Connect (OSTI)

Surface microroughness of X-ray mirrors is a key issue for the angular resolution of Simbol-X to comply with the required one (<20 arcsec at 30 keV). The maximum tolerable microroughness for Simbol-X mirrors, in order to satisfy the required imaging capability, has already been derived in terms of its PSD (Power Spectral Density). However, also the Effective Area of the telescope is affected by the mirror roughness. In this work we will show how the expected effective area of the Simbol-X mirror module can be computed from the roughness PSD tolerance, checking its compliance with the requirements.

Spiga, D.; Basso, S.; Cotroneo, V.; Pareschi, G.; Tagliaferri, G. [INAF/Osservatorio Astronomico di Brera-Via Bianchi 46-23807 Merate (Italy)

2009-05-11T23:59:59.000Z

205

Project Profile: Cleanable and Hardcoat Coatings for Increased Durability of Silvered Polymeric Mirrors  

Broader source: Energy.gov [DOE]

3M, under the CSP R&D FOA, is developing optical coatings for solar mirrors that are durable, easily maintained, and more cost-effective.

206

Aplanatic two mirror telescope from near-normal to grazing incidence  

Science Journals Connector (OSTI)

Surface equations for strictly aplanatic two-mirror telescopes of any configuration are given. They were used in a comparative performance analysis of the general Cassegrainian...

Korsch, Dietrich

1980-01-01T23:59:59.000Z

207

Cryogenic far-infrared laser absorptivity measurements of the Herschel Space Observatory telescope mirror coatings  

Science Journals Connector (OSTI)

Far-infrared laser calorimetry was used to measure the absorptivity, and thus the emissivity, of aluminum-coated silicon carbide mirror samples produced during the coating...

Fischer, Jacqueline; Klaassen, Tjeerd; Hovenier, Niels; Jakob, Gerd; Poglitsch, Albrecht; Sternberg, Oren

2004-01-01T23:59:59.000Z

208

E-Print Network 3.0 - automatic mirror alignment Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Reconstruction with Structured Light Emric Epstein, Martin Granger-Piche, and Pierre Poulin Summary: is the alignment (rotations) of the mirror local coordinate system so it lies...

209

Modularity, quaternion-Khler spaces, and mirror symmetry  

SciTech Connect (OSTI)

We provide an explicit twistorial construction of quaternion-Khler manifolds obtained by deformation of c-map spaces and carrying an isometric action of the modular group SL(2,Z). The deformation is not assumed to preserve any continuous isometry and therefore this construction presents a general framework for describing NS5-brane instanton effects in string compactifications with N= 2 supersymmetry. In this context the modular invariant parametrization of twistor lines found in this work yields the complete non-perturbative mirror map between type IIA and type IIB physical fields.

Alexandrov, Sergei; Banerjee, Sibasish [Universit Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier (France)] [Universit Montpellier 2, Laboratoire Charles Coulomb UMR 5221, F-34095 Montpellier (France)

2013-10-15T23:59:59.000Z

210

Neutron - Mirror Neutron Oscillations: How Fast Might They Be?  

E-Print Network [OSTI]

We discuss the phenomenological implications of the neutron (n) oscillation into the mirror neutron (n'), a hypothetical particle exactly degenerate in mass with the neutron but sterile to normal matter. We show that the present experimental data allow a maximal n-n' oscillation in vacuum with a characteristic time $\\tau$ much shorter than the neutron lifetime, in fact as small as 1 sec. This phenomenon may manifest in neutron disappearance and regeneration experiments perfectly accessible to present experimental capabilities and may also have interesting astrophysical consequences, in particular for the propagation of ultra high energy cosmic rays.

Zurab Berezhiani; Luis Bento

2005-07-03T23:59:59.000Z

211

Using the uncharged Kerr black hole as a gravitational mirror  

E-Print Network [OSTI]

We extend the study of the possibility to use the Schwarzschild black hole as a gravitational mirror to the more general case of an uncharged Kerr black hole. We use the null geodesic equation in the equatorial plane to prove a theorem concerning the conditions the impact parameter has to satisfy if there shall exist boomerang photons. We derive an equation for these boomerang photons and an equation for the emission angle. Finally, the radial null geodesic equation is integrated numerically in order to illustrate boomerang photons.

Cramer, C R

1995-01-01T23:59:59.000Z

212

Using the Uncharged Kerr Black Hole as a Gravitational Mirror  

E-Print Network [OSTI]

We extend the study of the possibility to use the Schwarzschild black hole as a gravitational mirror to the more general case of an uncharged Kerr black hole. We use the null geodesic equation in the equatorial plane to prove a theorem concerning the conditions the impact parameter has to satisfy if there shall exist boomerang photons. We derive an equation for these boomerang photons and an equation for the emission angle. Finally, the radial null geodesic equation is integrated numerically in order to illustrate boomerang photons.

Claes R Cramer

1995-10-25T23:59:59.000Z

213

3d mirror symmetry as a canonical transformation  

E-Print Network [OSTI]

We generalize the free Fermi-gas formulation of certain 3d ${\\cal N}=3$ supersymmetric Chern-Simons-matter theories by allowing Fayet-Iliopoulos couplings as well as mass terms for bifundamental matter fields. The resulting partition functions are given by simple modifications of the argument of the Airy function found previously. With these extra parameters it is easy to see that mirror-symmetry corresponds to linear canonical transformations on the phase space (or operator algebra) of the 1-dimensional fermions.

Drukker, Nadav

2015-01-01T23:59:59.000Z

214

Conifold singularities, resumming instantons and non-perturbative mirror symmetry  

E-Print Network [OSTI]

We determine the instanton corrected hypermultiplet moduli space in type IIB compactifications near a Calabi-Yau conifold point where the size of a two-cycle shrinks to zero. We show that D1-instantons resolve the conifold singularity caused by worldsheet instantons. Furthermore, by resumming the instanton series, we reproduce exactly the results obtained by Ooguri and Vafa on the type IIA side, where membrane instantons correct the hypermultiplet moduli space. Our calculations therefore establish that mirror symmetry holds non-perturbatively in the string coupling.

Frank Saueressig; Stefan Vandoren

2007-04-26T23:59:59.000Z

215

TEST RESULTS OF HTS COILS AND AN R AND D MAGNET FOR RIA.  

SciTech Connect (OSTI)

This paper presents the successful construction and test results of a magnetic mirror model for the Rare Isotope Accelerator (RIA) that is based on High Temperature Superconductors (HTS). In addition, the performance of thirteen coils (each made with {approx}220 meters of commercially available HTS tape) is also presented. The proposed HTS magnet is a crucial part of the R&D for the Fragment Separator region where the magnets are subjected to several orders of magnitude more radiation and energy deposition than typical beam line and accelerator magnets receive during their entire lifetime. A preliminary design of an HTS dipole magnet for the Fragment Separator region is also presented.

GUPTA, R.; ANERELLA, M.; HARRISON, M.; SCHMALZLE, J.; SAMPSON, W.; ZELLER, A.

2005-05-16T23:59:59.000Z

216

Summary of Thomson-scattering data from the Tandem Mirror Experiment (TMX)  

SciTech Connect (OSTI)

We provide a synthesis of our Thomson-scattering measurements of electron temperature (T/sub e/) and density (n/sub e/) for the Tandem Mirror Experiment (TMX). TMX operated in two modes - high and low T/sub e/. When performing in the high T/sub e/ mode (in general > 100 eV), heating the central-cell ions with neutral beams raised T/sub e/ in the end plug. We achieved a maximum T/sub e/ of 260 eV in the east end plug. Specifically, our experiments demonstrated that in the end plug, the radial T/sub e/ profiles were flat to r = 5 cm; the ratio of potential (phi/sub p/) to T/sub e/ ranged between four and six. In addition, we found that although T/sub e/ in the central cell was generally comparable to that in the plug, it was often not constant along a magnetic field line. Under some conditions a non-Maxwellian electron distribution may have been present.

Goodman, R.K.

1982-01-11T23:59:59.000Z

217

An optically trapped mirror for reaching the standard quantum limit  

E-Print Network [OSTI]

The preparation of a mechanical oscillator driven by quantum back-action is a fundamental requirement to reach the standard quantum limit (SQL) for force measurement, in optomechanical systems. However, thermal fluctuating force generally dominates a disturbance on the oscillator. In the macroscopic scale, an optical linear cavity including a suspended mirror has been used for the weak force measurement, such as gravitational-wave detectors. This configuration has the advantages of reducing the dissipation of the pendulum (i.e., suspension thermal noise) due to a gravitational dilution by using a thin wire, and of increasing the circulating laser power. However, the use of the thin wire is weak for an optical torsional anti-spring effect in the cavity, due to the low mechanical restoring force of the wire. Thus, there is the trade-off between the stability of the system and the sensitivity. Here, we describe using a triangular optical cavity to overcome this limitation for reaching the SQL. The triangular cavity can provide a sensitive and stable system, because it can optically trap the mirror's motion of the yaw, through an optical positive torsional spring effect. To show this, we demonstrate a measurement of the torsional spring effect caused by radiation pressure forces.

Nobuyuki Matsumoto; Yuta Michimura; Yoichi Aso; Kimio Tsubono

2014-05-19T23:59:59.000Z

218

The ASTRI SST-2M Prototype: Structure and Mirror  

E-Print Network [OSTI]

The next generation of IACT (Imaging Atmospheric Cherenkov Telescope) will explore the uppermost end of the VHE (Very High Energy) domain up to about few hundreds of TeV with unprecedented sensibility, angular resolution and imaging quality. To this end, INAF (Italian National Institute of Astrophysics) is currently developing a scientific and technological telescope prototype for the implementation of the CTA (Cherenkov Telescope Array) observatory. ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) foresees the full design, development, installation and calibration of a Small Size 4 meter class Telescope. The telescope, named SST-2M, is based on an aplanatic, wide field, double reflection optical layout in a Schwarzschild-Couder configuration. In this paper we report about the technological solutions adopted for the telescope and for the mirrors. In particular the structural and electro-mechanical design of the telescope and the results on the optical performance derived after the development of a prototype of the segments that will be assembled to form the primary mirror.

Rodolfo Canestrari; Osvaldo Catalano; Mauro Fiorini; Enrico Giro; Nicola La Palombara; Giovanni Pareschi; Luca Stringhetti; Gino Tosti; Stefano Vercellone; for the ASTRI Collaboration; Francesco Martelli; Giancarlo Parodi; Pierfrancesco Rossettini; Raffaele Tomelleri

2013-07-18T23:59:59.000Z

219

Magnetism.1  

Science Journals Connector (OSTI)

... each complete magnets with a pair of poles. The general character of the earth's magnetism has long been knownthat the earth behaves with regard to magnets as though it ... and that these poles have a slow secular motion. For many years the earth's magnetism has been the subject of careful study by the most powerful minds. Gauss organized ...

1890-01-16T23:59:59.000Z

220

GDT-based neutron source with multiple-mirror end plugs  

SciTech Connect (OSTI)

We present a new linear trap to be built at the Budker Institute. It combines gasdynamictype central cell with sloshing ions for beam fusion and the multiple-mirror end plugs for improved axial confinement. Thus it is designed as an efficient neutron source and a testbed for future development of mirror-based fusion reactors.

Beklemishev, A.; Anikeev, A.; Burdakov, A.; Ivanov, A.; Ivanov, I.; Postupaev, V.; Sinitsky, S. [Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)

2012-06-19T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Photo-patterning micro-mirror devices using azo dye-doped cholesteric liquid crystals  

E-Print Network [OSTI]

Photo-patterning micro-mirror devices using azo dye-doped cholesteric liquid crystals Tsung: A simple method for fabricating patternable micro-mirror devices by photo-induced alignment of dye to nearly perfect planar by the photo-excited adsorbed dyes. This structure transformation leads

Wu, Shin-Tson

222

Design study of 8 meter monolithic mirror UV/optical space telescope H. Philip Stahl  

E-Print Network [OSTI]

Design study of 8 meter monolithic mirror UV/optical space telescope H. Philip Stahl NASA Marshall Space Flight Center, Huntsville, AL 35812 ABSTRACT The planned Ares V launch vehicle with its 10 meter to 8 meter class monolithic primary mirror telescope to Sun-Earth L2 using an Ares V. Specific

Sirianni, Marco

223

Planar Gold Nanoparticle Clusters as Microscale Mirrors Jin Young Kim and Frank E. Osterloh*  

E-Print Network [OSTI]

Planar Gold Nanoparticle Clusters as Microscale Mirrors Jin Young Kim and Frank E. Osterloh,4,5 In extension of our work on nanoparticle-based waveguides,6-9 we report here a scalable chemical synthesis of micrometer-scale mirrors based on Au nanoparticles and Ca2Nb3O10 nanoplates. Similar to their macroscale

Osterloh, Frank

224

Extreme ultraviolet carrier-frequency shearing interferometry of a lithographic four-mirror optical system  

E-Print Network [OSTI]

Extreme ultraviolet carrier-frequency shearing interferometry of a lithographic four-mirror optical of an EUV Schwarzschild objective.13 Direct comparison of this LSI to the PS/PDI has demon- strated a root-grating, carrier- frequency LSI for testing a lithographic four-mirror EUV optical system. The tests were performed

225

Doppler Effect Associated with the Reflection of Light on a Moving Mirror  

E-Print Network [OSTI]

The Doppler Effect associated with the reflection on a moving mirror is reduced to two Doppler Effect experiments involving the incoming incident ray and the outgoing reflected ray or vice-versa. The dependence of the corresponding Doppler factors on the incidence angle on the stationary mirror.

Bernhard Rothenstein; Ioan Damian

2005-08-18T23:59:59.000Z

226

The Icon of God and the Mirror of the Soul: Exploring the Origins of Iconography in Patristic Writing  

E-Print Network [OSTI]

face to face. The icon, therefore, is closely interrelatedTHE ICON OF GOD AND THE MIRROR OF THE SOUL: EXPLORING THEby Andreas Andreopoulos The icon is also a mirror, fashioned

Andreopoulos, Andreas

2000-01-01T23:59:59.000Z

227

Broadband extreme ultraviolet multilayer mirror for supercontinuum light at a photon energy of 35-65 eV  

Science Journals Connector (OSTI)

We have developed a broadband multilayer mirror for photon energies between 35 and 65 eV. This extreme ultraviolet (EUV) mirror has an almost flat reflectivity profile at normal...

Hatayama, Masatoshi; Takenaka, Hisataka; Gullikson, Eric M; Suda, Akira; Midorikawa, Katsumi

2009-01-01T23:59:59.000Z

228

Earths magnetism  

Science Journals Connector (OSTI)

Earths magnetism, geomagnetism, terrestrial magnetism [The magnetism of the Earth] ? Erdmagnetismus m, Geomagnetismus

2014-08-01T23:59:59.000Z

229

Opto-thermal analysis of a lightweighted mirror for solar telescope  

E-Print Network [OSTI]

In this paper, an opto-thermal analysis of a moderately heated lightweighted solar telescope mirror is carried out using 3D finite element analysis (FEA). A physically realistic heat transfer model is developed to account for the radiative heating and energy exchange of the mirror with surroundings. The numerical simulations show the non-uniform temperature distribution and associated thermo-elastic distortions of the mirror blank clearly mimicking the underlying discrete geometry of the lightweighted substrate. The computed mechanical deformation data is analyzed with surface polynomials and the optical quality of the mirror is evaluated with the help of a ray-tracing software. The thermal print-through distortions are further shown to contribute to optical figure changes and mid-spatial frequency errors of the mirror surface. A comparative study presented for three commonly used substrate materials, namely, Zerodur, Pyrex and Silicon Carbide (SiC) is relevant to vast area of large optics requirements in gro...

Banyal, Ravinder K; Chatterjee, S

2013-01-01T23:59:59.000Z

230

Performance of an optimally contact-cooled high-heat-load mirror at the APS.  

SciTech Connect (OSTI)

X-ray undulator beamlines at third-generation synchrotrons facilities use either a monochromator or a mirror as the first optical element. In this paper, the thermal and optical performance of an optimally designed contact-cooled high-heat-load x-ray mirror used as the first optical element on the 2ID undulator beamline at the Advanced Photon Source (APS) is reported. It is shown that this simple and economical mirror design can comfortably handle the high heat load of undulator beamlines and provide good performance with long-term reliability and ease of operation. Availability and advantages of such mirrors can make the mirror-first approach to high-heat-load beamline design an attractive alternative to monochromator-first beamlines in many circumstances.

Cai, Z.; Khounsary, A.; Lai, B.; McNulty, I.; Yun, W.

1998-11-18T23:59:59.000Z

231

Scattering of Magnetic Mirror Trapped Fast Electrons by a Shear Alfven Wave Yuhou Wang,1  

E-Print Network [OSTI]

of energetic electrons by naturally driven chorus and broadband hiss. Pitch-angle scattering can also occur with an intense electron flux, and it took almost 10 years before the natural dynamic equilibrium of the radiation of energetic electrons in the inner radiation belt. DOI: 10.1103/PhysRevLett.108.105002 PACS numbers: 52.40.Db

California at Los Angles, University of

232

On the feasibility of electron cyclotron heating of overcritical plasma in a magnetic mirror trap  

Science Journals Connector (OSTI)

The feasibility of matching electromagnetic radiation in the electron cyclotron frequency range to a dense plasma in ... profile shows promise for the implementation of efficient cyclotron heating at plasma densi...

A. V. Vodopyanov; S. V. Golubev; E. D. Gospodchikov

2012-06-01T23:59:59.000Z

233

All solid-state SBS phase conjugate mirror  

DOE Patents [OSTI]

A stimulated Brillouin scattering (SBS) phase conjugate laser mirror uses a solid-state nonlinear gain medium instead of the conventional liquid or high pressure gas medium. The concept has been effectively demonstrated using common optical-grade fused silica. An energy threshold of 2.5 mJ and a slope efficiency of over 90% were achieved, resulting in an overall energy reflectivity of >80% for 15 ns, 1 um laser pulses. The use of solid-state materials is enabled by a multi-pass resonant architecture which suppresses transient fluctuations that would otherwise result in damage to the SBS medium. This all solid state phase conjugator is safer, more reliable, and more easily manufactured than prior art designs. It allows nonlinear wavefront correction to be implemented in industrial and defense laser systems whose operating environments would preclude the introduction of potentially hazardous liquids or high pressure gases. 8 figs.

Dane, C.B.; Hackel, L.A.

1999-03-09T23:59:59.000Z

234

Calculation of density profiles in tandem mirrors fueled by pellets  

SciTech Connect (OSTI)

We have modified the LLNL radial transport code TMT to model reactor regime plasmas, fueled by pellets. The source profiles arising from pellet fueling are obtained from existing pellet ablation models. Because inward radial diffusion due to inverted profiles must compete with trapping of central cell ions in the transition region for tandem mirrors, pellets must penetrate fairly far into the plasma. In fact, based on our radial calculations, a pellet with a velocity of 10 km/sec cannot sustain the central flux tubes; a velocity more like 100 km/sec will be necessary. We also find that the central cell radial diffusion must exceed classical by about a factor of 100.

Campbell, R.B.; Gilmore, J.M.

1983-12-02T23:59:59.000Z

235

Moving Mirrors, Black Holes, Hawking Radiation and All That  

E-Print Network [OSTI]

In this talk I show how to canonically quantize a massless scalar field in the background of a Schwarzschild black hole in Lema\\^itre coordinates and then present a simplified derivation of Hawking radiation based upon this procedure. The key result of quantization procedure is that the Hamiltonian of the system is explicitly time dependent and so problem is intrinsically non-static. From this it follows that, although a unitary time-development operator exists, it is not useful to talk about vacuum states; rather, one should focus attention on steady state phenomena such as the Hawking radiation. In order to clarify the approximations used to study this problem I begin by discussing the related problem of the massless scalar field theory calculated in the presence of a moving mirror.

Marvin Weinstein

2001-11-09T23:59:59.000Z

236

The ASTRI SST-2M Prototype: Structure and Mirror  

E-Print Network [OSTI]

The next generation of IACT (Imaging Atmospheric Cherenkov Telescope) will explore the uppermost end of the VHE (Very High Energy) domain up to about few hundreds of TeV with unprecedented sensibility, angular resolution and imaging quality. To this end, INAF (Italian National Institute of Astrophysics) is currently developing a scientific and technological telescope prototype for the implementation of the CTA (Cherenkov Telescope Array) observatory. ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana) foresees the full design, development, installation and calibration of a Small Size 4 meter class Telescope. The telescope, named SST-2M, is based on an aplanatic, wide field, double reflection optical layout in a Schwarzschild-Couder configuration. In this paper we report about the technological solutions adopted for the telescope and for the mirrors. In particular the structural and electro-mechanical design of the telescope and the results on the optical performance derived after the development ...

Canestrari, Rodolfo; Fiorini, Mauro; Giro, Enrico; La Palombara, Nicola; Pareschi, Giovanni; Stringhetti, Luca; Tosti, Gino; Vercellone, Stefano; Martelli, Francesco; Parodi, Giancarlo; Rossettini, Pierfrancesco; Tomelleri, Raffaele

2013-01-01T23:59:59.000Z

237

Moving Mirrors, Black Holes, Hawking Radiation and All That  

E-Print Network [OSTI]

In this talk I show how to canonically quantize a massless scalar field in the background of a Schwarzschild black hole in Lema\\^itre coordinates and then present a simplified derivation of Hawking radiation based upon this procedure. The key result of quantization procedure is that the Hamiltonian of the system is explicitly time dependent and so problem is intrinsically non-static. From this it follows that, although a unitary time-development operator exists, it is not useful to talk about vacuum states; rather, one should focus attention on steady state phenomena such as the Hawking radiation. In order to clarify the approximations used to study this problem I begin by discussing the related problem of the massless scalar field theory calculated in the presence of a moving mirror.

Weinstein, M A

2002-01-01T23:59:59.000Z

238

Moving Mirrors, Black Holes, Hawking Radiation and All That  

SciTech Connect (OSTI)

In this talk I show how, in Lemaitre coordinates, one can canonically quantize a massless scalar field in the background of a Schwarzschild black hole and then show how this leads to a simplified derivation of Hawking radiation. The key result of the canonical quantization procedure is that the Hamiltonian of the system is explicitly time dependent, which immediately shows that the problem is intrinsically non-static and that, although a unitary time-development operator exists, it is not useful to talk about eigenstates. Rather, one should deal with the Heisenberg equations of motion and focus attention on steady state phenomena, such as the Hawking radiation. In order to clarify the procedure used to solve the Heisenberg equations I first discuss the related problem of the massless scalar field theory calculated in the presence of a moving mirror.

Weinstein, Marvin

2001-11-08T23:59:59.000Z

239

Gamma Ray Mirrors for Direct Measurement of Spent Nuclear Fuel  

SciTech Connect (OSTI)

Direct measurement of the amount of Pu and U in spent nuclear fuel represents a challenge for the safeguards community. Ideally, the characteristic gamma-ray emission lines from different isotopes provide an observable suitable for this task. However, these lines are generally lost in the fierce flux of radiation emitted by the fuel. The rates are so high that detector dead times limit measurements to only very small solid angles of the fuel. Only through the use of carefully designed view ports and long dwell times are such measurements possible. Recent advances in multilayer grazing-incidence gamma-ray optics provide one possible means of overcoming this difficulty. With a proper optical and coating design, such optics can serve as a notch filter, passing only narrow regions of the overall spectrum to a fully shielded detector that does not view the spent fuel directly. We report on the design of a mirror system and a number of experimental measurements.

Pivovaroff, Dr. Michael J. [Lawrence Livermore National Laboratory (LLNL)] [Lawrence Livermore National Laboratory (LLNL); Ziock, Klaus-Peter [ORNL] [ORNL; Harrison, Mark J [ORNL] [ORNL; Soufli, Regina [Lawrence Livermore National Laboratory (LLNL)] [Lawrence Livermore National Laboratory (LLNL)

2014-01-01T23:59:59.000Z

240

Development of stressed membrane heliostat mirror module: Final report  

SciTech Connect (OSTI)

The design of a commercial stressed membrane 150 m/sup 2/ heliostat mirror module based on thin .0762 mm (.003 in.) stainless steel is reported. The fabrication and initial evaluations of a 50 m/sup 2/ first of a kind prototype is reported and represents the first proof of principal for this advanced heliostat concept. The baseline design, manufacturing and installation of these vacuum focused double membrane ''thin drum'' heliostats has been established. The results of prototype testing will allow the designs and manufacturing scenarios for these 10.7 kg/m/sup 2/, 2.2 lb/ft/sup 2/, $65/m/sup 2/ heliostats to be refined and installation costs reduced.

Butler, B.L.; Beninga, K.; Loomis, W.C.; Royval, P.J.

1987-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

All solid-state SBS phase conjugate mirror  

DOE Patents [OSTI]

A stimulated Brillouin scattering (SBS) phase conjugate laser mirror uses a solid-state nonlinear gain medium instead of the conventional liquid or high pressure gas medium. The concept has been effectively demonstrated using common optical-grade fused silica. An energy threshold of 2.5 mJ and a slope efficiency of over 90% were achieved, resulting in an overall energy reflectivity of >80% for 15 ns, 1 um laser pulses. The use of solid-state materials is enabled by a multi-pass resonant architecture which suppresses transient fluctuations that would otherwise result in damage to the SBS medium. This all solid state phase conjugator is safer, more reliable, and more easily manufactured than prior art designs. It allows nonlinear wavefront correction to be implemented in industrial and defense laser systems whose operating environments would preclude the introduction of potentially hazardous liquids or high pressure gases.

Dane, Clifford B. (Livermore, CA); Hackel, Lloyd A. (Livermore, CA)

1999-01-01T23:59:59.000Z

242

Economic Mass Producible Mirror Panels for Solar Concentrators G Johnston, G. Burgess, K. Lovegrove and A. Luzzi  

E-Print Network [OSTI]

Economic Mass Producible Mirror Panels for Solar Concentrators G Johnston, G. Burgess, K. Lovegrove to the success of all solar concentrators of this nature are cost effective and durable mirror panel components World Solar Congress 743 #12;Economic Mass Producible Mirror Panels for Solar Concentrators Johnston

243

On the stability of an accretion disc containing a toroidal magnetic field  

Science Journals Connector (OSTI)

......case it is equivalent to Schwarzschild's sufficient condition...magnetic field is added, Schwarzschild's criterion for convection...considering the plane /3=0 as a mirror. We can consider separately...criterion is a generalization of Schwarzschild's criterion. For a non-axisymmetric......

Caroline Terquem; John C. B. Papaloizou

1996-04-01T23:59:59.000Z

244

Modern Magnetism  

Science Journals Connector (OSTI)

... BATESS "Modern Magnetism", first published in 1939, is widely appreciated as a general survey in which ... grateful to the author for collecting together so much interesting information about recent work in magnetism. ...

E. C. S.

1948-06-05T23:59:59.000Z

245

Migratory magnetism  

Science Journals Connector (OSTI)

... in tune with the Earth's magnetic field. But how, exactly, do creatures sense magnetism? This is one of the most intriguing questions in modern biology - and also ... move preferentially in a north-south direction. This finding hints at the possible influence of magnetism on their movements. ...

Henry Gee

1999-10-06T23:59:59.000Z

246

Thermal Barrier Formation and Plasma Confinement in the Axisymmetrized Tandem Mirror GAMMA 10  

Science Journals Connector (OSTI)

In the axisymmetrized tandem mirror GAMMA 10, thermal-barrier and plug potentials have been formed in the axisymmetric mirror cells at both ends and directly measured with Au neutral-beam probes and end-loss analyzers. Strong end-loss reduction associated with the potential formation results in enhancement of the axial particle confinement time 100 times over the mirror confinement time without plugging, in reasonable agreement with Pastukhov formula. An empirical scaling on nonambipolar radial ion confinement time in the axisymmetrized field configuration is presented.

M. Inutake; T. Cho; M. Ichimura; K. Ishii; A. Itakura; I. Katanuma; Y. Kiwamoto; Y. Kusama; A. Mase; S. Miyoshi; Y. Nakashima; T. Saito; A. Sakasai; K. Sawada; I. Wakaida; N. Yamaguchi; K. Yatsu

1985-08-26T23:59:59.000Z

247

Plasma confinement experiments in the TMX tandem mirror. Paper IAEA-CN-38/F-1  

SciTech Connect (OSTI)

Results from the new Tandem Mirror Experiment (TMX) are described. Tandem-mirror density and potential profiles are produced using end-plug neutral-beam injection and central-cell gas-fueling. TMX parameters are near those predicted theoretically. The end-plug electron temperature is higher than in the comparably sized single-mirror 2XIIB. Axial confinement of the finite-beta central-cell plasma is improved by the end plugs by as much as a factor of 9. In TMX, end-plug microinstability limits central-cell confinement in agreement with theory.

Simonen, T.C.; Anderson, C.A.; Casper, T.A.

1980-05-22T23:59:59.000Z

248

TeV Scale Quantum Gravity and Mirror Supernovae as Sources of Gamma Ray Bursts  

E-Print Network [OSTI]

Mirror matter models have been suggested recently as an explanation of neutrino puzzles and microlensing anomalies. We show that mirror supernovae can be a copious source of energetic gamma rays if one assumes that the quantum gravity scale is in the TeV range. We show that under certain assumptions plausible in the mirror models, the gamma energies could be degraded to the 10 MeV range (and perhaps even further) so as to provide an explanation of observed gamma ray bursts. This mechanism for the origin of the gamma ray bursts has the advantage that it neatly avoids the ``baryon load problem''.

R. N. Mohapatra; S. Nussinov; V. L. Teplitz

1999-09-22T23:59:59.000Z

249

Sagnac interferometry as a probe to the commutation relation of a macroscopic quantum mirror  

SciTech Connect (OSTI)

Single photon Sagnac interferometry as a probe to macroscopic quantum mechanics is considered at the theoretical level. For a freely moving macroscopic quantum mirror susceptible to radiation pressure force inside a Sagnac interferometer, a careful analysis of the input-output relation reveals that the particle spectrum readout at the bright and dark ports encode information concerning the noncommutativity of position and momentum of the macroscopic mirror. A feasible experimental scheme to probe the commutation relation of a macroscopic quantum mirror is outlined to explore the possible frontier between classical and quantum regimes. In the Appendix, the case of Michelson interferometry as a feasible probe is also sketched.

Yang Ran; Gong Xuefei; Pei Shouyong; Luo Ziren; Lau, Y. K. [Physics Department, Huazhong University of Science and Technology, Wuhan 430074 (China); Institute of High Energy Physics, Theoretical Physics Center for Science Facilities, Chinese Academy of Sciences, Beijing 100049 (China); Physics Department, Beijing Normal University, Beijing 100875 (China); Institute of Mechanics, Chinese Academy of Sciences, 15, Beisihuanxi road, Beijing 100190 (China); Institute of Applied Mathematics, Academy of Mathematics and System Science, Chinese Academy of Sciences, 55, Zhongguancun Donglu, Beijing 100190 (China)

2010-09-15T23:59:59.000Z

250

Electric and magnetic response to the continuum for A=7 isobars in a dicluster model  

E-Print Network [OSTI]

Mirror isobars $^7$Li and $^7$Be are investigated in a dicluster model. The magnetic dipole moments and the magnetic dipole response to the continuum are calculated in this framework. The magnetic contribution is found to be small with respect to electric dipole and quadrupole excitations even at astrophysical energies, at a variance with the case of deuteron. Energy weighted molecular sum rules are evaluated and a formula for the molecular magnetic dipole sum rule is found which matches the numerical calculations. Cross-sections for photo-dissociation and radiative capture as well as the S-factor for reactions of astrophysical significance are calculated with good agreement with known experimental data.

A. Mason; R. Chatterjee; L. Fortunato; A. Vitturi

2008-11-11T23:59:59.000Z

251

Magnetic Testing of Bonded Magnets  

Science Journals Connector (OSTI)

Many techniques exist to characterize the magnetic properties of bonded magnets. We will review the common and not so common techniques in use, with emphasis on the advantages and disadvantages of each one, an...

S. R. Trout

2003-01-01T23:59:59.000Z

252

Design of a small fast steering mirror for airborne and aerospace applications  

E-Print Network [OSTI]

This thesis presents the analysis and design of a small advanced fast steering mirror (sAFSM) for airborne and aerospace platforms. The sAFSM provides feedback-controlled articulation of two rotational axes for precision ...

Boulet, Michael Thomas

2008-01-01T23:59:59.000Z

253

Microfabrication of Optically Flat Silicon Micro-Mirrors for Fully Programmable Micro-Diffraction Gratings  

E-Print Network [OSTI]

We have fabricated and characterized a Fully Programmable Micro-Diffraction Grating (FPMDG) with 64 silicon micro-mirrors for spectral shaping in the visible and near-infrared wavelength range. The FPMDG arrays of 50 ?m ...

Timotijevic, B.

2012-01-01T23:59:59.000Z

254

Advanced Technology Solar Telescope 4.2 m Off-axis Primary Mirror Fabrication  

Science Journals Connector (OSTI)

Advanced optical surfacing technologies are applied for the Advanced Technology Solar Telescope 4.2 m off-axis primary mirror fabrication. A newly developed Stressed lap and IR...

Kim, Dae Wook; Oh, Chang Jin; Su, Peng; Burge, James H

255

Flexural Stiffnesses of and Dimensional Stability in Circular Quasi-isotropic Laminate Mirrors  

E-Print Network [OSTI]

buffer layers on composite mirrors for high surface smoothness. In this dissertation document, radial stiffness associated with stacking sequence effects in quasi-isotropic laminates (pi/n, where n=3, 4, and 6) and dimensional stability in the composite...

Kim, Kyungpyo

2009-01-01T23:59:59.000Z

256

A DISCUSSION OF HEAT MIRROR FILM: PERFORMANCE, PRODUCTION PROCESS, AND COST ESTIMATES  

E-Print Network [OSTI]

transfer thnough a window by using Intrex film as a heatwindow construction will be PROCESS DESCRIPTION Intrex filmWindows and Lighting Program Building 90, Room 2056 Lawrence Berkeley Laboratory Berkeley, California -ii- A DISCUSSION OF HEAT MIRROR FILM:

Levin, B. P.

2011-01-01T23:59:59.000Z

257

Demonstration of achromatic cold-neutron microscope utilizing axisymmetric focusing mirrors  

E-Print Network [OSTI]

An achromatic cold-neutron microscope with magnification 4 is demonstrated. The image-forming optics is composed of nested coaxial mirrors of full figures of revolution, so-called Wolter optics. The spatial resolution, ...

Liu, Dazhi

258

Brain organization mirrors caste differences, colony founding and nest architecture in paper wasps (Hymenoptera: Vespidae)  

Science Journals Connector (OSTI)

...research-article Research articles 1001 42 14 133 Brain organization mirrors caste differences...social organization and may affect mosaic brain evolution. We asked whether the relative size of functionally distinct brain regions corresponds to species differences...

2009-01-01T23:59:59.000Z

259

E-Print Network 3.0 - asymmetric mirror dark Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

this picture, and (5) the flat mirror at the focal plane. Right image... on the design of Schwarzschild-Chang type telescope. With only two ... Source: Pak, Soojong - Department of...

260

On eikonal distribution in the aperture of a two-mirror telescopic system  

Science Journals Connector (OSTI)

The derivation of the formula describing the eikonal distribution in the aperture of an axially symmetric two-mirror system with the source displaced from the ... of the eikonal in the aperture of a Schwarzschild

A. S. Venetskiy; V. A. Kaloshin

2012-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Anisotropy and crystal orientation of silicon--application to the modeling of a bent mirror  

SciTech Connect (OSTI)

Matrix formula and MATLAB algorithm are proposed to calculate the stiffness coefficient matrix C, the Young's modulus, shear modulus and Poisson ratio for the silicon crystal in any orientation. Results for Si(110) and Si(311) are given as an example. The anisotropic material properties of the silicon have been used in the mirror width profile optimization for the nano-imaging end-station ID22NI at the ESRF. As the Si(110) is used as the substrate of this multilayer coated KB mirror, the silicon crystal axis [0 0 1] is proposed to orient to the mirror axis. This is the case to have low stress in the mirror and low bending forces from actuators.

Zhang Lin [European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex (France)

2010-06-23T23:59:59.000Z

262

On Integration of Mirror Collector and Stirling Engine for Solar Power System  

Science Journals Connector (OSTI)

In the current work, several types of solar collectors, i.e. parabolic, cylindrical, and mirrors, were designed and fabricated. The aim of this study is to integrate the optimum collector with Stirling engine in ...

B.F. Yousif; Ammar Al-Shalabi; Dirk G. Rilling

2011-01-01T23:59:59.000Z

263

Comparison of Fresnel lenses and parabolic mirrors as solar energy concentrators  

Science Journals Connector (OSTI)

This paper compares the gain that can be achieved with a one- or two-stage concentrator, when the first stage is a Fresnel lens or a parabolic mirror, as a function of the luminosity...

Lorenzo, E; Luque, A

1982-01-01T23:59:59.000Z

264

Stimulated Brillouin scattering mirror system, high power laser and laser peening method and system using same  

DOE Patents [OSTI]

A laser system, such as a master oscillator/power amplifier system, comprises a gain medium and a stimulated Brillouin scattering SBS mirror system. The SBS mirror system includes an in situ filtered SBS medium that comprises a compound having a small negative non-linear index of refraction, such as a perfluoro compound. An SBS relay telescope having a telescope focal point includes a baffle at the telescope focal point which blocks off angle beams. A beam splitter is placed between the SBS mirror system and the SBS relay telescope, directing a fraction of the beam to an alternate beam path for an alignment fiducial. The SBS mirror system has a collimated SBS cell and a focused SBS cell. An adjustable attenuator is placed between the collimated SBS cell and the focused SBS cell, by which pulse width of the reflected beam can be adjusted.

Dane, C. Brent (Livermore, CA); Hackel, Lloyd (Livermore, CA); Harris, Fritz B. (Rocklin, CA)

2007-04-24T23:59:59.000Z

265

Method for pulse control in a laser including a stimulated brillouin scattering mirror system  

DOE Patents [OSTI]

A laser system, such as a master oscillator/power amplifier system, comprises a gain medium and a stimulated Brillouin scattering SBS mirror system. The SBS mirror system includes an in situ filtered SBS medium that comprises a compound having a small negative non-linear index of refraction, such as a perfluoro compound. An SBS relay telescope having a telescope focal point includes a baffle at the telescope focal point which blocks off angle beams. A beam splitter is placed between the SBS mirror system and the SBS relay telescope, directing a fraction of the beam to an alternate beam path for an alignment fiducial. The SBS mirror system has a collimated SBS cell and a focused SBS cell. An adjustable attenuator is placed between the collimated SBS cell and the focused SBS cell, by which pulse width of the reflected beam can be adjusted.

Dane, C. Brent (Livermore, CA); Hackel, Lloyd (Livermore, CA); Harris, Fritz B. (Rocklin, CA)

2007-10-23T23:59:59.000Z

266

Measurement of in-service vibration of interior mirrors using virtual laser technique  

Science Journals Connector (OSTI)

The Spanish company IDIADA AT, Santa Oliva (Tarragona), has developed a novel measurement technique that uses a virtual laser technique to quantify in-service vibration levels of interior and exterior mirrors and...

Carlos Grasas; Juan Jesus Garca

2001-10-01T23:59:59.000Z

267

Aerial 3D LED Display by use of Crossed-mirror Array  

Science Journals Connector (OSTI)

In order to realize aerial 3D LED signage, we have fabricated a crossed-mirror array for LEDs. Aerial LED signs have been successfully formed. We have investigated image formation with...

Yamamoto, Hirotsugu

268

Design and shape control of lightweight mirrors for dynamic performance and athermalization  

E-Print Network [OSTI]

The next generation of space telescopes will need to meet increasingly challenging science goals. For these new systems to meet resolution goals, the collecting area of the primary mirror will need to be increased. However, ...

Jordan, Elizabeth (Elizabeth O.)

2007-01-01T23:59:59.000Z

269

Optimal Design of Multilayer Mirrors for Water-Window Microscope Optics  

Science Journals Connector (OSTI)

A small bandwidth of periodic multilayers at wavelengths 2.44.4 nm presents problems for the spectral matching of mirrors. This leads to low throughput of a Schwarzschild microscope and its sensitivity to techno...

Yurii Uspenskii; Denis Burenkov; Tadashi Hatano; Masaki Yamamoto

270

Design and analysis of a two-channel three-mirror x-ray telescope: errata  

Science Journals Connector (OSTI)

Alternate configurations for a two-channel three-mirror glancing incidence x-ray telescope have been designed and evaluated. A Wolter-Schwarzschild type I telescope is used as a base...

Kassim, Abd M; Shealy, David L

1984-01-01T23:59:59.000Z

271

Planar feasibility study for primary mirror control of large imaging space systems using binary actuators  

E-Print Network [OSTI]

The greatest discoveries in astronomy have come with advancements in ground-based observatories and space telescopes. Latest trends in ground-based observatories have been ever increasing size of the primary mirror, providing ...

Lee, Seung Jae, S.M. Massachusetts Institute of Technology

2010-01-01T23:59:59.000Z

272

Performance analysis of Azimuth Tracking Fixed Mirror Solar Concentrator  

Science Journals Connector (OSTI)

Abstract The fixed mirror solar collector (FMSC) fixes reflector and mobiles receiver to collect solar energy. However, this type of concentrator has a low efficiency and short operating duration in practical applications. In this paper, we propose to install the FMSC on an azimuth tracking device (ATFMSC) and the reflectors are arranged by intermission to avoid the shading of neighbor reflector for incidence angle of less than 10 to improve its optical performance. Through the integration of the reflected solar radiation distribution function over any reflection point, and then the whole collector aperture, we develop the analytical expressions of various system efficiencies to numerically simulate the performance of ATFMSC with evacuated tube receiver in different design parameters. It is validated by the ray tracing results. The result shows that the mean annual net heat efficiency of the whole system would be up to 61% with the operating temperature of 400C, which is higher than parabolic trough collector and traditional FMSC. This is because the longitudinal incidence angle of ATFMSC always remains zero by tracking the sun azimuth, so the end loss of the concentrator can be avoided and enables it to operate with high efficiency continually.

Longlong Li; Huairui Li; Qian Xu; Weidong Huang

2015-01-01T23:59:59.000Z

273

Study of fusion product effects in field-reversed mirrors  

SciTech Connect (OSTI)

The effect of fusion products (fps) on Field-Reversed Mirror (FRM) reactor concepts has been evaluated through the development of two new computer models. The first code (MCFRM) treats fps as test particles in a fixed background plasma, which is represented as a fluid. MCFRM includes a Monte Carlo treatment of Coulomb scattering and thus provides an accurate treatment of fp behavior even at lower energies where pitch-angle scattering becomes important. The second code (FRMOD) is a steady-state, globally averaged, two-fluid (ion and electron), point model of the FRM plasma that incorporates fp heating and ash buildup values which are consistent with the MCFRM calculations. These codes have been used extensively in the development of an advanced-fuel FRM reactor design (SAFFIRE). A Catalyzed-D version of the plant is also discussed along with an investigation of the steady-state energy distribution of fps in the FRM. User guides for the two computer codes are also included.

Driemeyer, D.E.

1980-01-01T23:59:59.000Z

274

Measurement of multilayer mirror reflectivity and stimulated emission in the XUV spectral region  

SciTech Connect (OSTI)

We present measurements of multilayer mirror reflectivity and stimulated emission in the XUV spectral region. A molybdenum-silicon multilayer mirror with 12% measured reflectivity at 182 A was found to produce a 120% enhancement of the C VI 182 A line (3 ..-->.. 2 transition) in a strongly recombining plasma. No such enhancement of the CV 186.7 A line was seen, demonstrating amplification of stimulated emission at 182 A.

Keane, C.; Nam, C.H.; Meixler, L.; Milchberg, H.; Skinner, C.H.; Suckewer, S.; Voorhees, D.; Barbee, T.

1986-03-01T23:59:59.000Z

275

Relative radiant heat absorption characteristics of two types of mirror shields and a polished aluminum shield  

E-Print Network [OSTI]

RELATIVE RADIANT HEAT ABSORPTION CHARACTERISTICS OF TWO TYPES OF MIRROR SHIELDS AND A POLISHED ALUMINUM SHIELD A Thesis by STEVEN DOUGLAS HERRON Submitted to the Graduate College of Texas A&M University in partial fulfillment... of the requirement for the degree of MASTER OF SCIENCE August 1973 Major Subject: Industrial Hygiene RELATIVE RADIANT HEAT ABSORPTION CHARACTERISTICS OF TWO TYPES OF MIRROR SHIELDS AND A POLISHED ALUMINUM SHIELD A Thesis by STEVEN DOUGLAS HERRON Approved...

Herron, Steven Douglas

2012-06-07T23:59:59.000Z

276

LCLS X-ray mirror measurements using a large aperture visible light interferometer  

SciTech Connect (OSTI)

Synchrotron or FEL X-ray mirrors are required to deliver an X-ray beam from its source to an experiment location, without contributing significantly to wave front distortion. Accurate mirror figure measurements are required prior to installation to meet this intent. This paper describes how a 300 mm aperture phasing interferometer was calibrated to <1 nm absolute accuracy and used to mount and measure 450 mm long flats for the Linear Coherent Light Source (LCLS) at Stanford Linear Accelerator Center. Measuring focus mirrors with an interferometer requires additional calibration, because high fringe density introduces systematic errors from the interferometer's imaging optics. This paper describes how these errors can be measured and corrected. The calibration approaches described here apply equally well to interferometers larger than 300 mm aperture, which are becoming more common in optics laboratories. The objective of this effort was to install LCLS flats with < 10 nm of spherical curvature, and < 2 nm rms a-sphere. The objective was met by measuring the mirrors after fabrication, coating and mounting, using a 300 mm aperture phasing interferometer calibrated to an accuracy < 1 nm. The key to calibrating the interferometer accurately was to sample the error using independent geometries that are available. The results of those measurements helped identify and reduce calibration error sources. The approach used to measure flats applies equally well to focus mirrors, provided an additional calibration is performed to measure the error introduced by fringe density. This calibration has been performed on the 300 mm aperture interferometer, and the measurement correction was evaluated for a typical focus mirror. The 300 mm aperture limitation requires stitching figure measurements together for many X-ray mirrors of interest, introducing another possible error source. Stitching is eliminated by applying the calibrations described above to larger aperture instruments. The authors are presently extending this work to a 600 mm instrument. Instruments with 900 mm aperture are now becoming available, which would accommodate the largest mirrors of interest.

McCarville, T; Soufli, R; Pivovaroff, M

2011-03-02T23:59:59.000Z

277

Fast Neutron - Mirror Neutron Oscillation and Ultra High Energy Cosmic Rays  

E-Print Network [OSTI]

If there exists the mirror world, a parallel hidden sector of particles with exactly the same microphysics as that of the observable particles, then the primordial nucleosynthesis constraints require that the temperature of the cosmic background of mirror relic photons should be smaller than that of the ordinary relic photons, T'/T neutron - mirror neutron oscillation in vacuum, with an oscillation time $\\tau \\sim 1$ s, much smaller than the neutron lifetime. We show that this could provide a very efficient mechanism for transporting ultra high energy protons at large cosmological distances. The mechanism operates as follows: a super-GZK energy proton scatters a relic photon producing a neutron that oscillates into a mirror neutron which then decays into a mirror proton. The latter undergoes a symmetric process, scattering a mirror relic photon and producing back an ordinary nucleon, but only after traveling a distance $(T/T')^{3}$ times larger than ordinary protons. This may relax or completely remove the GZK-cutoff in the cosmic ray spectrum and also explain the correlation between the observed ultra high energy protons and far distant sources as are the BL Lacs.

Zurab Berezhiani; Luis Bento

2006-02-24T23:59:59.000Z

278

TEST RESULTS OF HTS COILS AND AN R&D MAGNET FOR RIA* , M. Anerella, M. Harrison, J. Schmalzle, W. Sampson, BNL, UPTON, NY, 11973 U.S.A.  

E-Print Network [OSTI]

TEST RESULTS OF HTS COILS AND AN R&D MAGNET FOR RIA* R. Gupta# , M. Anerella, M. Harrison, J This paper presents the successful construction and test results of a magnetic mirror model for the Rare Isotope Accelerator (RIA) that is based on High Temperature Superconductors (HTS). In addition

Gupta, Ramesh

279

Magnetic shielding  

DOE Patents [OSTI]

A magnetically-conductive filler material bridges the gap between a multi-part magnetic shield structure which substantially encloses a predetermined volume so as to minimize the ingress or egress of magnetic fields with respect to that volume. The filler material includes a heavy concentration of single-magnetic-domain-sized particles of a magnetically conductive material (e.g. soft iron, carbon steel or the like) dispersed throughout a carrier material which is generally a non-magnetic material that is at least sometimes in a plastic or liquid state. The maximum cross-sectional particle dimension is substantially less than the nominal dimension of the gap to be filled. An epoxy base material (i.e. without any hardening additive) low volatility vacuum greases or the like may be used for the carrier material. The structure is preferably exposed to the expected ambient magnetic field while the carrier is in a plastic or liquid state so as to facilitate alignment of the single-magnetic-domain-sized particles with the expected magnetic field lines. 3 figs.

Kerns, J.A.; Stone, R.R.; Fabyan, J.

1987-10-06T23:59:59.000Z

280

Magnetic shielding  

DOE Patents [OSTI]

A magnetically-conductive filler material bridges the gap between a multi-part magnetic shield structure which substantially encloses a predetermined volume so as to minimize the ingress or egress of magnetic fields with respect to that volume. The filler material includes a heavy concentration of single-magnetic-domain-sized particles of a magnetically conductive material (e.g. soft iron, carbon steel or the like) dispersed throughout a carrier material which is generally a non-magnetic material that is at least sometimes in a plastic or liquid state. The maximum cross-sectional particle dimension is substantially less than the nominal dimension of the gap to be filled. An epoxy base material (i.e. without any hardening additive) low volatility vacuum greases or the like may be used for the carrier material. The structure is preferably exposed to the expected ambient magnetic field while the carrier is in a plastic or liquid state so as to facilitate alignment of the single-magnetic-domain-sized particles with the expected magnetic field lines.

Kerns, John A. (Livermore, CA); Stone, Roger R. (Walnut Creek, CA); Fabyan, Joseph (Livermore, CA)

1987-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Strange Magnetism  

E-Print Network [OSTI]

We present an analytic and parameter-free expression for the momentum dependence of the strange magnetic form factor of the nucleon and its corresponding radius which has been derived in Heavy Baryon Chiral Perturbation Theory. We also discuss a model-independent relation between the isoscalar magnetic and the strange magnetic form factors of the nucleon based on chiral symmetry and SU(3) only. These limites are used to derive bounds on the strange magnetic moment of the proton from the recent measurement by the SAMPLE collaboration.

Thomas R. Hemmert; Ulf-G. Meissner; Sven Steininger

1998-11-09T23:59:59.000Z

282

Optical Magnetism  

Science Journals Connector (OSTI)

Magnetic dipole radiation one fourth as intense as electric dipole radiation, as well as a novel nonlinear magneto-optical effect are reported in dielectric media.

Oliveira, Samuel L; Rand, Stephen C

283

Vacuum compatible, high-speed, 2-D mirror tilt stage  

DOE Patents [OSTI]

A compact and vacuum compatible magnetic-coil driven tiltable stage that is equipped with a high efficiency reflective coating can be employed as a scanner in EUV applications. The drive electronics for the scanner is fully in situ programmable and rapidly switchable.

Denham; Paul E. (Crockett, CA)

2007-09-25T23:59:59.000Z

284

Magnetic Field Safety Magnetic Field Safety  

E-Print Network [OSTI]

Magnetic Field Safety Training #12;Magnetic Field Safety Strong Magnetic Fields exist around energized magnets. High magnetic fields alone are a recognized hazard only for personnel with certain medical conditions such as pacemakers, magnetic implants, or embedded shrapnel. In addition, high magnetic

McQuade, D. Tyler

285

Magnetic Field Safety Training  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Safety Training Magnetic Field Safety Strong Magnetic Fields exist around energized magnets. High magnetic fields alone are a recognized hazard only for personnel with certain...

286

Magnetic instabilities in collisionless astrophysical rotating plasma with anisotropic pressure  

SciTech Connect (OSTI)

A technique is developed for analytical study of instabilities in collisionless astrophysical rotating plasma with anisotropic pressure that may lead to magnetic turbulence. Description is based on a pair of equations for perturbations of the radial magnetic field and the sum of magnetic field and perpendicular plasma pressures. From these equations, a canonical second-order differential equation for the perturbed radial magnetic field is derived and, subsequently, the dispersion relation for local perturbations. The paper predicts two varieties of hybrid instabilities due to the effects of differential plasma rotation and pressure anisotropy: The rotational-firehose and rotational-mirror ones. When the gravitation force is weak compared with the perpendicular pressure gradient, a new family of instabilities (the pressure-gradient-driven) is revealed.

Mikhailovskii, A. B.; Pustovitov, V. D.; Erokhin, N. N. [Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, 1, Kurchatov Sq., Moscow 123182 (Russian Federation); Lominadze, J. G. [Kharadze Abastumani National Astrophysical Observatory, 2a, Kazbegi Ave., Tbilisi 0160 (Georgia); Nodia Institute of Geophysics, 1, Aleksidze Str., Tbilisi 0193 (Georgia); Smolyakov, A. I. [Institute of Nuclear Fusion, Russian Research Centre Kurchatov Institute, 1, Kurchatov Sq., Moscow 123182 (Russian Federation); University of Saskatchewan, 116 Science Place, Saskatoon S7N 5E2 (Canada); Churikov, A. P. [Syzran Branch of Samara Technical University, 45, Sovetskaya Str., Syzran, Samara Region 446001 (Russian Federation)

2008-06-15T23:59:59.000Z

287

Magnetic insulation  

Science Journals Connector (OSTI)

... by Winterberg1, led me to look into the background of the idea of 'magnetic insulation'. The purpose of this letter is to point out that the scheme described in ... were presented earlier in a longer article2. In that article he suggested that 'magnetic insulation' might make possible a transformer for 109 V. A year later the same objections ...

JOHN P. BLEWETT

1974-06-28T23:59:59.000Z

288

Magnetism1  

Science Journals Connector (OSTI)

... is reached, the rate of diminution becomes very rapid indeed, until, finally, the magnetism of the iron disappears at the same time as for small forces. Instead of ... a lower maximum, and its rise is less rapid. The critical temperature at which magnetism disappears changes rapidly with the composition of the steel. For very soft charcoal iron ...

1890-01-23T23:59:59.000Z

289

Magnetism Group  

Science Journals Connector (OSTI)

... of the Institute of Physics and the Physical Society has announced the establishment of a Magnetism Group. The aim of the new Group is to further interest in ... Group. The aim of the new Group is to further interest in magnetism by holding regular discussion meetings and in other ways. It is intended that these ...

1965-09-04T23:59:59.000Z

290

Terrestrial Magnetism*  

Science Journals Connector (OSTI)

... A similar investigation of the effect of the moon's action on terrestrial magnetism requires a series of observations made at much less distant intervals than the monthly ones ... heat, from the central body of our system, or merely having its own inherent magnetism modified by solar action, then we must choose as our unit the lunation, or ...

1873-01-09T23:59:59.000Z

291

Terrestrial Magnetism*  

Science Journals Connector (OSTI)

... IN bringing before you this evening, gentlemen, the subject of terrestrial magnetism, it is not my intention to attempt to present you with an exhaustive paper ... clearly as I am able, what is the actual condition of our knowledge respecting the magnetism of the globe, and what the nature of its complex variations, without, however, ...

1873-01-02T23:59:59.000Z

292

Terrestrial Magnetism  

Science Journals Connector (OSTI)

... THE present activity of the department of terrestrial magnetism of the Carnegie Institution of Washington and the largeness of its future aims are alike ... a progress report which he contributes to the latest (March) number of Terrestrial Magnetism. The department, which has lately entered on its eleventh year, has under construetion ...

C. CHREE

1914-07-23T23:59:59.000Z

293

Remanent Magnetism  

Science Journals Connector (OSTI)

... STUDY of the natural remanent magnetism of rocks is becoming a familiar method for determining the direction of the Earth's ... the geomagnetic poles or of the continents themselves. An alternative use for measurements of remanent magnetism, namely, the determination of the temperature of formation of pyroclastic deposits, is described ...

1958-03-22T23:59:59.000Z

294

Magnetic shielding  

DOE Patents [OSTI]

A magnetically-conductive filler material bridges the gap between a multi-part magnetic shield structure which substantially encloses a predetermined volume so as to minimize the ingress or egress of magnetic fields with respect to that volume. The filler material includes a heavy concentration of single-magnetic-domain-sized particles of a magnetically conductive material (e.g. soft iron, carbon steel or the like) dispersed throughout a carrier material which is generally a non-magnetic material that is at least sometimes in a plastic or liquid state. The maximum cross-sectional particle dimension is substantially less than the nominal dimension of the gap to be filled. An epoxy base material (i.e. without any hardening additive) low volatility vacuum greases or the like may be used for the carrier material. The structure is preferably exposed to the expected ambient field while the carrier is in a plastic or liquid state so as to facilitate alignment of the single-magnetic-domain-sized particles with the expected magnetic field lines.

Kerns, J.A.; Stone, R.R.; Fabyan, J.

1985-02-12T23:59:59.000Z

295

Design of a Thermal Imaging Diagnostic Using 90-Degree, Off-Axis, Parabolic Mirrors  

SciTech Connect (OSTI)

Thermal imaging is an important, though challenging, diagnostic for shockwave experiments. Shock-compressed materials undergo transient temperature changes that cannot be recorded with standard (greater than ms response time) infrared detectors. A further complication arises when optical elements near the experiment are destroyed. We have designed a thermal-imaging system for studying shock temperatures produced inside a gas gun at Sandia National Laboratories. Inexpensive, diamond-turned, parabolic mirrors relay an image of the shocked target to the exterior of the gas gun chamber through a sapphire vacuum port. The 30005000-nm portion of this image is directed to an infrared camera which acquires a snapshot of the target with a minimum exposure time of 150 ns. A special mask is inserted at the last intermediate image plane, to provide dynamic thermal background recording during the event. Other wavelength bands of this image are split into high-speed detectors operating at 9001700 nm, and at 17003000 nm for timeresolved pyrometry measurements. This system incorporates 90-degree, off-axis parabolic mirrors, which can collect low f/# light over a broad spectral range, for high-speed imaging. Matched mirror pairs must be used so that aberrations cancel. To eliminate image plane tilt, proper tip-to-tip orientation of the parabolic mirrors is required. If one parabolic mirror is rotated 180 degrees about the optical axis connecting the pair of parabolic mirrors, the resulting image is tilted by 60 degrees. Different focal-length mirrors cannot be used to magnify the image without substantially sacrificing image quality. This paper analyzes performance and aberrations of this imaging diagnostic.

Malone, Robert M.; Becker, Steven A.; Dolan, Daniel H.; Hacking, Richard G.; Hickman, Randy J.; Kaufman, Morris I.; Stevens, Gerald D.; Turley, William D.

2006-09-01T23:59:59.000Z

296

Superconducting Magnets  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Mit Hilfe der Technologie supraleitender Magnete lassen sich in Mit Hilfe der Technologie supraleitender Magnete lassen sich in Ringbeschleunigern höhere Energien erreichen. Weil supraleitende Spulen keinen elektrischen Widerstand aufweisen, können damit stärkere Magnetfelder erzeugt werden. In normal leitenden Elektromagneten wird - wegen des elektrischen Widerstands der Drähte - die Spule aufgeheizt. Auf diese Weise geht sehr viel Energie in Form von Wärme verloren, was die Energiekosten dieser Magnete in die Höhe treibt. Supraleitende Spulen erlauben es, Magnete grosser Feldstärke unter günstigen Bedingungen zu betreiben und damit die Energiekosten zu senken. Durch den Einbau supraleitender Spulen in den Ringbeschleuniger von Fermilab konnte dessen Energie verdoppelt werden.Auch der im Bau befindliche "Large Hadron Collider" am CERN wird supraleitende Magnete

297

Magnetic nanotubes  

DOE Patents [OSTI]

A magnetic nanotube includes bacterial magnetic nanocrystals contacted onto a nanotube which absorbs the nanocrystals. The nanocrystals are contacted on at least one surface of the nanotube. A method of fabricating a magnetic nanotube includes synthesizing the bacterial magnetic nanocrystals, which have an outer layer of proteins. A nanotube provided is capable of absorbing the nanocrystals and contacting the nanotube with the nanocrystals. The nanotube is preferably a peptide bolaamphiphile. A nanotube solution and a nanocrystal solution including a buffer and a concentration of nanocrystals are mixed. The concentration of nanocrystals is optimized, resulting in a nanocrystal to nanotube ratio for which bacterial magnetic nanocrystals are immobilized on at least one surface of the nanotubes. The ratio controls whether the nanocrystals bind only to the interior or to the exterior surfaces of the nanotubes. Uses include cell manipulation and separation, biological assay, enzyme recovery, and biosensors.

Matsui, Hiroshi (Glen Rock, NJ); Matsunaga, Tadashi (Tokyo, JP)

2010-11-16T23:59:59.000Z

298

Characterization Of High-Stroke High-Aspect Ratio Micro Electro Mechanical Systems Deformable Mirrors For Adaptive Optics  

E-Print Network [OSTI]

Mirrors For Adaptive Optics, PhD Thesis, University ofFabrication Adaptive optics applications in astronomy Max, Center for Adaptive Optics, University of California,

Bouchti, Mohamed Amine

2013-01-01T23:59:59.000Z

299

Microscopic surface structure of C/SiC composite mirrors for space cryogenic telescopes  

E-Print Network [OSTI]

We report on the microscopic surface structure of carbon-fiber-reinforced silicon carbide (C/SiC) composite mirrors that have been improved for the Space Infrared Telescope for Cosmology and Astrophysics (SPICA) and other cooled telescopes. The C/SiC composite consists of carbon fiber, silicon carbide, and residual silicon. Specific microscopic structures are found on the surface of the bare C/SiC mirrors after polishing. These structures are considered to be caused by the different hardness of those materials. The roughness obtained for the bare mirrors is 20 nm rms for flat surfaces and 100 nm rms for curved surfaces. It was confirmed that a SiSiC slurry coating is effective in reducing the roughness to 2 nm rms. The scattering properties of the mirrors were measured at room temperature and also at 95 K. No significant change was found in the scattering properties through cooling, which suggests that the microscopic surface structure is stable with changes in temperature down to cryogenic values. The C/SiC mirror with the SiSiC slurry coating is a promising candidate for the SPICA telescope.

Keigo Enya; Takao Nakagawa; Hidehiro Kaneda; Takashi Onaka; Tuyoshi Ozaki; Masami Kume

2007-07-10T23:59:59.000Z

300

The dual-mirror Small Size Telescope for the Cherenkov Telescope Array  

E-Print Network [OSTI]

In this paper, the development of the dual mirror Small Size Telescopes (SST) for the Cherenkov Telescope Array (CTA) is reviewed. Up to 70 SST, with a primary mirror diameter of 4 m, will be produced and installed at the CTA southern site. These will allow investigation of the gamma-ray sky at the highest energies accessible to CTA, in the range from about 1 TeV to 300 TeV. The telescope presented in this contribution is characterized by two major innovations: the use of a dual mirror Schwarzschild-Couder configuration and of an innovative camera using as sensors either multi-anode photomultipliers (MAPM) or silicon photomultipliers (SiPM). The reduced plate-scale of the telescope, achieved with the dual-mirror optics, allows the camera to be compact (40 cm in diameter), and low-cost. The camera, which has about 2000 pixels of size 6x6 mm^2, covers a field of view of 10{\\deg}. The dual mirror telescopes and their cameras are being developed by three consortia, ASTRI (Astrofisica con Specchi a Tecnologia Repl...

Pareschi, G; Antonelli, L A; Bastieri, D; Bellassai, G; Belluso, M; Bigongiari, C; Billotta, S; Biondo, B; Bonanno, G; Bonnoli, G; Bruno, P; Bulgarelli, A; Canestrari, R; Capalbi, M; Caraveo, P; Carosi, A; Cascone, E; Catalano, O; Cereda, M; Conconi, P; Conforti, V; Cusumano, G; De Caprio, V; De Luca, A; Di Paola, A; Di Pierro, F; Fantinel, D; Fiorini, M; Fugazza, D; Gardiol, D; Ghigo, M; Gianotti, F; Giarrusso, S; Giro, E; Grillo, A; Impiombato, D; Incorvaia, S; La Barbera, A; La Palombara, N; La Parola, V; La Rosa, G; Lessio, L; Leto, G; Lombardi, S; Lucarelli, F; Maccarone, M C; Malaguti, G; Malaspina, G; Mangano, V; Marano, D; Martinetti, E; Millul, R; Mineo, T; Mist, A; Morello, C; Morlino, G; Panzera, M R; Rodeghiero, G; Romano, P; Russo, F; Sacco, B; Sartore, N; Schwarz, J; Segreto, A; Sironi, G; Sottile, G; Stamerra, A; Strazzeri, E; Stringhetti, L; Tagliaferri, G; Testa, V; Timpanaro, M C; Toso, G; Tosti, G; Trifoglio, M; Vallania, P; Vercellone, S; Zitelli, V; Amans, J P; Boisson, C; Costille, C; Dournaux, J L; Dumas, D; Fasola, G; Hervet, O; Huet, J M; Laporte, P; Rulten, C; Sol, H; Zech, A; White, R; Hinton, J; Ross, D; Sykes, J; Ohm, S; Schmoll, J; Chadwick, P; Greenshaw, T; Daniel, M; Cotter, G; Varner, G S; Funk, S; Vandenbroucke, J; Sapozhnikov, L; Buckley, J; Moore, P; Williams, D; Markoff, S; Vink, J; Berge, D; Hidaka, N; Okumura, A; Tajima, H

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Linear chain magnetism  

Science Journals Connector (OSTI)

Linear chain magnetism ... A brief introduction to this concept, which is also called lower dimensional magnetism. ...

Richard L. Carlin

1991-01-01T23:59:59.000Z

302

Low dimensional magnetism  

E-Print Network [OSTI]

Magnetism in Ultracold Gases 4 Magnetic phase diagram of aMagnetism . . . . . . . . . . . .1.3 Magnetism in condensedIntroduction 1 Brief introduction to magnetism 1.1 Classic

Kjall, Jonas Alexander

2012-01-01T23:59:59.000Z

303

Magnetic Viscosity  

Science Journals Connector (OSTI)

1 January 1893 research-article Magnetic Viscosity J. Hopkinson E. Wilson F. Lydall The Royal Society is collaborating with JSTOR to digitize, preserve, and extend access to Proceedings of the Royal Society of London. www.jstor.org

1893-01-01T23:59:59.000Z

304

Rock magnetism  

Science Journals Connector (OSTI)

The past three decades have witnessed a new paradigm, the plate tectonics paradigm, in Earth sciences. The record of the Earth's magnetic field stored in rocks played a major role in the establishment of this par...

Ronald T. Merrill

1989-01-01T23:59:59.000Z

305

Safety and power multiplication aspects of mirror fusion-fission hybrids  

SciTech Connect (OSTI)

Recently, in a research project at Uppsala University a simplified neutronic model for a straight field line mirror hybrid has been devised and its most important operation parameters have been calculated under the constraints of a fission power production of 3 GW and that the effective multiplication factor k{sub eff} does not exceed 0.95. The model can be considered as representative for hybrids driven by other types of mirrors too. In order to reduce the demand on the fusion power of the mirror, a modified option of the hybrid has been considered that generates a reduced fission power of 1.5 GW with an increased maximal value k{sub eff}=0.97. The present paper deals with nuclear safety aspects of this type of hybrids. It presents and discusses calculation results of reactivity effects as well as of driver effects.

Noack, Klaus; Agren, Olov; Kaellne, Jan; Hagnestal, Anders; Moiseenko, Vladimir E. [Uppsala University, Angstroem Laboratory, Division of Electricity, Box 534, SE-751 21 Uppsala (Sweden); Institute of Plasma Physics, National Science Center 'Kharkiv Institute of Physics and Technology', Akademichna St. 1, 61108 Kharkiv (Ukraine)

2012-06-19T23:59:59.000Z

306

Scalable stacked array piezoelectric deformable mirror for astronomy and laser processing applications  

SciTech Connect (OSTI)

A prototype of a scalable and potentially low-cost stacked array piezoelectric deformable mirror (SA-PDM) with 35 active elements is presented in this paper. This prototype is characterized by a 2 ?m maximum actuator stroke, a 1.4 ?m mirror sag (measured for a 14 mm 14 mm area of the unpowered SA-PDM), and a 200 nm hysteresis error. The initial proof of concept experiments described here show that this mirror can be successfully used for shaping a high power laser beam in order to improve laser machining performance. Various beam shapes have been obtained with the SA-PDM and examples of laser machining with the shaped beams are presented.

Wlodarczyk, Krystian L., E-mail: K.L.Wlodarczyk@hw.ac.uk; Maier, Robert R. J.; Hand, Duncan P. [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)] [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); Bryce, Emma; Hutson, David; Kirk, Katherine [School of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE (United Kingdom)] [School of Engineering and Science, University of the West of Scotland, Paisley PA1 2BE (United Kingdom); Schwartz, Noah; Atkinson, David; Beard, Steven; Baillie, Tom; Parr-Burman, Phil [UK Astronomy Technology Centre, Royal Observatory, Edinburgh EH9 3HJ (United Kingdom)] [UK Astronomy Technology Centre, Royal Observatory, Edinburgh EH9 3HJ (United Kingdom); Strachan, Mel [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom) [Institute of Photonics and Quantum Sciences, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom); UK Astronomy Technology Centre, Royal Observatory, Edinburgh EH9 3HJ (United Kingdom)

2014-02-15T23:59:59.000Z

307

Phase effects owing to multilayer coatings in a two-mirror extreme-ultraviolet Schwarzschild objective  

SciTech Connect (OSTI)

The aberrations of a multilayer-coated reflective Schwarzchild objective, which are influenced both by mirror surface profiles and by multilayer coatings, are evaluated with a phase-shifting point diffraction interferometer operating in the extreme ultraviolet. Using wave-front measurements at multiple wavelengths near 13.4 nm, we observed chromatic aberrations and wavelength-dependent transmission changes that were due to molybdenum{endash}silicon multilayer coatings. The effects of chromatic vignetting due to limited multilayer reflection passbands on the imaging performance of the Schwarzchild optic are considered. The coating characteristics extracted from the interferometry data on the two-mirror optical system are compared with previously reported coating properties measured on individual mirror substrates. {copyright} 1998 Optical Society of America

Tejnil, E.; Goldberg, K.A.; Bokor, J. [Center for X-Ray Optics, Lawrence Berkeley National Laboratory, Berkeley, California 94720 (United States)

1998-12-01T23:59:59.000Z

308

Multi-range free-electron laser with a pair of dielectric multilayer mirrors  

SciTech Connect (OSTI)

We report the experimental achievement of a free-electron laser in three wavelength regions, mid-infrared, near-infrared, and visible, using a pair of dielectric multilayer mirrors in the storage ring NIJI-IV. Dielectric multilayer mirrors can have high reflectivity at wavelength regions corresponding to higher-diffraction orders of the target wavelength. A narrowing of the relative bandwidth of the dielectric multilayer mirrors was observed in the higher-diffraction orders of the target wavelength and was found to be caused by high diffraction and carbon contamination. Our experimental results will be applied to development of a multi-rang laser that have a gain in a wade wavelength region.

Sei, Norihiro; Ogawa, Hiroshi; Yamada, Kawakatsu [Research Institute of Instrumentation Frontier, National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568 (Japan)

2012-10-01T23:59:59.000Z

309

Learning About Magnets!  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

the the National High Magnetic Field Laboratory Learning About Name A magnet is a material or object that creates a magnetic fi eld. This fi eld is invisible, but it creates a force that can "attract" or "repel" other magnets and magnetic materials, like iron or nickel. What is a Magnet? This bar magnet is a permanent magnet. Permanent magnets can be found in the Earth as rocks and metals. Magnets have

310

Plasma-wall interaction in Hall thrusters with magnetic lens configuration  

SciTech Connect (OSTI)

Some recently developed Hall thrusters utilize a magnetic field configuration in which the field lines penetrate the thruster walls at a high incidence angle. This so-called magnetic lens leads to an electric field pointing away from the walls, which is expected to reduce ion losses and improve thruster efficiency. This configuration also introduces an interesting behavior in the sheath formation. At sufficiently large angles, ions are repelled from the wall, and sheath collapse is expected. We use a plasma simulation code to investigate this phenomenon in detail. We consider the role of the magnetic field incidence angle, secondary electron emission, and a magnetic mirror. Numerical study confirms the theoretical predictions, and at large angles, ions are seen to turn away from the wall. We also consider the role of the magnetic field geometry on ion wall flux and channel erosion, and observe reduction in both quantities as the magnetic field incidence angle is increased.

Brieda, Lubos; Keidar, Michael [Department of Mechanical and Aerospace Engineering, George Washington University, 801 22nd St., Washington, DC 20052 (United States)

2012-06-15T23:59:59.000Z

311

Controlling Magnetism at the Nanoscale  

E-Print Network [OSTI]

Manipulation of Magnetism - External148 Conclusion A The Magnetism Cheat Sheet A.1 Magnetic157 A.2 Magnetism Unit Conversion

Wong, Jared

2012-01-01T23:59:59.000Z

312

Simbol-X Mirror Module Thermal Shields: II-Small Angle X-Ray Scattering Measurements  

SciTech Connect (OSTI)

The formation flight configuration of the Simbol-X mission implies that the X-ray mirror module will be open to Space on both ends. In order to reduce the power required to maintain the thermal stability and, therefore, the high angular resolution of the shell optics, a thin foil thermal shield will cover the mirror module. Different options are presently being studied for the foil material of these shields. We report results of an experimental investigation conducted to verify that the scattering of X-rays, by interaction with the thin foil material of the thermal shield, will not significantly affect the performances of the telescope.

Barbera, M. [Universita degli Studi di Palermo, Dip. di Scienze Fisiche ed Astronomiche, Palermo (Italy); Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Palermo G.S. Vaiana, Palermo (Italy); Ayers, T. [Luxel Corporation, Friday Harbor (WA) (United States); Collura, A. [Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Palermo G.S. Vaiana, Palermo (Italy); Nasillo, G. [Universita degli Studi di Palermo, Centro Grandi Apparecchiature, Palermo (Italy); Pareschi, G.; Tagliaferri, G. [Istituto Nazionale di Astrofisica-Osservatorio Astronomico di Brera, Merate (Italy)

2009-05-11T23:59:59.000Z

313

Demonstration of achromatic cold-neutron microscope utilizing axisymmetric focusing mirrors  

SciTech Connect (OSTI)

An achromatic cold-neutron microscope with magnification 4 is demonstrated. The image-forming optics is composed of nested coaxial mirrors of full figures of revolution, so-called Wolter optics. The spatial resolution, field of view, and depth of focus are measured and found consistent with ray-tracing simulations. Methods of increasing the resolution and magnification are discussed, as well as the scientific case for the neutron microscope. In contrast to traditional pinhole-camera neutron imaging, the resolution of the microscope is determined by the mirrors rather than by the collimation of the beam, leading to possible dramatic improvements in the signal rate and resolution.

Liu, D.; Khaykovich, B. [Nuclear Reactor Laboratory, Massachusetts Institute of Technology, 138 Albany St., Cambridge, Massachusetts 02139 (United States)] [Nuclear Reactor Laboratory, Massachusetts Institute of Technology, 138 Albany St., Cambridge, Massachusetts 02139 (United States); Hussey, D.; Jacobson, D.; Arif, M. [Physical Measurement Laboratory, NIST, Gaithersburg, Maryland 20899-8461 (United States)] [Physical Measurement Laboratory, NIST, Gaithersburg, Maryland 20899-8461 (United States); Gubarev, M. V.; Ramsey, B. D. [Marshall Space Flight Center, NASA, VP62, Huntsville, Alabama 35812 (United States)] [Marshall Space Flight Center, NASA, VP62, Huntsville, Alabama 35812 (United States); Moncton, D. E. [Nuclear Reactor Laboratory, Massachusetts Institute of Technology, 138 Albany St., Cambridge, Massachusetts 02139 (United States) [Nuclear Reactor Laboratory, Massachusetts Institute of Technology, 138 Albany St., Cambridge, Massachusetts 02139 (United States); Department of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139 (United States)

2013-05-06T23:59:59.000Z

314

Demonstration of a plasma mirror based on a laminar flow water film  

SciTech Connect (OSTI)

A plasma mirror based on a laminar water film with low flow speed 0.5-2 cm/s has been developed and characterized, for use as an ultrahigh intensity optical reflector. The use of flowing water as atarget surface automatically results in each laser pulse seeing a new interaction surface and avoids the need for mechanical scanning of the target surface. In addition, the breakdown of water does notproduce contaminating debris that can be deleterious to vacuum chamber conditions and optics, such as is the case when using conventional solid targets. The mirror exhibits 70percent reflectivity, whilemaintaining high-quality of the reflected spot.

Panasenko, Dmitriy; Shu, Anthony; Gonsalves, Anthony; Nakamura, Kei; Matlis, Nicholas; Toth, Csaba; Leemans, Wim

2011-07-22T23:59:59.000Z

315

Collective F\\"orster energy transfer modified by the planar metallic mirror  

E-Print Network [OSTI]

We present a theory of the F\\"orster energy transfer between the arrays of donor and acceptor molecules lying on the planar metallic mirror. We reveal strong modification of the effective transfer rate by the mirror in the incoherent pumping regime. The rate can be either suppressed or enhanced depending on the relative positions between acceptor and donor arrays. The strong modification of the transfer rate is a collective effect, mediated by the light-induced coupling between the donors; it is absent in the single donor model.

Poddubny, Alexander N

2015-01-01T23:59:59.000Z

316

Plasma engineering models of tandem mirror devices with high-field test-cell inserts  

SciTech Connect (OSTI)

Plasma physics and engineering models of tandem mirror devices operated with a high-field technology test-cell insert in the central cell, which have been incorporated recently in the TMRBAR tandem mirror reactor physics code, are described. The models include particle and energy balance in the test-cell region as well as the interactions between the test-cell particles and those flowing through the entire device. The code calculations yield consistent operating parameters for the test-cell, central cell, and end cell systems. A benchmark case for the MFTF-..cap alpha..+T configuration is presented which shows good agreement between the code results and previous calculations.

Fenstermacher, M.E.; Campbell, R.B.

1985-04-03T23:59:59.000Z

317

Physics modeling of tandem mirror devices with high-field test cell inserts  

SciTech Connect (OSTI)

Recently developed plasma physics models of tandem mirror operation with a high-field technology test cell insert in the central cell are described in detail. These models have been incorporated in the TMRBAR tandem mirror reactor physics code. Results of a benchmark case for the code models against previous analysis of the MFTF - ..cap alpha.. /sup +/ T configuration are given. A brief users guide to the new TMRBAR with the test cell models is also presented. Some description of the applications of the models to MFTF - ..cap alpha.. /sup +/ T and FPD - II + T configurations is made. References are given to separate reports on these studies.

Fenstermacher, M.E.; Campbell, R.B.

1985-04-15T23:59:59.000Z

318

Neutrino magnetic moment in a magnetized plasma  

E-Print Network [OSTI]

The contribution of a magnetized plasma to the neutrino magnetic moment is calculated. It is shown that only part of the additional neutrino energy in magnetized plasma connecting with its spin and magnetic field strength defines the neutrino magnetic moment. It is found that the presence of magnetized plasma does not lead to the considerable increase of the neutrino magnetic moment in contrast to the results presented in literature previously.

N. V. Mikheev; E. N. Narynskaya

2010-11-08T23:59:59.000Z

319

Ultracold neutron depolarization in magnetic bottles  

Science Journals Connector (OSTI)

We analyze the depolarization of ultracold neutrons confined in a magnetic field configuration similar to those used in existing or proposed magnetogravitational storage experiments aiming at a precise measurement of the neutron lifetime. We use an extension of the semiclassical Majorana approach as well as an approximate quantum mechanical analysis, both pioneered by Walstrom et al. [Nucl. Instrum. Methods Phys. Res. A 599, 82 (2009)]. In contrast with this previous work we do not restrict the analysis to purely vertical modes of neutron motion. The lateral motion is shown to cause the predominant depolarization loss in a magnetic storage trap. The system studied also allowed us to estimate the depolarization loss suffered by ultracold neutrons totally reflected on a nonmagnetic mirror immersed in a magnetic field. This problem is of preeminent importance in polarized neutron decay studies such as the measurement of the asymmetry parameter A using ultracold neutrons, and it may limit the efficiency of ultracold neutron polarizers based on passage through a high magnetic field.

A. Steyerl; C. Kaufman; G. Mller; S. S. Malik; A. M. Desai

2012-12-07T23:59:59.000Z

320

Heat Pumps | Department of Energy  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

heat pump can deliver one-and-a-half to three times more heat energy to a home than the electrical energy it consumes. | Photo courtesy of iStockPhotoYinYang. If you live in a...

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Optical and Durability Evaluation for Silvered Polymeric Mirrors and Reflectors: Cooperative Research and Development Final Report, CRADA Number, CRD-08-316  

SciTech Connect (OSTI)

3M is currently developing silvered polymeric mirror reflectors as low-cost replacements for glass mirrors in concentrating solar power (CSP) systems. This effort is focused on development of reflectors comprising both metallized polymeric mirror films based on improved versions of ECP-305+ or other durable mirror film concepts and appropriate mechanically robust substrates. The objectives for this project are to reduce the system capital and operating costs and to lower the levelized cost of energy for CSP installations. The development of mirror reflectors involves work on both full reflectors and mirror films with and without coatings. Mirror reflectors must meet rigid optical specifications in terms of radius of curvature, slope errors and specularity. Mirror films must demonstrate long-term durability and maintain high reflectivity. 3M would like to augment internal capabilities to validate product performance with methods and tools developed at NREL to address these areas.

Gray, M.

2014-08-01T23:59:59.000Z

322

Design and fabrication of a 1.2 meter long internally cooled silicon x-ray mirror for APS  

SciTech Connect (OSTI)

This paper describes the specifications, design, and fabrication of a 1.2 meter long ultra high vacuum (UHV) silicon mirror for use as the first optical element on an x-ray beamline at APS. The mirror, which is 1,200 mm x 90 mm x 120 mm in size, intercepts the incident x-ray beam at 0.15{degree}. The thermal power incident on the mirror is 1.2 kW with a peak heat flux of 0.38 W/mm{sup 2}. The heat is removed by flowing water through a set of channels configured in the face plate of the mirror. Various aspects of this mirror, including its purpose, utility, expected thermal and structural performance, cooling design, UHV provision, support and mounting, surface figure and finish, bonding of the cooling conduits, and other manufacturing steps are discussed.

Tonnessen, T.W. [Rocketdyne Albuquerque Operations, NM (United States); Khounsary, A.M.; Yun, W.B.; Shu, D. [Argonne National Lab., IL (United States). Advanced Photon Source

1996-12-31T23:59:59.000Z

323

Petroglyphs, Lighting, and Magnetism  

E-Print Network [OSTI]

1950 Electricity and Magnetism: Theory and Applications.I Petroglyphs, Lightning, and Magnetism | Walker Figure 8.I Petroglyphs, Lightning, and Magnetism | Walker Figure IL

Walker, Merle F

2007-01-01T23:59:59.000Z

324

A comparison of different alignment approaches for the segmented grazing incidence mirrors on Constellation-X  

E-Print Network [OSTI]

on Constellation-X Paul B. Reida , David Caldwella , William Davisa , Mark Freemana , Scott Owens Rohrbachb Spectroscopy X-ray Telescopes (SXT) on Constellation-X contain a mirror assembly comprised of 2600 primary, Constellation-X, Con-X 1. INTRODUCTION Constellation-X (Con-X) is the next large x-ray observatory-class mission

Christian, Eric

325

Simbol-X Mirror Module Thermal Shields: I - Design and X-Ray Transmission  

SciTech Connect (OSTI)

The Simbol-X mission is designed to fly in formation flight configuration. As a consequence, the telescope has both ends open to space, and thermal shielding at telescope entrance and exit is required to maintain temperature uniformity throughout the mirrors. Both mesh and meshless solutions are presently under study for the shields. We discuss the design and the X-ray transmission.

Collura, A.; Varisco, S. [INAF-OAPA Via G.F. Ingrassia, 31 90123 Palermo (Italy); Barbera, M. [INAF-OAPA Via G.F. Ingrassia, 31 90123 Palermo (Italy); DSFA Universita di Palermo, Via Archirafi 36, 90123 Palermo (Italy); Basso, S.; Pareschi, G.; Tagliaferri, G. [INAF-OAB, via E. bianchi 46, 23807 Merate (Italy); Ayers, T. [Luxel Corporation, Friday Harbor, WA 98250 (United States)

2009-05-11T23:59:59.000Z

326

Dyadic brain modelling, mirror systems and the ontogenetic ritualization of ape gesture  

Science Journals Connector (OSTI)

...Francesco Ferrari and Giacomo Rizzolatti Dyadic brain modelling, mirror systems and the ontogenetic...Los Angeles, CA 90089-2520, USA 2 USC Brain Project, University of Southern California...implications . The paper introduces dyadic brain modelling, offering both a framework for...

2014-01-01T23:59:59.000Z

327

Integrated Modeling and Design of Lightweight, Active Mirrors for Launch Survival and On-Orbit  

E-Print Network [OSTI]

Integrated Modeling and Design of Lightweight, Active Mirrors for Launch Survival and On-Orbit Performance Lucy E. Cohan and David W. Miller June 2010 SSL# 2-10 #12;#12;Integrated Modeling and Design-based design and evolutionary models to guide the technology development program. This methodology is applied

328

Analytical models of transient thermoelastic deformations of mirrors heated by high power cw laser beams  

E-Print Network [OSTI]

and are suspended in a vacuum vessel : the heat losses are only due to the thermal radiation. The resulting2243 Analytical models of transient thermoelastic deformations of mirrors heated by high power cw substrat. La distribution de température engendrée dans le substrat produit des déformations

Boyer, Edmond

329

Development of a 4096 Element MEMS Continuous Membrane Deformable Mirror for High Contrast  

E-Print Network [OSTI]

Water St, Watertown, MA 02472, (617)926-3948, SAC@bostonmicromachines.com, (617)926-8796, PAB. This deformable mirror will enable the next generation of adaptive optics ("Extreme" AO) capable of achieving parent star, atmospheric aberrations, and optical imperfections in the imaging systems1 . MEMS DMs

330

DOI: 10.1002/adma.200601354 Micropatterned Porous-Silicon Bragg Mirrors by Dry-Removal  

E-Print Network [OSTI]

DOI: 10.1002/adma.200601354 Micropatterned Porous-Silicon Bragg Mirrors by Dry-Removal Soft is reversible, the films can be cycled through multiple detec- tion runs without additional preparation steps- vious efforts in our group have demonstrated the effectiveness of PSi pattern formation by dry-removal

Buratto, Steve

331

Optical analysis of an ultra-high resolution two-mirror soft x-ray microscope  

Science Journals Connector (OSTI)

Promoted by the successful application of multilayer coated optics in soft x-ray imaging experiments in solar physics and projection lithography, several groups have designed, analyzed, fabricated, and are testing Schwarzschild multilayer soft x-ray microscopes. Simulations have indicated that diffraction limited performance of a spherical Schwarzschild microscope operating near 100 will be limited to systems with a small numerical aperture of approximately 0.15 and a corresponding resolution, based on the Rayleigh criterion, of 3.3 times the wavelength of the incident radiation. In principle, a two aspherical mirror Head microscope, which satisfies the constant optical path length condition and the Abb sine condition, should achieve diffraction limited performance for very large numerical apertures. For a practical soft x-ray microscope, surface contour errors, microroughness, reflectance of multilayer coatings, and variation of the angle of incidence over the multilayer substrates become significant factors in degrading system resolution and must be controlled before an ultra-high resolution, two-mirror microscope will be realized. For a 30x reflecting microscope with a numerical aperture ranging from 0.15 to 0.35, the effects on resolution of surface contour errors, tilts, and misalignments of the optics have been studied. Graded spacing of the multilayer coatings on the mirror substrates are required of a fast, two-mirror microscope.

David L. Shealy; Cheng Wang; Richard B. Hoover

1995-01-01T23:59:59.000Z

332

Cryogenic Yb:YAG Total-Reflection Active-Mirror Lasers  

Science Journals Connector (OSTI)

A regenerative amplifier with a cryogenic Yb:YAG total-reflection active-mirror shows 3.5mJ at 100Hz with M2<1.1. A high energy fluence of 2.6J/cm2 energy fluence is achieved for...

Kawanaka, Junji; Furuse, Hiroaki; Albach, Daniel; Takeuchi, Yasuki; Yoshida, Akira; Kawashima, Toshiyuki; Kan, Hirofumi

333

2000 Special Issue Synthetic brain imaging: grasping, mirror neurons and imitation  

E-Print Network [OSTI]

2000 Special Issue Synthetic brain imaging: grasping, mirror neurons and imitation M.A. Arbiba,b,*, A. Billardb , M. Iacobonic , E. Oztopa,b a USC Brain Project, University of Southern California, Los, CA 90089-2520, USA c Division of Brain Mapping, Neuropsychiatric Institute, UCLA School of Medicine

Oztop, Erhan

334

Active Optics Performance Study of the Primary Mirror of the Gemini Telescopes Project  

E-Print Network [OSTI]

Active Optics Performance Study of the Primary Mirror of the Gemini Telescopes Project Myung K. Cho Optical Sciences Center in the University of Arizona Tucson, AZ 85721 and Gemini Telescopes Project P. O. Box 26732 Tucson, AZ 85726­6732 Gemini Preprint #9 #12; Active optics performance study of the primary

335

4096-element continuous face-sheet MEMS deformable mirror for high-contrast imaging  

E-Print Network [OSTI]

structural support on electrical interconnections. Eight high-density flex cables connect the DM to the drive systems MEMS deformable mirror, fabricated using polysilicon surface micromachining manufacturing that is electrically isolated from the electrodes and maintained at a ground potential. The actuators are arranged

336

Status of the Tandem Mirror Experiment-Upgrade (TMX-U) diagnostic system  

SciTech Connect (OSTI)

This paper presents the current status of the Tandem Mirror Experiment-Upgrade (TMX-U) diagnostics system. For the initial instruments active on TMX-U, the expansions or upgrades that have been implemented are outlined. For the newly added systems, more implementation details are presented.

Coutts, G.W.; Coffield, F.E.; Hornady, R.S.

1983-11-26T23:59:59.000Z

337

Evidence for Collisionless Damping of Unstable Waves in a Mirror-Confined Plasma  

Science Journals Connector (OSTI)

Measurements of density thresholds for an ion-cyclotron instability in a mirror-confined plasma are interpreted in terms of a boundary for Landau damping of the unstable waves. Allowing for an observed normal-mode structure, experimental threshold values are accounted for quantitatively.

C. C. Damm, J. H. Foote, A. H. Futch, Jr., A. L. Hunt, K. Moses, R. F. Post, and J. B. Taylor

1970-03-09T23:59:59.000Z

338

Supernova explosions, 511 keV photons, gamma ray bursts and mirror matter  

E-Print Network [OSTI]

There are three astroparticle physics puzzles which fire the imagination: the origin of the ``Great Positron Producer'' in the galactic bulge, the nature of the gamma-ray bursts central engine and the mechanism of supernova explosions. We show that the mirror matter model has the potential to solve all three of these puzzles in one beautifully simple strike.

R. Foot; Z. K. Silagadze

2004-04-27T23:59:59.000Z

339

Hardware Implementation of the Primary Mirror Surface Heating System for the Gemini 8 meter Telescopes  

E-Print Network [OSTI]

in nighttime ambient temperature. A development effort and subscale prototype testing of this technique axis). As the distance across the mirror changes, the voltages delivered to each electrode pair must. Accurately relaying this temperature data to the Primary Voltage Control system is essential in order to meet

340

Linear dispersion relation for the mirror instability in context of the gyrokinetic theory  

SciTech Connect (OSTI)

The linear dispersion relation for the mirror instability is discussed in context of the gyrokinetic theory. The objective is to provide a coherent view of different kinetic approaches used to derive the dispersion relation. The method based on gyrocenter phase space transformations is adopted in order to display the origin and ordering of various terms.

Porazik, Peter; Johnson, Jay R. [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08542 (United States)] [Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08542 (United States)

2013-10-15T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

The dual-mirror Small Size Telescope for the Cherenkov Telescope Array  

E-Print Network [OSTI]

In this paper, the development of the dual mirror Small Size Telescopes (SST) for the Cherenkov Telescope Array (CTA) is reviewed. Up to 70 SST, with a primary mirror diameter of 4 m, will be produced and installed at the CTA southern site. These will allow investigation of the gamma-ray sky at the highest energies accessible to CTA, in the range from about 1 TeV to 300 TeV. The telescope presented in this contribution is characterized by two major innovations: the use of a dual mirror Schwarzschild-Couder configuration and of an innovative camera using as sensors either multi-anode photomultipliers (MAPM) or silicon photomultipliers (SiPM). The reduced plate-scale of the telescope, achieved with the dual-mirror optics, allows the camera to be compact (40 cm in diameter), and low-cost. The camera, which has about 2000 pixels of size 6x6 mm^2, covers a field of view of 10{\\deg}. The dual mirror telescopes and their cameras are being developed by three consortia, ASTRI (Astrofisica con Specchi a Tecnologia Replicante Italiana, Italy/INAF), GATE (Gamma-ray Telescope Elements, France/Paris Observ.) and CHEC (Compact High Energy Camera, universities in UK, US and Japan) which are merging their efforts in order to finalize an end-to-end design that will be constructed for CTA. A number of prototype structures and cameras are being developed in order to investigate various alternative designs. In this contribution, these designs are presented, along with the technological solutions under study.

G. Pareschi; G. Agnetta; L. A. Antonelli; D. Bastieri; G. Bellassai; M. Belluso; C. Bigongiari; S. Billotta; B. Biondo; G. Bonanno; G. Bonnoli; P. Bruno; A. Bulgarelli; R. Canestrari; M. Capalbi; P. Caraveo; A. Carosi; E. Cascone; O. Catalano; M. Cereda; P. Conconi; V. Conforti; G. Cusumano; V. De Caprio; A. De Luca; A. Di Paola; F. Di Pierro; D. Fantinel; M. Fiorini; D. Fugazza; D. Gardiol; M. Ghigo; F. Gianotti; S. Giarrusso; E. Giro; A. Grillo; D. Impiombato; S. Incorvaia; A. La Barbera; N. La Palombara; V. La Parola; G. La Rosa; L. Lessio; G. Leto; S. Lombardi; F. Lucarelli; M. C. Maccarone; G. Malaguti; G. Malaspina; V. Mangano; D. Marano; E. Martinetti; R. Millul; T. Mineo; A. Mist; C. Morello; G. Morlino; M. R. Panzera; G. Rodeghiero; P. Romano; F. Russo; B. Sacco; N. Sartore; J. Schwarz; A. Segreto; G. Sironi; G. Sottile; A. Stamerra; E. Strazzeri; L. Stringhetti; G. Tagliaferri; V. Testa; M. C. Timpanaro; G. Toso; G. Tosti; M. Trifoglio; P. Vallania; S. Vercellone; V. Zitelli; For The Astri Collaboration; J. P. Amans; C. Boisson; C. Costille; J. L. Dournaux; D. Dumas; G. Fasola; O. Hervet; J. M. Huet; P. Laporte; C. Rulten; H. Sol; A. Zech; For The Gate Collaboration; R. White; J. Hinton; D. Ross; J. Sykes; S. Ohm; J. Schmoll; P. Chadwick; T. Greenshaw; M. Daniel; G. Cotter; G. S. Varner; S. Funk; J. Vandenbroucke; L. Sapozhnikov; J. Buckley; P. Moore; D. Williams; S. Markoff; J. Vink; D. Berge; N. Hidaka; A. Okumura; H. Tajima; For The Chec Collaboration; For The Cta Consortium

2013-07-18T23:59:59.000Z

342

Magnetic Catalysis vs Magnetic Inhibition  

E-Print Network [OSTI]

We discuss the fate of chiral symmetry in an extremely strong magnetic field B. We investigate not only quark fluctuations but also neutral meson effects. The former would enhance the chiral-symmetry breaking at finite B according to the Magnetic Catalysis, while the latter would suppress the chiral condensate once B exceeds the scale of the hadron structure. Using a chiral model we demonstrate how neutral mesons are subject to the dimensional reduction and the low dimensionality favors the chiral-symmetric phase. We point out that this effect, the Magnetic Inhibition, can be a feasible explanation for recent lattice-QCD data indicating the decreasing behavior of the chiral-restoration temperature with increasing B.

Kenji Fukushima; Yoshimasa Hidaka

2012-09-06T23:59:59.000Z

343

Magnetic Stereoscopy  

E-Print Network [OSTI]

The space mission STEREO will provide images from two viewpoints. An important aim of the STEREO mission is to get a 3D view of the solar corona. We develop a program for the stereoscopic reconstruction of 3D coronal loops from images taken with the two STEREO spacecraft. A pure geometric triangulation of coronal features leads to ambiguities because the dilute plasma emissions complicates the association of features in image 1 with features in image 2. As a consequence of these problems the stereoscopic reconstruction is not unique and multiple solutions occur. We demonstrate how these ambiguities can be resolved with the help of different coronal magnetic field models (potential, linear and non-linear force-free fields). The idea is that, due to the high conductivity in the coronal plasma, the emitting plasma outlines the magnetic field lines. Consequently the 3D coronal magnetic field provides a proxy for the stereoscopy which allows to eliminate inconsistent configurations. The combination of stereoscopy and magnetic modelling is more powerful than one of these tools alone. We test our method with the help of a model active region and plan to apply it to the solar case as soon as STEREO data become available.

Thomas Wiegelmann; Bernd Inhester

2006-12-21T23:59:59.000Z

344

On characterization and measurement of average solar field mirror reflectance in utility-scale concentrating solar power plants  

Science Journals Connector (OSTI)

Abstract Due to the emerging need for the development of acceptance test codes for commercial concentrating solar power (CSP) plants, an effort is made here to develop a mirror reflectance model suitable for CSP applications as well as a general procedure to measure the average mirror reflectance of a solar field. Typically, a utility-scale solar field includes hundreds of thousands of mirror panels (if not more), and their reflectance is subject to many factors, such as weather and planned washing schedule. The newly developed mirror reflectance model can be used to characterize different types of mirror materials and can be directly used to perform optical performance evaluation of solar collectors. The newly proposed procedure for average solar field reflectance measurements includes a baseline comprehensive measurement and an individual factor measurement: the former allows a comprehensive survey of mirror reflectance across the whole solar field, and the latter can provide correcting factors for selected individual factors to further improve the accuracy of the baseline measurements. A detailed test case implementing the general procedure is applied to a state-of-the-art commercial parabolic trough plant and validates the proposed mirror reflectance model and average reflectance measurement procedure. In the test case, the plant-wide reflectance measurements at a commercial utility-scale solar plant were conducted and can shed light on relevant analysis of CSP applications. The work can also be naturally applied to other types of solar plants, such as power towers and linear Fresnel plants.

Guangdong Zhu; David Kearney; Mark Mehos

2014-01-01T23:59:59.000Z

345

magnets2  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

II II Painless Physics Articles BEAM COOLING August 2, 1996 By Leila Belkora, Office of Public Affairs ACCELERATION August 16, 1996 By Dave Finley, Accelerator Division Head RF August 30, 1996 By Pat Colestock, Accelerator Division FIXED TARGET PHYSICS September 20, 1996 By Peter H. Garbincius, Physics Section FIXED TARGET PHYSICS PART DEUX October 16, 1996 By Peter H. Garbincius, Physics Section and Leila Belkora, Office of Public Affaris CROSS SECTION November 1, 1996 By Doreen Wackeroth, Theoretical Physics Edited by Leila Belkora, Office of Public Affaris MAGNETS PART I November 15, 1996 By Hank Glass, Technical Support Section Edited by Donald Sena, Office of Public Affairs MAGNETS PART II January 10, 1997 By Hank Glass, Technical Support Section Edited by Donald Sena, Office of Public Affairs

346

Magnetic Reconnection  

SciTech Connect (OSTI)

We review the fundamental physics of magnetic reconnection in laboratory and space plasmas, by discussing results from theory, numerical simulations, observations from space satellites, and the recent results from laboratory plasma experiments. After a brief review of the well-known early work, we discuss representative recent experimental and theoretical work and attempt to interpret the essence of significant modern findings. In the area of local reconnection physics, many significant findings have been made with regard to two- uid physics and are related to the cause of fast reconnection. Profiles of the neutral sheet, Hall currents, and the effects of guide field, collisions, and micro-turbulence are discussed to understand the fundamental processes in a local reconnection layer both in space and laboratory plasmas. While the understanding of the global reconnection dynamics is less developed, notable findings have been made on this issue through detailed documentation of magnetic self-organization phenomena in fusion plasmas. Application of magnetic reconnection physics to astrophysical plasmas is also brie y discussed.

Masaaki Yamada, Russell Kulsrud and Hantao Ji

2009-09-17T23:59:59.000Z

347

Modeling and optimization of operating parameters for a test-cell option of the Fusion Power Demonstration-II tandem mirror design  

SciTech Connect (OSTI)

Models of tandem mirror devices operated with a test-cell insert have been used to calculate operating parameters for FPD-II+T, an upgrade of the Fusion Power Demonstration-II device. Two test-cell configurations were considered, one accommodating two 1.5 m blanket test modules and the other having four. To minimize the cost of the upgrade, FPD-II+T utilizes the same coil arrangement and machine dimensions outside of the test cell as FPD-II, and the requirements on the end cell systems have been held near or below those for FPD-II. The maximum achievable test cell wall loading found for the short test-cell was 3.5 MW/m/sup 2/ while 6.0 MW/m/sup 2/ was obtainable in the long test-cell configuration. The most severe limitation on the achievable wall loading is the upper limit on test-cell beta set by MHD stability calculations. Modification of the shape of the magnetic field in the test-cell by improving the magnet design could raise this beta limit and lead to improved test-cell performance.

Haney, S.W.; Fenstermacher, M.E.

1985-04-03T23:59:59.000Z

348

Extreme ultra-violet movie camera for imaging microsecond time scale magnetic reconnection  

SciTech Connect (OSTI)

An ultra-fast extreme ultra-violet (EUV) movie camera has been developed for imaging magnetic reconnection in the Caltech spheromak/astrophysical jet experiment. The camera consists of a broadband Mo:Si multilayer mirror, a fast decaying YAG:Ce scintillator, a visible light block, and a high-speed visible light CCD camera. The camera can capture EUV images as fast as 3.3 10{sup 6} frames per second with 0.5 cm spatial resolution. The spectral range is from 20 eV to 60 eV. EUV images reveal strong, transient, highly localized bursts of EUV radiation when magnetic reconnection occurs.

Chai, Kil-Byoung; Bellan, Paul M. [Applied Physics, Caltech, 1200 E. California Boulevard, Pasadena, California 91125 (United States)] [Applied Physics, Caltech, 1200 E. California Boulevard, Pasadena, California 91125 (United States)

2013-12-15T23:59:59.000Z

349

Amazing Mirrors and Superlative Supercomputers | U.S. DOE Office of Science  

Office of Science (SC) Website

Amazing Amazing Mirrors and Superlative Supercomputers News Featured Articles 2014 2013 2012 2011 2010 2009 2008 2007 2006 2005 Science Headlines Presentations & Testimony News Archives Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 11.29.11 Amazing Mirrors and Superlative Supercomputers Argonne's Mira will accelerate scientific discoveries and societal benefits. Print Text Size: A A A Subscribe FeedbackShare Page Click to enlarge photo. Enlarge Photo Mira--Argonne's IBM Blue Gene/Q Courtesy of Argonne National Laboratory Argonne National Laboratory's IBM Blue Gene/Q supercomputer, Mira, is an engineering marvel whose unique architecture and capabilities will be thoroughly explored as soon as it goes online in 2012. Supported by the

350

Schwarzschild-Couder two-mirror telescope for ground-based gamma-ray astronomy  

E-Print Network [OSTI]

Schwarzschild-type aplanatic telescopes with two aspheric mirrors, configured to correct spherical and coma aberrations, are considered for application in gamma-ray astronomy utilizing the ground-based atmospheric Cherenkov technique. We use analytical descriptions for the figures of primary and secondary mirrors and, by means of numerical ray-tracing, we find telescope configurations which minimize astigmatism and maximize effective light collecting area. It is shown that unlike the traditional prime-focus Davies-Cotton design, such telescopes provide a solution for wide field of view gamma-ray observations. The designs are isochronous, can be optimized to have no vignetting across the field, and allow for significant reduction of the plate scale, making them compatible with finely-pixilated cameras, which can be constructed from modern, cost-effective image sensors such as multi-anode PMTs, SiPMs, or image intensifiers.

Vasilev, V V

2007-01-01T23:59:59.000Z

351

Photothermal and thermo-refractive effects in high reflectivity mirrors at room and cryogenic temperature  

E-Print Network [OSTI]

Increasing requirements in the sensitivity of interferometric measurements is a common feature of several research fields, from gravitational wave detection to quantum optics. This motivates refined studies of high reflectivity mirrors and of noise sources that are tightly related to their structure. In this work we present an experimental characterization of photothermal and thermo-refractive effects in high reflectivity mirrors, i.e., of the variations in the position of their effective reflection plane due to weak residual power absorption. The measurements are performed by modulating the impinging power in the range 10 Hz $\\div$ 100 kHz. The experimental results are compared with an expressly derived theoretical model in order to fully understand the phenomena and exploit them to extract useful effective thermo-mechanical parameters of the coating. The measurements are extended at cryogenic temperature, where most high sensitivity experiments are performed (or planned in future versions) and where characterizations of dielectric film coatings are still poor.

Alessandro Farsi; Mario Siciliani de Cumis; Francesco Marino; Francesco Marin

2011-09-21T23:59:59.000Z

352

Vectorial velocity filter for ultracold neutrons based on a surface-disordered mirror system  

Science Journals Connector (OSTI)

We perform classical three-dimensional Monte Carlo simulations of ultracold neutrons scattering through an absorbing-reflecting mirror system in the Earth's gravitational field. We show that the underlying mixed phase space of regular skipping motion and random motion due to disorder scattering can be exploited to realize a vectorial velocity filter for ultracold neutrons. The absorbing-reflecting mirror system proposed allows beams of ultracold neutrons with low angular divergence to be formed. The range of velocity components can be controlled by adjusting the geometric parameters of the system. First experimental tests of its performance are presented. One potential future application is the investigation of transport and scattering dynamics in confined systems downstream of the filter.

L. A. Chizhova; S. Rotter; T. Jenke; G. Cronenberg; P. Geltenbort; G. Wautischer; H. Filter; H. Abele; J. Burgdrfer

2014-03-10T23:59:59.000Z

353

Nonlinear ion-cyclotron waves in mirror machines. Paper IAEA-CN-38/S-1  

SciTech Connect (OSTI)

Experimental results on ion-cyclotron waves observed in the 2XIIB mirror machine are reviewed, and relevant theoretical work is discussed. The work reported generally substantiates the quasilinear diffusion model of mirror-plasma confinement, but also suggests alternatives. The end-loss current required by theory of the drift-cyclotron loss-cone (DCLC) instability agrees with measurements of this current. The experiment indicates that an increased ratio of plasma radius to ion gyroradius improves plasma confinement. However, measurements sometimes show a second ion-cyclotron mode, which is not the DCLC mode. Theoretical work on loss-cone instabilities has concentrated on linear, quasilinear, and fully nonlinear models of increased sophistication and experimental applicability.

Cohen, B.I.; Smith, G.R.; Berk, H.L.

1980-05-22T23:59:59.000Z

354

Schwarzschild-Couder two-mirror telescope for ground-based gamma-ray astronomy  

E-Print Network [OSTI]

Schwarzschild-type aplanatic telescopes with two aspheric mirrors, configured to correct spherical and coma aberrations, are considered for application in gamma-ray astronomy utilizing the ground-based atmospheric Cherenkov technique. We use analytical descriptions for the figures of primary and secondary mirrors and, by means of numerical ray-tracing, we find telescope configurations which minimize astigmatism and maximize effective light collecting area. It is shown that unlike the traditional prime-focus Davies-Cotton design, such telescopes provide a solution for wide field of view gamma-ray observations. The designs are isochronous, can be optimized to have no vignetting across the field, and allow for significant reduction of the plate scale, making them compatible with finely-pixilated cameras, which can be constructed from modern, cost-effective image sensors such as multi-anode PMTs, SiPMs, or image intensifiers.

V. V. Vassiliev; S. J. Fegan

2007-08-21T23:59:59.000Z

355

Effect of Unresponsive Time for Users Touch Action of Selecting an Icon on the Video Mirror Interface  

Science Journals Connector (OSTI)

Contactless input methods implementing body motion allow users to control computer systems easily and enjoyably. We focus on the video mirror interface as an example of these methods. A user of the video mir...

Kazuyoshi Murata; Masatsugu Hattori

2013-01-01T23:59:59.000Z

356

Design and development of a 329-segment tip-tilt piston mirror array for space-based adaptive optics  

E-Print Network [OSTI]

Design and development of a 329-segment tip-tilt piston mirror array for space-based adaptive. It consists of 329-hexagonal segments on a 600 m pitch, each with tip/tilt and piston degrees of freedom

357

Compact scanning soft-x-ray microscope using a laser-produced plasma source and normal-incidence multilayer mirrors  

Science Journals Connector (OSTI)

We have constructed a scanning soft-x-ray microscope that uses a laser-produced plasma as the soft-x-ray source and normal-incidence multilayer-coated mirrors in a Schwarzschild...

Trail, J A; Byer, R L

1989-01-01T23:59:59.000Z

358

Relation between Group Delay, Energy Storage and Absorbed/Scattered Power in Highly Reflective Dispersive Dielectric Mirror Coatings  

Science Journals Connector (OSTI)

We show that the reflection group delay as well as the absorption/scattering loss of a dielectric multilayer mirror is proportional to the energy stored in such 1-D photonic bandgap...

Szipocs, Rbert; Antal, Peter

359

Simbol-X Hard X-ray Focusing Mirrors: Results Obtained During the Phase A Study  

SciTech Connect (OSTI)

Simbol-X will push grazing incidence imaging up to 80 keV, providing a strong improvement both in sensitivity and angular resolution compared to all instruments that have operated so far above 10 keV. The superb hard X-ray imaging capability will be guaranteed by a mirror module of 100 electroformed Nickel shells with a multilayer reflecting coating. Here we will describe the technogical development and solutions adopted for the fabrication of the mirror module, that must guarantee an Half Energy Width (HEW) better than 20 arcsec from 0.5 up to 30 keV and a goal of 40 arcsec at 60 keV. During the phase A, terminated at the end of 2008, we have developed three engineering models with two, two and three shells, respectively. The most critical aspects in the development of the Simbol-X mirrors are i) the production of the 100 mandrels with very good surface quality within the timeline of the mission, ii) the replication of shells that must be very thin (a factor of 2 thinner than those of XMM-Newton) and still have very good image quality up to 80 keV, iii) the development of an integration process that allows us to integrate these very thin mirrors maintaining their intrinsic good image quality. The Phase A study has shown that we can fabricate the mandrels with the needed quality and that we have developed a valid integration process. The shells that we have produced so far have a quite good image quality, e.g. HEW < or approx. 30 arcsec at 30 keV, and effective area. However, we still need to make some improvements to reach the requirements. We will briefly present these results and discuss the possible improvements that we will investigate during phase B.

Tagliaferri, G.; Basso, S.; Civitani, M.; Conconi, P.; Cotroneo, V.; Pareschi, G.; Spiga, D. [INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate (Italy); Borghi, G.; Garoli, D.; Mattarello, V.; Orlandi, A.; Valsecchi, G.; Vernani, D. [Media Lario Technologies S.r.l., Localita Pascolo, 23842 Bosisio Parini (Italy); Burkert, W.; Freyberg, M.; Hartner, G. [Max-Planck-Institut fuer Extraterrestrische Physik, Giessenbachstr. 1, 85748 Garching (Germany); Citterio, O. [INAF-Osservatorio Astronomico di Brera, Via Bianchi 46, 23807 Merate (Italy); Media Lario Technologies S.r.l., Localita Pascolo, 23842 Bosisio Parini (Italy); Gorenstein, P.; Romaine, S. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2009-05-11T23:59:59.000Z

360

Advanced ultraviolet-resistant silver mirrors for use in solar reflectors  

DOE Patents [OSTI]

A silver mirror construction that maintains a high percentage of hemispherical reflectance throughout the UV and visible spectrum when used in solar reflectors, comprising:a) a pressure sensitive adhesive layer positioned beneath a silver overlay;b) a polymer film disposed on the silver overlay;c) an adhesive layer positioned on the polymer film; andd) a UV screening acrylic film disposed on the adhesive layer.

Jorgensen, Gary J. (Pine, CO); Gee, Randy (Arvada, CO)

2009-11-03T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Mirroring or Muscling: An Examination of State Class Action Appellate Rulemaking  

E-Print Network [OSTI]

class action appeals even before Rule 23(f), and appear to have been more amenable to amending their class action rules post-Rule 23(f) to provide greater levels of appellate access. But the flexing of interest group muscles does not wholly explain...HINES GALLEY 5/27/2010 9:26:06 AM Mirroring or Muscling: An Examination of State Class Action Appellate Rulemaking Laura J. Hines ? I. INTRODUCTION This Symposium focuses on the developments in aggregate litigation since Amchem...

Hines, Laura J.

2010-05-01T23:59:59.000Z

362

A microwave tomography system using a tunable mirror for beam steering  

SciTech Connect (OSTI)

Microwave tomography is a fast-growing technique in the fields of NDE and medical industry. This paper presents a new microwave tomography system which reduces the complexities of conventional microwave imaging systems by utilizing a reconfigurable mirror, a tunable reflectarray antenna. In order to build a tunable reflectarray with beam steering capabilities, the unit cell characteristics should dynamically alter. Modelling and experimental results of a single unit cell are presented in this work.

Tayebi, A. [Department of Electrical and Computer Engineering, College of Engineering, Michigan State University, East Lansing, MI 48824 (United States); Non-Destructive Evaluation Laboratory, Michigan State University, East Lansing, MI 48824 (United States); Department of Physic (United States); Tang, J. [Department of Electrical and Computer Engineering, College of Engineering, Michigan State University, East Lansing, MI 48824 (United States); Paladhi, P. Roy; Udpa, L.; Udpa, S. [Department of Electrical and Computer Engineering, College of Engineering, Michigan State University, East Lansing, MI 48824 (United States); Non-Destructive Evaluation Laboratory, Michigan State University, East Lansing, MI 48824 (United States)

2014-02-18T23:59:59.000Z

363

Production of large-radius, high-beta, confined mirror plasmas  

Science Journals Connector (OSTI)

This paper reports results of experiments in which mirror-confined plasmas with radii as high as 7 ion gyro-radii are produced and maintained by neutral-beam injection. In these plasmas, betas as high as 0.45 were achieved and limited only by the available neutral-beam power. Electron temperature and ion-energy confinement increased with larger plasma size.

D.L. Correll; J.H. Clauser; F.H. Coensgen; W.F. Cummins; R.P. Drake; J.H. Foote; A.H. Futch; R.K. Goodman; D.P. Grubb; G.M. Melin; W.E. Nexsen; T.C. Simonen; B.W. Stallard; W.C. Turner

1980-01-01T23:59:59.000Z

364

The Transatlantic Mirror: Effects of the American Image on Postwar British Identity  

E-Print Network [OSTI]

#8; #8; #8; #8;#8;#8; #12;ABSTRACT The Transatlantic Mirror: Effects of the American Image on Postwar British Identity (April 2007) Philip Evans Department of English Texas A&M University Fellows Advisor: Dr. Elizabeth Ho... that is transatlantic in its scope, which is also the approach the remaining discussion will follow. At first this inspection was concerned with the formation of an American identity by the British, but in studying the changing characterization of American identity...

Evans, Philip

2007-08-03T23:59:59.000Z

365

A review of "The Public Mirror: Molire and the Social Commerce of Depiction." by Larry F. Norman  

E-Print Network [OSTI]

of the characters to the comic mirror indicate not only the power of its image, but also the forcefulness of the spectators? resistance to it. Norman discusses two levels that are present in theatrical performance: the level of ?representation? or ?spectacle... of the characters to the comic mirror indicate not only the power of its image, but also the forcefulness of the spectators? resistance to it. Norman discusses two levels that are present in theatrical performance: the level of ?representation? or ?spectacle...

Kiki Gounaridou

2002-01-01T23:59:59.000Z

366

Magnetic Reconnection in Astrophysical and  

E-Print Network [OSTI]

Magnetic Reconnection in Astrophysical and Laboratory Plasmas Ellen G. Zweibel1 and Masaaki Yamada2 astrophysics, magnetic fields, magnetic reconnection Abstract Magnetic reconnection is a topological rearrangement of magnetic field that converts magnetic energy to plasma energy. Astrophysical flares, from

367

Electronic Structure and Magnetism in Diluted Magnetic Semiconductors  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Electronic Structure and Magnetism in Diluted Magnetic Semiconductors Electronic Structure and Magnetism in Diluted Magnetic Semiconductors Print Wednesday, 29 November 2006 00:00...

368

National High Magnetic Field Laboratory Audio Dictionary: Magnetic...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Links Magnets from Mini to Mighty Meet the Magnets How to Make an Electromagnet (audio slideshow) Compasses in Magnetic Fields (interactive tutorial) Magnetic Field Around a...

369

Design and analysis of the internally cooled silicon mirrors and benders for wiggler sources at the Advanced Photon Source  

SciTech Connect (OSTI)

When silicon single crystal mirrors are bent to cylindrical figures of typically 6 km bending radius, the moments needed are very small and easy to disturb by cooling attachments to the sides of the mirror. Hence, we decided to abandon the conventional concept of cooling plates attached to the sides of the mirrors and instead have chosen to use internal water channels. We present here the design of mirrors with cooling channels near the neutral axis of the silicon beam that have a rather thick {open_quote}{open_quote}hot wall.{close_quote}{close_quote} The results of this analytical work are nonintuitive, regarding the stresses produced by wiggler heating. The design path chosen minimizes figure errors due to coolant pressure variations and residual stresses from machining and bonding of multiple layers of silicon. The geometry of the water channels avoids water-to-vacuum seals and uses the mirror bender as the coolant manifold. Engineering efforts, which reduce the bending stresses at bender-to-silicon interface by a factor of five, will be presented. The complete mirror bender and motion control mechanics will be shown. {copyright} {ital 1996 American Institute of Physics.}

Schildkamp, W.; Jaski, Y. [Consortium for Advanced Radiation Sources, University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637 (United States)] [Consortium for Advanced Radiation Sources, University of Chicago, 5640 S. Ellis Ave., Chicago, IL 60637 (United States); Tonnessen, T.; Douglas, G. [Rocketdyne Albuquerque Operations, 2511 C. Broadbent Parkway, N.E., Albuquerque, NM 87107 (United States)] [Rocketdyne Albuquerque Operations, 2511 C. Broadbent Parkway, N.E., Albuquerque, NM 87107 (United States)

1996-09-01T23:59:59.000Z

370

Superconducting magnet  

DOE Patents [OSTI]

A superconducting magnet designed to produce magnetic flux densities of the order of 4 to 5 Webers per square meter is constructed by first forming a cable of a plurality of matrixed superconductor wires with each wire of the plurality insulated from each other one. The cable is shaped into a rectangular cross-section and is wound with tape in an open spiral to create cooling channels. Coils are wound in a calculated pattern in saddle shapes to produce desired fields, such as dipoles, quadrupoles, and the like. Wedges are inserted between adjacent cables as needed to maintain substantially radial placement of the long dimensions of cross sections of the cables. After winding, individual strands in each of the cables are brought out to terminals and are interconnected to place all of the strands in series and to maximize the propagation of a quench by alternating conduction from an inner layer to an outer layer and from top half to bottom half as often as possible. Individual layers are separated from others by spiraled aluminum spacers to facilitate cooling. The wound coil is wrapped with an epoxy tape that is cured by heat and then machined to an interference fit with an outer aluminum pipe which is then affixed securely to the assembled coil by heating it to make a shrink fit. In an alternate embodiment, one wire of the cable is made of copper or the like to be heated externally to propagate a quench.

Satti, John A. (Naperville, IL)

1980-01-01T23:59:59.000Z

371

Study of magnetic configuration effects on plasma boundary and measurement of edge electron density in the spherical tokamak compact plasma wall interaction experimental device using Li sheet beam  

SciTech Connect (OSTI)

Two-dimensional lithium beam imaging technique has been applied in the spherical tokamak CPD (compact plasma wall interaction experimental device) to study the effects of magnetic field configurations on rf plasma boundary in the absence of any plasma current, and also for the measurement of a two-dimensional edge electron density profile. With the present working condition of the diagnostics, the minimum measured electron density can be {approx}1.0x10{sup 16} m{sup -3}; this is considered to be the definition for the plasma boundary. The performance of the lithium sheet beam is absolutely calibrated using a quartz crystal monitor. Experimental results reveal that magnetic field configuration, either mirror or so-called null, critically affects the rf plasma boundary. A sharp lower boundary is found to exist in magnetic null configuration, which is quite different from that in the weak mirror configuration. Theoretical calculations of particle drift orbit and magnetic connection length (wall-to-wall) suggest that only mirror trapped particles are confined within a region where the magnetic connection length is {approx}4.0 m or more. A two-dimensional edge electron density profile is obtained from the observed Li I intensity profile. Overdense plasma formation is discussed from the viewpoint of mode conversion of rf wave into electron Bernstein wave and its dependence on the electron density profile.

Bhattacharyay, R.; Inada, Y.; Kikukawa, T.; Watanabe, S.; Sasaki, K.; Ryoukai, T. [Interdisciplinary Graduate School of Engineering Science, Kyushu University, Kasuga, Fukuoka 816 8580 (Japan); Zushi, H.; Hasegawa, M.; Hanada, K.; Sato, K. N.; Nakamura, K.; Sakamoto, M.; Idei, H.; Yoshinaga, T.; Kawasaki, S.; Nakashima, H.; Higashijima, A. [Research Institute of Applied Mechanics, Kyushu University, Kasuga, Fukuoka 816 8580 (Japan); Morisaki, T. [National Institute for Fusion Science, Toki 509 5292 (Japan)

2008-02-15T23:59:59.000Z

372

Study of magnetic configuration effects on plasma boundary and measurement of edge electron density in the spherical tokamak compact plasma wall interaction experimental device using Li sheet beam  

Science Journals Connector (OSTI)

Two-dimensional lithium beam imaging technique has been applied in the spherical tokamak CPD (compact plasma wall interaction experimental device) to study the effects of magnetic field configurations on rf plasma boundary in the absence of any plasma current and also for the measurement of a two-dimensional edge electron density profile. With the present working condition of the diagnostics the minimum measured electron density can be ? 1.0 10 16 m ? 3 ; this is considered to be the definition for the plasma boundary. The performance of the lithium sheet beam is absolutely calibrated using a quartz crystal monitor. Experimental results reveal that magnetic field configuration either mirror or so-called null critically affects the rf plasma boundary. A sharp lower boundary is found to exist in magnetic null configuration which is quite different from that in the weak mirror configuration. Theoretical calculations of particle drift orbit and magnetic connection length (wall-to-wall) suggest that only mirror trapped particles are confined within a region where the magnetic connection length is ? 4.0 m or more. A two-dimensional edge electron density profile is obtained from the observed Li I intensity profile. Overdense plasma formation is discussed from the viewpoint of mode conversion of rf wave into electron Bernstein wave and its dependence on the electron density profile.

R. Bhattacharyay; H. Zushi; T. Morisaki; Y. Inada; T. Kikukawa; S. Watanabe; K. Sasaki; T. Ryoukai; M. Hasegawa; K. Hanada; K. N. Sato; K. Nakamura; M. Sakamoto; H. Idei; T. Yoshinaga; S. Kawasaki; H. Nakashima; A. Higashijima

2008-01-01T23:59:59.000Z

373

Magnet tests and status of the superconducting electron cyclotron resonance source SERSE  

SciTech Connect (OSTI)

At Laboratorio Nazionale del Sud a superconducting 14.5 GHz electron cyclotron resonance (ECR) source will be used as injector for the K-800 superconducting cyclotron. The original project of its magnetic system has been upgraded by taking into account the results of the high B mode operation of the 6.4 GHz SC-ECRIS at MSU-NSCL and now the mirror field may achieve 2.7 T, which is much higher than the confining field of any other ECR source. The magnet design will allow us to operate in a wide range of magnetic configurations making it easy to tune the source. The status of the project will be outlined and the preliminary results of the tests of the superconducting magnets will be described. A brief description of the tests to be carried out on the source during the first period of operation on the test bench in Grenoble follows. {copyright} {ital 1996 American Institute of Physics.}

Ciavola, G.; Gammino, S.; Cafici, M.; Castro, M.; Chines, F.; Marletta, S. [INFN-Laboratorio Nazionale del Sud, Via S. Sofia 44, 95123 Catania (Italy)] [INFN-Laboratorio Nazionale del Sud, Via S. Sofia 44, 95123 Catania (Italy); Alessandria, F. [INFN-LASA, Via F.lli Cervi 201, 20090 Segrate (Midway Islands) (Italy)] [INFN-LASA, Via F.lli Cervi 201, 20090 Segrate (Midway Islands) (Italy); Bourg, F.; Briand, P.; Melin, G.; Lagnier, R.; Seyfert, P. [CEA-Departement de Recherche Fondamentale sur la Matiere Condensee, Centre detudes Nucleaires de Grenoble, 38054 Grenoble Cedex 9 (France)] [CEA-Departement de Recherche Fondamentale sur la Matiere Condensee, Centre detudes Nucleaires de Grenoble, 38054 Grenoble Cedex 9 (France); Gaggero, G.; Losasso, M.; Penco, R. [ANSALDO-GIE, Via N. Lorenzi 8, 16152 Genova (Italy)] [ANSALDO-GIE, Via N. Lorenzi 8, 16152 Genova (Italy)

1996-03-01T23:59:59.000Z

374

Learning About Magnets!  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

by the National High Magnetic Field Laboratory Learning About Name A magnet is a material or object that creates a magnetic fi eld. This fi eld is invisible, but it creates a...

375

Interface Magnetism in Multiferroics  

E-Print Network [OSTI]

1.2.1 Magnetism . . . . . . . . . . . . . . . . . . . 1.2.2domain walls . . . . . 3 Magnetism of domain walls in BiFeOof electrical control of magnetism in mixed phase BiFeO 3

He, Qing

2011-01-01T23:59:59.000Z

376

Hydrogen atom in crossed electric and magnetic fields: Phase space topology and torus quantization via periodic orbits  

E-Print Network [OSTI]

A hierarchical ordering is demonstrated for the periodic orbits in a strongly coupled multidimensional Hamiltonian system, namely the hydrogen atom in crossed electric and magnetic fields. It mirrors the hierarchy of broken resonant tori and thereby allows one to characterize the periodic orbits by a set of winding numbers. With this knowledge, we construct the action variables as functions of the frequency ratios and carry out a semiclassical torus quantization. The semiclassical energy levels thus obtained agree well with exact quantum calculations.

Stephan Gekle; Jrg Main; Thomas Bartsch; T. Uzer

2006-10-02T23:59:59.000Z

377

Femtosecond Opto-Magnetism  

Science Journals Connector (OSTI)

We demonstrate that circularly polarized laser pulses may selectively excite different modes of magnetic resonance, realize quantum control of magnons, trigger magnetic phase...

Kimel, Alexey; Kirilyuk, A; Rasing, Th

378

A cryogenic liquid-mirror telescope on the moon to study the early universe  

E-Print Network [OSTI]

We have studied the feasibility and scientific potential of zenith observing liquid mirror telescopes having 20 to 100 m diameters located on the moon. They would carry out deep infrared surveys to study the distant universe and follow up discoveries made with the 6 m James Webb Space Telescope (JWST), with more detailed images and spectroscopic studies. They could detect objects 100 times fainter than JWST, observing the first, high-red shift stars in the early universe and their assembly into galaxies. We explored the scientific opportunities, key technologies and optimum location of such telescopes. We have demonstrated critical technologies. For example, the primary mirror would necessitate a high-reflectivity liquid that does not evaporate in the lunar vacuum and remains liquid at less than 100K: We have made a crucial demonstration by successfully coating an ionic liquid that has negligible vapor pressure. We also successfully experimented with a liquid mirror spinning on a superconducting bearing, as will be needed for the cryogenic, vacuum environment of the telescope. We have investigated issues related to lunar locations, concluding that locations within a few km of a pole are ideal for deep sky cover and long integration times. We have located ridges and crater rims within 0.5 degrees of the North Pole that are illuminated for at least some sun angles during lunar winter, providing power and temperature control. We also have identified potential problems, like lunar dust. Issues raised by our preliminary study demand additional in-depth analyses. These issues must be fully examined as part of a scientific debate we hope to start with the present article.

Roger Angel; Simon P. Worden; Ermanno F. Borra; Daniel J. Eisenstein; Bernard Foing; Paul Hickson; Jean-Luc Josset; Ki Bui Ma; Omar Seddiki; Suresh Sivanandam; Simon Thibault; Paul van Susante

2008-06-13T23:59:59.000Z

379

Enhanced visible and near-infrared capabilities of the JET mirror-linked divertor spectroscopy system  

SciTech Connect (OSTI)

The mirror-linked divertor spectroscopy diagnostic on JET has been upgraded with a new visible and near-infrared grating and filtered spectroscopy system. New capabilities include extended near-infrared coverage up to 1875 nm, capturing the hydrogen Paschen series, as well as a 2 kHz frame rate filtered imaging camera system for fast measurements of impurity (Be II) and deuterium D?, D?, D? line emission in the outer divertor. The expanded system provides unique capabilities for studying spatially resolved divertor plasma dynamics at near-ELM resolved timescales as well as a test bed for feasibility assessment of near-infrared spectroscopy.

Lomanowski, B. A., E-mail: b.a.lomanowski@durham.ac.uk; Sharples, R. M. [Centre for Advanced Instrumentation, Department of Physics, Durham University, Durham DH1 3LE (United Kingdom); Meigs, A. G.; Conway, N. J.; Zastrow, K.-D.; Heesterman, P.; Kinna, D. [EURATOM/CCFE Fusion Association, Culham Science Center, Abingdon OX14 3DB (United Kingdom); Collaboration: JET-EFDA Team

2014-11-15T23:59:59.000Z

380

Principles of passive and active cooling of mirror-based hybrid systems employing liquid metals  

SciTech Connect (OSTI)

This paper presents principles of passive and active cooling that are suitable to mirrorbased hybrid, nuclear fission/fusion systems. It is shown that liquid metal lead-bismuth cooling of the mirror machine with 25 m height and 1.5 GW thermal power is feasible both in the active mode during the normal operation and in the passive mode after the reactor shutdown. In the active mode the achievable required pumping power can well be below 50 MW, whereas the passive mode provides enough coolant flow to keep the clad temperature below the damage limits.

Anglart, Henryk [Div. of Nuclear Technology, School of Engineering Sciences, Royal Institute of Technology Roslagstullsbacken 21, 106-91 Stockholm (Sweden)

2012-06-19T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

A Mirror of Our World: Google Earth and the History of Cartography  

E-Print Network [OSTI]

Hak Saeng, preface to his untitled manuscript atlas of China during the Ming Dynasty, dated 1721. Quoted on Library of Congress, Geography and Map Division, Atlas page: http://www.loc.gov/rr/geogmap/ guide/gmillatl.html. file...Coordinates Series B, No. 12 A Mirror of Our World: Google Earth and the History of Cartography Persistent URL for citation: http://purl.oclc.org/ coordinates/b12.pdf Date of Publication: 08/20/09 David Y. Allen David Y. Allen (e...

Allen, David Y.

2009-08-20T23:59:59.000Z

382

Steady state whistler turbulence and stability of thermal barriers in tandem mirrors  

Science Journals Connector (OSTI)

The effect of the whistler turbulence on anisotropic electrons in a thermal barrier is examined. The electron distribution function is derived self?consistently by solving the steady state quasilinear diffusion equation. Saturated amplitudes are computed using the resonance broadening theory or convective stabilization. Estimated power levels necessary for sustaining the steady state of a strongly anisotropic electron population are found to exceed by orders of magnitude the estimates based on FokkerPlanck calculations for the range of parameters of tandem mirror (TMX?U and MFTF?B) experiments [Nucl. Fusion 2 5 1205 (1985)]. Upper limits on the allowed degree of anisotropy for existing power densities are calculated.

C. Litwin; R. N. Sudan

1986-01-01T23:59:59.000Z

383

Steady state whistler turbulence and stability of thermal barriers in tandem mirrors  

SciTech Connect (OSTI)

The effect of the whistler turbulence on anisotropic electrons in a thermal barrier is examined. The electron distribution function is derived self-consistently by solving the steady state quasilinear diffusion equation. Saturated amplitudes are computed using the resonance broadening theory or convective stabilization. Estimated power levels necessary for sustaining the steady state of a strongly anisotropic electron population are found to exceed by orders of magnitude the estimates based on Fokker--Planck calculations for the range of parameters of tandem mirror (TMX-U and MFTF-B) experiments (Nucl. Fusion 25, 1205 (1985)). Upper limits on the allowed degree of anisotropy for existing power densities are calculated.

Litwin, C.; Sudan, R.N.

1986-11-01T23:59:59.000Z

384

TMX tandem-mirror experiments and thermal-barrier theoretical studies  

SciTech Connect (OSTI)

This paper describes recent analysis of energy confinement in the Tandem Mirror Experiment (TMX). TMX data also indicates that warm plasma limits the amplitude of the anisotropy driven Alfven ion cyclotron (AIC) mode. Theoretical calculations show strong AIC stabilization with off-normal beam injection as planned in TMX-U and MFTF-B. This paper reports results of theoretical analysis of hot electrons in thermal barriers including electron heating calculations by Monte Carlo and Fokker-Planck codes and analysis of hot electron MHD and microinstability. Initial results from the TMX-U experiment are presented which show the presence of sloshing ions.

Simonen, T.C.; Baldwin, D.E.; Allen, S.L.

1982-07-29T23:59:59.000Z

385

The ASTRI Project: a mini-array of dual-mirror small Cherenkov telescopes for CTA  

E-Print Network [OSTI]

ASTRI is a flagship project of the Italian Ministry of Education, University and Research, which aims to develop an end-to-end prototype of the CTA small-size telescope. The proposed design is characterized by a dual-mirror Schwarzschild-Couder configuration and a camera based on Silicon photo-multipliers, two challenging but innovative technological solutions which will be adopted for the first time on a Cherenkov telescope. Here we describe the current status of the project, the expected performance and the possibility to realize a mini-array composed by a few small-size telescopes, which shall be placed at the final CTA Southern Site.

La Palombara, N; Antonelli, L A; Bastieri, D; Bellassai, G; Belluso, M; Bigongiari, C; Billotta, S; Biondo, B; Bonanno, G; Bonnoli, G; Bruno, P; Bulgarelli, A; Canestrari, R; Capalbi, M; Caraveo, P; Carosi, A; Cascone, E; Catalano, O; Cereda, M; Conconi, P; Conforti, V; Cusumano, G; De Caprio, V; De Luca, A; Di Paola, A; Di Pierro, F; Fantinel, D; Fiorini, M; Fugazza, D; Gardiol, D; Ghigo, M; Gianotti, F; Giarrusso, S; Giro, E; Grillo, A; Impiombato, D; Incorvaia, S; La Barbera, A; La Parola, V; La Rosa, G; Lessio, L; Leto, G; Lombardi, S; Lucarelli, F; Maccarone, M C; Malaguti, G; Malaspina, G; Mangano, V; Marano, D; Martinetti, E; Millul, R; Mineo, T; Mist, A; Morello, C; Morlino, G; Panzera, M R; Pareschi, G; Rodeghiero, G; Romano, P; Russo, F; Sacco, B; Sartore, N; Schwarz, J; Segreto, A; Sironi, G; Sottile, G; Stamerra, A; Strazzeri, E; Stringhetti, L; Tagliaferri, G; Testa, V; Timpanaro, M C; Toso, G; Tosti, G; Trifoglio, M; Vallania, P; Vercellone, S; Zitelli, V

2013-01-01T23:59:59.000Z

386

Durable silver mirror with ultra-violet thru far infra-red reflection  

DOE Patents [OSTI]

A durable highly reflective silver mirror characterized by high reflectance in a broad spectral range of about 300 nm in the UV to the far infrared (.about.10000 nm), as well as exceptional environmental durability. A high absorptivity metal underlayer is used which prevents the formation of a galvanic cell with a silver layer while increasing the reflectance of the silver layer. Environmentally durable overcoat layers are provided to enhance mechanical and chemical durability and protect the silver layer from corrosion and tarnishing, for use in a wide variety of surroundings or climates, including harsh or extreme environments.

Wolfe, Jesse D. (Discovery Bay, CA)

2010-11-23T23:59:59.000Z

387

Quadrupole magnets measurement  

SciTech Connect (OSTI)

A rotating coil setup is designed for quadrupole magnet measurement at the Accelerator Test Facility (ATF); Hall probe measurement was also performed for one of each type of quadrupole magnet. Both mechanical and magnetic properties of the quadrupole magnets were measured, the results are reported here. 5 refs., 12 figs., 12 tabs.

Wang, Xijie (California Univ., Los Angeles, CA (USA). Center for Advanced Accelerators Physics); Sylvester, C. (Brookhaven National Lab., Upton, NY (USA))

1991-01-01T23:59:59.000Z

388

Magnetic Imaging Wolfgang Kuch  

E-Print Network [OSTI]

Magnetic Imaging Wolfgang Kuch Freie Universit¨at Berlin, Institut f¨ur Experimentalphysik, Arnimallee 14, 14195 Berlin, Germany kuch@physik.fu-berlin.de Abstract. Imaging of magnetic domains has- ern techniques is used nowadays routinely for magnetic imaging of magnetic ma- terials

Kuch, Wolfgang

389

Magnetism in Nanocrystalline Gold  

Science Journals Connector (OSTI)

Magnetism in Nanocrystalline Gold ... Bridging the current gap in experimental study of magnetism in bare gold nanomaterials, we report here on magnetism in gold nanocrystalline films produced by cluster deposition in the aggregate form that can be considered as a crossover state between a nanocluster and a continuous film. ... gold; nanocrystalline film; magnetism; cluster deposition; SQUID magnetometry ...

Vladimir Tuboltsev; Alexander Savin; Alexandre Pirojenko; Jyrki Risnen

2013-07-07T23:59:59.000Z

390

Magnetism of spiral galaxies  

Science Journals Connector (OSTI)

... magnetic fields of spiral galaxies has taken a special place in the study of cosmic magnetism, but magnetic fields are a universal property of all galactic-type objects, as is ... . The past ten years have been notable for rapid, qualitative progress in understanding the magnetism of spiral galaxies, a result of both theoretical and observational developments. A few decades ...

Alexander Ruzmaikin; Dmitry Sokoloff; Anvar Shukurov

1988-11-24T23:59:59.000Z

391

Magnetism in microquasars  

Science Journals Connector (OSTI)

...Lynden-Bell, E. R. Priest and N. O. Weiss Magnetism in microquasars I. F. Mirabel Centre...binaries|magnetic field|plasma physics| Magnetism in microquasars By I. F. Mirabel Centre...Trans. R. Soc. Lond. A (2000) Magnetism in microquasars 843 At rst glance it...

2000-01-01T23:59:59.000Z

392

Early History of Magnetism  

Science Journals Connector (OSTI)

... 2, Dr. J. B. Kramer read a paper on The Early History of Magnetism, in which he discussed the various accounts of the first discovery of a magnet ... accounts of the first discovery of a magnet, and the development of the science of magnetism down to A.D. 1600. His remarks were divided into five sections, the ...

1932-03-19T23:59:59.000Z

393

Excitons in a mirror: Formation of optical bilayers using MoS{sub 2} monolayers on gold substrates  

SciTech Connect (OSTI)

We report coupling of excitons in monolayers of molybdenum disulphide to their mirror image in an underlying gold substrate. Excitons at the direct band gap are little affected by the substrate whereas strongly bound C-excitons associated with a van-Hove singularity change drastically. On quartz substrates only one C-exciton is visible (in the blue) but on gold substrates a strong red-shifted extra resonance in the green is seen. Exciton coupling to its image leads to formation of a mirror biexciton with enhanced binding energy. Estimates of this energy shift in an emitter-gold system match experiments well. The absorption spectrum of MoS{sub 2} on gold thus resembles a bilayer of MoS{sub 2} which has been created by optical coupling. Additional top-mirrors produce an optical bulk..

Mertens, Jan; Baumberg, Jeremy J., E-mail: jjb12@cam.ac.uk [Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE (United Kingdom); Shi, Yumeng; Yang, Hui Ying, E-mail: yanghuiying@sutd.edu.sg [Pillar of Engineering Product Development, Singapore University of Technology and Design, Singapore 138682 (Singapore); Molina-Snchez, Alejandro; Wirtz, Ludger [Physics and Materials Science Research Unit, University of Luxembourg, L-1511 Luxembourg (Luxembourg)

2014-05-12T23:59:59.000Z

394

Photo-Thermal Transfer Function of Dielectric Mirrors for Precision Measurements  

E-Print Network [OSTI]

The photo-thermal transfer function from absorbed power incident on a dielectric mirror to the effective mirror position is calculated using the coating design as input. The effect is found to change in amplitude and sign for frequencies corresponding to diffusion length comparable to the coating thickness. Transfer functions are calculated for the $Ti$-doped ${\\rm Ta_2O_5:SiO_2}$ coating used in Advanced LIGO and for a crystalline ${\\rm Al_xGa_{1-x}As}$ coating. The shape of the transfer function at high frequencies is shown to be a sensitive indicator of the effective absorption depth, providing a potentially powerful tool to distinguish coating-internal absorption from surface contamination related absorption. The sign change of the photo-thermal effect could also be useful to stabilize radiation pressure-based opto-mechanical systems. High frequency corrections to the previously published thermo-optic noise estimates are also provided. Finally, estimating the quality of the thermo-optic noise cancellation occurring in fine-tuned ${\\rm Al_xGa_{1-x}As}$ coatings requires the detailed heat flow analysis done in this paper.

Stefan W. Ballmer

2014-11-10T23:59:59.000Z

395

Photo-Thermal Transfer Function of Dielectric Mirrors for Precision Measurements  

E-Print Network [OSTI]

The photo-thermal transfer function from absorbed power incident on a dielectric mirror to the effective mirror position is calculated using the coating design as input. The effect is found to change in amplitude and sign for frequencies corresponding to diffusion length comparable to the coating thickness. Transfer functions are calculated for the $Ti$-doped ${\\rm Ta_2O_5:SiO_2}$ coating used in Advanced LIGO and for a crystalline ${\\rm Al_xGa_{1-x}As}$ coating. The shape of the transfer function at high frequencies is shown to be a sensitive indicator of the effective absorption depth, providing a potentially powerful tool to distinguish coating-internal absorption from surface contamination related absorption. The sign change of the photo-thermal effect could also be useful to stabilize radiation pressure-based opto-mechanical systems. High frequency corrections to the previously published thermo-optic noise estimates are also provided. Finally, estimating the quality of the thermo-optic noise cancellation occurring in fine-tuned ${\\rm Al_xGa_{1-x}As}$ coatings requires the detailed heat flow analysis done in this paper.

Stefan W. Ballmer

2015-01-07T23:59:59.000Z

396

Summary of mirror experiments relevant to beam-plasma neutron source  

SciTech Connect (OSTI)

A promising design for a deuterium-tritium (DT) neutron source is based on the injection of neutral beams into a dense, warm plasma column. Its purpose is to test materials for possible use in fusion reactors. A series of designs have evolved, from a 4-T version to an 8-T version. Intense fluxes of 5--10 MW/m/sup 2/ is achieved at the plasma surface, sufficient to complete end-of-life tests in one to two years. In this report, we review data from earlier mirror experiments that are relevant to such neutron sources. Most of these data are from 2XIIB, which was the only facility to ever inject 5 MW of neutral beams into a single mirror call. The major physics issues for a beam-plasma neutron source are magnetohydrodynamic (MHD) equilibrium and stability, microstability, startup, cold-ion fueling of the midplane to allow two-component reactions, and operation in the Spitzer conduction regime, where the power is removed to the ends by an axial gradient in the electron temperature T/sub e/. We show in this report that the conditions required for a neutron source have now been demonstrated in experiments. 20 refs., 15 figs., 3 tabs.

Molvik, A.W.

1988-10-18T23:59:59.000Z

397

Development of mirrors made of chemically tempered glass foils for future X-ray telescopes  

E-Print Network [OSTI]

Thin slumped glass foils are considered good candidates for the realization of future X-ray telescopes with large effective area and high spatial resolution. However, the hot slumping process affects the glass strength, and this can be an issue during the launch of the satellite because of the high kinematical and static loads occurring during that phase. In the present work we have investigated the possible use of Gorilla glass (produced by Corning), a chemical tempered glass that, thanks to its strength characteristics, would be ideal. The un-tempered glass foils were curved by means of an innovative hot slumping technique and subsequently chemically tempered. In this paper we show that the chemical tempering process applied to Gorilla glass foils does not affect the surface micro-roughness of the mirrors. On the other end, the stress introduced by the tempering process causes a reduction in the amplitude of the longitudinal profile errors with a lateral size close to the mirror length. The effect of the ov...

Salmaso, B; Brizzolari, B; Basso, S; Ghigo, M; Pareschi, G; Spiga, D; Proserpio, L; Suppiger, Y

2015-01-01T23:59:59.000Z

398

Magnetic Fields Analogous to electric field, a magnet  

E-Print Network [OSTI]

characteristic of elementary particles such as an electron #12;Magnetic Fields Magnetic field lines Direction;Magnetic Fields Magnetic field lines enter one end (south) of magnet and exit the other end (north) Opposite magnetic poles attract like magnetic poles repel #12;Like the electric field lines

Bertulani, Carlos A. - Department of Physics and Astronomy, Texas A&M University

399

Optimized Si/SiO2 high contrast grating mirror design for mid-infrared wavelength range: robustness enhancement  

E-Print Network [OSTI]

A high reflectivity and polarization selective high contrast grating mirror has been designed with the use of an automated optimization algorithm. Through a precise study of the tolerance of the different lengths of the structure, the robustness with respect to the fabrication errors has been enhanced to high tolerance values between 5 % and 210 %. This adjustment of the dimensions of the structure leads to a 250 nm large bandwidth mirror well adapted for a VCSEL application at \\lambda = 2.65 $\\mu$m and can easily be scaled for other wavelengths.

Chevallier, Christyves; Jacquet, Joel; Fressengeas, Nicolas; 10.1016/j.optlastec.2011.09.010

2011-01-01T23:59:59.000Z

400

HTS Magnet Program | Superconducting Magnet Division  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

HTS Magnet Program HTS Magnet Program High Temperature Superconductors (HTS) have the potential to revolutionize the field of superconducting magnets for particle accelerators, energy storage and medical applications. This is because of the fact that as compared to the conventional Low Temperature Superconductors (LTS), the critical current density (Jc ) of HTS falls slowly both: as a function of increasing field, and as a function of increasing temperature These unique properties can be utilized to design and build: HTS magnets that produce very high fields (20 - 50 T) HTS magnets that operate at elevated temperatures (20 - 77 K) This is a significant step forward over the convention LTS magnets which generally operate at a temperature of ~4 K and with field usually limited

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Nanocomposite Magnets: Transformational Nanostructured Permanent Magnets  

SciTech Connect (OSTI)

Broad Funding Opportunity Announcement Project: GE is using nanomaterials technology to develop advanced magnets that contain fewer rare earth materials than their predecessors. Nanomaterials technology involves manipulating matter at the atomic or molecular scale, which can represent a stumbling block for magnets because it is difficult to create a finely grained magnet at that scale. GE is developing bulk magnets with finely tuned structures using iron-based mixtures that contain 80% less rare earth materials than traditional magnets, which will reduce their overall cost. These magnets will enable further commercialization of HEVs, EVs, and wind turbine generators while enhancing U.S. competitiveness in industries that heavily utilize these alternatives to rare earth minerals.

None

2010-10-01T23:59:59.000Z

402

Abstract--Grazing incidence metal mirrors in laser-driven IFE power plants are subject to a variety of threats that result  

E-Print Network [OSTI]

of threats that result in damages leading to increased laser absorption, beam quality degradation and reduced of threats, including prompt neutron and gamma fluxes, x-ray and ionic emissions, and contamination from in the ARIES study. II. MIRROR DEFECTS AND ANALYSIS APPROACHES Depending on the type of threat, the mirror can

Tillack, Mark

403

E-E L T Primary Mirror Control System M. Dimmler, T. Erm, B. Bauvir, B. Sedghi, H. Bonnet, M. Mller and A. Wallander  

E-Print Network [OSTI]

! ! ! E-E L T Primary Mirror Control System M. Dimmler, T. Erm, B. Bauvir, B. Sedghi, H. Bonnet, M. Müller and A. Wallander European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei München, Germany ABSTRA C T During the past year the control of the 42m segmented primary mirror of the E

Liske, Jochen

404

EUV Interferometry of a Four-Mirror Ring-Field EUV Optical System Kenneth A. Goldberg*a, Patrick Naulleaua, Phillip J. Batsona, Paul Denhama,  

E-Print Network [OSTI]

EUV Interferometry of a Four-Mirror Ring-Field EUV Optical System Kenneth A. Goldberg*a, Patrick At-wavelength, extreme ultraviolet interferometric measurements of a new, four-mirror, ring of several small-field EUV 10? Schwarzschild objec- tives.5 A new branchline of the undulator source

Bokor, Jeffrey

405

Parallel heat flux and flow acceleration in open field line plasmas with magnetic trapping  

SciTech Connect (OSTI)

The magnetic field strength modulation in a tokamak scrape-off layer (SOL) provides both flux expansion next to the divertor plates and magnetic trapping in a large portion of the SOL. Previously, we have focused on a flux expander with long mean-free-path, motivated by the high temperature and low density edge anticipated for an absorbing boundary enabled by liquid lithium surfaces. Here, the effects of magnetic trapping and a marginal collisionality on parallel heat flux and parallel flow acceleration are examined. The various transport mechanisms are captured by kinetic simulations in a simple but representative mirror-expander geometry. The observed parallel flow acceleration is interpreted and elucidated with a modified Chew-Goldberger-Low model that retains temperature anisotropy and finite collisionality.

Guo, Zehua; Tang, Xian-Zhu; McDevitt, Chris [Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

2014-10-15T23:59:59.000Z

406

Tamper resistant magnetic stripes  

DOE Patents [OSTI]

This invention relates to a magnetic stripe comprising a medium in which magnetized particles are suspended and in which the encoded information is recorded by actual physical rotation or alignment of the previously magnetized particles within the flux reversals of the stripe which are 180.degree. opposed in their magnetic polarity. The magnetized particles are suspended in a medium which is solid, or physically rigid, at ambient temperatures but which at moderately elevated temperatures, such as 40.degree. C., is thinable to a viscosity permissive of rotation of the particles therein under applications of moderate external magnetic field strengths within acceptable time limits.

Naylor, Richard Brian (Albuquerque, NM); Sharp, Donald J. (Albuquerque, NM)

1999-01-01T23:59:59.000Z

407

National High Magnetic Field Laboratory: An Introduction to Magnets...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

resistive magnet is here at the Magnet Lab: It can generate a sustained magnetic field of 35 tesla. (Were not counting here our world-record hybrid magnet or the stronger,...

408

3D analysis of magnetization distribution magnetized by capacitor-discharge impulse magnetizer  

Science Journals Connector (OSTI)

Method for calculating the magnetization distribution magnetized by capacitor-discharge impulse magnetizer is expanded to 3D, and the calculated flux distribution is compared with measured one.

Norio Takahashi

2001-01-01T23:59:59.000Z

409

Spin and orbital magnetization loops obtained using magnetic Compton scattering  

SciTech Connect (OSTI)

We present an application of magnetic Compton scattering (MCS) to decompose a total magnetization loop into spin and orbital magnetization contributions. A spin magnetization loop of SmAl{sub 2} was measured by recording the intensity of magnetic Compton scattering as a function of applied magnetic field. Comparing the spin magnetization loop with the total magnetization one measured by a vibrating sample magnetometer, the orbital magnetization loop was obtained. The data display an anti-coupled behavior between the spin and orbital magnetizations and confirm that the orbital part dominates the magnetization.

Itou, M.; Sakurai, Y. [Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198 (Japan)] [Japan Synchrotron Radiation Research Institute, SPring-8, Hyogo 679-5198 (Japan); Koizumi, A. [Graduate School of Materials Science, University of Hyogo, Hyogo 678-1297 (Japan)] [Graduate School of Materials Science, University of Hyogo, Hyogo 678-1297 (Japan)

2013-02-25T23:59:59.000Z

410

Long-Working-Distance Kirkpatrick-Baez Mirrors for Hard X-ray Beamlines at SPring-8  

SciTech Connect (OSTI)

We designed and installed two types of long-working-distance Kirkpatrick-Baez (KB) mirrors and mirror manipulators, which were customized into each experiment for hard x-ray undulator beamlines at SPring-8. For the BL32XU RIKEN Targeted Proteins beamline, 400-mm-long KB focusing mirrors for a beam size of 1 {mu}m with a 730-mm-long working distance were designed for carrying out the structural analysis of protein microcrystals. We realized a focusing beam size of 0.9x0.9 {mu}m{sup 2}(FWHM) and a focusing intensity of 6x10{sup 10} (photons/s) at an x-ray energy of 12.4 keV. For the BL19LXU RIKEN SR Physics beamline, we developed KB mirrors for 100-nm focusing with a 100-mm-working distance for the purpose of nano-focus x-ray diffraction. A focusing beam size of 100x100 nm{sup 2}(FWHM) and a high focusing intensity of 3.7x10{sup 10} (photons/s) at an x-ray energy of 12.4 keV were realized.

Yumoto, H.; Koyama, T. [Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); Hirata, K.; Kawano, Y.; Ueno, G.; Nisawa, A.; Hikima, T.; Takeshita, S.; Ito, K.; Tanaka, Y.; Arima, T.; Yamamoto, M. [RIKEN/SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan); Ohsumi, H.; Ohashi, H.; Goto, S. [Japan Synchrotron Radiation Research Institute (JASRI)/SPring-8, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198 (Japan); RIKEN/SPring-8, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148 (Japan)

2011-09-09T23:59:59.000Z

411

Mirrors for X-ray telescopes: Fresnel diffraction-based computation of Point Spread Functions from metrology  

E-Print Network [OSTI]

The imaging sharpness of an X-ray telescope is chiefly determined by the optical quality of its focusing optics, which in turn mostly depends on the shape accuracy and the surface finishing of the grazing incidence X-ray mirrors that compose the optical modules. In order to ensure the imaging performance during the mirror manufacturing, a fundamental step is represented by the prediction of the mirror Point Spread Function (PSF) from the metrology of its surface. Traditionally, the PSF computation in X-rays is assumed to be different depending on whether the surface defects are classified as figure errors or roughness [...] The aim of this work is to overcome this limit, providing analytical formulae, valid at any light wavelength, to compute the PSF of an X-ray mirror shell from the measured longitudinal profiles and the roughness Power Spectral Density (PSD), without distinguishing spectral ranges with different treatments. The method we adopted is based on the Huygens-Fresnel principle to compute the diffr...

Raimondi, Lorenzo

2014-01-01T23:59:59.000Z

412

Diurnal modulation due to self-interacting mirror and hidden sector dark matter  

SciTech Connect (OSTI)

Mirror and more generic hidden sector dark matter models can simultaneously explain the DAMA, CoGeNT and CRESST-II dark matter signals consistently with the null results of the other experiments. This type of dark matter can be captured by the Earth and shield detectors because it is self-interacting. This effect will lead to a diurnal modulation in dark matter detectors. We estimate the size of this effect for dark matter detectors in various locations. For a detector located in the northern hemisphere, this effect is expected to peak in April and can be detected for optimistic parameter choices. The diurnal variation is expected to be much larger for detectors located in the southern hemisphere. In particular, if the CoGeNT detector were moved to e.g. Sierra Grande, Argentina then a 5? dark matter discovery would be possible in around 30 days of operation.

Foot, R., E-mail: rfoot@unimelb.edu.au [ARC Centre of Excellence for Particle Physics at the Terascale, School of Physics, University of Melbourne, Melbourne, Victoria 3010 (Australia)

2012-04-01T23:59:59.000Z

413

Preparation of dielectrics HR mirrors from colloidal oxide suspensions containing organic polymer binders  

SciTech Connect (OSTI)

Colloidal suspensions of oxides have been used to prepare dielectric HR (high reflective) mirrors, specifically for high power fusion case applications, on substrates up to 38 cm square using a meniscus coater. These coatings consist of porous quarterwave layers of alternating high and low refractive index oxides. Silica was used as the low index oxide and AlOOH, ZrO{sub 2}, or HfO{sub 2} as the high index material. Coatings were weak because of low particle-to-particle adhesion. Use of organic polymer binders in the high index component was found to increase strength, thereby improving the laser damage threshold and also reducing the number of layers required for 99% reflection due to increased refractive index.

Thomas, I.M.

1994-07-19T23:59:59.000Z

414

Electronic film with embedded micro-mirrors for solar energy concentrator systems  

E-Print Network [OSTI]

A novel electronic film solar energy concentrator with embedded micro-mirrors that track the sun is described. The potential viability of this new concept is presented. Due to miniaturization, the amount of material needed for the optical system is minimal. Because it is light-weight and flexible, it can easily be attached to the land or existing structures. This presents an economic advantage over conventional concentrators which require the construction of a separate structure to support them, and motors to orient them to intercept and properly reflect sunlight. Such separate structures must be able to survive gusts, windstorms, earthquakes, etc. This concentrator utilizes the ground or existing edifices which are already capable of withstanding such vicissitudes of nature.

Mario Rabinowitz; Mark Davidson

2004-04-16T23:59:59.000Z

415

Electronic film with embedded micro-mirrors for solar energy concentrator systems  

E-Print Network [OSTI]

A novel electronic film solar energy concentrator with embedded micro-mirrors that track the sun is described. The potential viability of this new concept is presented. Due to miniaturization, the amount of material needed for the optical system is minimal. Because it is light-weight and flexible, it can easily be attached to the land or existing structures. This presents an economic advantage over conventional concentrators which require the construction of a separate structure to support them, and motors to orient them to intercept and properly reflect sunlight. Such separate structures must be able to survive gusts, windstorms, earthquakes, etc. This concentrator utilizes the ground or existing edifices which are already capable of withstanding such vicissitudes of nature.

Rabinowitz, M; Rabinowitz, Mario; Davidson, Mark

2004-01-01T23:59:59.000Z

416

Finite-orbit method for dynamic analysis of mirror fusion systems  

SciTech Connect (OSTI)

A model (FOREMD) is described which treats plasma buildup in small mirror fusion devices where finite gyroradius effects are important to the dynamic evolution of the density and energy profiles. An energy-dependent group technique is employed, but unlike conventional point-kinetic diffusion models, the local density is calculated by a summing over orbits passing through the volume of interest. This treatment is particularly important during buildup via neutral beam injection where charge-exchange losses near the surface affect the inner-volume density distribution through loss of large orbit ions. As an example of the use of FOREMD, buildup processes in two experimental devices (2X-IIB and TMX) are examined.

Campbell, M.M.; Miley, G.H.

1981-01-01T23:59:59.000Z

417

Radial transport in the central cell of the tandem mirror experiment  

Science Journals Connector (OSTI)

An experimental study of radial transport in the Tandem Mirror Experiment is reported here. Plasma parameters were measured in a series of well?diagnosed plasma discharges. A negative electric current (8040 A within a 30?cm radius) flowed to the end wall implying an equal radial loss of plasma ions. The axial losses of plasma ions were 100 A from the same volume. The nonambipolar radial ion flux was of the same order as the flux resulting from resonant?neoclassical and ion?neutral transport but the uncertainties are large. The ambipolar radial transport (of both ions and electrons) was investigated by comparing the observed end losses with calculations of the plasma fueling by gas penetration and neutral beams. The ambipolar radial losses are probably smaller than the loses through other processes and may be as small as the classical losses resulting from Coulomb collisions.

R. P. Drake; E. B. Hooper Jr.; C. V. Karmendy; S. L. Allen; T. A. Casper; J. F. Clauser; F. H. Coensgen; R. H. Cohen; D. L. Correll; J. C. Davis; J. H. Foote; A. H. Futch; R. K. Goodman; D. P. Grubb; G. E. Gryczkowski; G. A. Hallock; A. L. Hunt; W. E. Nexsen; W. L. Pickles; A. E. Pontau; P. Poulsen; T. C. Simonen; O. T. Strand; W. R. Wampler

1982-01-01T23:59:59.000Z

418

Energy confinement studies in the tandem mirror experiment (TMX): Power flow  

Science Journals Connector (OSTI)

Using the measured plasma densities and energies the flow of power between the different particle species and regions of the tandem mirror experiment (TMX) is analyzed. The power flow is described by a simple classical model modified to include: (1) a halo of cool plasma that reduces end?cell ion losses due to charge exchange on background gas (2) instability heating of the central?cell ions both in the central cell and as they escape through the plugs (3) electron energy transport along the field lines which is less than predicted and (4) radial transport of the central?cell ions. Our global power balance including all particles and regions accounts for 8727% of the trapped neutral?beam power.

D. P. Grubb; S. L. Allen; T. A. Casper; J. F. Clauser; F. H. Coensgen; R. H. Cohen; D. L. Correll; W. C. Cummins; J. C. Davis; R. P. Drake; J. H. Foote; A. H. Futch; R. K. Goodman; G. E. Gryczkowski; E. B. Hooper Jr.; R. S. Hornady; A. L. Hunt; C. V. Karmendy; W. E. Nexsen; W. L. Pickles; G. D. Porter; P. Poulsen; T. D. Rognlien; T. C. Simonen; D. R. Slaughter; P. Coakley; G. A. Hallock; O. T. Strand

1983-01-01T23:59:59.000Z

419

Compact tunable Compton x-ray source from laser-plasma accelerator and plasma mirror  

E-Print Network [OSTI]

We present results of the first tunable Compton backscattering (CBS) x-ray source that is based on the easily aligned combination of a laser-plasma accelerator (LPA) and a plasma mirror (PM). The LPA is driven in the blowout regime by 30 TW, 30 fs laser pulses, and produces high-quality, tunable, quasi-monoenergetic electron beams. A thin plastic film near the gas jet exit efficiently retro-reflects the LPA driving pulse with relativistic intensity into oncoming electrons to produce $2\\times10^{7}$ CBS x-ray photons per shot with 10-20 mrad angular divergence and 50 % (FWHM) energy spread without detectable bremsstrahlung background. The x-ray central energy is tuned from 75 KeV to 200 KeV by tuning the LPA e-beam central energy. Particle-in-cell simulations of the LPA, the drive pulse/PM interaction and CBS agree well with measurements.

Tsai, Hai-En; Shaw, Joseph; Li, Zhengyan; Arefiev, Alexey V; Zhang, Xi; Zgadzaj, Rafal; Henderson, Watson; Khudik, V; Shvets, G; Downer, M C

2014-01-01T23:59:59.000Z

420

Time interval and lattice vibration in Raman effect, photoelectric effect and plane mirror reflection  

E-Print Network [OSTI]

Time interval between the incident and scattered photon in Raman effect and absorption of photon and emission of electron in photoelectric effect has not been determined till now. This is because there is no such high level instrument discovered till now to detect time interval to such a small level. But this can be calculated theoretically by applying a basic principle of physics like impulse is equal to the change in momentum. Considering the collision between electron and photon as perfect inelastic collision in photoelectric effect, elastic and inelastic collision in Raman effect and elastic collision in plane mirror reflection and the interaction between electron and photon as strong gravitational interaction we calculate the required time interval. During these phenomena there is lattice vibration which can be quantized as phonon particles.

M. Kumar; S. Sahoo

2012-07-02T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Recent lunar magnetism  

E-Print Network [OSTI]

The magnetization of young lunar samples (magnetic fields (e.g. core dynamo and long-lived impact plasma fields) have not been present within the last 1.5 Ga. To better ...

Buz, Jennifer

2011-01-01T23:59:59.000Z

422

Metallic Magnetic Hetrostructures  

E-Print Network [OSTI]

This work studied sputter deposited conventional spin valves (SV) and related structures. In SV layered structures, two ferromagnetic layers are separated by a non-magnetic spacer. Under an external magnetic field, the relative orientation...

Leung, Chi Wah

423

Plasma Magnetic Insulation  

Science Journals Connector (OSTI)

29 June 1987 research-article Plasma Magnetic Insulation B. B. Kadomtsev Theoretically the strong magnetic field of a tokamak should confine electrons and ions in a high-temperature...

1987-01-01T23:59:59.000Z

424

Magnetic assisted statistical assembly  

E-Print Network [OSTI]

The objective of this thesis is to develop a process using magnetic forces to assemble micro-components into recesses on silicon based integrated circuits. Patterned SmCo magnetic thin films at the bottom of recesses are ...

Cheng, Diana I

2008-01-01T23:59:59.000Z

425

Magnetic Nanoparticle NANOMATERIALS  

E-Print Network [OSTI]

Magnetic Nanoparticle Metrology NANOMATERIALS We are developing best practice metrology for characterization of magnetic nanoparticle systems (e.g. blocking temperature, anisotropy, property distributions, T nanoparticles and provide guidelines to the FDA to properly compare systems when approving nanoparticle systems

426

Uranium Monochalcogenides: Magnetic Form Factor and Magnetic Neutron Scattering  

Science Journals Connector (OSTI)

Fig. R.66. UY. (A) Magnetic form factor. The radial ?j i? integrals, which contribute to the neutron magnetic fo...

R. Tro?

2009-01-01T23:59:59.000Z

427

LHC Magnet Program | Superconducting Magnet Division  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magnet Program Magnet Program The Superconducting Magnet Division is building a number of dipole magnets for the Large Hadron Collider (LHC), which is now under construction at CERN in Geneva, Switzerland. Scheduled to begin operation in 2007, this machine will collide beams of protons with the unprecedented energy of 7 TeV per beam to explore the nature of matter at its most basic level (RHIC can collide beams of protons with energies of 0.25 TeV, but is mostly used to collide heavy ions with energies of 0.1 TeV per nucleon). The magnets are being built as part of the US program, recommended by the High Energy Physics Advisory Panel (HEPAP) and approved by Congress, to contribute to the construction and, later, use of that frontier machine by the US high energy physics community. Fermi National Accelerator Laboratory (FNAL) and

428

Programmable matched filter and Hadamard transform hyperspectral imagers based on micro-mirror arrays  

SciTech Connect (OSTI)

Hyperspectral imaging (HSI), in which each pixel contains a high-resolution spectrum, is a powerful technique that can remotely detect, identify, and quantify a multitude of materials and chemicals. The advent of addressable micro-mirror arrays (MMAs) makes possible a new class of programmable hyperspectral imagers that can perform key spectral processing functions directly in the optical hardware, thus alleviating some of HSI's high computational overhead, as well as offering improved signal-to-noise in certain important regimes (e.g. when using uncooled infrared detectors). We have built and demonstrated a prototype UV-Visible micro-mirror hyperspectral imager that is capable not only of matched-filter imaging, but also of full hyperspectral imagery via the Hadamard transform technique. With this instrument, one can upload a chemical-specific spectral matched filter directly to the MMA, producing an image showing the location of that chemical without further processing. Target chemicals are changeable nearly instantaneously simply by uploading new matched-filter patterns to the MMA. Alternatively, the MMA can implement Hadamard mask functions, yielding a full-spectrum hyperspectral image upon inverting the transform. In either case, the instrument can produce the 2D spatial image either by an internal scan, using the MMA itself, or with a traditional external push-broom scan. The various modes of operation are selectable simply by varying the software driving the MMA. Here the design and performance of the prototype is discussed, along with experimental results confirming the signal-to-noise improvement produced by the Hadamard technique in the noisy-detector regime.

Love, Steven P [Los Alamos National Laboratory

2008-01-01T23:59:59.000Z

429

Magnetic susceptibility in QCD  

E-Print Network [OSTI]

Magnetic susceptibility in the deconfined phase of QCD is calculated in a closed form using a recent general expression for the quark gas pressure in magnetic field. Quark selfenergies are entering the result via Polyakov line factors and ensure the total paramagnetic effect, increasing with temperature. A generalized form of magnetic susceptibility in nonzero magnetic field suitable for experimental and lattice measurements is derived, showing a good agreement with available lattice data.

V. D. Orlovsky; Yu. A. Simonov

2014-05-12T23:59:59.000Z

430

Startup of a Neutral-Beam-Sustained Plasma in a Quasi-dc Magnetic Field  

Science Journals Connector (OSTI)

Warm plasma has been injected along field lines into a quasi-steady-state magnetic mirror in the 2XIIB experiment. This has provided a suitable target plasma for density buildup and heating with neutral-beam injection. With the injection of 310 A equivalent of 14-keV deuterium atoms, the density exponentiated to 3.7 1013 cm-3, the average ion energy increased to 12 keV, and the ? reached 0.4. A rate equation describing the density buildup is given.

F. H. Coensgen, W. F. Cummins, C. Gormezano, B. G. Logan, A. W. Molvik, W. E. Nexsen, T. C. Simonen, B. W. Stallard, and W. C. Turner

1976-07-19T23:59:59.000Z

431

Magnetism Theory Group / POSTECH Magnetism Theory Group / POSTECH  

E-Print Network [OSTI]

Magnetism Theory Group / POSTECH #12;Magnetism Theory Group / POSTECH #12;Magnetism Theory Group / POSTECH #12;Magnetism Theory Group / POSTECH #12;Magnetism Theory Group / POSTECH J.H . Park et al. #12;'s of FeinCsm e tal The chargeandorbitalordering geom etryin YB a C o 2 O 5 S. K. Kwon etal .Magnetism Theory

Min, Byung Il

432

RESEARCH: Argonne's Super Magnet  

Science Journals Connector (OSTI)

RESEARCH: Argonne's Super Magnet ... The world's largest superconducting magnet has been successfully built and operated by Argonne National Laboratory, at Argonne, Ill. ... The magnet will be part of Argonne's bubble chamber, also the world's largest, which should be completed on schedule this summer. ...

1969-02-03T23:59:59.000Z

433

Noble gas magnetic resonator  

DOE Patents [OSTI]

Precise measurements of a precessional rate of noble gas in a magnetic field is obtained by constraining the time averaged direction of the spins of a stimulating alkali gas to lie in a plane transverse to the magnetic field. In this way, the magnetic field of the alkali gas does not provide a net contribution to the precessional rate of the noble gas.

Walker, Thad Gilbert; Lancor, Brian Robert; Wyllie, Robert

2014-04-15T23:59:59.000Z

434

Magnetism in transition metals  

Science Journals Connector (OSTI)

By using the Hubbard tight-binding-type Hamiltonian and the cluster Bethe-lattice approximation we calculate for Fe the Curie temperature TC=2250 K and the temperature dependence of the magnetic moments and the magnetization. Moreover, we show how previous theories for itinerant magnets may be extended to include short-range spin correlations.

J. L. Morn-Lpez; K. H. Bennemann; M. Avignon

1981-06-01T23:59:59.000Z

435

A Study in Magnetism  

Science Journals Connector (OSTI)

... this century, for the simple comprehensiveness and original beauty of his researches in electricity and magnetism; chiefly, perhaps, for his discovery of magneto-electricitythe kind of electricity that ... space surrounding a magnet was thrown into a peculiar condition by the presence of the magnetism. Two centuries previously another Englishman, as uniquely great if not greater, Dr. Gilbert ...

SILVANUS P. THOMPSON

1878-11-28T23:59:59.000Z

436

Magnetically attached sputter targets  

DOE Patents [OSTI]

An improved method and assembly for attaching sputtering targets to cathode assemblies of sputtering systems which includes a magnetically permeable material is described. The magnetically permeable material is imbedded in a target base that is brazed, welded, or soldered to the sputter target, or is mechanically retained in the target material. Target attachment to the cathode is achieved by virtue of the permanent magnets and/or the pole pieces in the cathode assembly that create magnetic flux lines adjacent to the backing plate, which strongly attract the magnetically permeable material in the target assembly. 11 figures.

Makowiecki, D.M.; McKernan, M.A.

1994-02-15T23:59:59.000Z

437

In-situ magnetization of NdFeB magnets for permanent magnet machines  

SciTech Connect (OSTI)

In-situ magnetizers are needed to facilitate the assembly of permanent magnet machines and to remagnetize the magnets after weakening due to a fault condition. The air-core magnetizer in association with the silicon steel lamination structure of the rotor has advantages over its iron-core counterpart. This novel method has been used to magnetize the NdFeB magnets in a 30-hp permanent magnet synchronous motor. The magnetizing capability for different magnetizer geometries was investigated for the magnetization of NdFeB material. The design, testing, and operation of this magnetizer are reported in this paper.

Chang, L.; Eastham, T.R.; Dawson, G.E. (Dept. of Electrical Engineering, Queen's Univ., Kingston, Ontario K7L 3N6 (CA))

1991-09-01T23:59:59.000Z

438

Permanent magnet steam generator  

SciTech Connect (OSTI)

This patent describes a system for magnetic heating of a fluid by motor rotation of a permanent magnet rotor adjacent an assembly of ferro-magnetic condensing plate and of copper heat absorber plate with protrusions through the ferro-magnetic condensing plate into an enclosure with the fluid therein and having fluid inlet and fluid outlet. The assembly has a first shaft and a second shaft coaxially spaced therefrom, a respective the motor connected to the outer end of each shaft, and a respective the permanent magnet rotor connected to the inner end of each shaft, adjacent a the heat absorber plate. The improvement described here comprises: the enclosure including a steel boiler with a first the ferro-magnetic condensing plate closing off a first end thereof and a second the ferro-magnetic condensing plate closing off a second end thereof, a the copper heat absorbing plate affixed on each ferro-magnetic plate; means, free of pockets, for promoting turbulent flow of the fluid with uniformly good heat transfer including the protrusion being a plurality of heat sinks, each heat sink of the plurality of heat sinks comprising an integral elongate member with an alternately large diameter and smaller diameter portions regularly spaced therealong. The elongate members through the first the ferro-magnetic condensing plate are coaxially aligned with the elongate members through the second the ferro-magnetic condensing plate.

Gerard, F.; Gerard, F.J.

1986-09-30T23:59:59.000Z

439

High Field Magnet R&D |Superconducting Magnet Division  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

High Field Magnet R&D High Field Magnet R&D The Superconducting Magnet Division is developing advanced magnet designs and magnet-related technologies for high field accelerator magnets. We are currently working on magnets for three inter-related programs: High Field Magnets for Muon Collider Papers, Presentations Common Coil Magnets Papers, Presentations Interaction Region Magnets Papers, Presentations High Temperature Superconductor (HTS) Magnets Papers, Presentations This is part of a multi-lab superconducting magnet development program for new accelerator facilities that would be part of the U.S. High Energy Physics program. These programs (@BNL, @FNAL, @LBNL) are quite complimentary to each other, so that magnet designs and technologies developed at one laboratory can be easily transferred to another. The BNL

440

Magnetism reflectometer study shows LiF layers improve efficiency in spin valve devices  

SciTech Connect (OSTI)

New, more efficient materials for spin valves - a device used in magnetic sensors, random access memories, and hard disk drives - may be on the way based on research using the magnetism reflectometer at Oak Ridge National Laboratory (ORNL). Spin valve devices work by means of two or more conducting magnetic material layers that alternate their electrical resistance depending on the layers alignment. Giant magnetoresistance is a quantum mechanical effect first observed in thin film structures about 20 years ago. The effect is observed as a significant change in electrical resistance, depending on whether the magnetization of adjacent ferromagnetic layers is in a parallel or an antiparallel magnetic alignment. 'What we are doing here is developing new materials. The search for new materials suitable for injecting and transferring carriers with a preferential spin orientation is most important for the development of spintronics,' said Valeria Lauter, lead instrument scientist on the magnetism reflectometer at the Spallation Neutron Source (SNS), who collaborated on the experiment. The researchers discovered that the conductivity of such materials is improved when an organic polymer semiconductor layer is placed between the magnetic materials. Organic semiconductors are now the material of choice for future spin valve devices because they preserve spin coherence over longer times and distances than conventional semiconductors. While research into spin valves has been ongoing, research into organic semiconductors is recent. Previous research has shown that a 'conductivity mismatch' exists in spin valve systems in which ferromagnetic metal electrodes interface with such organic semiconductors as Alq3 ({pi}-conjugated molecule tris(8-hydroxy-quinoline) aluminium). This mismatch limits the efficient injection of the electrons from the electrodes at the interface with the semiconductor material. However, lithium fluoride (LiF), commonly used in light-emitting diodes, has been found to enhance the injection of electrons through the semiconductor. Researchers from the University of Alabama and ORNL used polarized neutrons at the magnetism reflectometer at SNS to investigate the electronic, magnetic, and structural properties of the electrodes in a novel system. In this system, the magnetic layers cobalt and Ni{sub 80}Fe{sub 20} are interfaced with spacer layers composed of the organic semiconductor Alq3. A coupling layer of LiF is inserted to separate the magnetized layers from the semiconductor. 'ALQ3 is an organic semiconductor material,' said Lauter. 'Normally in these systems a first magnetic layer is grown on a hard substrate so that one can get the controlled magnetic parameters. Then you grow the organic semiconductor layer, followed by another magnetic material layer, such as cobalt.' In addition to determining the effect of the LiF layers on the efficiency of the electron injection, the researchers wanted to determine the magnetic properties of the cobalt and Ni{sub 80}Fe{sub 20} as well as the interfacial properties: whether there is interdiffusion of cobalt through the LiF layer to the semiconductor, for example. The researchers used polarized neutrons at beam line 4A to probe the entire, layer-by-layer assembly of the system. 'Reflectometry with polarized neutrons is a perfect method to study thin magnetic films,' Lauter said. 'These thin films - if you put one on a substrate, you see it just like a mirror. However, this mirror has a very complicated internal multilayer structure. The neutrons look inside this complicated structure and characterize each and every interface. Due to the depth sensitivity of the method, we measure the structural and magnetic properties of each layer with the resolution of 0.5 nm. The neutron scattering results found that inserting LiF as a barrier significantly improves the quality of the interface, increasing the injection of electrons from the magnetic layer through the organic semiconductor in the spin valve and enhancing the overall properties of the system. In related work the magneti

Bardoel, Agatha A [ORNL; Lauter, Valeria [ORNL; Szulczewski, Greg J [ORNL

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Cool Magnetic Molecules  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cool Magnetic Molecules Cool Magnetic Molecules Cool Magnetic Molecules Print Wednesday, 25 May 2011 00:00 Certain materials are known to heat up or cool down when they are exposed to a changing magnetic field. This is known as the magnetocaloric effect. All magnetic materials exhibit this effect, but in most cases, it is too small to be technologically useful. Recently, however, the search for special molecules with a surprisingly large capacity to keep cool has heated up, driven by environmental and cost considerations as well as by recent improvements in our ability to design, assemble, and probe the structure and chemistry of small molecules. An international collaboration of researchers from Spain, Scotland, and the U.S. has utilized ALS Beamline 11.3.1 (small-molecule crystallography) to characterize the design of such "molecular coolers." The work targets the synthesis of molecular cluster compounds containing many unpaired electrons ("nanomagnets") for applications involving enhanced magnetic refrigeration at very low temperatures.

442

Passive magnetic bearing system  

DOE Patents [OSTI]

An axial stabilizer for the rotor of a magnetic bearing provides external control of stiffness through switching in external inductances. External control also allows the stabilizer to become a part of a passive/active magnetic bearing system that requires no external source of power and no position sensor. Stabilizers for displacements transverse to the axis of rotation are provided that require only a single cylindrical Halbach array in its operation, and thus are especially suited for use in high rotation speed applications, such as flywheel energy storage systems. The elimination of the need of an inner cylindrical array solves the difficult mechanical problem of supplying support against centrifugal forces for the magnets of that array. Compensation is provided for the temperature variation of the strength of the magnetic fields of the permanent magnets in the levitating magnet arrays.

Post, Richard F.

2014-09-02T23:59:59.000Z

443

CHAPTER 3. STRUCTURE OF MAGNETIC FIELDS 1 Structure of Magnetic  

E-Print Network [OSTI]

CHAPTER 3. STRUCTURE OF MAGNETIC FIELDS 1 Chapter 3 Structure of Magnetic Fields Many of the most interesting plasmas are permeated by or imbedded in magnetic fields.1 As shown in Fig. 3.1, the magnetic field properties of magnetic fields in plasmas can be discussed without specifying a model for the plasma

Callen, James D.

444

Normal-incidence Sb/B{sub 4}C multilayer mirrors for the 80 A < {lambda} < 120 A wavelength range  

SciTech Connect (OSTI)

Periodic and aperiodic Sb/B4C multilayer structures have been theoretically calculated and synthesised for the first time for the application in soft X-ray optics in the 80 A < {lambda} < 120 A range. The reflection spectra of the periodic multilayer mirrors are measured using synchrotron radiation and laser plasma-generated radiation. The experimental spectra are theoretically interpreted with the inclusion of transition layers and substrate roughness. The density of antimony layers is supposedly {rho}{sub (Sb)} = 6.0 g cm{sup -3}, and the thickness of transition layers (if any) in the Sb/B4C multilayer structures does not exceed 10 A. A peak reflectivity of 19 % is attained at a wavelength of 85 A. An aperiodic mirror optimised for maximum uniform reflectivity in the 100 - 120 A range is tested employing the laser plasma radiation source. (x-ray optics)

Vishnyakov, E A; Voronov, D L; Gullikson, E M; Kondratenko, V V; Kopylets, I A; Luginin, M S; Pirozhkov, A S; Ragozin, Evgenii N; Shatokhin, A N

2013-07-31T23:59:59.000Z

445

TMRBAR: a code to calculate plasma parameters for tandem-mirror reactors operating in the MARS mode  

SciTech Connect (OSTI)

The purpose of this report is to document the plasma power balance model currently used by LLNL to calculate steady state operating points for tandem mirror reactors. The code developed from this model, TMRBAR, has been used to predict the performance and define supplementary heating requirements for drivers used in the Mirror Advanced Reactor Study (MARS) and for the Fusion Power Demonstration (FPD) study. The equations solved included particle and energy balance for central cell and end cell species, quasineutrality at several cardinal points in the end cell region, as well as calculations of volumes, densities and average energies based on given constraints of beta profiles and fusion power output. Alpha particle ash is treated self-consistently, but no other impurity species is treated.

Campbell, R.B.

1983-08-30T23:59:59.000Z

446

Pulse magnetic welder  

DOE Patents [OSTI]

A welder is described for automated closure of fuel pins by a pulsed magnetic process in which the open end of a length of cladding is positioned within a complementary tube surrounded by a pulsed magnetic welder. Seals are provided at each end of the tube, which can be evacuated or can receive tag gas for direct introduction to the cladding interior. Loading of magnetic rings and end caps is accomplished automatically in conjunction with the welding steps carried out within the tube.

Christiansen, D.W.; Brown, W.F.

1984-01-01T23:59:59.000Z

447

Brownian motion and magnetism  

Science Journals Connector (OSTI)

We present an interesting connection between Brownian motion and magnetism. We use this to determine the distribution of areas enclosed by the path of a particle diffusing on a sphere. In addition, we find a bound on the free energy of an arbitrary system of spinless bosons in a magnetic field. The work presented here is expected to shed light on polymer entanglement, depolarized light scattering, and magnetic behavior of spinless bosons.

Supurna Sinha and Joseph Samuel

1994-11-01T23:59:59.000Z

448

The Virtues of Magnetism  

Science Journals Connector (OSTI)

The Virtues of Magnetism ... In Mozarts late opera Cos fan tutte from 1790, Despina, the accomplice of thread puller Don Alfonso, instantly heals the two male characters who are pretending to be dying by using the virtues of magnetism. ... Although magnetism had been known for centuries, its scientific sources were not yet understood at the end of the 18th century, when Lorenzo da Ponte wrote the libretto. ...

Jan-Ole Joswig; Tommy Lorenz; Gotthard Seifert

2013-12-23T23:59:59.000Z

449

Conceptual design study FY 1981: synfuels from fusion - using the tandem mirror reactor and a thermochemical cycle to produce hydrogen  

SciTech Connect (OSTI)

This report represents the second year's effort of a scoping and conceptual design study being conducted for the express purpose of evaluating the engineering potential of producing hydrogen by thermochemical cycles using a tandem mirror fusion driver. The hydrogen thus produced may then be used as a feedstock to produce fuels such as methane, methanol, or gasoline. The main objective of this second year's study has been to obtain some approximate cost figures for hydrogen production through a conceptual design study.

Krikorian, O.H. (ed.)

1982-02-09T23:59:59.000Z

450

Magnetic differential torque sensor  

SciTech Connect (OSTI)

A new torque sensor structure is presented. The basic idea is a simple torque sensor with a variable magnetic circuit excited by an axially magnetized permanent magnet ring. The circuit is constituted by iron toothed rings, whose teeth relative position changes whenever an applied torque twists the rotating shaft. A Hall probe measures the induction in an airgap where the induction is uniform. The new structure is an association of two previous ones, thus creating a differential system with the related advantages: diminution of thermal drifts, zero mean value for the signal. The new magnetic circuit is studied by calculating equivalent reluctances through energy calculations and by using electrical analogies.

Lemarquand, V.; Lemarquand, G. [Univ. de Savoie, Annecy-le-Vieux (France)] [Univ. de Savoie, Annecy-le-Vieux (France)

1995-11-01T23:59:59.000Z

451

Holographic Magnetic Phase Transition  

E-Print Network [OSTI]

We study four-dimensional interacting fermions in a strong magnetic field, using the holographic Sakai-Sugimoto model of intersecting D4 and D8 branes in the deconfined, chiral-symmetric parallel phase. We find that as the magnetic field is varied, while staying in the parallel phase, the fermions exhibit a first-order phase transition in which their magnetization jumps discontinuously. Properties of this transition are consistent with a picture in which some of the fermions jump to the lowest Landau level. Similarities to known magnetic phase transitions are discussed.

Gilad Lifschytz; Matthew Lippert

2009-06-21T23:59:59.000Z

452

Nuclear magnetic resonance imaging  

Science Journals Connector (OSTI)

Nuclear magnetic resonance imaging (NMRI) is a powerful imaging modality having a range of important applications to medicine and industry. The basic principles of NMRI are reviewed in...

Rothwell, William P

1985-01-01T23:59:59.000Z

453

Magnetic Field Viewing Cards  

Science Journals Connector (OSTI)

For some years now laminated cards containing a green magnetically sensitive film have been available from science education suppliers. When held near a magnet these cards appear dark green in regions where the field is perpendicular to the card and light green where the field is parallel to the card. The cards can be used to explore the magnetic field near a variety of magnets as well as near wire loops. In this paper we describe how to make these cards and how we have used them in our physics classrooms and labs.

Stephen Kanim; John R. Thompson

2005-01-01T23:59:59.000Z

454

Recycling Magnets | Jefferson Lab  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Recycling Magnets July 15, 2013 The cost of a nuclear or particle physics experiment can be enormous, several hundred million dollars for the Large Hadron Collider Experiments,...

455

Nuclear Magnetic Moments  

Science Journals Connector (OSTI)

This paper contains approximate formulas (Eqs. (5) and (6) for the calculation of nuclear magnetic moments from observed hyperfine structure separations.

S. Goudsmit

1933-04-15T23:59:59.000Z

456

Magnetism in hafnium dioxide  

Science Journals Connector (OSTI)

Thin films of HfO2 produced by pulsed-laser deposition on sapphire, yttria-stabilized zirconia, or silicon substrates show ferromagnetic magnetization curves with little hysteresis and extrapolated Curie temperatures far in excess of 400K. The moment does not scale with film thickness, but in terms of substrate area it is typically in the range 150400?Bnm?2. The magnetization exhibits a remarkable anisotropy, which depends on texture and substrate orientation. Pure HfO2 powder develops a weak magnetic moment on heating in vacuum, which is eliminated on annealing in oxygen. Lattice defects are the likely source of the magnetism.

J. M. D. Coey; M. Venkatesan; P. Stamenov; C. B. Fitzgerald; L. S. Dorneles

2005-07-22T23:59:59.000Z

457

Transverse Optical Magnetism  

Science Journals Connector (OSTI)

Magnetic interactions with light are usually so small that they are ignored, even in nonlinear optics. Scientists have discovered that parametric processes can drive the interactions...

Rand, Stephen

2010-01-01T23:59:59.000Z

458

Magnetism and Electricity  

Science Journals Connector (OSTI)

... of the mariner's compass being especially good; indeed, the whole chapter on terrestrial magnetism is the best elementary account of the subject which has come under our notice. ...

1889-11-14T23:59:59.000Z

459

Magnetic Braids Anthony Yeates  

E-Print Network [OSTI]

flux function Main result Conclusion 2. Thermonuclear confinement devices. ITER (Internat'l Thermonuclear Experimental Reactor). Inside the KSTAR tokamak. Correspond to periodic magnetic braids. 4 / 22

Dundee, University of

460

Stand alone computer system to aid the development of Mirror Fusion Test Facility rf heating systems  

SciTech Connect (OSTI)

The Mirror Fusion Test Facility (MFTF-B) control system architecture requires the Supervisory Control and Diagnostic System (SCDS) to communicate with a LSI-11 Local Control Computer (LCC) that in turn communicates via a fiber optic link to CAMAC based control hardware located near the machine. In many cases, the control hardware is very complex and requires a sizable development effort prior to being integrated into the overall MFTF-B system. One such effort was the development of the Electron Cyclotron Resonance Heating (ECRH) system. It became clear that a stand alone computer system was needed to simulate the functions of SCDS. This paper describes the hardware and software necessary to implement the SCDS Simulation Computer (SSC). It consists of a Digital Equipment Corporation (DEC) LSI-11 computer and a Winchester/Floppy disk operating under the DEC RT-11 operating system. All application software for MFTF-B is programmed in PASCAL, which allowed us to adapt procedures originally written for SCDS to the SSC. This nearly identical software interface means that software written during the equipment development will be useful to the SCDS programmers in the integration phase.

Thomas, R.A.

1983-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

SST-GATE: A dual mirror telescope for the Cherenkov Telescope Array  

E-Print Network [OSTI]

The Cherenkov Telescope Array (CTA) will be the world's first open observatory for very high energy gamma-rays. Around a hundred telescopes of different sizes will be used to detect the Cherenkov light that results from gamma-ray induced air showers in the atmosphere. Amongst them, a large number of Small Size Telescopes (SST), with a diameter of about 4 m, will assure an unprecedented coverage of the high energy end of the electromagnetic spectrum (above ~1TeV to beyond 100 TeV) and will open up a new window on the non-thermal sky. Several concepts for the SST design are currently being investigated with the aim of combining a large field of view (~9 degrees) with a good resolution of the shower images, as well as minimizing costs. These include a Davies-Cotton configuration with a Geiger-mode avalanche photodiode (GAPD) based camera, as pioneered by FACT, and a novel and as yet untested design based on the Schwarzschild-Couder configuration, which uses a secondary mirror to reduce the plate-scale and to all...

Zech, A; Blake, S; Boisson, C; Costille, C; De-Frondat, F; Dournaux, J -L; Dumas, D; Fasola, G; Greenshaw, T; Hervet, O; Huet, J -M; Laporte, P; Rulten, C; Savoie, D; Sayede, F; Schmoll, J

2013-01-01T23:59:59.000Z

462

Kinetic stabilization of interchange modes in an axisymmetric mirror by large orbit radius thermal ions  

SciTech Connect (OSTI)

A dispersion functional analysis that includes the full kinetic effects of large Larmor radius thermal ions is applied to the problem of stability of an axisymmetric mirror to finite azimuthal mode number ({ital m}) interchange modes. Vlasov theory is used to describe the ions, which are imbedded in a background of fluid electrons. The dispersion functional is solved numerically, both for a trial function displacement, where only the growth rate is determined, and the general case, where both the displacement and the growth rate are determined. In the trial function case, it is found that finite Larmor radius (FLR) effects are recovered, with a significant reduction in the growth rate when ({rho}{sub {ital i}}/{ital L}){sup 2}{approx gt}{gamma}{sub MHD}/{Omega}{sub {ital i}}. In a general case, the growth rate is reduced, but not so strongly as in the trial function case. It is shown heuristically that FLR effects may be recovered from the analysis and that these effects increase with the phase-space decorrelation time of the thermal ion distribution.

Krall, J.; Seyler, C.E.; Sudan, R.N. (Laboratory of Plasma Studies, Cornell University, Ithaca, New York 14853 (US))

1991-04-01T23:59:59.000Z

463

Kinetic stabilization of interchange modes in an axisymmetric mirror by large orbit radius thermal ions  

Science Journals Connector (OSTI)

A dispersion functional analysis that includes the full kinetic effects of large Larmor radius thermal ions is applied to the problem of stability of an axisymmetric mirror to finite azimuthal mode number (m) interchange modes. Vlasov theory is used to describe the ions which are imbedded in a background of fluid electrons. The dispersion functional is solved numerically both for a trial function displacement where only the growth rate is determined and the general case where both the displacement and the growth rate are determined. In the trial function case it is found that finite Larmor radius (FLR) effects are recovered with a significant reduction in the growth rate when (? i /L)2?? MHD /? i . In a general case the growth rate is reduced but not so strongly as in the trial function case. It is shown heuristically that FLR effects may be recovered from the analysis and that these effects increase with the phase?space decorrelation time of the thermal ion distribution.

J. Krall; C. E. Seyler; R. N. Sudan

1991-01-01T23:59:59.000Z

464

Experimental beta limit in an average minimum-B tandem mirror  

Science Journals Connector (OSTI)

High density (non-thermal-barrier) operation in the Tandem Mirror Experiment Upgrade (TMX-U) is found to be restricted by a stability limit. This limit is observed in the ratio of the neutral beam sustained central cell beta ?c to the hot ion beta ?ih in the minimum-B anchor cells at both ends of the central cell, qualitatively consistent with a flute interchange stability limit. The ratio is ?c/?ih = 5, over the range of 0.03 ? ?c ? 0.22, with no apparent reduction due to ballooning at high ?c. This is a factor of six below the standard magnetohydrodynamic (MHD) m = 1 stability theory prediction of ?c/?ih = 33 at ?c ? 0.1, where ballooning corrections to flute modes are small. The discrepancy could be due to approximations in the theory; however, experimental data indicate that the stability limit is due to drift wave turbulence or to large-m MHD flute or ballooning modes. The experimental beta limit is nearly independent of the hot electron beta in the anchor cells, which is compatible with theoretical predictions that the hot electron beta will decouple from MHD activity.

A.W. Molvik; T.A. Casper; A.H. Futch

1990-01-01T23:59:59.000Z

465

Study of impurities in the Tandem Mirror Experiment using extreme-ultraviolet spectroscopy  

SciTech Connect (OSTI)

Impurities in the Tandem Mirror Experiment (TMX) have been studied using extreme ultraviolet spectroscopy. Three time-resolving absolutely-calibrated normal-incidence monochromators, one on each section of TMX, were used to study the impurity emissions in the wavelength range of 300 A to 1600 A. The instruments on the east end cell and central cell were each capable of obtaining spatially-resolved profiles from 22 chords of the plasma simultaneously while the instrument on the west end cell monitored the central chord. The impurities identified in TMX were carbon, nitrogen, oxygen, and titanium. Emphasis was placed upon determining the impurity densities and radiated power losses of the central cell; results indicate that the impurity concentrations were low - less than 0.4% for each species - and that less than 10% of the total net trapped neutral beam power was lost to radiation. The use of titanium gettering on the central cell walls was observed to decrease the brightnesses of singly- and doubly-ionized carbon and oxygen in the central cell plasma. In the end cells, oxygen was the main impurity with a concentration of about 1.5% and was injected by the neutral beams; the other impurities had concentrations of about 0.5%. Radiation losses from the end cells were negligible.

Strand, O.T.

1982-05-12T23:59:59.000Z

466

Rational reductions of the 2D-Toda hierarchy and mirror symmetry  

E-Print Network [OSTI]

We introduce and study a two-parameter family of symmetry reductions of the two-dimensional Toda lattice hierarchy, which are characterized by a rational factorization of the Lax operator into a product of an upper diagonal and the inverse of a lower diagonal formal difference operator. They subsume and generalize several classical 1 + 1 integrable hierarchies, such as the bigraded Toda hierarchy, the Ablowitz-Ladik hierarchy and E. Frenkel's q-deformed Gelfand-Dickey hierarchy. We establish their characterization in terms of block Toeplitz matrices for the associated factorization problem, and study their Hamiltonian structure. At the dispersionless level, we show how the Takasaki-Takebe classical limit gives rise to a family of non-conformal Frobenius manifolds with flat identity. We use this to generalize the relation of the Ablowitz-Ladik hierarchy to Gromov-Witten theory by proving an analogous mirror theorem for rational reductions: in particular, we show that the dual-type Frobenius manifolds we obtain are isomorphic to the equivariant quantum cohomology of a family of toric Calabi-Yau threefolds obtained from minimal resolutions of the local orbifold line.

Andrea Brini; Guido Carlet; Stefano Romano; Paolo Rossi

2014-04-14T23:59:59.000Z

467

Magnetism Highlights| Neutron Science | ORNL  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Magnetism Magnetism SHARE Magnetism Highlights 1-5 of 5 Results ARCS maps collaborative magnetic spin behavior in iron telluride December 01, 2011 - Researchers have long thought that magnetism and superconductivity are mutually exclusive. The former typically involves localized atomic electrons. The latter requires freely propagating, itinerant electrons. Unexpected Magnetic Excitations in Doped Insulator Surprise Researchers October 01, 2011 - When doping a disordered magnetic insulator material with atoms of a nonmagnetic material, the conventional wisdom is that the magnetic interactions between the magnetic ions in the material will be weakened. Neutron Analysis Reveals Unique Atomic-Scale Behavior of "Cobalt Blue" September 01, 2011 - Neutron scattering studies of "cobalt blue," a

468

High?quality focused?ion?beam?made mirrors for InGaP/InGaAlP visible?laser diodes  

Science Journals Connector (OSTI)

We employed a focused ion beam(FIB) to sputter the end mirrors on InGaP/InGaAlP laser diodes. This particular diode operates at a wavelength of about 670 nm. For this wavelength the quality of the sputteredmirrors is far more critical than for longer wavelength devices. The present lasers do in fact show a relatively large increase in their threshold current after FIBmicromachining. In this article we investigate the origins of this increase and how to prevent it. After optimization the lasers with a FIB?made end mirror have a threshold current comparable to that of cleaved?facet devices. We have seen that the polycrystalline structure of the device metallization on top of the laser diode causes roughening of the mirror during sputtering which results in severe scatter losses of the laser light. A method to decrease the surface roughness is given. A further reason for the increase in threshold current is optical absorption at the mirror presumably by a Ga?rich layer. This can be circumvented by chemical etching after FIB treatment to remove the absorbing layer. Finally to demonstrate the quality and the applicability of the FIB?made mirrors the influence of the tilt angle of the end mirror on the threshold current of the laser has been investigated. This dependency can be excellently described by theory.

M. H. F. Overwijk; J. A. de Poorter

1993-01-01T23:59:59.000Z

469

BEPC-II Magnet Project | Superconducting Magnet Division  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

BEPC-II Magnet Project BEPC-II Magnet Project Project Overview The BEPC-II magnets are Interaction Region magnets to be used as part of an upgrade to the Beijing Electron Positron Collider. Two magnets will be produced, both of which will be inserted within the solenoidal detector at one of the collision points. Since the best use of the quadrupole focusing in this case requires placing the magnet as close to the collision point as possible, these magnets will be used within the magnetic field of the detector. This constrains the materials that can be used for construction to only non-magnetic materials. It also places severe demands on the structure of the magnet and it's holding supports due to the reaction forces between the solenoid and the magnet. To create the coil pattern for the final magnet, the coils will be

470

National High Magnetic Field Laboratory: An Introduction to Magnets...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

is a magnet); opposite poles attract, like poles repel. In all magnets, the magnetic field lines run from south to north, and these fields are what produce forces on other...

471

Journal of Magnetism and Magnetic Materials 252 (2002) 159161 Magnetically induced alignment of FNS  

E-Print Network [OSTI]

Journal of Magnetism and Magnetic Materials 252 (2002) 159­161 Magnetically induced alignment the observation of magnetically controlled anchoring of ferro-nematic suspensions. We found that application of a weak magnetic field to a cell with the ferro-suspension induces an easy orientation axis with weak

Reznikov, Yuri

472

Journal of Magnetism and Magnetic Materials 225 (2001) 337345 Irreversible magnetization in nickel nanoparticles  

E-Print Network [OSTI]

in this magnetic nanoparticle system. # 2001 Elsevier Science B.V. All rights reserved. PACS: 75.10.Nr; 75.50.KjJournal of Magnetism and Magnetic Materials 225 (2001) 337­345 Irreversible magnetization in nickel in revised form 20 October 2000 Abstract We report magnetic studies on nickel nanoparticle films of average

Zuo, Fulin

473

EXOTIC MAGNETS FOR ACCELERATORS.  

SciTech Connect (OSTI)

Over the last few years, several novel magnet designs have been introduced to meet the requirements of new, high performance accelerators and beam lines. For example, the FAIR project at GSI requires superconducting magnets ramped at high rates ({approx} 4 T/s) in order to achieve the design intensity. Magnets for the RIA and FAIR projects and for the next generation of LHC interaction regions will need to withstand high doses of radiation. Helical magnets are required to maintain and control the polarization of high energy protons at RHIC. In other cases, novel magnets have been designed in response to limited budgets and space. For example, it is planned to use combined function superconducting magnets for the 50 GeV proton transport line at J-PARC to satisfy both budget and performance requirements. Novel coil winding methods have been developed for short, large aperture magnets such as those used in the insertion region upgrade at BEPC. This paper will highlight the novel features of these exotic magnets.

WANDERER, P.

2005-09-18T23:59:59.000Z

474

Streched Magnetic Moments  

E-Print Network [OSTI]

We note that for a system of 2 nucleons in a stretched case (J=J1+J2) the magnetic moment of the combined system is the sum of the magnetic moments of the 2 constituents. We compile other simple formulas.

Larry Zamick; Yitzhak Sharon

2012-07-12T23:59:59.000Z

475

Magnetic insulation (reply)  

Science Journals Connector (OSTI)

... DR WINTERBERG REPLIES: Contrary to Blewett's belief, magnetic insulation has not only been experimentally confirmed2 since I proposed it several years ago1, but ... generators (for example, the MJ Aurora machine). The magnetic field needed for the insulation effect in this case is generated by the strong azimuthal self-induced field of the ...

F. WINTERBERG

1974-06-28T23:59:59.000Z

476

Magnetic reconnection in space  

SciTech Connect (OSTI)

Models of magnetic reconnection in space plasmas generally consider only a segment of the magnetic field lines. The consideration of only a segment of the lines is shown to lead to paradoxical results in which reconnection can be impossible even in a magnetic field constrained to be curl free or can be at an Alfven rate even when the plasma is a perfect conductor. A model of reconnecting magnetic fields is developed which shows the smallness of the interdiffusion distance {delta}{sub d} of magnetic field lines does not limit the speed of reconnection but does provide a reconnection trigger. When the reconnection region has a natural length L{sub r}, the spatial scale of the gradient of magnetic field across the magnetic field lines must reach L{sub g} Almost-Equal-To 0.3L{sub r}/ln(L{sub r}/{delta}{sub d}) for fast reconnection to be triggered, which implies a current density j Almost-Equal-To B/{mu}{sub 0}L{sub g} that is far lower than that usually thought required for fast reconnection. The relation between magnetic reconnection in space and in toroidal laboratory plasmas is also discussed.

Boozer, Allen H. [Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States)

2012-09-15T23:59:59.000Z

477

Itinerant-electron magnetism  

Science Journals Connector (OSTI)

... A conference on Itinerant-Electron Magnetism was held in Oxford on September 13?15, 1976. It was sponsored by the ... was held in Oxford on September 13?15, 1976. It was sponsored by the Magnetism Section of the European Physical Society and the Institute of Physics. The Proceedings will ...

E. P. Wohlfarth

1976-11-18T23:59:59.000Z

478

Treatise on Terrestrial Magnetism  

Science Journals Connector (OSTI)

... and from which the writer also attempts to deduce some of the other phenomena of magnetism. There seems to us to be some ambiguity in the writer's method of ... , to arrive at laws, that we may hope to form a theory of terrestrial magnetism, than from making an hypothesis,and then attempting to apply it to facts. ...

J. S.

1872-01-04T23:59:59.000Z

479

Remarks on Terrestrial Magnetism  

Science Journals Connector (OSTI)

... auror are secondary currents produced by rapid, though small, changes in the earth's magnetism. In this hypothesis the earth was viewed as similar to the soft iron core ... conductors in which secondary currents would be generated whenever any change took place in the magnetism of the core.

B. STEWART

1870-01-06T23:59:59.000Z

480

A Treatise on Magnetism  

Science Journals Connector (OSTI)

... principle expressed by Newton when he said Hypotheses non fingo. The elementary laws of magnetism are deduced by rigorous induction from particular cases and are then applied to explain phenomena ... the mathematics employed throughout are of a simple character, so that the first principles of magnetism are thus thrown open to one who has gone no great way in mathematical reading ...

JAMES STUART

1871-12-14T23:59:59.000Z

Note: This page contains sample records for the topic "yin-yang magnet mirrors" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Magnetism and Matter  

Science Journals Connector (OSTI)

... DR. STONER and all physicists interested in magnetism are to be congratulated on the appearance of this admirable monograph. In 1926, the ... admirable monograph. In 1926, the author published a book on the same subject, Magnetism and Atomic Structure. The present treatise, far from being merely a revised edition ...

H. A. K.

1935-07-20T23:59:59.000Z

482

Magnetism: Managed mess  

Science Journals Connector (OSTI)

... crime-fighting gadgetry (Fig. 1) noted long ago that he who controls magnetism controls the Universe. And efforts to control ... controls the Universe. And efforts to control magnetism continue to make progress, as Silevitch et al. ably demonstrate in this issue ( ...

Zachary Fisk

2007-08-01T23:59:59.000Z

483

Molecular and Cosmical Magnetism  

Science Journals Connector (OSTI)

... RECENT researches on magnetism tend to suggest that the negative electron may be a magneton or unitary electromagnet as ... previously considered and observed in relation to ferromagnetic bodies on the assumption that the ferro-magnetism is due to electrons in orbital motion as a whole. Wider conclusions can be ...

S. CHAPMAN

1920-11-25T23:59:59.000Z

484

Electricity and Magnetism  

Science Journals Connector (OSTI)

... and practical applications; or, speaking briefly, theory and practice. In the theoretical part, magnetism is first treated, then electricity, in the order statical electricity, electro-chemistry, and ... first treated, then electricity, in the order statical electricity, electro-chemistry, and electro-magnetism. In the practical part are comprised telegraphy and telephony, electric lighting and transmission of ...

A. GRAY

1891-11-05T23:59:59.000Z

485

Progress in Magnetism  

Science Journals Connector (OSTI)

... HISTORIES of physics and magnetism have much in common, beginning with the discovery of the lode-stone by the ... , beginning with the discovery of the lode-stone by the Greeks. Modern texts on magnetism tend to overlook the work of past philosophers and it is very refreshing to find ...

C. A. BATES

1965-11-13T23:59:59.000Z

486

Magnetism and Atomic Structure  

Science Journals Connector (OSTI)

... the information with regard to the atom has been obtained by studying spectra; chemistry, magnetism, X-ray scattering, etc., play only a subsidiary part. We must admit, ... for fresh sources of information. Much may be said in support of the opinion that magnetism will open a new way by which to approach the study of the structure of ...

P. KAPITZA

1927-06-04T23:59:59.000Z

487

Magnetism and Electricity  

Science Journals Connector (OSTI)

... WRITTEN in colloquial language, this book, which is a first-year course on magnetism and electricity, will appeal to many beginners besides the students in technical institutions, for ... have almost forgotten that their jargon is not that of the man in the street. Magnetism is first dealt with, and then the ideas of static and current electricity are ...

1922-11-11T23:59:59.000Z

488

The Origin of Magnetism  

Science Journals Connector (OSTI)

... A of the British Association at Hull this year a discussion on The Origin of Magnetism, it was met with the criticism from eminent quarters that the time was not ... to one another nor providing an answer to the essential question of the origin of magnetism. In spite of the comparative failure of the discussion in its wider aspects, one ...

A. O. RANKINE

1922-11-04T23:59:59.000Z

489

Gravitation and Magnetism  

Science Journals Connector (OSTI)

......1 August 1950 research-article Articles Gravitation and Magnetism E. A. Milne It is shown by the methods of kinematic relativity that there should be a connection between gravitation and magnetism of the type suggested by the empirical formulae of Blackett......

E. A. Milne

1950-08-01T23:59:59.000Z

490

National High Magnetic Field Laboratory Slideshow: Seeing Magnetic...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

more about magnets You can start here with a straightforward rundown. Compasses in Magnetic Fields Experiment with the compass in this tutorial to see how it responds to...

491

Superconducting Magnet Division  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

3 - 6/13/06 3 - 6/13/06 Superconducting Magnet Division S&T Committee Program Review June 22-23, 2006 Conference Room A, Bldg. 725, BNL DRAFT AGENDA Thursday, June 22 0830 Executive Session to address the charge S. Aronson (25 min) 0855 Welcome S. Aronson (5 min) 0900 Superconducting Magnet Division Status & M. Harrison (45 + 15 min) Issues - mission statement, core competencies, themes, program, problems, etc. 1000 Themes - Nb3Sn, HTS, Direct wind, Accelerator integration, P. Wanderer (20 + 10 min) rapid cycling Core Competencies 1030 Superconducting Materials A. Ghosh (20 + 5 min) 1055 Break 1110 Magnetic Design R. Gupta (20 + 5 min) 1135 Magnet Construction M. Anerella (20 + 5 min) 1200 Magnet Testing G. Ganetis (20 + 5 min)

492

Cool Magnetic Molecules  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cool Magnetic Molecules Print Cool Magnetic Molecules Print Certain materials are known to heat up or cool down when they are exposed to a changing magnetic field. This is known as the magnetocaloric effect. All magnetic materials exhibit this effect, but in most cases, it is too small to be technologically useful. Recently, however, the search for special molecules with a surprisingly large capacity to keep cool has heated up, driven by environmental and cost considerations as well as by recent improvements in our ability to design, assemble, and probe the structure and chemistry of small molecules. An international collaboration of researchers from Spain, Scotland, and the U.S. has utilized ALS Beamline 11.3.1 (small-molecule crystallography) to characterize the design of such "molecular coolers." The work targets the synthesis of molecular cluster compounds containing many unpaired electrons ("nanomagnets") for applications involving enhanced magnetic refrigeration at very low temperatures.

493

Cool Magnetic Molecules  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cool Magnetic Molecules Print Cool Magnetic Molecules Print Certain materials are known to heat up or cool down when they are exposed to a changing magnetic field. This is known as the magnetocaloric effect. All magnetic materials exhibit this effect, but in most cases, it is too small to be technologically useful. Recently, however, the search for special molecules with a surprisingly large capacity to keep cool has heated up, driven by environmental and cost considerations as well as by recent improvements in our ability to design, assemble, and probe the structure and chemistry of small molecules. An international collaboration of researchers from Spain, Scotland, and the U.S. has utilized ALS Beamline 11.3.1 (small-molecule crystallography) to characterize the design of such "molecular coolers." The work targets the synthesis of molecular cluster compounds containing many unpaired electrons ("nanomagnets") for applications involving enhanced magnetic refrigeration at very low temperatures.

494

Cool Magnetic Molecules  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cool Magnetic Molecules Print Cool Magnetic Molecules Print Certain materials are known to heat up or cool down when they are exposed to a changing magnetic field. This is known as the magnetocaloric effect. All magnetic materials exhibit this effect, but in most cases, it is too small to be technologically useful. Recently, however, the search for special molecules with a surprisingly large capacity to keep cool has heated up, driven by environmental and cost considerations as well as by recent improvements in our ability to design, assemble, and probe the structure and chemistry of small molecules. An international collaboration of researchers from Spain, Scotland, and the U.S. has utilized ALS Beamline 11.3.1 (small-molecule crystallography) to characterize the design of such "molecular coolers." The work targets the synthesis of molecular cluster compounds containing many unpaired electrons ("nanomagnets") for applications involving enhanced magnetic refrigeration at very low temperatures.

495

Cool Magnetic Molecules  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cool Magnetic Molecules Print Cool Magnetic Molecules Print Certain materials are known to heat up or cool down when they are exposed to a changing magnetic field. This is known as the magnetocaloric effect. All magnetic materials exhibit this effect, but in most cases, it is too small to be technologically useful. Recently, however, the search for special molecules with a surprisingly large capacity to keep cool has heated up, driven by environmental and cost considerations as well as by recent improvements in our ability to design, assemble, and probe the structure and chemistry of small molecules. An international collaboration of researchers from Spain, Scotland, and the U.S. has utilized ALS Beamline 11.3.1 (small-molecule crystallography) to characterize the design of such "molecular coolers." The work targets the synthesis of molecular cluster compounds containing many unpaired electrons ("nanomagnets") for applications involving enhanced magnetic refrigeration at very low temperatures.

496

Magnet pole tips  

DOE Patents [OSTI]

An improved magnet more easily provides a radially increasing magnetic field, as well as reduced fringe field and requires less power for a given field intensity. The subject invention comprises a pair of spaced, opposed magnetic poles which further comprise a pair of pole roots, each having a pole tip attached to its center. The pole tips define the gap between the magnetic poles and at least a portion of each pole tip is separated from its associated pole root. The separation begins at a predetermined distance from the center of the pole root and increases with increasing radial distance while being constant with azimuth within that portion. Magnets in accordance with the subject invention have been found to be particularly advantageous for use in large isochronous cyclotrons.

Thorn, C.E.; Chasman, C.; Baltz, A.J.

1981-11-19T23:59:59.000Z

497

Cryogenic permanent magnet undulators  

Science Journals Connector (OSTI)

In order to obtain high magnetic fields in a short period undulator, superconductive undulators have been actively investigated in recent years. In this paper, however, we propose a new approach, the cryogenic permanent magnet undulator (CPMU) design, using permanent magnets at the cryogenic temperature of liquid nitrogen or higher. This cryogenic scheme can be easily adapted to currently existing in-vacuum undulators and it improves the magnetic field performance by 30%50%. Unlike superconductive undulators operating around the liquid helium temperature, there is no big technological difficulty such as the thermal budget problem. In addition, existing field correction techniques are applicable to the CPMUs. Since there is no quench in the CPMUs, the operation of the CPMUs has the same reliability as conventional permanent magnet undulators.

Toru Hara; Takashi Tanaka; Hideo Kitamura; Teruhiko Bizen; Xavier Marchal; Takamitsu Seike; Tsutomu Kohda; Yutaka Matsuura

2004-05-18T23:59:59.000Z

498

Cool Magnetic Molecules  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Cool Magnetic Molecules Print Cool Magnetic Molecules Print Certain materials are known to heat up or cool down when they are exposed to a changing magnetic field. This is known as the magnetocaloric effect. All magnetic materials exhibit this effect, but in most cases, it is too small to be technologically useful. Recently, however, the search for special molecules with a surprisingly large capacity to keep cool has heated up, driven by environmental and cost considerations as well as by recent improvements in our ability to design, assemble, and probe the structure and chemistry of small molecules. An international collaboration of researchers from Spain, Scotland, and the U.S. has utilized ALS Beamline 11.3.1 (small-molecule crystallography) to characterize the design of such "molecular coolers." The work targets the synthesis of molecular cluster compounds containing many unpaired electrons ("nanomagnets") for applications involving enhanced magnetic refrigeration at very low temperatures.

499

Sources and Magnetic Charge  

Science Journals Connector (OSTI)

A beginning is made on a phenomenological reconstruction of the theory of magnetic charge. The concept is introduced by reference to a new kind of photon source. It is shown that photon exchange between different source types is relativistically invariant. The space-time generalization of this coupling involves an arbitrary vector. The only way to remove a corresponding arbitrariness of physical predictions is to recognize the localization of charge and impose a charge quantization condition. The consideration of particles that carry both kinds of charge loosens the charge restrictions. The great strength of magnetic attraction indicated by g24?=4(137) suggests that ordinary matter is a magnetically neutral composite of magnetically charged particles that carry fractional electric charge. There is a brief discussion of such a magnetic model of strongly interacting particles, which makes contact with empirical classification schemes. Additional remarks on notation, and on the general nature of the source description, are appended.

Julian Schwinger

1968-09-25T23:59:59.000Z

500

Phase-Boundary of a Cubic Superconducting Circuit in a Magnetic-Field of Arbitrary Magnitude and Direction  

E-Print Network [OSTI]

[a /g( T) ] is the eigenvalue; n?:sinu cosp, n~ =sina sinp, and n, ?:cosa are the directional cosines describing the direction of the applied magnetic field H relative to the axes of the cube, with a and p the polar angles of H, so that H=H(n e +n e... for P is 360', but the curves have 90 periodicity, and within each period, they have mirror symmetry about the midpoint, so only the range f3=0 ?45' needs to be presented. These symmetries are, of course, those of a cube. (The same cubic symmetry...

Hu, Chia-Ren; HUANG, CH.

1991-01-01T23:59:59.000Z