National Library of Energy BETA

Sample records for 5-cm period undulator

  1. Variable-Period Undulators For Synchrotron Radiation

    DOE Patents [OSTI]

    Shenoy, Gopal; Lewellen, John; Shu, Deming; Vinokurov, Nikolai

    2005-02-22

    A new and improved undulator design is provided that enables a variable period length for the production of synchrotron radiation from both medium-energy and high-energy storage rings. The variable period length is achieved using a staggered array of pole pieces made up of high permeability material, permanent magnet material, or an electromagnetic structure. The pole pieces are separated by a variable width space. The sum of the variable width space and the pole width would therefore define the period of the undulator. Features and advantages of the invention include broad photon energy tunability, constant power operation and constant brilliance operation.

  2. Concept of quasi-periodic undulator - control of radiation spectrum

    SciTech Connect (OSTI)

    Sasaki, Shigemi

    1995-02-01

    A new type of undulator, the quasi-periodic undulator (QPU) is considered which generates the irrational harmonics in the radiation spectrum. This undulator consists of the arrays of magnet blocks aligned in a quasi-periodic order, and consequentially lead to a quasi-periodic motion of electron. A combination of the QPU and a conventional crystal/grating monochromator provides pure monochromatic photon beam for synchrotron radiation users because the irrational harmonics do not be diffracted in the same direction by a monochromator. The radiation power and width of each radiation peak emitted from this undulator are expected to be comparable with those of the conventional periodic undulator.

  3. LCLS CDR Chapter 8 - Undulator

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

    8 Undulator TECHNICAL SYNOPSIS The LCLS Undulator is made up of 33 individual undulator segments. Each undulator segment will be a permanent-magnet planar hybrid device with a period length of 30 mm and a fixed gap of nominally 6 mm. The actual gap will be adjusted as necessary to yield an effective K of 3.71. Each undulator segment is 3.42 m long, with 226 poles per jaw. The poles will be made of vanadium permendur and the magnets of a grade of NdFeB with a high intrinsic coercivity for better

  4. Micropole undulator

    DOE Patents [OSTI]

    Csonka, P.L.; Tatchyn, R.O.

    1989-01-24

    Micropole undulators for use in the generation of x-rays from moving charged particles and methods for manufacturing such undulators are disclosed. One type of micropole undulator has two jaws containing rows of spaced apart poles arranged so that each pole produces a magnetic field aligned with all other similar fields. An external biasing field extends through the jaws so that an overall undulator field of substantially sinusoidal shape and substantially zero average value extends along the undulator axis. Preferably, the poles are bars formed of a magnetizable, but unmagnetized, material so that, after the jaws are assembled, all of the bars can be magnetized simultaneously in a uniform magnetic field of suitable strength. Another type of micropole undulator incorporates two parallel layers which have been magnetized to provide rows of alternating magnetic fields extending in opposite directions, the layers being positioned between the pole faces of a highly magnetically permeable material with the south poles of one layer opposite the north poles of the other. Poles in the layers are formed by subjecting successive regions of each layer to oppositely directed and suitably varied magnetizing forces. 16 figs.

  5. Micropole undulator

    DOE Patents [OSTI]

    Csonka, Paul L.; Tatchyn, Roman O.

    1989-01-24

    Micropole undulators for use in the generation of x-rays from moving charged particles and methods for manufacturing such undulators are disclosed. One type of micropole undulator has two jaws containing rows of spaced apart poles arranged so that each pole produces a magnetic field aligned with all other similar fields. An external biasing field extends through the jaws so that an overall undulator field of substantially sinusoidal shape and substantially zero average value extends along the undulator axis. Preferably, the poles are bars formed of a magnetizable, but unmagnetized, material so that, after the jaws are assembled, all of the bars can be magnetized simultaneously in a uniform magnetic field of suitable strength. Another type of micropole undulator incorporates two parallel layers which have been magnetized to provide rows of alternating magnetic fields extending in opposite directions, the layers being positioned between the pole faces of a highly magnetically permeable material with the south poles of one layer opposite the north poles of the other. Poles in the layers are formed by subjecting successive regions of each layer to oppositely directed and suitably varied magnetizing forces.

  6. The JLAB UV Undulator

    SciTech Connect (OSTI)

    Gottschalk, Steven C.; Benson, Steven V.; Moore, Steven Wesley

    2013-05-01

    Recently the JLAB FEL has demonstrated 150 W at 400 nm and 200 W at 700 nm using a 33mm period undulator designed and built by STI Optronics. This paper describes the undulator design and performance. Two key requirements were low phase error, zero steering and offset end fields and small rms trajectory errors. We will describe a new genetic algorithm that allowed phase error minimization to 1.8 degrees while exceeding specifications. The mechanical design, control system and EPICS interface will also be summarized.

  7. Micropole undulator

    DOE Patents [OSTI]

    Tatchyn, Roman O.; Csonka, Paul L.; Cremer, Jay T.

    1990-12-11

    Micropole undulators for use in the generation of x-rays from moving charged particles are disclosed. Two rows of spaced apart poles are arranged so that each pole produces a magnetic field aligned with all other similar fields. The poles are the ends of "C"-shaped magnets. In each row, adjacent poles are separated by spacers made of a superconducting material.

  8. Micropole undulator

    DOE Patents [OSTI]

    Tatchyn, R.O.; Csonka, P.L.; Cremer, J.T.

    1990-12-11

    Micropole undulators for use in the generation of x-rays from moving charged particles are disclosed. Two rows of spaced apart poles are arranged so that each pole produces a magnetic field aligned with all other similar fields. The poles are the ends of C''-shaped magnets. In each row, adjacent poles are separated by spacers made of a superconducting material. 11 figs.

  9. TESTING AND PERFORMANCE ANALYSIS OF NASA 5 CM BY 5 CM BI-SUPPORTED SOLID OXIDE ELECTROLYSIS CELLS OPERATED IN BOTH FUEL CELL AND STEAM ELECTROLYSIS MODES

    SciTech Connect (OSTI)

    R. C. O'Brien; J. E. O'Brien; C. M. Stoots; X. Zhang; S. C. Farmer; T. L. Cable; J. A. Setlock

    2011-11-01

    A series of 5 cm by 5 cm bi-supported Solid Oxide Electrolysis Cells (SOEC) were produced by NASA for the Idaho National Laboratory (INL) and tested under the INL High Temperature Steam Electrolysis program. The results from the experimental demonstration of cell operation for both hydrogen production and operation as fuel cells is presented. An overview of the cell technology, test apparatus and performance analysis is also provided. The INL High Temperature Steam Electrolysis laboratory has developed significant test infrastructure in support of single cell and stack performance analyses. An overview of the single cell test apparatus is presented. The test data presented in this paper is representative of a first batch of NASA's prototypic 5 cm by 5 cm SOEC single cells. Clearly a significant relationship between the operational current density and cell degradation rate is evident. While the performance of these cells was lower than anticipated, in-house testing at NASA Glenn has yielded significantly higher performance and lower degradation rates with subsequent production batches of cells. Current post-test microstructure analyses of the cells tested at INL will be published in a future paper. Modification to cell compositions and cell reduction techniques will be altered in the next series of cells to be delivered to INL with the aim to decrease the cell degradation rate while allowing for higher operational current densities to be sustained. Results from the testing of new batches of single cells will be presented in a future paper.

  10. Performance Evaluation of Undulator Radiation at CEBAF

    SciTech Connect (OSTI)

    Chuyu Liu, Geoffrey Krafft, Guimei Wang

    2010-05-01

    The performance of undulator radiation (UR) at CEBAF with a 3.5 m helical undulator is evaluated and compared with APS undulator-A radiation in terms of brilliance, peak brilliance, spectral flux, flux density and intensity distribution.

  11. Soft x-ray undulator for the Siam Photon Source

    SciTech Connect (OSTI)

    Rugmai, S.; Dasri, T.; Prawanta, S.; Siriwattanapaitoon, S.; Kwankasem, A.; Sooksrimuang, V.; Chachai, W.; Suradet, N.; Juthong, N.; Tancharakorn, S.

    2007-01-19

    An undulator for production of intense soft x-rays has been designed for the Siam Photon Source. The construction of the undulator has been completed. It is now being characterized and prepared for installation. The device, named U60, is a pure permanent magnet planar undulator, consisting of 41 magnetic periods, with 60 mm period length. Utilization of the undulator radiation in the photon energy range of 30 - 900 eV is expected. The design studies of the magnetic structure, including investigation of perturbations arising from the magnetic field of the device, their effects on the SPS storage ring and compensation schemes are described. A magnetic measurement system has been constructed for magnetic characterization of the device. Partial results of magnetic measurements are presented.

  12. An Undulator Based Polarized Positron Source for CLIC

    SciTech Connect (OSTI)

    Liu, Wanming; Gai, Wei; Rinolfi, Louis; Sheppard, John; /SLAC

    2012-07-02

    A viable positron source scheme is proposed that uses circularly polarized gamma rays generated from the main 250 GeV electron beam. The beam passes through a helical superconducting undulator with a magnetic field of {approx} 1 Tesla and a period of 1.15 cm. The gamma-rays produced in the undulator in the energy range between {approx} 3 MeV - 100 MeV will be directed to a titanium target and produce polarized positrons. The positrons are then captured, accelerated and transported to a Pre-Damping Ring (PDR). Detailed parameter studies of this scheme including positron yield, and undulator parameter dependence are presented. Effects on the 250 GeV CLIC main beam, including emittance growth and energy loss from the beam passing through the undulator are also discussed.

  13. Conceptual Design for Superconducting Planar Helical Undulator

    SciTech Connect (OSTI)

    Sasaki, Shigemi

    2004-05-12

    A preliminary consideration was made on a short-period superconducting planar helical undulator (SCHU) for circularly polarized radiation. The SCHU consists of coils and iron poles/yokes. There is no magnetic structure in the horizontal plane of the electron orbit. The SCHU would provide the large horizontal aperture needed to allow injection into the storage ring. The expected field strength is at least 30% larger than that by an APPLE-type permanent-magnet device with the same gap and the same period.

  14. U10.0 Undulator conceptual design report

    SciTech Connect (OSTI)

    Hoyer, E.

    1994-06-01

    The U10.0 Undulator described here is a 43 period, 10 cm period, 4.5 meter long insertion device. Designed for the Advanced Light Source (ALS) storage ring at the Lawrence Berkeley Laboratory. This insertion device will provide high brightness, quasi-monochromatic radiation in the 5-950 eV energy range. This conceptual design report includes sections on: parameter development, spectral performance, and accelerator requirements, physics specifications and the detailed conceptual design of the magnetic structure, the support/drive systems, the insertion device control system, the vacuum system, and installation for the U10.0 Undulator.

  15. Transition undulator radiation as bright infrared sources

    SciTech Connect (OSTI)

    Kim, K.J.

    1995-02-01

    Undulator radiation contains, in addition to the usual component with narrow spectral features, a broad-band component in the low frequency region emitted in the near forward direction, peaked at an angle 1/{gamma}, where {gamma} is the relativistic factor. This component is referred to as the transition undulator radiation, as it is caused by the sudden change in the electron`s longitudinal velocity as it enters and leaves the undulator. The characteristic of the transition undulator radiation are analyzed and compared with the infrared radiation from the usual undulator harmonics and from bending magnets.

  16. Hydraulic and Clean-in-Place Evaluations for a 12.5-cm Annular Centrifugal Contactor at INL

    SciTech Connect (OSTI)

    Troy G. Garn; David H. Meikrantz; Nick R. Mann; Jack D. Law; Terry A. Todd

    2008-09-01

    Hydraulic and Clean-in-Place Evaluations for a 12.5 cm Annular Centrifugal Contactor at the INL Troy G. Garn, Dave H. Meikrantz, Nick R. Mann, Jack D. Law, Terry A. Todd Idaho National Laboratory Commercially available, Annular Centrifugal Contactors (ACC) are currently being evaluated for processing dissolved nuclear fuel solutions to selectively partition integrated elements using solvent extraction technologies. These evaluations include hydraulic and clean-in-place (CIP) testing of a commercially available 12.5 cm unit. Data from these evaluations is used to support design of future nuclear fuel reprocessing facilities. Hydraulic testing provides contactor throughput performance data on two-phase systems for a wide range of operating conditions. Hydraulic testing results on a simple two-phase oil and water system followed by a 30 % Tributyl phosphate in N-dodecane / nitric acid pair are reported. Maximum total throughputs for this size contactor ranged from 20 to 32 liters per minute without significant other phase carryover. A relatively new contactor design enhancement providing Clean-in-Place capability for ACCs was also investigated. Spray nozzles installed into the central rotor shaft allow the rotor internals to be cleaned, offline. Testing of the solids capture of a diatomaceous earth/water slurry feed followed by CIP testing was performed. Solids capture efficiencies of >95% were observed for all tests and short cold water cleaning pulses proved successful at removing solids from the rotor.

  17. MaRIE Undulator & XFEL Systems

    SciTech Connect (OSTI)

    Nguyen, Dinh Cong; Marksteiner, Quinn R.; Anisimov, Petr Mikhaylovich; Buechler, Cynthia Eileen

    2015-03-23

    The 22 slides in this presentation treat the subject under the following headings: MaRIE XFEL Performance Parameters, Input Electron Beam Parameters, Undulator Design, Genesis Simulations, Risks, and Summary It is concluded that time-dependent Genesis simulations show the MaRIE XFEL can deliver the number of photons within the required bandwidth, provided a number of assumptions are met; the highest risks are associated with the electron beam driving the XFEL undulator; and risks associated with the undulator and/or distributed seeding technique may be evaluated or retired by performing early validation experiments.

  18. Fast pulsed excitation wiggler or undulator

    DOE Patents [OSTI]

    van Steenbergen, Arie (Shoreham, NY)

    1990-01-01

    A fast pulsed excitation, electromagnetic undulator or wiggler, employing geometrically alternating substacks of thin laminations of ferromagnetic material, together with a single turn current loop excitation of the composite assembly, of such shape and configuration that intense, spatially alternating, magnetic fields are generated; for use as a pulsed mode undulator or wiggler radiator, for use in a Free Electron Laser (FEL) type radiation source or, for use in an Inverse Free Electron Laser (IFEL) charged particle accelerator.

  19. Undulator Hall Air Temperature Fault Scenarios

    SciTech Connect (OSTI)

    Sevilla, J.; Welch, J.; ,

    2010-11-17

    Recent experience indicates that the LCLS undulator segments must not, at any time following tuning, be allowed to change temperature by more than about {+-}2.5 C or the magnetic center will irreversibly shift outside of acceptable tolerances. This vulnerability raises a concern that under fault conditions the ambient temperature in the Undulator Hall might go outside of the safe range and potentially could require removal and retuning of all the segments. In this note we estimate changes that can be expected in the Undulator Hall air temperature for three fault scenarios: (1) System-wide power failure; (2) Heating Ventilation and Air Conditioning (HVAC) system shutdown; and (3) HVAC system temperature regulation fault. We find that for either a system-wide power failure or an HVAC system shutdown (with the technical equipment left on), the short-term temperature changes of the air would be modest due to the ability of the walls and floor to act as a heat ballast. No action would be needed to protect the undulator system in the event of a system-wide power failure. Some action to adjust the heat balance, in the case of the HVAC power failure with the equipment left on, might be desirable but is not required. On the other hand, a temperature regulation failure of the HVAC system can quickly cause large excursions in air temperature and prompt action would be required to avoid damage to the undulator system.

  20. Coherent Radiation Effects in the LCLS Undulator

    SciTech Connect (OSTI)

    Reiche, S.; /UCLA; Huang, Z.; /SLAC

    2010-12-14

    For X-ray Free-Electron Lasers such as LCLS and TESLA FEL, a change in the electron energy while amplifying the FEL radiation can shift the resonance condition out of the bandwidth of the FEL. The largest sources of energy loss is the emission of incoherent undulator radiation. Because the loss per electron depends only on the undulator parameters and the beam energy, which are fixed for a given resonant wavelength, the average energy loss can be compensated for by a fixed taper of the undulator. Coherent radiation has a strong enhancement proportional to the number of electrons in the bunch for frequencies comparable to or longer than the bunch dimension. If the emitted coherent energy becomes comparable to that of the incoherent emission, it has to be included in the taper as well. However, the coherent loss depends on the bunch charge and the applied compression scheme and a change of these parameters would require a change of the taper. This imposes a limitation on the practical operation of Free-Electron Lasers, where the taper can only be adjusted manually. In this presentation we analyze the coherent emission of undulator radiation and transition undulator radiation for LCLS, and estimate whether the resulting energy losses are significant for the operation of LCLS.

  1. Planar Undulator Considerations(LCC-0085)

    SciTech Connect (OSTI)

    Sheppard, J

    2003-10-07

    This note consists of informal working notes that document an effort to understand the TESLA baseline, unpolarized, undulator based positron source. This is the first step in the design process of an undulator based positron system for the NLC. The expressions and methodologies developed herein are used in subsequent memos that reference this note. In regards to the TESLA design, it is found that a 135 m long (versus 100 m length) undulator is consistent with the performance descriptions in the TDR text. And while operation of the TESLA system with a 250 GeV drive beam energy provides a safety margin of a factor of {approx}2 in e{sup +} yield, operation of the same system at 160 GeV results in a yield of about 0.6.

  2. Strong permanent magnet-assisted electromagnetic undulator

    DOE Patents [OSTI]

    Halbach, Klaus

    1988-01-01

    This invention discloses an improved undulator comprising a plurality of electromagnet poles located along opposite sides of a particle beam axis with alternate north and south poles on each side of the beam to cause the beam to wiggle or undulate as it travels generally along the beam axis and permanent magnets spaced adjacent the electromagnetic poles on each side of the axis of said particle beam in an orientation sufficient to reduce the saturation of the electromagnet poles whereby the field strength of the electromagnet poles can be increased beyond the normal saturation levels of the electromagnetic poles.

  3. Operation of a small-gap undulator on the NSLS X-ray Ring

    SciTech Connect (OSTI)

    Stefan, P.M.; Krinsky, S.; Rakowsky, G.; Solomon, L.

    1995-02-01

    The authors report results of an on-going experiment being carried out in the X13 straight section of the NSLS X-ray Ring which explores the limits of the operation of small-gap undulators. In particular, they discuss the operation of a 16 mm period small-gap undulator. At an electron beam current of 300 mA the variable gap vacuum chamber has been closed to an inner aperture of 3.8 mm with no effect on the electron beam lifetime. Measurements of the output radiation spectrum at a magnet gap of 7.5 mm are described.

  4. Undulator Radiation Damage Experience at LCLS

    SciTech Connect (OSTI)

    Nuhn, H. D.; Field, C.; Mao, S.; Levashov, Y.; Santana, M.; Welch, J. N.; Wolf, Z.

    2015-01-06

    The SLAC National Accelerator Laboratory has been running the Linac Coherent Light Source (LCLS), the first x-ray Free Electron Laser since 2009. Undulator magnet damage from radiation, produced by the electron beam traveling through the 133-m long straight vacuum tube, has been and is a concern. A damage measurement experiment has been performed in 2007 in order to obtain dose versus damage calibrations. Radiation reduction and detection devices have been integrated into the LCLS undulator system. The accumulated radiation dose rate was continuously monitored and recorded. In addition, undulator segments have been routinely removed from the beamline to be checked for magnetic (50 ppm, rms) and mechanic (about 0.25 µm, rms) changes. A reduction in strength of the undulator segments is being observed, at a level, which is now clearly above the noise. Recently, potential sources for the observed integrated radiation levels have been investigated. The paper discusses the results of these investigation as well as comparison between observed damage and measured dose accumulations and discusses, briefly, strategies for the new LCLS-II upgrade, which will be operating at more than 300 times larger beam rate.

  5. Progress on the superconducting undulator for ANKA and on the instrumentation for R and D

    SciTech Connect (OSTI)

    Casalbuoni, Sara; Baumbach, Tilo; Grau, Andreas; Hagelstein, Michael; Saez de Jauregui, David; Boffo, Cristian; Borlein, Markus; Walter, Wolfgang; Magerl, Andreas; Mashkina, Elena; Vassiljev, Nikita

    2010-06-23

    Superconducting undulators show a larger magnetic field strength for the same gap and period length, as compared to permanent magnet devices, which allows to generate X-ray beams of higher brilliance and with harder spectrum. The worldwide first short period length superconducting undulator is in operation since 2005 at the synchrotron light source ANKA in Karlsruhe [1]. To further drive the development in this field a research and development program is being carried out. In this contribution we report on the last progress of the construction of a 1.5 m long superconducting undulator with a period length of 15 mm, planned to be installed in ANKA beginning 2010 to be the light source of the new beamline NANO for high resolution X-ray scattering. The key specifications of the system are an undulator parameter K higher than 2 (with a magnetic gap of 5 mm) and a phase error smaller than 3.5 degrees. Cryocoolers will keep the coils at 4.2 K for a beam heat load of 4 W. The ongoing R and D includes improvements in understanding of the magnetic field properties and of the beam heat load mechanisms. The tools and instruments under development to fulfill these tasks are also discussed.

  6. Proposed Laser-driven, Dielectric Microstructure Few-cm Long Undulator for Attosecond Coherent X-rays

    SciTech Connect (OSTI)

    Plettner, T; Byer, R.L.; /Stanford U., Ginzton Lab.

    2011-09-16

    This article presents the concept of an all-dielectric laser-driven undulator for the generation of coherent X-rays. The proposed laser-driven undulator is expected to produce internal deflection forces equivalent to a several-Tesla magnetic field acting on a speed-of-light particle. The key idea for this laser-driven undulator is its ability to provide phase synchronicity between the deflection force and the electron beam for a distance that is much greater than the laser wavelength. The potential advantage of this undulator is illustrated with a possible design example that assumes a small laser accelerator which delivers a 2 GeV, 1 pC, 1 kHz electron bunch train to a 10 cm long, 1/2 mm period laser-driven undulator. Such an undulator could produce coherent X-ray pulses with {approx}10{sup 9} photons of 64 keV energy. The numerical modeling for the expected X-ray pulse shape was performed with GENESIS, which predicts X-ray pulse durations in the few-attosecond range. Possible applications for nonlinear electromagnetic effects from these X-ray pulses are briefly discussed.

  7. A Fixed Gap APPLE II Undulator for SLS

    SciTech Connect (OSTI)

    Schmidt, T.; Imhof, A.; Ingold, G.; Jakob, B.; Vollenweider, C.

    2007-01-19

    To vary the polarization vector of an APPLE II undulator continuously from 0 - 180 deg., all four magnet arrays need to be movable. Following the adjustable-phase undulator approach by R. Carr, a 3.4 m long fixed gap undulator for SLS with a gap of 11.6 mm has been constructed. It will be installed in fall 2006. The gap drive is replaced by a pair-wise shift of the magnet arrays to change the energy, while the polarization is changed by shifts of diagonal arrays. The high injection efficiency and standard operation top-up mode at the SLS allows this simplified undulator design. The design as well as the operational aspects will be discussed.

  8. Initial studies of Bremsstrahlung energy deposition in small-bore superconducting undulator structures in linac environments

    SciTech Connect (OSTI)

    Cremer, T.; Tatchyn, R.

    1995-12-31

    One of the more promising technologies for developing minimal-length insertion devices for linac-driven, single-pass Free Electron Lasers (FELs) operating in the x-ray range is based on the use of superconducting (SC) materials. In recent FEL simulations, for example, a bifilar helical SC device with a 2 cm period and 1.8 T field was found to require a 30 m saturation length for operation at 1.5{Angstrom} on a 15 GeV linac, more than 40% shorter than an alternative hybrid/permanent magnet (hybrid/PM) undulator. AT the same time, however, SC technology is known to present characteristic difficulties for insertion device design, both in engineering detail and in operation. Perhaps the most critical problem, as observed, e.g., by Madey and co-workers in their initial FEL experiments, was the frequent quenching induced by scattered electrons upstream of their (bifilar) device. Postulating that this quenching was precipitated by directly-scattered or bremsstrahlung-induced particle energy deposited into the SC material or into material contiguous with it, the importance of numerical and experimental characterizations of this phenomenon for linac-based, user-facility SC undulator design becomes evident. In this paper we discuss selected prior experimental results and report on initial EGS4 code studies of scattered and bremsstrahlung induced particle energy deposition into SC structures with geometries comparable to a small-bore bifilar helical undulator.

  9. Commissioning of the Delta Polarizing Undulator at LCLS

    SciTech Connect (OSTI)

    Nuhn, Heinz-Dieter

    2015-09-25

    The Linac Coherent Light Source (LCLS) generates linearly polarized, intense, high-brightness x-ray pulses from planar fixed-gap undulators. While the fixed-gap design supports a very successful and tightly controlled alignment concept, it provides only limited taper capability (up to 1% through canted pole and horizontal position adjustability) and lacks polarization control. The latter is of great importance for soft x-ray experiments. A new 3.2-m-long compact undulator (based on the Cornell University Delta design) has been developed and installed in place of the last LCLS undulator segment (U33) in October 2014. This undulator provides full control of the polarization degree and K value. Used on its own, it produces fully polarized radiation in the selected state (linear, circular or elliptical) but at low intensity. To increase the output power by orders of magnitude, the electron beam is micro-bunched by several (~10) of the upstream LCLS undulator segments operated in the linear FEL regime. As unavoidable by-product, this microbunching process produces moderate amounts of horizontally linear polarized radiation which mixes with the radiation produced by the Delta undulator. This unwanted radiation component has been greatly reduced by the reverse taper configuration, as suggested by E. Schneidmiller and M. Yurkov. Full elimination of the linear polarized component was achieved through spatial separation combined with transverse collimation. The paper describes these and other methods tested during commissioning. It also presents results of polarization measurements showing high degrees of circular polarization in the soft x-ray wavelength range (500 eV - 1500 eV).

  10. Undulators for the BESSY SASE-FEL Project

    SciTech Connect (OSTI)

    Bahrdt, J.; Frentrup, W.; Gaupp, A.; Kuske, B.; Meseck, A.; Scheer, M.

    2004-05-12

    BESSY plans to build a SASE-FEL facility for the energy range from 20 eV to 1000 eV. The energy range will be covered by three APPLE II type undulators with a magnetic length of about 60 m each. This paper summarizes the basic parameters of the FEL-undulators. The magnetic design will be presented. A modified APPLE II design will be discussed which provides higher fields at the expense of reduced horizontal access. GENESIS simulations give an estimate on the tolerances for the beam wander and for gap errors.

  11. A strong permanent magnet-assisted electromagnetic undulator

    DOE Patents [OSTI]

    Halbach, K.

    1987-01-30

    This invention discloses an improved undulator comprising a plurality of electromagnet poles located along opposite sides of a particle beam axis with alternate north and south poles on each side of the beam to cause the beam to wiggle or undulate as it travels generally along the beam axis and permanent magnets spaced adjacent the electromagnetic poles on each side of the axis of said particle beam in an orientation sufficient to reduce the saturation of the electromagnet poles whereby the field strength of the electromagnet poles can be increased beyond the normal saturation levels of the electromagnetic poles. 4 figs.

  12. Beamline 7.0.2

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

    Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables ...

  13. Undulator-Based Production of Polarized Positrons, A Proposal for the 50-GeV Beam in the FFTB

    SciTech Connect (OSTI)

    G. Alexander; P. Anthony; V. Bharadwaj; Yu.K. Batygin; T. Behnke; S. Berridge; G.R. Bower; W. Bugg; R. Carr; E. Chudakov; J.E. Clendenin; F.J. Decker; Yu. Efremenko; T. Fieguth; K. Flottmann; M. Fukuda; V. Gharibyan; T. Handler; T. Hirose; R.H. Iverson; Yu. Kamyshkov; H. Kolanoski; T. Lohse; Chang-guo Lu; K.T. McDonald; N. Meyners; R. Michaels; A.A. Mikhailichenko; K. Monig; G. Moortgat-Pick; M. Olson; T. Omori; D. Onoprienko; N. Pavel; R. Pitthan; M. Purohit; L. Rinolfi; K.P. Schuler; J.C. Sheppard; S. Spanier; A. Stahl; Z.M. Szalata; J. Turner; D. Walz; A. Weidemann; J. Weisend

    2003-06-01

    The full exploitation of the physics potential of future linear colliders such as the JLC, NLC, and TESLA will require the development of polarized positron beams. In the proposed scheme of Balakin and Mikhailichenko [1] a helical undulator is employed to generate photons of several MeV with circular polarization which are then converted in a relatively thin target to generate longitudinally polarized positrons. This experiment, E-166, proposes to test this scheme to determine whether such a technique can produce polarized positron beams of sufficient quality for use in future linear colliders. The experiment will install a meter-long, short-period, pulsed helical undulator in the Final Focus Test Beam (FFTB) at SLAC. A low-emittance 50-GeV electron beam passing through this undulator will generate circularly polarized photons with energies up to 10 MeV. These polarized photons are then converted to polarized positrons via pair production in thin targets. Titanium and tungsten targets, which are both candidates for use in linear colliders, will be tested. The experiment will measure the flux and polarization of the undulator photons, and the spectrum and polarization of the positrons produced in the conversion target, and compare the measurement results to simulations. Thus the proposed experiment directly tests for the first time the validity of the simulation programs used for the physics of polarized pair production in finite matter, in particular the effects of multiple scattering on polarization. Successful comparison of the experimental results to the simulations will lead to greater confidence in the proposed designs of polarized positrons sources for the next generation of linear colliders. This experiment requests six-weeks of time in the FFTB beam line: three weeks for installation and setup and three weeks of beam for data taking. A 50-GeV beam with about twice the SLC emittance at a repetition rate of 30 Hz is required.

  14. Preparing the BESSY APPLE Undulators for Top-Up Operation

    SciTech Connect (OSTI)

    Bahrdt, J.; Frentrup, W.; Gaupp, A.; Scheer, M.

    2007-01-19

    BESSY plans to go to topping up operation in the near future. A high injection efficiency is essential to avoid particle losses inside the undulator magnets and to ensure a low radiation background in the beamlines. Dynamic and static multipoles of the insertion devices have to be minimized to accomplish this requirement. APPLE II devices show strong dynamic multipoles in the elliptical and vertical polarization mode. Measurements before and after shimming of these multipoles are presented. The static multipoles of the BESSY UE56-2 which are due to systematic block inhomgeneities have successfully been shimmed recovering the full dynamic aperture.

  15. Calculated Performance Of The Variable-Polarization Undulator Upgrade To The Daresbury SRS Soft X-Ray Undulator Beamline

    SciTech Connect (OSTI)

    Roper, Mark D.; Bird, Daniel T.

    2004-05-12

    The soft x-ray beamline 5U1 on the Daresbury Laboratory SRS currently uses a planar undulator, producing linearly polarized radiation in the range 100 to 1000 eV. The undulator is soon to be replaced by a variable-polarization device of the Apple II design. The aim is to produce circularly polarized light in the energy range 265 to 1000 eV, covering the K-edges of C, N and O, and the first row transition element L-edges. This will greatly enhance the provision of circularly polarized soft-x-rays on the SRS and open up new opportunities for experimenters. The device will also produce linear polarization with a selectable angle of polarization with respect to the orbit plane, which is currently unavailable on the SRS. In order to provide the coverage over this energy range, we are exploiting the relatively large emittance of the SRS to allow us to use the second and third harmonics even in circular polarization mode. This paper presents the expected beamline output in various polarization modes and the predicted degree of polarization.

  16. Cryogenic performance of a cryocooler-cooled superconducting undulator

    SciTech Connect (OSTI)

    Fuerst, J. D.; Doose, C.; Hasse, Q.; Ivanyushenkov, Y.; Kasa, M.; Shiroyanagi, Y.

    2014-01-29

    A cryocooler-cooled superconducting undulator has been installed and operated with beam at the Advanced Photon Source (APS) at Argonne National Laboratory (ANL). The device consists of a dual-core 42-pole magnet structure that is cooled to 4.2 K with a system of four cryocoolers operating in a zero-boil-off configuration. This effort represents the culmination of a development program to establish concept feasibility and evaluate cryostat design and cryocooler-based refrigeration. Cryostat performance is described including cool-down/warm-up, steady-state operation, cooling margin, and the impact of beam during operation in the APS storage ring. Plans for future devices with longer magnets, which will incorporate lessons learned from the development program, are also discussed.

  17. Gap solitons in rocking optical lattices and waveguides with undulating gratings

    SciTech Connect (OSTI)

    Mayteevarunyoo, Thawatchai; Malomed, Boris A.

    2009-07-15

    We report results of a systematic analysis of the stability of one-dimensional solitons in a model including the self-repulsive or attractive cubic nonlinearity and a linear potential represented by a periodically shaking lattice, which was recently implemented in experiments with Bose-Einstein condensates. In optics, the same model applies to undulated waveguiding arrays, which are also available to the experiment. In the case of the repulsive nonlinearity, stability regions are presented, in relevant parameter planes, for fundamental gap solitons and their two-peak and three-peak bound complexes, in the first and second finite band gaps. In the model with the attractive nonlinearity, stability regions are produced for fundamental solitons and their bound states populating the semi-infinite gap. In the first finite and semi-infinite gaps, unstable solitons gradually decay into radiation, while, in the second finite band gap, they are transformed into more complex states, which may represent new species of solitons. For a large amplitude of the rocking-lattice drive, the model is tantamount to that with a 'flashing' lattice potential, which is controlled by periodic sequences of instantaneous kicks. Using this correspondence, we explain generic features of the stability diagrams for the solitons. We also derive a limit case of the latter system, in the form of coupled-mode equations with a 'flashing' linear coupling.

  18. Evaluation of the Hydraulic Performance and Mass Transfer Efficiency of the CSSX Process with the Optimized Solvent in a Single Stage of 5.5-Cm Diameter Centrifugal Contactor

    SciTech Connect (OSTI)

    Law, J.D.; Tillotson, R.D.; Todd, T.A.

    2002-09-19

    The Caustic-Side Solvent Extraction (CSSX) process has been selected for the separation of cesium from Savannah River Site high-level waste. The solvent composition used in the CSSX process was recently optimized so that the solvent is no longer supersaturated with respect to the calixarene crown ether extractant. Hydraulic performance and mass transfer efficiency testing of a single stage of 5.5-cm ORNL-designed centrifugal contactor has been performed for the CSSX process with the optimized solvent. Maximum throughputs of the 5.5-cm centrifugal contactor, as a function of contactor rotor speed, have been measured for the extraction, scrub, strip, and wash sections of the CSSX flowsheet at the baseline organic/aqueous flow ratios (O/A) of the process, as well as at O/A's 20% higher and 20% lower than the baseline. Maximum throughputs are comparable to the design throughput of the contactor, as well as with throughputs obtained previously in a 5-cm centrifugal contactor with the non-optimized CSSX solvent formulation. The 20% variation in O/A had minimal effect on contactor throughput. Additionally, mass transfer efficiencies have been determined for the extraction and strip sections of the flowsheet. Efficiencies were lower than the process goal of greater than or equal to 80%, ranging from 72 to 75% for the extraction section and from 36 to 60% in the strip section. Increasing the mixing intensity and/or the solution level in the mixing zone of the centrifugal contactor (residence time) could potentially increase efficiencies. Several methods are available to accomplish this including (1) increasing the size of the opening in the bottom of the rotor, resulting in a contactor which is partially pumping instead of fully pumping, (2) decreasing the number of vanes in the contactor, (3) increasing the vane height, or (4) adding vanes on the rotor and baffles on the housing of the contactor. The low efficiency results obtained stress the importance of proper design of

  19. Evaluation of the Hydraulic Capacity and Mass Transfer Efficiency of the CSSX Process with the Optimized Solvent in a Single Stage of 5.5-cm-Diameter Centrifugal Contactor

    SciTech Connect (OSTI)

    Law, Jack Douglas; Tillotson, Richard Dean; Todd, Terry Allen

    2002-09-01

    The Caustic-Side Solvent Extraction (CSSX) process has been selected for the separation of cesium from Savannah River Site high-level waste. The solvent composition used in the CSSX process was recently optimized so that the solvent is no longer supersaturated with respect to the calixarene crown ether extractant. Hydraulic performance and mass transfer efficiency testing of a single stage of 5.5-cm ORNL-designed centrifugal contactor has been performed for the CSSX process with the optimized solvent. Maximum throughputs of the 5.5-cm centrifugal contactor, as a function of contactor rotor speed, have been measured for the extraction, scrub, strip, and wash sections of the CSSX flowsheet at the baseline organic/aqueous flow ratios (O/A) of the process, as well as at O/A’s 20% higher and 20% lower than the baseline. Maximum throughputs are comparable to the design throughput of the contactor, as well as with throughputs obtained previously in a 5-cm centrifugal contactor with the non-optimized CSSX solvent formulation. The 20% variation in O/A had minimal effect on contactor throughput. Additionally, mass transfer efficiencies have been determined for the extraction and strip sections of the flowsheet. Efficiencies were lower than the process goal of greater than or equal to 80%, ranging from 72 to 75% for the extraction section and from 36 to 60% in the strip section. Increasing the mixing intensity and/or the solution level in the mixing zone of the centrifugal contactor (residence time) could potentially increase efficiencies. Several methods are available to accomplish this including (1) increasing the size of the opening in the bottom of the rotor, resulting in a contactor which is partially pumping instead of fully pumping, (2) decreasing the number of vanes in the contactor, (3) increasing the vane height, or (4) adding vanes on the rotor and baffles on the housing of the contactor. The low efficiency results obtained stress the importance of proper design

  20. A possibility for using an APPLE undulator to generate a photon beam with transverse optical modes.

    SciTech Connect (OSTI)

    Sasaki, S.; McNulty, I.; Shimada, T.; JAEA

    2008-01-01

    We investigate use of an APPLE-type undulator for generating Laguerre-Gaussian (LG) and Hermite-Gaussian (HG) mode beams. We find that the second harmonic radiation in the circular mode corresponds to an LG beam with l=1, and the second harmonic in the linear mode corresponds to an HG beam with l=1. The combination of an APPLE undulator and conventional monochromator optics may provide an opportunity for a new type of experimental research in the synchrotron radiation community.

  1. 20 keV undulators for a 6-GeV storage ring

    SciTech Connect (OSTI)

    Kim, S.H.; Cho, Y.

    1985-01-01

    The main goal of the future 6-GeV electron storage ring is to provide 20-keV fundamental harmonic radiations from insertion devices. Parameter restrictions of REC-vanadium permendur hybrid undulators have been examined. The critical factor is the achievable minimum gap of the undulator. Variations of the spectral brilliance for different beam parameters are also shown. 6 refs., 5 figs.

  2. Waveguide Structures for RF Undulators with Applications to FELs and Storage Rings

    SciTech Connect (OSTI)

    Yeddulla, M.; Geng, H.G.; Huang, Z.; Ma, Z.; Tantawi, S.G.; /SLAC

    2011-11-02

    RF undulators, suggested a long time ago, have the advantage of fast dynamic control of polarization, undulator strength and wavelength. However, RF undulators require very strong RF fields in order to produce radiation of the same order as conventional static devices. Very high power RF energy confined inside a waveguide or a cavity can provide the necessary RF fields to undulate the electron beam. However, the wall losses in the waveguide should be low enough to make it practically feasible as a CW or quasi CW undulator and, hence, competitive with static devices for applications to storage rings and FELs. Here we present various waveguide structures such as smooth walled and corrugated walled waveguides and various RF modes. We will show that there are some advantages in operating with higher order modes and also with hybrid modes in the corrugated guide. We will show that the RF power requirement for some of these modes will permit a quasi CW operation of the undulator, thus permitting its operation in a storage ring.

  3. Indentation and overall compression behavior of multilayered thin-film composites. Effect of undulating layer geometry

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Jamison, Ryan D.; Shen, Y. -L.

    2015-03-19

    Two finite element models are used to investigate the behavior of aluminum/silicon carbide thin-film layered composites with imperfect internal geometry when subjected to various loadings. In both models, undulating layers are represented by regular waveforms with various amplitudes, wavelengths, and phase offsets. First, uniaxial compressive loading of the composite is considered. The modulus and stress/strain response of the composite is sensitive to both loading direction and frequency of the undulation. Second, the nanoindentation response of the composite is investigated. The derived hardness and modulus are shown to be sensitive to the presence of undulating layers and the relative size ofmore » the indenter to the undulation. Undulating layers create bands of tensile and compressive stress in the indentation direction that are significantly different from the flat layers. The amount of equivalent plastic strain in the Al layers is increased by the presence of undulating layers. The correlations between the two forms of loading, and the implications to composite property measurement are carefully examined in this study.« less

  4. Long wavelength undulations dominate dynamics in large surfactant membrane patches

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Lipfert, Frederik; Holderer, Olaf; Frielinghaus, Henrich; Appavou, Marie-Sousai; Do, Changwoo; Ohl, Michael E.; Richter, Dieter

    2014-12-03

    In this study, by exposing microemulsions to small (80 nm diameter) and large (500 nm) disk shaped clay particles we were able to show the presence of long wavelength undulations that only occur for large membrane patches. A combination of small angle neutron scattering (SANS) and neutron spin echo (NSE) experiments have been applied to study microemulsions. These, consisting of D2O, d-decane and the surfactant C10E4, were used in connection with Laponite (small) and Nanofil (large) clay. To our knowledge our experiments show for the first time that the clay platelets induce lamellar ordering adjacent to the clay discs inmore » the otherwise bicontinuous microemulsion. This is due to the fact that in purely structural investigations, radial averaging smears out the signature of the lamellar phase. For thermodynamically fluctuating membranes near interfaces the theory of Seifert predicts a cross-over of the dispersion relationship from k2 to a k3-dependence. Lastly, with the correlation length of the membrane patches being confined by the dimension of the clay platelets we were able to show that this in fact takes place but is only present for the larger Nanofil particles.« less

  5. Energy Loss and Energy Spread Growth in a Planar Undulator(LCC-0086)

    SciTech Connect (OSTI)

    Sheppard, J

    2003-10-07

    The change in beam energy spread due to transmission through a long, planar undulator is calculated. This change is shown to be gaussian as expected from the central limit theorem and large number of photons emitted per electron. These results are compared with Saldin et al. [2] expressions. Numerical results for the case of the TESLA beam and for an NLC beam are given.

  6. Beamline 8.0.1

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

    Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925 linesmm) ...

  7. Negative-mass mitigation of Coulomb repulsion for terahertz undulator radiation of electron bunches

    SciTech Connect (OSTI)

    Balal, N.; Magory, E.; Bandurkin, I. V.; Bratman, V. L.; Savilov, A. V.

    2015-10-19

    It is proposed to utilize the effect of negative mass for stabilization of the effective axial size of very dense and short electron bunches produced by photo-injector guns by using combined undulator and strong uniform magnetic fields. It has been shown that in the “abnormal” regime, an increase in the electron energy leads to a decrease in the axial velocity of the electron; due to the negative-mass effect, the Coulomb repulsion of electrons leads to their attraction and formation of a fairly stable and compact bunch “nucleus.” An undulator with a strong uniform magnetic field providing the negative-mass effect is designed for an experimental source of terahertz radiation. The use of the negative-mass regime in this experiment should result in a long-pulse coherent spontaneous undulator emission from a short dense moderately relativistic (5.5 MeV) photo-injector electron bunch with a high (up to 20%) efficiency and a narrow frequency spectrum.

  8. Canted Undulator Upgrade for GeoSoilEnviroCARS Sector 13 at the Advanced Photon Source

    SciTech Connect (OSTI)

    Sutton, Stephen

    2013-02-02

    Support for the beamline component of the canted undulator upgrade of Sector 13 (GeoSoilEnviroCARS; managed and operated by the University of Chicago) at the Advanced Photon Source (APS; Argonne National Laboratory) was received from three agencies (equally divided): NASA-SRLIDAP (now LARS), NSF-EAR-IF (ARRA) and DOE-Single Investigator Small Group (SISGR). The associated accelerator components (undulators, canted front end) were provided by the APS using DOE-ARRA funding. The intellectual merit of the research enabled by the upgrade lies in advancing our knowledge of the composition, structure and properties of earth materials; the processes they control; and the processes that produce them. The upgrade will facilitate scientific advances in the following areas: high pressure mineral physics and chemistry, non-crystalline and nano-crystalline materials at high pressure, chemistry of hydrothermal fluids, reactions at mineral-water interfaces, biogeochemistry, oxidation states of magmas, flow dynamics of fluids and solids, and cosmochemistry. The upgrade, allowing the microprobe to operate 100% of the time and the high pressure and surface scattering and spectroscopy instruments to receive beam time increases, will facilitate much more efficient use of the substantial investment in these instruments. The broad scientific community will benefit by the increase in the number of scientists who conduct cutting-edge research at GSECARS. The user program in stations 13ID-C (interface scattering) and 13ID-D (laser heated diamond anvil cell and large volume press) recommenced in June 2012. The operation of the 13ID-E microprobe station began in the Fall 2012 cycle (Oct.-Dec 2012). The upgraded canted beamlines double the amount of undulator beam time at Sector 13 and provide new capabilities including extended operations of the X-ray microprobe down to the sulfur K edge and enhanced brightness at high energy. The availability of the upgraded beamlines will advance the

  9. Single shot polarization characterization of XUV FEL pulses from crossed polarized undulators

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Ferrari, E.; Allaria, E.; Buck, J.; De Ninno, G.; Diviacco, B.; Gauthier, D.; Giannessi, L.; Glaser, L.; Huang, Z.; Ilchen, M.; et al

    2015-08-28

    Polarization control is a key feature of light generated by short-wavelength free-electron lasers. In this work, we report the first experimental characterization of the polarization properties of an extreme ultraviolet high gain free-electron laser operated with crossed polarized undulators. We research the average degree of polarization and the shot-to-shot stability and we analyze aspects such as existing possibilities for controlling and switching the polarization state of the emitted light. The results are in agreement with predictions based on Gaussian beams propagation.

  10. Characterization of the Support and Drive System of the PETRA III APPLE Undulator

    SciTech Connect (OSTI)

    Bahrdt, J.; Baecker, H.-J.; Frentrup, W.; Gaupp, A.; Gottschlich, S.; Kuhn, C.; Scheer, M.; Schulz, B.; Gast, M.; Englisch, U.; Schoeps, A.; Tischer, M.

    2010-06-23

    Helmholtzzentrum Berlin has built an APPLE II undulator for the storage ring PETRA III. The device has a total length of 5m and a minimum gap of 11mm. The high magnetic forces in particular in the inclined mode have been analyzed by means of finite element methods (FEM). Specific mechanic components such as flexible joints have been optimized to cope with the gap- and shift-dependent 3D-forces and a sophisticated control and drive system has been implemented. After completion of the device, detailed laser interferometer measurements for all operation modes have been performed. The data are compared to the FEM simulations.

  11. Simulation and measurement of the electrostatic beam kicker in the low-energy undulator test line.

    SciTech Connect (OSTI)

    Waldschmidt, G. J.

    1998-10-27

    An electrostatic kicker has been constructed for use in the Low-Energy Undulator Test Line (LEUTL) at the Advanced Photon Source (APS). The function of the kicker is to limit the amount of beam current to be accelerated by the APS linac. Two electrodes within the kicker create an electric field that adjusts the trajectory of the beam. This paper will explore the static fields that are set up between the offset electrode plates and determine the reaction of the beam to this field. The kicker was numerically simulated using the electromagnetic solver package MAFIA [1].

  12. A tapered undulator experiment at the ELBE far infrared hybrid-resonator oscillator free electron laser

    SciTech Connect (OSTI)

    Asgekar, V.; Lehnert, U.; Michel, P.

    2012-01-15

    A tapered undulator experiment was carried out at the ELBE far-infrared free electron laser (FEL). The oscillator FEL makes use of a hybrid optical resonator. The main motivation was to see whether the presence of a dispersive medium in the form of a waveguide in the resonator has any effect on the outcome. The FEL saturated power and the wavelength shifts have been measured as a function of both positive as well as negative undulator field amplitude tapering. In contrast to the typical high-gain FELs where positive tapering proves beneficial for the output power we observed an improvement of performance at negative taper. During the same experiments we studied the characteristics of the detuning curves. The width of the curves indicates a maximum small signal gain for zero taper while the output peak power increases with negative taper. The saturated power output, the detuning curve characteristics, and the wavelength shifts agrees with the theoretical predictions. Details of the experiment are presented.

  13. A table-top x-ray FEL based on a laser wakefield accelerator-undulator system

    SciTech Connect (OSTI)

    Nakajima, K.; Kawakubo, T.; Nakanishi, H.

    1995-12-31

    Ultrahigh-gradient electron acceleration has been confirmed owing to the laser wakefield acceleration mechanism driven by an intense short laser wakefield acceleration mechanism driven by an intense short laser pulse in an underdense plasma. The laser wakefield acceleration makes it possible to build a compact electron linac capable of producing an ultra-short bunched electron beam. While the accelerator is attributed to longitudinal wakefields, transverse wakefields simultaneously generated by a short laser pulse can serve as a plasma undulator with a very short wavelength equal to a half of the plasma wavelength. We propose a new FEL concept for X-rays based on a laser wakefield accelerator-undulator system driven by intense short laser pulses delivered from table-top terawatt lasers. The system is composed of the accelerator stage and the undulator stage in a table-top size. A low energy electron beam is accelerated an bunched into microbunches due to laser wakefields in the accelerator stage. A micro-bunched beam travelling to the opposite direction of driving laser pulses produces coherent X-ray radiation in the undulator stage. A practical configuration and its analyses are presented.

  14. Quantitative analysis of the x-ray diffraction intensities of undulated smectic phases in bent-core liquid crystals

    SciTech Connect (OSTI)

    Folcia, C. L.; Etxebarria, J.; Ortega, J.

    2007-07-15

    X-ray diffraction diagrams of undulated smectic phases in bent-core liquid crystals have been theoretically studied. The intensities of the reflections have been obtained for different layer modulations, and a general expression has been deduced for orthogonal cells in terms of the different harmonics of the distortion. The case of sinusoidal modulation is especially simple and has been studied also in oblique cells. High-quality x-ray measurements of three compounds reported in the literature have been analyzed as examples. In all cases it has been deduced that the modulation is sinusoidal and its amplitude has been easily obtained by fitting the experimental intensities. Equatorial (h0) reflections have been also considered to obtain information about the structure of defects at the maxima and minima of the undulation.

  15. Design Features of a Planar Hybrid/Permanent Magnet Strong Focusing Undulator for Free Electron Laser (FEL) And Synchrotron Radiation (SR) Applications

    SciTech Connect (OSTI)

    Tatchyn, Roman; /SLAC

    2011-09-09

    Insertion devices for Angstrom-wavelength Free Electron Laser (FEL) amplifiers driven by multi-GeV electron beams generally require distributed focusing substantially stronger than their own natural focusing fields. Over the last several years a wide variety of focusing schemes and configurations have been proposed for undulators of this class, ranging from conventional current-driven quadrupoles external to the undulator magnets to permanent magnet (PM) lattices inserted into the insertion device gap. In this paper we present design studies of a flexible high-field hybrid/PM undulator with strong superimposed planar PM focusing proposed for a 1.5 Angstrom Linac Coherent Light Source (LCLS) driven by an electron beam with a 1 mm-mr normalized emittance. Attainable field parameters, tuning modes, and potential applications of the proposed structure are discussed.

  16. Observations of a cold front with strong vertical undulations during the ARM RCS-IOP

    SciTech Connect (OSTI)

    Starr, D.O`C.; Whiteman, D.N.; Melfi, S.H.

    1996-04-01

    Passage of a cold front was observed on the night of April 14-15, 1994, during the Atmospheric Radiation Measurement (ARM) Remote Cloud Sensing (RCS) Intensive Observatios Period (IOP) at the Southern Great Plains Cloud and Radiation Testbed (CART) site near Lamont, Oklahoma. The observations are described.

  17. Period meter for reactors

    DOE Patents [OSTI]

    Rusch, Gordon K.

    1976-01-06

    An improved log N amplifier type nuclear reactor period meter with reduced probability for noise-induced scrams is provided. With the reactor at low power levels a sampling circuit is provided to determine the reactor period by measuring the finite change in the amplitude of the log N amplifier output signal for a predetermined time period, while at high power levels, differentiation of the log N amplifier output signal provides an additional measure of the reactor period.

  18. Monte Carlo Studies of the Radiation Fields in the Linac Coherent Light Source Undulators and of the Corresponding Signals in the Cerenkov Beam Loss Monitors

    SciTech Connect (OSTI)

    Santana Leitner, Mario; Fasso, Alberto; Fisher, Alan S.; Nuhn, Heinz D.; Dooling, Jeffrey C.; Berg, William; Yang, Bin X.; /Argonne

    2010-09-14

    In 2009 the Linac Coherent Light Source (LCLS) at the SLAC National Accelerator Center started free electron laser (FEL) operation. In order to continue to produce the bright and short-pulsed x-ray laser demanded by FEL scientists, this pioneer hard x-ray FEL requires a perfectly tailored magnetic field at the undulators, so that the photons generated at the electron wiggling path interact at the right phase with the electron beam. In such a precise system, small (>0.01%) radiation-induced alterations of the magnetic field in the permanent magnets could affect FEL performance. This paper describes the simulation studies of radiation fields in permanent magnets and the expected signal in the detectors. The transport of particles from the radiation sources (i.e. diagnostic insert) to the undulator magnets and to the beam loss monitors (BLM) was simulated with the intra nuclear cascade codes FLUKA and MARS15. In order to accurately reproduce the optics of LCLS, lattice capabilities and magnetic fields were enabled in FLUKA and betatron oscillations were validated against reference data. All electron events entering the BLMs were printed in data files. The paper also introduces the Radioactive Ion Beam Optimizer (RIBO) Monte Carlo 3-D code, which was used to read from the event files, to compute Cerenkov production and then to simulate the optical coupling of the BLM detectors, accounting for the transmission of light through the quartz.

  19. Scoping Period Closed

    Broader source: Energy.gov [DOE]

    The environmental impact statement (EIS) scoping period has ended. DOE is preparing a Draft EIS that will analyze and compare the potential environmental impacts of various alternative approaches...

  20. Genealogy of periodic trajectories

    SciTech Connect (OSTI)

    de Adguiar, M.A.M.; Maldta, C.P.; de Passos, E.J.V.

    1986-05-20

    The periodic solutions of non-integrable classical Hamiltonian systems with two degrees of freedom are numerically investigated. Curves of periodic families are given in plots of energy vs. period. Results are presented for this Hamiltonian: H = 1/2(p/sub x//sup 2/ + p/sub y//sup 2/) + 1/2 x/sup 2/ + 3/2 y/sup 2/ - x/sup 2/y + 1/12 x/sup 4/. Properties of the families of curves are pointed out. (LEW)

  1. Scoping Period Open

    Broader source: Energy.gov [DOE]

    DOE has published in the Federal Register a Notice of Intent to prepare an environmental impact statement (EIS), and the scoping period is open for public comment for at least 30 days. DOE requests...

  2. Holding Period Complete

    Broader source: Energy.gov [DOE]

    DOE has published a Final Environmental Impact Statement (EIS), and the 30-day waiting period has ended. DOE is preparing a Record of Decision to announce and explain its chosen project alternative...

  3. Comment Period Closed Explained

    Broader source: Energy.gov [DOE]

    The public comment period on the Draft Environmental Impact Statement (EIS) has ended, and DOE is preparing a Final EIS. The Final EIS will consider and respond to all timely public comments on the...

  4. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  5. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  6. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  7. Beamline 7.0.2

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

    7.0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  8. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  9. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  10. Beamline 7.0.2

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

    Beamline 7.0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  11. Beamline 7.0.2

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

    Beamline 7.0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  12. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  13. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  14. Beamline 7.0.2

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

    0.2 Print Surface and Materials Science, Spectromicroscopy Scientific disciplines: Correlated electron system, materials science Endstations: nanoARPES (nARPES) EmicroARPES (Branchline 7.0.2.1) GENERAL BEAMLINE INFORMATION Operational No Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range See endstation tables Monochromator See endstation tables Scientific disciplines Correlated electron system, materials science Website Beamline 7:

  15. Parc Periodical | Photosynthetic Antenna Research Center

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

    Parc Periodical Parc Periodical PARC Periodical | Volume 7, Issue 2 PARC Periodical | Volume 7, Issue 1 PARC Periodical | Volume 6, Issue 6 PARC Periodical | Volume 6, Issue 5 PARC...

  16. Shortest recurrence periods of novae

    SciTech Connect (OSTI)

    Kato, Mariko [Department of Astronomy, Keio University, Hiyoshi, Yokohama 223-8521 (Japan); Saio, Hideyuki [Astronomical Institute, Graduate School of Science, Tohoku University, Sendai 980-8578 (Japan); Hachisu, Izumi [Department of Earth Science and Astronomy, College of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902 (Japan); Nomoto, Ken'ichi, E-mail: mariko@educ.cc.keio.ac.jp [Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan)

    2014-10-01

    Stimulated by the recent discovery of the 1 yr recurrence period nova M31N 2008-12a, we examined the shortest recurrence periods of hydrogen shell flashes on mass-accreting white dwarfs (WDs). We discuss the mechanism that yields a finite minimum recurrence period for a given WD mass. Calculating the unstable flashes for various WD masses and mass accretion rates, we identified a shortest recurrence period of about two months for a non-rotating 1.38 M {sub ?} WD with a mass accretion rate of 3.6 10{sup 7} M {sub ?} yr{sup 1}. A 1 yr recurrence period is realized for very massive (? 1.3 M {sub ?}) WDs with very high accretion rates (? 1.5 10{sup 7} M {sub ?} yr{sup 1}). We revised our stability limit of hydrogen shell burning, which will be useful for binary evolution calculations toward Type Ia supernovae.

  17. Operation Periods: Single Column Model

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

    2 Fall 2002 Intensive Operation Periods: Single Column Model and Unmanned Aerospace Vehicle In an Intensive Operation Period (IOP) on November 3-23, 2002, researchers at the SGP CART site are collecting a detailed data set for use in improving the Single Column Model (SCM), a scaled- down climate model. The SCM represents one vertical column of air above Earth's surface and requires less computation time than a full-scale global climate model. Researchers first use the SCM to efficiently improve

  18. PARC Periodical | Photosynthetic Antenna Research Center

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

    PARC Periodical PARC Periodical August 30, 2016 PARC Periodical | Volume 7, Issue 6 VIEW ARTICLE HERE Read more about PARC Periodical | Volume 7, Issue 6 June 1, 2016 PARC Periodical | Volume 7, Issue 5 VIEW ARTICLE HERE Read more about PARC Periodical | Volume 7, Issue 5 March 1, 2016 PARC Periodical | Volume 7, Issue 4 VIEW ARTICLE HERE Read more about PARC Periodical | Volume 7, Issue 4 February 16, 2016 PARC Periodical | Volume 7, Issue 3 VIEW ARTICLE HERE Read more about PARC Periodical |

  19. Down hole periodic seismic generator

    DOE Patents [OSTI]

    Hardee, Harry C.; Hills, Richard G.; Striker, Richard P.

    1989-01-01

    A down hole periodic seismic generator system for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.

  20. Advanced downhole periodic seismic generator

    DOE Patents [OSTI]

    Hardee, Harry C.; Hills, Richard G.; Striker, Richard P.

    1991-07-16

    An advanced downhole periodic seismic generator system for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.

  1. Intensive Observation Period Projects Scheduled

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

    1 Intensive Observation Period Projects Scheduled Several IOP projects have been scheduled for the SGP CART site this spring. These projects either have already begun or will begin shortly. Radiosondes The RS-90 Transition IOP is currently under way. The RS-90 model radiosonde is gradually replacing the older RS-80 model. Radiosondes are instrument packages attached to and launched by weather balloons. The instruments measure atmospheric pressure, temperature, and relative humidity as the

  2. Periodic permanent magnet focused klystron

    DOE Patents [OSTI]

    Ferguson, Patrick; Read, Michael; Ives, R Lawrence

    2015-04-21

    A periodic permanent magnet (PPM) klystron has beam transport structures and RF cavity structures, each of which has permanent magnets placed substantially equidistant from a beam tunnel formed about the central axis, and which are also outside the extent of a cooling chamber. The RF cavity sections also have permanent magnets which are placed substantially equidistant from the beam tunnel, but which include an RF cavity coupling to the beam tunnel for enhancement of RF carried by an electron beam in the beam tunnel.

  3. Groundwater Periodic Monitoring Reports | Department of Energy

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

    Groundwater Periodic Monitoring Reports Groundwater Periodic Monitoring Reports Topic: David Rhodes DOE, Provided Information on the Watersheds at LANL and the Monitoring Schedule ...

  4. Property:Maximum Wave Height(m) at Wave Period(s) | Open Energy...

    Open Energy Info (EERE)

    at Wave Period(s) Jump to: navigation, search Property Name Maximum Wave Height(m) at Wave Period(s) Property Type String Pages using the property "Maximum Wave Height(m) at Wave...

  5. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  6. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  7. Beamline 6.0.2

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

    6.0.2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  8. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  9. Beamline 6.0.2

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

    0.2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  10. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  11. Beamline 6.0.2

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

    Beamline 6.0.2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode.

  12. Beamline 6.0.2

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

    Beamline 6.0.2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode.

  13. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  14. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  15. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  16. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  17. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  18. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  19. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  20. Beamline 8.0.1

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

    8.0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380,

  1. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  2. Beamline 8.0.1

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

    8.0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380,

  3. Beamline 8.0.1

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

    8.0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380,

  4. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  5. Beamline 8.0.1

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

    0.1 Beamline 8.0.1 Print Tuesday, 20 October 2009 08:51 Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250

  6. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  7. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  8. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  9. Beamline 6.0.2

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

    2 Print Ultrafast/Femtosecond Dynamics Soft X Ray Scientific disciplines: Chemical dynamics, materials science, surfaces, interfaces GENERAL BEAMLINE INFORMATION Operational Decommissioned. To reopen as energy science (AMBER) beamline. Source characteristics 3.5-cm period undulator (U3) Energy range 250 eV- 1.5 keV Monochromator White light and VLS-PGM, with two gratings (250 and 1000 lines/mm) Calculated fs flux (1.9 GeV, 400 mA) 10,000-100,000 photons/pulse in picosecond mode. 10,000 times

  10. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  11. Beamline 8.0.1

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

    0.1 Print Surface and materials science, iRIXS (previously SXF), open port Scientific disciplines: Green energy sciences, material sciences, nanosciences, surfaces sciences, correlated electron system Endstations: 8.0.1.1: iRIXS (previously SXF) 8.0.1.2: Open port 8.0.1.3: Wet-RIXS 8.0.1.5: Bio-NEXAFS GENERAL BEAMLINE INFORMATION Operational Yes Source characteristics 5-cm period undulator (U5) (first, third, and fifth harmonics) Energy range 80-1250 eV Monochromator SGM (gratings: 150, 380, 925

  12. SES Probationary Period | Department of Energy

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

    Probationary Period SES Probationary Period An individual's initial appointment as an SES career appointee becomes final only after the individual has served a 1-year probationary period as a career appointee. That employee's rating official must perform an assessment of the new SES's performance during the probationary period. After the one year the selecting official must certify that the appointee performed at the level of excellence expected of a senior executive during the probationary

  13. A highly specific test for periodicity

    SciTech Connect (OSTI)

    Ansmann, Gerrit

    2015-11-15

    We present a method that allows to distinguish between nearly periodic and strictly periodic time series. To this purpose, we employ a conservative criterion for periodicity, namely, that the time series can be interpolated by a periodic function whose local extrema are also present in the time series. Our method is intended for the analysis of time series generated by deterministic time-continuous dynamical systems, where it can help telling periodic dynamics from chaotic or transient ones. We empirically investigate our method's performance and compare it to an approach based on marker events (or Poincaré sections). We demonstrate that our method is capable of detecting small deviations from periodicity and outperforms the marker-event-based approach in typical situations. Our method requires no adjustment of parameters to the individual time series, yields the period length with a precision that exceeds the sampling rate, and its runtime grows asymptotically linear with the length of the time series.

  14. Seismic isolation of two dimensional periodic foundations

    SciTech Connect (OSTI)

    Yan, Y.; Mo, Y. L.; Laskar, A.; Cheng, Z.; Shi, Z.; Menq, F.; Tang, Y.

    2014-07-28

    Phononic crystal is now used to control acoustic waves. When the crystal goes to a larger scale, it is called periodic structure. The band gaps of the periodic structure can be reduced to range from 0.5?Hz to 50?Hz. Therefore, the periodic structure has potential applications in seismic wave reflection. In civil engineering, the periodic structure can be served as the foundation of upper structure. This type of foundation consisting of periodic structure is called periodic foundation. When the frequency of seismic waves falls into the band gaps of the periodic foundation, the seismic wave can be blocked. Field experiments of a scaled two dimensional (2D) periodic foundation with an upper structure were conducted to verify the band gap effects. Test results showed the 2D periodic foundation can effectively reduce the response of the upper structure for excitations with frequencies within the frequency band gaps. When the experimental and the finite element analysis results are compared, they agree well with each other, indicating that 2D periodic foundation is a feasible way of reducing seismic vibrations.

  15. PARC Periodical | Vol. 6, Issue 4 | Photosynthetic Antenna Research Center

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

    PARC Periodical | Vol. 6, Issue 4 April 6, 2015 PARC Periodical | Vol. 6, Issue 4 VIEW PERIODICAL HERE

  16. Do triatomic molecules echo atomic periodicity?

    SciTech Connect (OSTI)

    Hefferlin, R. Barrow, J.

    2015-03-30

    Demonstrations of periodicity among triatomic-molecular spectroscopic constants underscore the role of the periodic law as a foundation of chemistry. The objective of this work is to prepare for another test using vibration frequencies ?{sub 1} of free, ground-state, main-group triatomic molecules. Using data from four data bases and from computation, we have collected ?{sub 1} data for molecules formed from second period atoms.

  17. PARC Periodical | Vol. 6, Issue 2 | Photosynthetic Antenna Research Center

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

    Vol. 6, Issue 2 December 1, 2014 PARC Periodical | Vol. 6, Issue 2 View Periodical Here

  18. PARC Periodical | Vol. 6, Issue 3 | Photosynthetic Antenna Research Center

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

    Vol. 6, Issue 3 February 9, 2015 PARC Periodical | Vol. 6, Issue 3 View Periodical Here

  19. Mo Year Report Period: EIA ID NUMBER:

    U.S. Energy Information Administration (EIA) Indexed Site

    Mo Year Report Period: EIA ID NUMBER: http:www.eia.govsurveyformeia14instructions.pdf Mailing Address: Secure File Transfer option available at: (e.g., PO Box, RR) https:...

  20. Total Estimated Contract Cost: Performance Period

    Office of Environmental Management (EM)

    FY2012 Fee Information Minimum Fee Maximum Fee September 2015 Contract Number: Cost Plus Incentive Fee Contractor: 3,264,909,094 Contract Period: EM Contractor Fee s Idaho...

  1. Long-period solar-terrestrial variability

    SciTech Connect (OSTI)

    Sonett, C.P. )

    1991-01-01

    Studies aimed at extending the record of solar-terrestrial variability to longer periods are discussed in a critical review of US research from the period 1987--1990. Sections are devoted to the sunspot index, radioactive carbon studies, a potential climate connection between radiocarbon changes and the solar irradiance cycle, Be-10 studies, geological laminae, solar neutrino counts, and the construction of data sets. Also included is a selective bibliography. 66 refs.

  2. Scheduled Maintenance Periods | Argonne National Laboratory

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

    Scheduled Maintenance Periods The CNM holds three maintenance periods per year. During these times certain CNM facilities may not be available for user activities. The Sector 26 beamline will not be available, the High-Performance Computing Cluster and nanofabrication facilities often are not available, and other facilities may undergo maintenance for only one or two days. Please contact your CNM Scientific Contact prior to arrival and plan your work visits and schedules accordingly. To better

  3. Transverse Gradient Undulator Huang, Zhirong; Ding, Yuantao;...

    Office of Scientific and Technical Information (OSTI)

    B.; LBL, Berkeley 43 PARTICLE ACCELERATORS; ACCELERATORS; ELECTRON BEAMS; ELECTRONS; FREE ELECTRON LASERS; LASERS; PERFORMANCE; PLASMA GUNS; RADIATIONS; WIGGLER MAGNETS...

  4. THE CATALINA SURVEYS PERIODIC VARIABLE STAR CATALOG

    SciTech Connect (OSTI)

    Drake, A. J.; Graham, M. J.; Djorgovski, S. G.; Mahabal, A. A.; Donalek, C.; Williams, R.; Catelan, M.; Torrealba, G.; García-Álvarez, D.; Prieto, J. L.; Beshore, E.; Larson, S.; Christen sen, E.; Boattini, A.; Gibbs, A.; Hill, R.; Kowalski, R.; Johnson, J.; Belokurov, V.; Koposov, S. E.; and others

    2014-07-01

    We present ∼47,000 periodic variables found during the analysis of 5.4 million variable star candidates within a 20,000 deg{sup 2} region covered by the Catalina Surveys Data Release-1 (CSDR1). Combining these variables with type ab RR Lyrae from our previous work, we produce an online catalog containing periods, amplitudes, and classifications for ∼61,000 periodic variables. By cross-matching these variables with those from prior surveys, we find that >90% of the ∼8000 known periodic variables in the survey region are recovered. For these sources, we find excellent agreement between our catalog and prior values of luminosity, period, and amplitude as well as classification. We investigate the rate of confusion between objects classified as contact binaries and type c RR Lyrae (RRc's) based on periods, colors, amplitudes, metallicities, radial velocities, and surface gravities. We find that no more than a few percent of the variables in these classes are misidentified. By deriving distances for this clean sample of ∼5500 RRc's, we trace the path of the Sagittarius tidal streams within the Galactic halo. Selecting 146 outer-halo RRc's with SDSS radial velocities, we confirm the presence of a coherent halo structure that is inconsistent with current N-body simulations of the Sagittarius tidal stream. We also find numerous long-period variables that are very likely associated within the Sagittarius tidal stream system. Based on the examination of 31,000 contact binary light curves we find evidence for two subgroups exhibiting irregular light curves. One subgroup presents significant variations in mean brightness that are likely due to chromospheric activity. The other subgroup shows stable modulations over more than a thousand days and thereby provides evidence that the O'Connell effect is not due to stellar spots.

  5. Periodic subsystem density-functional theory

    SciTech Connect (OSTI)

    Genova, Alessandro; Pavanello, Michele; Ceresoli, Davide

    2014-11-07

    By partitioning the electron density into subsystem contributions, the Frozen Density Embedding (FDE) formulation of subsystem Density Functional Theory (DFT) has recently emerged as a powerful tool for reducing the computational scaling of Kohn–Sham DFT. To date, however, FDE has been employed to molecular systems only. Periodic systems, such as metals, semiconductors, and other crystalline solids have been outside the applicability of FDE, mostly because of the lack of a periodic FDE implementation. To fill this gap, in this work we aim at extending FDE to treat subsystems of molecular and periodic character. This goal is achieved by a dual approach. On one side, the development of a theoretical framework for periodic subsystem DFT. On the other, the realization of the method into a parallel computer code. We find that periodic FDE is capable of reproducing total electron densities and (to a lesser extent) also interaction energies of molecular systems weakly interacting with metallic surfaces. In the pilot calculations considered, we find that FDE fails in those cases where there is appreciable density overlap between the subsystems. Conversely, we find FDE to be in semiquantitative agreement with Kohn–Sham DFT when the inter-subsystem density overlap is low. We also conclude that to make FDE a suitable method for describing molecular adsorption at surfaces, kinetic energy density functionals that go beyond the GGA level must be employed.

  6. Magnetomechanically induced long period fiber gratings

    SciTech Connect (OSTI)

    Causado-Buelvas, Jesus D.; Gomez-Cardona, Nelson D.; Torres, Pedro

    2008-04-15

    In this work, we report a simple, flexible method to create long period fiber gratings mechanically by controlling the repulsion/attraction force between two magnets that pressing a plate with a periodic array of small glass cylinders to a short length of optical fiber. Via the photoelastic effect, the pressure points induce the required periodic refractive index modulation to create the LPFG. We found that the induced device exhibits spectral characteristics similar to those of other types of LPFG. As the optical properties of LPFGs are directly related to the nature of the applied perturbations, we show, to our knowledge for the frrst time, how is the evolution of birefringence effects in mechanically induced LPFGs.

  7. Off-site Intensive Operational Period

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

    2 ARM Participating in Off-site Intensive Operational Period The ARM Program is playing a role in the Cirrus Regional Study of Tropical Anvils and Cirrus Layers-Florida Area Cirrus Experiment (CRYSTAL-FACE) intensive operational period (IOP), under way through July in South Florida. The objective of CRYSTAL-FACE is to investigate the physical properties and formation processes of tropical cirrus clouds. The ARM Program has deployed a suite of ground-based instruments in Florida for CRYSTAL-FACE

  8. Contract Periods of Performance Exceeding 5 Years

    Office of Energy Efficiency and Renewable Energy (EERE)

    Acquisition Letter 2010-5 has been revised to update references, make minor editorial changes, and clarify that the Director, Field Assistance and Oversight Division is the approval authority within Department of Energy for acquisition plans that contemplate a period of performance greater than 5 years.

  9. Quantum transport calculations using periodic boundaryconditions

    SciTech Connect (OSTI)

    Wang, Lin-Wang

    2004-06-15

    An efficient new method is presented to calculate the quantum transports using periodic boundary conditions. This method allows the use of conventional ground state ab initio programs without big changes. The computational effort is only a few times of a normal groundstate calculations, thus is makes accurate quantum transport calculations for large systems possible.

  10. Performance Period Total Fee Paid FY2008

    Office of Environmental Management (EM)

    1,339,286 FY 2012 38,126 FY 2013 42,265 Cumulative Fee Paid 1,766,600 42,265 Cost Plus Incentive FeeCost Plus Fixed Fee 36,602,425 Contract Period: September 2007 -...

  11. SEMIREGULAR VARIABLES WITH PERIODS LYING BETWEEN THE PERIOD-LUMINOSITY SEQUENCES C', C, AND D

    SciTech Connect (OSTI)

    Soszynski, I.; Wood, P. R. E-mail: wood@mso.anu.edu.au

    2013-02-15

    We analyze the distribution of semiregular variables and Mira stars in the period-luminosity plane. Our sample consists of 6169 oxygen-rich long-period variables in the Large Magellanic Cloud included in the OGLE-III Catalog of Variable Stars. There are many stars with periods that lie between the well-known sequences C and C'. Most of these stars are multi-periodic and the period ratios suggest that these stars oscillate in the same mode as the sequence C stars. Models suggest that this mode is the fundamental radial pulsation mode. The stars with primary periods between sequences C and C' preferentially lie on an additional sequence (named F), and a large fraction of these stars also have long secondary periods (LSPs) that lie between sequences C and D. There are also a small number of stars with primary periods lying between sequences C and D. The origin of this long-period variability is unknown, as is the cause of sequence D variability. In addition, the origin of sequence F is unknown but we speculate that sequence F variability may be excited by the same phenomenon that causes the LSPs.

  12. Periodically distributed objects with quasicrystalline diffraction pattern

    SciTech Connect (OSTI)

    Wolny, Janusz Strzalka, Radoslaw; Kuczera, Pawel

    2015-03-30

    It is possible to construct fully periodically distributed objects with a diffraction pattern identical to the one obtained for quasicrystals. These objects are probability distributions of distances obtained in the statistical approach to aperiodic structures distributed periodically. The diffraction patterns have been derived by using a two-mode Fourier transform—a very powerful method not used in classical crystallography. It is shown that if scaling is present in the structure, this two-mode Fourier transform can be reduced to a regular Fourier transform with appropriately rescaled scattering vectors and added phases. Detailed case studies for model sets 1D Fibonacci chain and 2D Penrose tiling are discussed. Finally, it is shown that crystalline, quasicrystalline, and approximant structures can be treated in the same way.

  13. DOE'S geothermal division: A period of transition

    SciTech Connect (OSTI)

    Jelacic, Allan J.; Reed, Marshall

    1996-01-24

    The transition that the Department of Energy's geothemal research program is undergoing is discussed. This transitional period began last year and will continue at least through final implementation of the Department's reorganization and downsizing. Current and recently completed R&D programs are reviewed. New initiatives are outlined. The foci and direction of the Division's activities of particular interest to the geothermal research community are addressed.

  14. Pulsation modes of long-period variables in the period-luminosity plane

    SciTech Connect (OSTI)

    Soszyński, I.; Udalski, A.; Wood, P. R. E-mail: udalski@astrouw.edu.pl

    2013-12-20

    We present a phenomenological analysis of long-period variables (LPVs) in the Large Magellanic Cloud with the aim of detecting pulsation modes associated with different period-luminosity (PL) relations. Among brighter LPVs, we discover a group of triple-mode semi-regular variables with the fundamental, first-overtone, and second-overtone modes simultaneously excited, which fall on PL sequences C, C', and B, respectively. The mode identification in the fainter red giants is more complicated. We demonstrate that the fundamental-mode pulsators partly overlap with the first-overtone modes. We show a possible range of fundamental mode and first overtone periods in the PL diagram.

  15. Down-hole periodic seismic generator

    DOE Patents [OSTI]

    Hardee, H.C.; Hills, R.G.; Striker, R.P.

    1982-10-28

    A down hole periodic seismic generator system is disclosed for transmitting variable frequency, predominantly shear-wave vibration into earth strata surrounding a borehole. The system comprises a unitary housing operably connected to a well head by support and electrical cabling and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a variable speed pneumatic oscillator and a self-contained pneumatic reservoir for producing a frequency-swept seismic output over a discrete frequency range.

  16. Property:Building/EndPeriod | Open Energy Information

    Open Energy Info (EERE)

    EndPeriod Jump to: navigation, search This is a property of type Date. End of the period (last day of the month) Pages using the property "BuildingEndPeriod" Showing 25 pages...

  17. Negative Effective Gravity in Water Waves by Periodic Resonator...

    Office of Scientific and Technical Information (OSTI)

    Negative Effective Gravity in Water Waves by Periodic Resonator Arrays Prev Next Title: Negative Effective Gravity in Water Waves by Periodic Resonator Arrays Authors: Hu,...

  18. Periodic Trends in Highly Dispersed Groups IV and V Supported...

    Office of Scientific and Technical Information (OSTI)

    Periodic Trends in Highly Dispersed Groups IV and V Supported Metal Oxide Catalysts for ... Title: Periodic Trends in Highly Dispersed Groups IV and V Supported Metal Oxide Catalysts ...

  19. EIS-0374: Notice of Extension of Comment Period | Department...

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

    of Comment Period EIS-0374: Notice of Extension of Comment Period Klondike IIIBiglow Canyon Wind Integration Project This notice extends the close of comment for scoping from the...

  20. Nanoscale Periodic Modulations on Sodium Chloride Induced by...

    Office of Scientific and Technical Information (OSTI)

    Journal Article: Nanoscale Periodic Modulations on Sodium Chloride Induced by Surface Charges Citation Details In-Document Search Title: Nanoscale Periodic Modulations on Sodium ...

  1. High Pressure Fuel Storage Cylinders Periodic Inspection and...

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

    Fuel Storage Cylinders Periodic Inspection and End of Life Issues High Pressure Fuel Storage Cylinders Periodic Inspection and End of Life Issues These slides were presented at the ...

  2. Logic elements for reactor period meter

    DOE Patents [OSTI]

    McDowell, William P.; Bobis, James P.

    1976-01-01

    Logic elements are provided for a reactor period meter trip circuit. For one element, first and second inputs are applied to first and second chopper comparators, respectively. The output of each comparator is O if the input applied to it is greater than or equal to a trip level associated with each input and each output is a square wave of frequency f if the input applied to it is less than the associated trip level. The outputs of the comparators are algebraically summed and applied to a bandpass filter tuned to f. For another element, the output of each comparator is applied to a bandpass filter which is tuned to f to give a sine wave of frequency f. The outputs of the filters are multiplied by an analog multiplier whose output is 0 if either input is 0 and a sine wave of frequency 2f if both inputs are a frequency f.

  3. PARC Periodical | Volume 6, Issue 6 | Photosynthetic Antenna Research

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

    Center 6, Issue 6 August 20, 2015 PARC Periodical | Volume 6, Issue 6

  4. PARC Periodical | Volume 7, Issue 1 | Photosynthetic Antenna Research

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

    Center 7, Issue 1 October 12, 2015 PARC Periodical | Volume 7, Issue 1

  5. PARC Periodical | Volume 7, Issue 2 | Photosynthetic Antenna Research

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

    Center 2 December 7, 2015 PARC Periodical | Volume 7, Issue 2 VIEW ARTICLE HERE

  6. PARC Periodical | Volume 7, Issue 3 | Photosynthetic Antenna Research

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

    Center 3 February 16, 2016 PARC Periodical | Volume 7, Issue 3 VIEW ARTICLE HERE

  7. Property:Wave Period Range(s) | Open Energy Information

    Open Energy Info (EERE)

    Property Edit with form History Property:Wave Period Range(s) Jump to: navigation, search Property Name Wave Period Range(s) Property Type String Pages using the property "Wave...

  8. Periods of Congestion in Quark Cafe During Lunch Service: June...

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

    Periods of Congestion in Quark Cafe During Lunch Service: June 15-17 Periods of Congestion in Quark Cafe During Lunch Service: June 15-17 Quark Cafe may experience intermittent ...

  9. Property:Building/StartPeriod | Open Energy Information

    Open Energy Info (EERE)

    to: navigation, search This is a property of type Date. Start of the period (first day o the month) Pages using the property "BuildingStartPeriod" Showing 25 pages using this...

  10. EIS-0431: Extension of public comment period; Notice of public...

    Energy Savers [EERE]

    Notice of public hearing (Correction) Hydrogen Energy California's Integrated ... Period and Public Hearing for the Hydrogen Energy California's Integrated ...

  11. EIS-0431: Extension of Public Comment Period | Department of Energy

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

    Public Comment Period EIS-0431: Extension of Public Comment Period Hydrogen Energy California's Integrated Gasification Combined Cycle and Carbon Capture and Sequestration Project, CA The U.S. Department of Energy (DOE) published a notice of availability on July 22, 2013 (78 FR 43870) that provided for a comment period ending September 3, 2013. DOE is extending the public comment period to October 1, 2013, and announces public hearings for the Hydrogen Energy California's Integrated Gasification

  12. PARC Periodical | Volume 6, Issue 5 | Photosynthetic Antenna Research

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

    Center Volume 6, Issue 5 June 3, 2015 PARC Periodical | Volume 6, Issue 5 VIEW ARTICLE HERE

  13. Recommendation 186: Option Periods in Prime Contract Language

    Broader source: Energy.gov [DOE]

    The inclusion of option periods in the language of all future DOE Request for Proposals for prime contracts when appropriate.

  14. PARC Periodical | Volume 7, Issue 4 | Photosynthetic Antenna Research

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

    Center PARC Periodical | Volume 7, Issue 4 March 1, 2016 PARC Periodical | Volume 7, Issue 4 VIEW ARTICLE HERE http://us6.campaign-archive1.com/?u=8d1be2560b66e88d2fd6e4351&id=53703d9619&e=7d... News/Media PARC Periodical

  15. THEORETICAL CEPHEID PERIOD-LUMINOSITY AND PERIOD-COLOR RELATIONS IN SPITZER IRAC BANDS

    SciTech Connect (OSTI)

    Ngeow, Chow-Choong; Marconi, Marcella; Musella, Ilaria; Cignoni, Michele; Kanbur, Shashsi M.

    2012-02-01

    In this paper, the synthetic period-luminosity (P-L) relations in Spitzer's IRAC bands, based on a series of theoretical pulsation models with varying metal and helium abundance, were investigated. Selected sets of these synthetic P-L relations were compared to the empirical IRAC band P-L relations recently determined from Galactic and Magellanic Clouds Cepheids. For the Galactic case, synthetic P-L relations from model sets with (Y = 0.26, Z = 0.01), (Y = 0.26, Z = 0.02), and (Y = 0.28, Z = 0.02) agree with the empirical Galactic P-L relations derived from the Hubble Space Telescope parallaxes. For Magellanic Cloud Cepheids, the synthetic P-L relations from model sets with (Y = 0.25, Z = 0.008) agree with both of the empirical Large Magellanic Cloud (LMC) and Small Magellanic Cloud P-L relations. Analysis of the synthetic P-L relations from all model sets suggested that the IRAC band P-L relations may not be independent of metallicity, as the P-L slopes and intercepts could be affected by the metallicity and/or helium abundance. We also derive the synthetic period-color (P-C) relations in the IRAC bands. Non-vanishing synthetic P-C relations were found for certain combinations of IRAC band filters and metallicity. However, the synthetic P-C relations disagreed with the [3.6]-[8.0] P-C relation recently found for the Galactic Cepheids. The synthetic [3.6]-[4.5] P-C slope from the (Y = 0.25, Z = 0.008) model set, on the other hand, is in excellent agreement to the empirical LMC P-C counterpart, if a period range 1.0 < log (P) < 1.8 is adopted.

  16. Total Estimated Contract Price: Contract Option Periods: Performance

    Office of Environmental Management (EM)

    Price: Contract Option Periods: Performance Period Fee Earned Base Period "A" $0 Base Period "B" Option 1 Option 2 Option 3 Cumulative Fee $0 EM Contractor Fee June 2015 Site: Office of River Protection, Richland, WA Contract Name: Hanford 222-S Laboratory Analysis and Testing Services Contractor: Wastren Advantage, Inc Contract Number: DE-EM0003722 Contract Type: Hybrid Contract with Award Fee Fee Available $44,562,457 Base Contract Period: November 21, 2016 to September 20,

  17. Periodicals collection management using a decision support system

    SciTech Connect (OSTI)

    Compton, M.L.; Moser, E.C.

    1993-12-31

    Sandia National Laboratories is a multiprogram national laboratory established in 1949. The Library currently uses DOBIS for its automated system, including the Periodicals Control function for periodical check-in. DOBIS performs processing and control functions adequately, but could not meet our reporting needs. Therefore the Library`s Periodicals Decision Team decided that they needed another ``system`` for collection management. A Periodicals Decision Support System was created using information downloaded from DOBIS and uploaded into dBASE IV. The Periodical Decision Support System functions as an information-processing system that has aided us in making collection management decisions for periodicals. It certainly allows us to do interactive ad-hoc analysis; although there are no modeling tools currently incorporated in the system. We hope that these modeling tools will come later. We have been gathering information and developing needed reports to achieve this goal.

  18. PARC Periodical | Volume 7, Issue 6 | Photosynthetic Antenna Research

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

    Center PARC Periodical | Volume 7, Issue 6 August 30, 2016 PARC Periodical | Volume 7, Issue 6 VIEW ARTICLE HERE http://us6.campaign-archive1.com/?u=8d1be2560b66e88d2fd6e4351&id=03b6c7eb11&e=41... News/Media PARC Periodical

  19. EIS-0489: Notice of Comment Period Extension and Additional Scoping...

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

    FERC announces the extension of the public comment periond and additional scoping meetings. The comment period has been extended from September 4, 2012 to October 29, 2012. For ...

  20. EIS-0463: Extension of Scoping Period | Department of Energy

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

    Transmission LLC: Public Scoping Period Reopened: Federal Register Volume 73, No. 183 - Jun. 15, 2011 EIS-0463: Notice of Intent to Prepare a Supplement to the Draft Environmental...

  1. EIS-0403: Notice to Extend Public Comment Period | Department...

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

    States The Department of Energy and the Bureau of Land Management (BLM) (the Agencies) extended the public comment period for the Programmatic Environmental Impact Statement to...

  2. Notice of Extension of Public Comment Period for Application...

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

    Extension of Public Comment Period for Application for Proposed Project for Clean Line Plains & Eastern Transmission Line: Federal Register Notice, Volume 80, No. 116 - Jun. 17, ...

  3. Department of Energy Extends Public Comment Period | Department...

    Office of Environmental Management (EM)

    Administration Nevada Site Office is extending the public comment period for the Draft Site-Wide Environmental Impact Statement (SWEIS) for the Nevada National Security ...

  4. Extension of Comment Period on the Draft Integrated, Interagency...

    Energy Savers [EERE]

    of Comment Period on the Draft Integrated, Interagency Pre-Application (IIP) Process for Electric Transmission Projects Requiring Federal Authorizations Extension of Comment...

  5. ARM Intensive Operational Period Scheduled to Validate New NASA...

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

    ARM Intensive Operational Period Scheduled to Validate New NASA Satellite Beginning in ... On May 4, the National Aeronautics and Space Administration (NASA) launched Aqua, the ...

  6. EIS-0391: Extension of the Public Comment Period | Department...

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

    Tank Closure and Waste Management for the Hanford Site, Richland, WA Extension of the Public Comment Period for the Draft Tank Closure and Waste Management Environmental Impact...

  7. "Period","Annual Production Capacity",,"Monthly B100 Production...

    U.S. Energy Information Administration (EIA) Indexed Site

    Biodiesel production capacity and production" "million gallons" "Period","Annual ... is the industry designation for pure biodiesel; a biodiesel blend contains both pure ...

  8. CEQ Extends Comment Period on Revised Draft Guidance on Consideration...

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

    of Greenhouse Gas Emissions and the Effects of Climate Change in NEPA Reviews CEQ Extends Comment Period on Revised Draft Guidance on Consideration of Greenhouse Gas ...

  9. Quantum coherent switch utilizing commensurate nanoelectrode and charge density periodicities

    DOE Patents [OSTI]

    Harrison, Neil; Singleton, John; Migliori, Albert

    2008-08-05

    A quantum coherent switch having a substrate formed from a density wave (DW) material capable of having a periodic electron density modulation or spin density modulation, a dielectric layer formed onto a surface of the substrate that is orthogonal to an intrinsic wave vector of the DW material; and structure for applying an external spatially periodic electrostatic potential over the dielectric layer.

  10. Period-doubling reconstructions of semiconductor partial dislocations

    SciTech Connect (OSTI)

    Park, Ji -Sang; Huang, Bing; Wei, Su -Huai; Kang, Joongoo; McMahon, William E.

    2015-09-18

    Atomic-scale understanding and control of dislocation cores is of great technological importance, because they act as recombination centers for charge carriers in optoelectronic devices. Using hybrid density-functional calculations, we present period-doubling reconstructions of a 90° partial dislocation in GaAs, for which the periodicity of like-atom dimers along the dislocation line varies from one to two, to four dimers. The electronic properties of a dislocation change drastically with each period doubling. The dimers in the single-period dislocation are able to interact, to form a dispersive one-dimensional band with deep-gap states. However, the inter-dimer interaction for the double-period dislocation becomes significantly reduced; hence, it is free of mid-gap states. The Ga core undergoes a further period-doubling transition to a quadruple-period reconstruction induced by the formation of small hole polarons. Lastly, the competition between these dislocation phases suggests a new passivation strategy via population manipulation of the detrimental single-period phase.

  11. Period-doubling reconstructions of semiconductor partial dislocations

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Park, Ji -Sang; Huang, Bing; Wei, Su -Huai; Kang, Joongoo; McMahon, William E.

    2015-09-18

    Atomic-scale understanding and control of dislocation cores is of great technological importance, because they act as recombination centers for charge carriers in optoelectronic devices. Using hybrid density-functional calculations, we present period-doubling reconstructions of a 90° partial dislocation in GaAs, for which the periodicity of like-atom dimers along the dislocation line varies from one to two, to four dimers. The electronic properties of a dislocation change drastically with each period doubling. The dimers in the single-period dislocation are able to interact, to form a dispersive one-dimensional band with deep-gap states. However, the inter-dimer interaction for the double-period dislocation becomes significantly reduced;more » hence, it is free of mid-gap states. The Ga core undergoes a further period-doubling transition to a quadruple-period reconstruction induced by the formation of small hole polarons. Lastly, the competition between these dislocation phases suggests a new passivation strategy via population manipulation of the detrimental single-period phase.« less

  12. Development of Seismic Isolation Systems Using Periodic Materials

    SciTech Connect (OSTI)

    Yan, Yiqun; Mo, Yi-Lung; Menq, Farn-Yuh; Stokoe, II, Kenneth H.; Perkins, Judy; Tang, Yu

    2014-12-10

    Advanced fast nuclear power plants and small modular fast reactors are composed of thin-walled structures such as pipes; as a result, they do not have sufficient inherent strength to resist seismic loads. Seismic isolation, therefore, is an effective solution for mitigating earthquake hazards for these types of structures. Base isolation, on which numerous studies have been conducted, is a well-defined structure protection system against earthquakes. In conventional isolators, such as high-damping rubber bearings, lead-rubber bearings, and friction pendulum bearings, large relative displacements occur between upper structures and foundations. Only isolation in a horizontal direction is provided; these features are not desirable for the piping systems. The concept of periodic materials, based on the theory of solid-state physics, can be applied to earthquake engineering. The periodic material is a material that possesses distinct characteristics that prevent waves with certain frequencies from being transmitted through it; therefore, this material can be used in structural foundations to block unwanted seismic waves with certain frequencies. The frequency band of periodic material that can filter out waves is called the band gap, and the structural foundation made of periodic material is referred to as the periodic foundation. The design of a nuclear power plant, therefore, can be unified around the desirable feature of a periodic foundation, while the continuous maintenance of the structure is not needed. In this research project, three different types of periodic foundations were studied: one-dimensional, two-dimensional, and three-dimensional. The basic theories of periodic foundations are introduced first to find the band gaps; then the finite element methods are used, to perform parametric analysis, and obtain attenuation zones; finally, experimental programs are conducted, and the test data are analyzed to verify the theory. This procedure shows that the

  13. EIS-0463: Reopening of Scoping Period for the Environmental Impact...

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

    ends on June 14, 2011. For more information see the project page at: http:energy.govnode300109. Download Document EIS-0463: Reopening of Scoping Period for the Environmental...

  14. Award Fee Evaluation Period 5 Determination Scorecard Contractor...

    Office of Environmental Management (EM)

    5 Determination Scorecard Contractor: Fluor-BWXT Portsmouth LLC Contract: DE-AC30-10CC40017 Award Fee Evaluation Period: Fiscal Year 2015 (October 1, 2014 to September 30, 2015) ...

  15. Award Fee Evaluation Period 6 Determination Scorecard Contractor...

    Office of Environmental Management (EM)

    6 Determination Scorecard Contractor: Wastren-EnergX Mission Support, LLC Contract: DE-CI0000004 Award Fee Evaluation Period: Fiscal Year 2015 (October 1, 2014 to September 30, ...

  16. Linear Scaling Electronic Structure Methods with Periodic Boundary Conditions

    SciTech Connect (OSTI)

    Gustavo E. Scuseria

    2008-02-08

    The methodological development and computational implementation of linear scaling quantum chemistry methods for the accurate calculation of electronic structure and properties of periodic systems (solids, surfaces, and polymers) and their application to chemical problems of DOE relevance.

  17. Property:Building/MeanAnnualTempCalculationPeriod | Open Energy...

    Open Energy Info (EERE)

    Property Edit with form History Property:BuildingMeanAnnualTempCalculationPeriod Jump to: navigation, search This is a property of type Number. Mean annual temperature during the...

  18. Progress report for the period October 1981-September 1982

    SciTech Connect (OSTI)

    Not Available

    1983-02-01

    The mission-related activities of the DOE New Brunswick Laboratory involving development, calibration, and evaluation of nuclear material measurement technology and providing measurement-related services for the Government during the period are described and summarized.

  19. Notice of extension of public comment period for reply comments...

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

    Notice of extension of public comment period for reply comments. On July 27, 2010, the ... incidents.The NOI provided a September 27, 2010, deadline for comments, which was ...

  20. Extension of Comment Period on Improving Performance of Federal Permitting

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

    and Review of Infrastructure Projects: Federal Register Notice Volume 78, No. 186 - September 25, 2013 | Department of Energy Extension of Comment Period on Improving Performance of Federal Permitting and Review of Infrastructure Projects: Federal Register Notice Volume 78, No. 186 - September 25, 2013 Extension of Comment Period on Improving Performance of Federal Permitting and Review of Infrastructure Projects: Federal Register Notice Volume 78, No. 186 - September 25, 2013 On August 29,

  1. DOE Extends Public Comment Period for Uranium Program Environmental Impact

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

    Statement | Department of Energy Uranium Program Environmental Impact Statement DOE Extends Public Comment Period for Uranium Program Environmental Impact Statement April 18, 2013 - 1:08pm Addthis Contractor, Bob Darr, S.M. Stoller Corporation Public Affairs, (720) 377-9672, ULinfo@lm.doe.gov GRAND JUNCTION, Colo. - The U.S. Department of Energy (DOE) today announced that the public comment period for the Draft Uranium Leasing Program Programmatic Environmental Impact Statement (ULP PEIS)

  2. WASP-19b: THE SHORTEST PERIOD TRANSITING EXOPLANET YET DISCOVERED

    SciTech Connect (OSTI)

    Hebb, L.; Collier-Cameron, A.; Enoch, B.; Horne, K.; Triaud, A.H.M.J.; Gillon, M.; Queloz, D.; Mayor, M.; Pepe, F.; Segransan, D.; Lister, T.A.; Smalley, B.; Maxted, P.F.L.; Hellier, C.; Anderson, D.R.; Bentley, S.; Pollacco, D.; West, R.G.; Haswell, C.A.; Skillen, I.

    2010-01-01

    We report on the discovery of a new extremely short period transiting extrasolar planet, WASP-19b. The planet has mass M{sub pl} = 1.15 +- 0.08 M{sub J} , radius R{sub pl} = 1.31 +- 0.06 R{sub J} , and orbital period P = 0.7888399 +- 0.0000008 days. Through spectroscopic analysis, we determine the host star to be a slightly super-solar metallicity ([M/H] = 0.1 +- 0.1 dex) G-dwarf with T{sub eff} = 5500 +- 100 K. In addition, we detect periodic, sinusoidal flux variations in the light curve which are used to derive a rotation period for the star of P{sub rot} = 10.5 +- 0.2 days. The relatively short stellar rotation period suggests that either WASP-19 is somewhat young (approx 600 Myr old) or tidal interactions between the two bodies have caused the planet to spiral inward over its lifetime resulting in the spin-up of the star. Due to the detection of the rotation period, this system has the potential to place strong constraints on the stellar tidal quality factor, Q'{sub s}, if a more precise age is determined.

  3. Beamline 4.0.3

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

    spectroscopy (ARPES) GENERAL BEAMLINE INFORMATION Operational 2011 Source characteristics 9.0-cm-period quasiperiodic elliptical polarization undulator (EPU9) Energy range...

  4. Beamline 6.0.1

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

    1 Print Ultrafast Femtosecond Dynamics Hard X Ray GENERAL BEAMLINE INFORMATION Operational Yes, but not open to General Users Source characteristics 3-cm period undulator (U3)...

  5. EIS-0236-S4: Extension of Comment Period | Department of Energy

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

    Extension of Comment Period EIS-0236-S4: Extension of Comment Period Complex Transformation Extension of Comment Period for the Draft Complex Transformation Supplemental...

  6. Time-periodic solutions of the Benjamin-Ono equation

    SciTech Connect (OSTI)

    Ambrose , D.M.; Wilkening, Jon

    2008-04-01

    We present a spectrally accurate numerical method for finding non-trivial time-periodic solutions of non-linear partial differential equations. The method is based on minimizing a functional (of the initial condition and the period) that is positive unless the solution is periodic, in which case it is zero. We solve an adjoint PDE to compute the gradient of this functional with respect to the initial condition. We include additional terms in the functional to specify the free parameters, which, in the case of the Benjamin-Ono equation, are the mean, a spatial phase, a temporal phase and the real part of one of the Fourier modes at t = 0. We use our method to study global paths of non-trivial time-periodic solutions connecting stationary and traveling waves of the Benjamin-Ono equation. As a starting guess for each path, we compute periodic solutions of the linearized problem by solving an infinite dimensional eigenvalue problem in closed form. We then use our numerical method to continue these solutions beyond the realm of linear theory until another traveling wave is reached (or until the solution blows up). By experimentation with data fitting, we identify the analytical form of the solutions on the path connecting the one-hump stationary solution to the two-hump traveling wave. We then derive exact formulas for these solutions by explicitly solving the system of ODE's governing the evolution of solitons using the ansatz suggested by the numerical simulations.

  7. LONG-TERM PERIODICITY VARIATIONS OF THE SOLAR RADIUS

    SciTech Connect (OSTI)

    Qu, Z. N.; Xie, J. L.

    2013-01-01

    In order to study the long-term periodicity variations of the solar radius, daily solar radius data from 1978 February to 2000 September at the Calern Observatory are used. Continuous observations of the solar radius are difficult due to the weather, seasonal effects, and instrument characteristics. Thus, to analyze these data, we first use the Dixon criterion to reject suspect values, then we measure the cross-correlation between the solar radius and sunspot numbers. The result indicates that the solar radius is in complete antiphase with the sunspot numbers and shows lead times of 74 months relative to the sunspot numbers. The Lomb-Scargle and date compensated discrete Fourier transform methods are also used to investigate the periodicity of the solar radius. Both methods yield similar significance periodicities around {approx}1 yr, {approx}2.6 yr, {approx}3.6 yr, and {approx}11 yr. Possible mechanisms for these periods are discussed. The possible physical cause of the {approx}11 yr period is the cyclic variation of the magnetic pressure of the concentrated flux tubes at the bottom of the solar convection zone.

  8. Ultra-short period binaries from the Catalina Surveys

    SciTech Connect (OSTI)

    Drake, A. J.; Djorgovski, S. G.; Graham, M. J.; Mahabal, A. A.; Donalek, C.; Williams, R.; García-Álvarez, D.; Catelan, M.; Torrealba, G.; Prieto, J. L.; Abraham, S.; Larson, S.; Christensen, E.

    2014-08-01

    We investigate the properties of 367 ultra-short period binary candidates selected from 31,000 sources recently identified from Catalina Surveys data. Based on light curve morphology, along with WISE, Sloan Digital Sky Survey, and GALEX multi-color photometry, we identify two distinct groups of binaries with periods below the 0.22 day contact binary minimum. In contrast to most recent work, we spectroscopically confirm the existence of M dwarf+M dwarf contact binary systems. By measuring the radial velocity variations for five of the shortest-period systems, we find examples of rare cool white dwarf (WD)+M dwarf binaries. Only a few such systems are currently known. Unlike warmer WD systems, their UV flux and optical colors and spectra are dominated by the M-dwarf companion. We contrast our discoveries with previous photometrically selected ultra-short period contact binary candidates and highlight the ongoing need for confirmation using spectra and associated radial velocity measurements. Overall, our analysis increases the number of ultra-short period contact binary candidates by more than an order of magnitude.

  9. National Weatherization Assistance Program Characterization Describing the Recovery Act Period

    SciTech Connect (OSTI)

    Tonn, Bruce Edward; Rose, Erin M.; Hawkins, Beth A.

    2015-10-01

    This report characterizes the U.S. Department of Energy s Weatherization Assistance Program (WAP) during the American Recovery and Reinvestment Act of 2009 (Recovery Act) period. This research was one component of the Recovery Act evaluation of WAP. The report presents the results of surveys administered to Grantees (i.e., state weatherization offices) and Subgrantees (i.e., local weatherization agencies). The report also documents the ramp up and ramp down of weatherization production and direct employment during the Recovery Act period and other challenges faced by the Grantees and Subgrantees during this period. Program operations during the Recovery Act (Program Year 2010) are compared to operations during the year previous to the Recovery Act (Program Year 2008).

  10. Total Estimated Contract Cost: Performance Period Total Fee Paid

    Office of Environmental Management (EM)

    Performance Period Total Fee Paid FY2008 $134,832 FY2009 $142,578 FY2010 $299,878 FY2011 $169,878 Cumulative Fee Paid $747,166 Contract Period: September 2007 - October 2012 $31,885,815 C/P/E Environmental Services, LLC DE-AM09-05SR22405/DE-AT30-07CC60011/SL14 Contractor: Contract Number: Contract Type: Cost Plus Award Fee $357,223 $597,797 $894,699 EM Contractor Fee Site: Stanford Linear Accelerator Center (SLAC) Contract Name: SLAC Environmental Remediation December 2012 $1,516,646 Fee

  11. PARC Periodical | Volume 7, Issue 5 | Photosynthetic Antenna Research

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

    Center 5 June 1, 2016 PARC Periodical | Volume 7, Issue 5 VIEW ARTICLE HERE http://us6.campaign-archive1.com/?u=8d1be2560b66e88d2fd6e4351&id=d20f3cc561&e=7d...

  12. Knot Undulator to Generate Linearly Polarized Photons with Low...

    Office of Scientific and Technical Information (OSTI)

    pure linearly polarized photons in the third generation synchrotron radiation facilities. ... Sponsoring Org: USDOE Country of Publication: United States Language: English Subject: 43 ...

  13. Knot Undulator to Generate Linearly Polarized Photons with Low...

    Office of Scientific and Technical Information (OSTI)

    Heat load on beamline optics is a serious problem to generate pure linearly polarized ... Language: English Subject: 43 PARTICLE ACCELERATORS; OPTICS; PERMANENT MAGNETS; PHOTONS; ...

  14. Quasi-periodic quantum dot arrays produced by electrochemical synthesis

    SciTech Connect (OSTI)

    Bandyopadhyay, S.; Miller, A.E.; Yue, D.F.; Banerjee, G.; Ricker, R.E.; Jones, S.; Eastman, J.A.; Baugher, E.; Chandrasekhar, M.

    1994-06-01

    We discuss a ``gentle`` electrochemical technique for fabricating quasi-periodic quantum dot arrays. The technique exploits a self-organizing phenomenon to produce quasi-periodic arrangement of dots and provides excellent control over dot size and interdot spacing. Unlike conventional nanolithography, it does not cause radiation damage to the structures during exposure to pattern delineating beams (e-beam, ion-beam or x-ray). Moreover, it does not require harsh processing steps like reactive ion etching, offers a minimum feature size of {approximately}40 {angstrom}, allows the fabrication of structures on nonplanar surfaces (e.g. spherical or cylindrical substrates), is amenable to mass production (millions of wafers can be processed simultaneously) and is potentially orders of magnitude cheaper than conventional nanofabrication. In this paper, we describe our initial results and show the promise of this technique for low-cost and high-yield nanosynthesis.

  15. Enforcement Policy Statement: Compliance Period for Regional Standards

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

    Compliance Period for Regional Standards Applicable to Central Air Conditioners April 24, 2014 On June 27, 2011, the U.S. Department of Energy (DOE) published in the Federal Register a direct final rule (DFR) under the Energy Policy and Conservation Act (EPCA), 42 U.S.C. §§ 6291-6309, which set forth amended energy conservation standards for residential furnaces, central air conditioners, and heat pumps, including regional standards for different product types in indicated States. 76 FR 37408.

  16. Beyond periodic orbits: An example in nonhydrogenic atoms

    SciTech Connect (OSTI)

    Dando, P.A.; Monteiro, T.S.; Delande, D.; Taylor, K.T. (Department of Mathematics, Royal Holloway, University of London, Egham, Surrey, TW20 0EX (United Kingdom) Laboratoire Kastler-Brossel, Universite Pierre et Marie Curie, 4 place Jussieu, F-75005 Paris (France) Department of Applied Mathematics and Theoretical Physics, Queen's University Belfast, Belfast, BT7 1NN (United Kingdom))

    1995-02-13

    The spectrum of hydrogen in a magnetic field is a paradigm of quantum chaos and may be analyzed accurately by periodic-orbit-type theories. In nonhydrogenic atoms, the core induces pure quantum effects, especially additional spectral modulations, which cannot be analyzed reliably in terms of classical orbits and their stability parameters. Provided core-scattered waves are included consistently, core-scattered modulations as well as corrected amplitudes for primitive orbits are in excellent agreement with quantum results. We consider whether these systems correspond to quantum chaos.

  17. DURING THIS REPORTING PERIOD, WE ISSUED 39 REPORTS; IDENTIFIED

    Energy Savers [EERE]

    39 REPORTS; IDENTIFIED $12.6 MILLION IN FUNDS PUT TO BETTER USE AND $19.3 MILLION IN QUESTIONED COSTS; OBTAINED $6.2 MILLION IN FINES, SETTLEMENTS, AND RECOVERIES, 6 CRIMINAL CONVICTIONS, 20 SUSPENSIONS AND DEBARMENTS, AND 51 CIVIL AND ADMINISTRATIVE ACTIONS; AND RECEIVED 1,679 HOTLINE CONTACTS. DURING THIS REPORTING PERIOD, WE ISSUED 39 REPORTS; IDENTIFIED $12.6 MILLION IN FUNDS PUT TO BETTER US AND $19.3 MILLION IN QUESTIONED COSTS; OBTAINED $6.2 MILLION IN FINES, SETTLEMENTS, AND RECOVERIES,

  18. Budget Period 2 Summary Report Part 2: Hywind Maine Project

    SciTech Connect (OSTI)

    Driscoll, Frederick; Platt, Andrew; Sirnivas, Senu

    2015-08-15

    This project was performed under the Work for Others—Funds in Agreement FIA-14-1793 between Statoil and the Alliance for Sustainable Energy, manager and operator of the National Renewable Energy Laboratory (NREL). To support the development of a 6-MW spar-mounted offshore wind turbine, Statoil funded NREL to perform tasks in the following three categories: 1. Design and analysis 2. Wake modeling 3. Concept resource assessment. This study expands upon the work conducted in Budget Period 1 (BP1) to investigate the influence of the wake generated from an upstream turbine on a downstream turbine using Computational Fluid Dynamics (CFD) high-fidelity modeling tool. Simulator fOr Wind Farms Application (SOWFA) [1] is an NREL high fidelity modeling tool that couples OpenFOAM [2] CFD and NREL’s Aero-Elastic code Fatigue, Aerodynamics, Structures, and Turbulence (FAST)[3]. In BP1 the configuration was based on Hywind-3MW at 140 m water depth in the Gulf of Maine; however this study for Budget Period 2 (BP2) the configuration investigated is based on Hywind-6MW at 220 m water depth off the coast of Boston. The objectives were to perform two-turbines One-Way Coupling (OWC), three-turbines Two-Way Coupling (TWC), and to investigate wind power plant optimization.

  19. Short-period pulsar oscillations following a glitch

    SciTech Connect (OSTI)

    Van Eysden, C. A.

    2014-07-10

    Following a glitch, the crust and magnetized plasma in the outer core of a neutron star are believed to rapidly establish a state of co-rotation within a few seconds by process analogous to classical Ekman pumping. However, in ideal magnetohydrodynamics, a final state of co-rotation is inconsistent with conservation of energy of the system. We demonstrate that, after the Ekman-like spin up is completed, magneto-inertial waves continue to propagate throughout the star, exciting torsional oscillations in the crust and plasma. The crust oscillation is irregular and quasi-periodic, with a dominant frequency of the order of seconds. Crust oscillations commence after an Alfvn crossing time, approximately half a minute at the magnetic pole, and are subsequently damped by the electron viscosity over approximately an hour. In rapidly rotating stars, the magneto-inertial spectrum in the core approaches a continuum, and crust oscillations are damped by resonant absorption analogous to quasi-periodic oscillations in magnetars. The oscillations predicted are unlikely to be observed in timing data from existing radio telescopes, but may be visible to next generation telescope arrays.

  20. Periodicity of the solar full-disk magnetic fields

    SciTech Connect (OSTI)

    Xiang, N. B.; Qu, Z. N.; Zhai, Q.

    2014-07-01

    A full-disk solar magnetogram has been measured each day since 1970 January 19, and the daily Magnetic Plage Strength Index (MPSI) and the daily Mount Wilson Sunspot Index (MWSI) were calculated for each magnetogram at the Mount Wilson Observatory. The MPSI and MWSI are used to investigate the periodicity of the solar full-disk magnetic activity through autocorrelation analyses. Just two periods, the solar cycle and the rotation cycle, are determined in both the MPSI (the solar full-disk weak magnetic field activity) and MWSI (the solar full-disk strong magnetic field activity) with no annual signal found. The solar cycle for MPSI (10.83 yr) is found to be obviously longer than that for MWSI (9.77 yr). The rotation cycle is determined to be 26.8 ± 0.63 sidereal days for MPSI and 27.4 ± 2.4 sidereal days for MWSI. The rotation cycle length for MPSI is found to fluctuate around 27 days within a very small amplitude, but for MWSI it obviously temporally varies with a rather large amplitude. The rotation cycle for MWSI seems longer near solar minimum than at solar maximum. Cross-correlation analyses of daily MPSI and MWSI are carried out, and it is inferred that the MPSI components partly come from relatively early MWSI measurements.

  1. PULSATION PERIOD VARIATIONS IN THE RRc LYRAE STAR KIC 5520878

    SciTech Connect (OSTI)

    Hippke, Michael; Learned, John G.; Zee, A.; Edmondson, William H.; Lindner, John F.; Kia, Behnam; Ditto, William L.; Stevens, Ian R. E-mail: jgl@phys.hawaii.edu E-mail: w.h.edmondson@bham.ac.uk E-mail: wditto@hawaii.edu E-mail: irs@star.sr.bham.ac.uk

    2015-01-01

    Learned et al. proposed that a sufficiently advanced extra-terrestrial civilization may tickle Cepheid and RR Lyrae variable stars with a neutrino beam at the right time, thus causing them to trigger early and jogging the otherwise very regular phase of their expansion and contraction. This would turn these stars into beacons to transmit information throughout the galaxy and beyond. The idea is to search for signs of phase modulation (in the regime of short pulse duration) and patterns, which could be indicative of intentional, omnidirectional signaling. We have performed such a search among variable stars using photometric data from the Kepler space telescope. In the RRc Lyrae star KIC 5520878, we have found two such regimes of long and short pulse durations. The sequence of period lengths, expressed as time series data, is strongly autocorrelated, with correlation coefficients of prime numbers being significantly higher (p = 99.8%). Our analysis of this candidate star shows that the prime number oddity originates from two simultaneous pulsation periods and is likely of natural origin. Simple physical models elucidate the frequency content and asymmetries of the KIC 5520878 light curve. Despite this SETI null result, we encourage testing of other archival and future time-series photometry for signs of modulated stars. This can be done as a by-product to the standard analysis, and can even be partly automated.

  2. FORTE log periodic antenna. Phase 1, Final report

    SciTech Connect (OSTI)

    Not Available

    1993-04-22

    This report summarizes the results of ABLE`s design study of the FORTE deployable log periodic antenna. The resulting Baseline Design of the antenna is the basis for ABLE`s proposal for Phase II of this program. ABLE`s approach to meeting the requirements is to use a coilable ABLE mast as the deployable structure ``backbone`` of the antenna and to use deployable tubes for. the log periodic dipole elements of the antenna. This general approach was adopted at the outset of the Phase I Design Study. The remainder of the study was devoted to detailed design and analysis to properly size these types of mast and antenna elements and to design their deployment mechanisms. Demonstration models of the mast and antenna element deployer were fabricated as part of Phase I study. The study showed that ABLE`s design approach is feasible and can meet all the specified design requirements except the mass limit of 13.5 kg. Results of the design and analysis studies are summarized in this report. The mast and dipole element deployer are to be demonstrated to LANL personnel at the conclusion of this Phase I study.

  3. Periodic local MP2 method employing orbital specific virtuals

    SciTech Connect (OSTI)

    Usvyat, Denis Schütz, Martin; Maschio, Lorenzo

    2015-09-14

    We introduce orbital specific virtuals (OSVs) to represent the truncated pair-specific virtual space in periodic local Møller-Plesset perturbation theory of second order (LMP2). The OSVs are constructed by diagonalization of the LMP2 amplitude matrices which correspond to diagonal Wannier-function (WF) pairs. Only a subset of these OSVs is adopted for the subsequent OSV-LMP2 calculation, namely, those with largest contribution to the diagonal pair correlation energy and with the accumulated value of these contributions reaching a certain accuracy. The virtual space for a general (non diagonal) pair is spanned by the union of the two OSV sets related to the individual WFs of the pair. In the periodic LMP2 method, the diagonal LMP2 amplitude matrices needed for the construction of the OSVs are calculated in the basis of projected atomic orbitals (PAOs), employing very large PAO domains. It turns out that the OSVs are excellent to describe short range correlation, yet less appropriate for long range van der Waals correlation. In order to compensate for this bias towards short range correlation, we augment the virtual space spanned by the OSVs by the most diffuse PAOs of the corresponding minimal PAO domain. The Fock and overlap matrices in OSV basis are constructed in the reciprocal space. The 4-index electron repulsion integrals are calculated by local density fitting and, for distant pairs, via multipole approximation. New procedures for determining the fit-domains and the distant-pair lists, leading to higher efficiency in the 4-index integral evaluation, have been implemented. Generally, and in contrast to our previous PAO based periodic LMP2 method, the OSV-LMP2 method does not require anymore great care in the specification of the individual domains (to get a balanced description when calculating energy differences) and is in that sense a black box procedure. Discontinuities in potential energy surfaces, which may occur for PAO-based calculations if one is not

  4. Property:OpenEI/UtilityRate/DemandChargePeriod1 | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 1 Pages using the property "OpenEIUtilityRateDemandChargePeriod1"...

  5. Chaotic dynamics in a periodically driven spin-1 condensate

    SciTech Connect (OSTI)

    Cheng Jing [Department of Physics, South China University of Technology, Guangzhou 510640 (China); Kavli Institute for Theoretical Physics China, CAS, Beijing 100190 (China)

    2010-02-15

    We use periodically modulated magnetic fields to drive spin-1 Bose-Einstein condensates (BECs) and study the corresponding spin-mixing dynamics. Due to the time-dependent driving, this system permits chaotic dynamics depending on the drive parameters, which could not occur in previous studies. From the investigation of the Poincare sections, we find there exist complex trajectories in the phase space, leading to very complicated structures of the phase space with mixed regular and chaotic regions. By calculating the quasienergy levels of the corresponding Floquet operators, the signatures of quantum chaos are also found in this system. The level spacing distribution is very close to the Poisson distribution or Wigner distribution when the corresponding classical dynamics is regular or chaotic.

  6. Instrumentation to Monitor Transient Developing Periodic Flow in Newtonian Slurries

    SciTech Connect (OSTI)

    Bamberger, Judith A.; Enderlin, Carl W.

    2014-08-03

    This paper describes measurement techniques developed and applied to characterize solids mobilization and mixing of Newtonian slurries that are subjected to transient, periodic, developing flows. Metrics to characterize mobilization and mixing are the just suspended velocity (UJS) and the cloud height (HC). Two ultrasonic instruments to characterize pulse jet mixing of slurries were developed and deployed to measure related metrics: the thickness of the settled bed (used to determine mobilization) and the concentration within the cloud as a function of elevation [C(Z)]. A second method, continuous sample extraction, characterization, and reinsertion was successfully used to measure average density and characterize the concentration within the cloud. Testing focused on mixing vessels using intermitent jet mixers oriented vertically downward. Descriptions of the instruments and instrument performance are presented. These techniques were an effective approach to characterize mixing phenomena, determine mixing energy required to fully mobilize vessel contents, and to determine mixing times for process evaluation.

  7. Transverse commensurability effect for vortices on periodic pinning arrays

    SciTech Connect (OSTI)

    Reichhardt, Charles; Reichhardt, Cynthia J

    2008-01-01

    Using computer simulations, we demonstrate a type of commensurability that occurs for vortices moving longitudinally through periodic pinning arrays in the presence of an additional transverse driving force. As a function of vortex density, there is a series of broad maxima in the transverse critical depinning force that do not fall at the matching fields where the number of vortices equals an integer multiple of the number of pinning sites. The commensurability effects are associated with dynamical states in which evenly spaced structures consisting of one or more moving rows of vortices form between rows of pinning sites. Remarkably, the critical transverse depinning force can be more than an order of magnitude larger than the longitudinal depinning force.

  8. Total Estimated Contract Cost: Contract Option Period: Performance

    Office of Environmental Management (EM)

    Performance Period Fee Earned FY2000 thru 2008 $102,622,325 FY2009 $12,259,719 FY2010 $35,789,418 FY2011 $24,126,240 FY2012 $24,995,209 FY2013 $6,340,762 FY2014 $16,285,867 FY2015 $35,931,000 $8,595,000 FY2016 $20,891,000 $9,310,000 FY2017 $24,849,000 FY2018 $99,100,000 FY2019 $129,700,000 Cumulative Fee $240,324,540 $595,298,540 $12,259,719 $35,789,418 $38,554,240 $41,785,209 $16,698,762 $37,117,867 Maximum Fee $595,298,540 Fee Available $102,622,325 $10,921,302,346 Completion Contract:

  9. IUPAC Periodic Table of Isotopes for the Educational Community

    SciTech Connect (OSTI)

    Holden N. E.; Holden,N.E.; Coplen,T.B.

    2012-07-15

    John Dalton first proposed the concept of atomic weights of the elements in the first decade of the nineteenth century. These atomic weights of the chemical elements were thought of as constants of nature, similar to the speed of light. Dmitri Mendeleev arranged the atomic weights of the elements in ascending order of value and used the systematic variation of their chemical properties to produce his Periodic Table of the Elements in 1869. Measurement of atomic weight values became an important chemical activity for a century and a half. Theodore Richards received a Noble Prize for his work in this area. In 1913, Fredrick Soddy found a species of radium, which had an atomic weight value of 228, compared to the familiar radium gas value of 226. Soddy coined the term 'isotope' (Greek for 'in the same place') to account for this second atomic weight value in the radium position of the Periodic Table. Both of these isotopes of radium are radioactive. Radioactive isotopes are energetically unstable and will decay (disintegrate) over time. The time it takes for one half of a sample of a given radioactive isotope to decay is the half-life of that isotope. In addition to having different atomic weight values, radium-226 and radium-228 also have different half-life values. Around the same time as Soddy's work, J.J. Thomson (discoverer of the electron) identified two stable (non-radioactive) isotopes of the same element, neon. Over the next 40 years, the majority of the known chemical elements were found to have two or more stable (or long-lived radioactive isotopes that contribute significantly to the determination of the atomic weights of the elements).

  10. Physics Division progress report for period ending September 30, 1984

    SciTech Connect (OSTI)

    Livingston, A.B. (ed.)

    1985-01-01

    The research activities of the Division are centered primarily in three areas: experimental nuclear physics, experimental atomic physics, and theoretical nuclear and atomic physics. The largest of these efforts, experimental nuclear physics, is dominated by the heavy ion research program. A major responsibility under this program is the operation of the Holifield Heavy Ion Research Facility as a national user facility. During the period of this report, the facility has begun routine operation for the experimental program. The experimental atomic physics program has two components: the accelerator-based studies of basic collisional phenomena and the studies in support of the controlled fusion program. Also associated with the fusion-related studies are a plasma diagnostics program and the operation of an atomic physics data center. The theoretical physics program, both nuclear and atomic, is covered. This program has benefited this year from the success of the VAX-AP computer system and from the increase in manpower provided by the ORNL/University of Tennessee Distinguished Scientist Program. Smaller programs in applications and high-energy physics are summarized. During the period of this report, we continued to explore possible future extensions of the Holifield Facility. We retain a strong interest in a relativistic heavy-ion collider in the 10 x 10 GeV/nuclear energy range. The ideas for such a facility, described in last year's report, have been modified to utilize the HHIRF 25 MV tandem accelerator as the first stage. Finally, the report concludes with some general information on publications, Division activities, and personnel changes.

  11. Energy Conservation Program for Consumer Products: Test Procedures for Furnaces and Boilers, Comment Period Extension

    Broader source: Energy.gov [DOE]

    Energy Conservation Program for Consumer Products: Test Procedures for Furnaces and Boilers, Comment Period Extension

  12. Physics division. Progress report for period ending September 30, 1996

    SciTech Connect (OSTI)

    Ball, S.J.

    1997-04-01

    This report covers the research and development activities of the Physics Division for the 1995 and 1996 fiscal years, beginning October 1, 1994, and ending September 30, 1996. The activities of the Division continue to be concentrated in the areas of experimental nuclear physics, experimental atomic physics, and theoretical nuclear and atomic physics. In addition, there are smaller programs in plasma diagnostics and data compilation and evaluation. During the period of this report, there has been considerable success in bringing the Holifield Radioactive Ion Beam Facility (HRIBF) into routine operation. The budgets of the nuclear physics portion of the Division have increased each year in nearly all areas, and several new members have been added to the Division research and development staff. On August 30, 1996, the HRIBF successfully accelerated its first radioactive ion beams, {sup 69}As and {sup 70}As. Prior to this, the heart of the facility, the RIB injector system, was completed, including installation of a remote handling system for the target/ion source assembly. Target and ion source development is likely to be the technical key to success of the HRIBF. We have expanded our efforts in those development areas. Of special note is the development of highly permeable composite targets which have now been shown to allow release of difficult-to-produce radioactive ions such as {sup 17,18}F. A summary of the HRIBF work is provided in Chapter 1, along with supporting activities of the Joint Institute for Heavy Ion Research.

  13. Xenon plasma sustained by pulse-periodic laser radiation

    SciTech Connect (OSTI)

    Rudoy, I. G.; Solovyov, N. G.; Soroka, A. M.; Shilov, A. O.; Yakimov, M. Yu.

    2015-10-15

    The possibility of sustaining a quasi-stationary pulse-periodic optical discharge (POD) in xenon at a pressure of p = 10–20 bar in a focused 1.07-μm Yb{sup 3+} laser beam with a pulse repetition rate of f{sub rep} ⩾ 2 kHz, pulse duration of τ ⩾ 200 μs, and power of P = 200–300 W has been demonstrated. In the plasma development phase, the POD pulse brightness is generally several times higher than the stationary brightness of a continuous optical discharge at the same laser power, which indicates a higher plasma temperature in the POD regime. Upon termination of the laser pulse, plasma recombines and is then reinitiated in the next pulse. The initial absorption of laser radiation in successive POD pulses is provided by 5p{sup 5}6s excited states of xenon atoms. This kind of discharge can be applied in plasma-based high-brightness broadband light sources.

  14. THE DECAYING LONG-PERIOD OSCILLATION OF A STELLAR MEGAFLARE

    SciTech Connect (OSTI)

    Anfinogentov, S.; Nakariakov, V. M.; Mathioudakis, M.; Van Doorsselaere, T.; Kowalski, A. F.

    2013-08-20

    We analyze and interpret the oscillatory signal in the decay phase of the U-band light curve of a stellar megaflare observed on 2009 January 16 on the dM4.5e star YZ CMi. The oscillation is well approximated by an exponentially decaying harmonic function. The period of the oscillation is found to be 32 minutes, the decay time about 46 minutes, and the relative amplitude 15%. As this observational signature is typical of the longitudinal oscillations observed in solar flares at extreme ultraviolet and radio wavelengths, associated with standing slow magnetoacoustic waves, we suggest that this megaflare may be of a similar nature. In this scenario, macroscopic variations of the plasma parameters in the oscillations modulate the ejection of non-thermal electrons. The phase speed of the longitudinal (slow magnetoacoustic) waves in the flaring loop or arcade, the tube speed, of about 230 km s{sup -1} would require a loop length of about 200 Mm. Other mechanisms, such as standing kink oscillations, are also considered.

  15. An optimized periodic inspection program for condensers and feedwater heaters

    SciTech Connect (OSTI)

    Reinhart, E.R.; Kaminski, S.

    1996-12-31

    Tube failures in steam plant surface condensers and feedwater heaters are a significant reliability problem for the electric power industry. Tube failures can also result in an increase in replacement power costs. In addition, condenser leaks from failed tubes have potentially harmful effects on major components such as steam generators and turbines. To reduce the number of tube failures and consequent leakage, periodic maintenance programs have used the nondestructive evaluation (NDE) method of eddy-current testing (ET) to inspect the condition of the tubes from the water side. This NDE method can identify tubes that have experienced major degradation and should be plugged to prevent in-service failure. However, the use of NDE methods in plant maintenance of condensers and feedwater heaters is not standard practice and varies significantly throughout the utility industry. Variability of inspection results and difficulty in inspecting some types of tubing (monel, carbon steel) have caused many utility sites to question the value of in-service inspection of heat transfer tubing from the water side. Recognizing the above problem, advanced ET systems have been developed that use multi-frequency, remote field and digital data processing techniques to inspect a wide variety of tubing materials and produce on-site inspection reports. Recent field examination results will be presented.

  16. Simulation of period doubling of recurrent solar wind structures

    SciTech Connect (OSTI)

    Whang, Y.C. ); Burlaga, L.F. )

    1990-12-01

    In 1974, IMP, Pioneer 11 and Pioneer 10 observed a recurrent solar wind structure over five consecutive solar rotations at three different trajectories between 1 and 6 AU. Using MHD simulations and input functions generated from plasma and magnetic field data observed from Pioneer 11. The authors study the continuing evolution of this solar wind structure between 5 and 20 AU. This simulation uses the shock interactions model which treats MHD shocks as discontinuity surfaces with zero thickness and which uses the exact Rankine-Hugoniot relations to describe the jump conditions. The model can calculate the collision and merging of shocks and the dynamical evolution of the solar wind in the outer heliosphere. The simulation result shows that between 5 and 10 AU there is an evolution from two corotating interaction regions per solar rotation to one merged interaction region (MIR) per solar rotation near 10 AU, i.e., period doubling has occurred. Each MIR was bounded by a forward and a reverse shock and additional weaker shocks may exist inside the MIR. Between 10 and 20 AU the structure of one MIR per solar rotation appears as a very persistent structure.

  17. Highly compressible 3D periodic graphene aerogel microlattices

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Zhu, Cheng; Han, T. Yong-Jin; Duoss, Eric B.; Golobic, Alexandra M.; Kuntz, Joshua D.; Spadaccini, Christopher M.; Worsley, Marcus A.

    2015-04-22

    Graphene is a two-dimensional material that offers a unique combination of low density, exceptional mechanical properties, large surface area and excellent electrical conductivity. Recent progress has produced bulk 3D assemblies of graphene, such as graphene aerogels, but they possess purely stochastic porous networks, which limit their performance compared with the potential of an engineered architecture. Here we report the fabrication of periodic graphene aerogel microlattices, possessing an engineered architecture via a 3D printing technique known as direct ink writing. The 3D printed graphene aerogels are lightweight, highly conductive and exhibit supercompressibility (up to 90% compressive strain). Moreover, the Young’s modulimore » of the 3D printed graphene aerogels show an order of magnitude improvement over bulk graphene materials with comparable geometric density and possess large surface areas. Ultimately, adapting the 3D printing technique to graphene aerogels realizes the possibility of fabricating a myriad of complex aerogel architectures for a broad range of applications.« less

  18. Lithospheric Thickness Modeled from Long Period Surface Wave Dispersion

    SciTech Connect (OSTI)

    Pasyanos, M E

    2008-05-15

    The behavior of surface waves at long periods is indicative of subcrustal velocity structure. Using recently published dispersion models, we invert surface wave group velocities for lithospheric structure, including lithospheric thickness, over much of the Eastern Hemisphere, encompassing Eurasia, Africa, and the Indian Ocean. Thicker lithosphere under Precambrian shields and platforms are clearly observed, not only under the large cratons (West Africa, Congo, Baltic, Russia, Siberia, India), but also under smaller blocks like the Tarim Basin and Yangtze craton. In contrast, it is found that remobilized Precambrian structures like the Saharan Shield and Sino-Korean Paraplatform do not have well-established lithospheric keels. The thinnest lithospheric thickness is found under oceanic and continental rifts, as well as along convergence zones. We compare our results to thermal models of continental lithosphere, lithospheric cooling models of oceanic lithosphere, lithosphere-asthenosphere boundary (LAB) estimates from S-wave receiver functions, and velocity variations of global tomography models. In addition to comparing results for the broad region, we examine in detail the regions of Central Africa, Siberia, and Tibet. While there are clear differences in the various estimates, overall the results are generally consistent. Inconsistencies between the estimates may be due to a variety of reasons including lateral and depth resolution differences and the comparison of what may be different lithospheric features.

  19. The transition mechanism from a symmetric single period discharge to a period-doubling discharge in atmospheric helium dielectric-barrier discharge

    SciTech Connect (OSTI)

    Zhang, Dingzong; Wang, Yanhui; Wang, Dezhen [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)] [School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024 (China)

    2013-06-15

    Period-doubling and chaos phenomenon have been frequently observed in atmospheric-pressure dielectric-barrier discharges. However, how a normal single period discharge bifurcates into period-doubling state is still unclear. In this paper, by changing the driving frequency, we study numerically the transition mechanisms from a normal single period discharge to a period-doubling state using a one-dimensional self-consistent fluid model. The results show that before a discharge bifurcates into a period-doubling state, it first deviates from its normal operation and transforms into an asymmetric single period discharge mode. Then the weaker discharge in this asymmetric discharge will be enhanced gradually with increasing of the frequency until it makes the subsequent discharge weaken and results in the discharge entering a period-doubling state. In the whole transition process, the spatial distribution of the charged particle density and the electric field plays a definitive role. The conclusions are further confirmed by changing the gap width and the amplitude of the applied voltage.

  20. Property:Building/SPPurchasedEngyForPeriodMwhYrNaturalGas | Open...

    Open Energy Info (EERE)

    gyForPeriodMwhYrNaturalGas Jump to: navigation, search This is a property of type String. Natural gas Pages using the property "BuildingSPPurchasedEngyForPeriodMwhYrNaturalGas"...

  1. DOE/EIS-0463 and EIS-0463-S1: EPA Notice of Public Comment Period...

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

    DOEEIS-0463 and EIS-0463-S1: EPA Notice of Public Comment Period Extension DOEEIS-0463 and EIS-0463-S1: EPA Notice of Public Comment Period Extension Northern Pass Transmission...

  2. World Geothermal Power Generation in the Period 2001-2005 | Open...

    Open Energy Info (EERE)

    in the Period 2001-2005 Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: World Geothermal Power Generation in the Period 2001-2005 Abstract A...

  3. Mirant: Summary of Monitored SO2 Concentrations During Periods of Highest

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

    Impact | Department of Energy Mirant: Summary of Monitored SO2 Concentrations During Periods of Highest Impact Mirant: Summary of Monitored SO2 Concentrations During Periods of Highest Impact Docket No. EO-05-01: Tables showing a summary of monitored SO2 concentrations during periods of highest impact as well as ERMOD modeling results for SO2 scenarios. Mirant: Summary of Monitored SO2 Concentrations During Periods of Highest Impact (285.92 KB) More Documents & Publications Answer of

  4. DIRECT ENERGY CONVERSION FISSION REACTOR FOR THE PERIOD JUNE 1, 2001 THROUGH SEPTEMBER 30, 2001

    SciTech Connect (OSTI)

    L.C. BROWN

    2001-09-30

    OAK-B135 DIRECT ENERGY CONVERSION FISSION REACTOR FOR THE PERIOD JUNE 1, 2001 THROUGH SEPTEMBER 30, 2001

  5. NEI Request for Extension of Public Comment Period DOE-HQ-201.... |

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

    Department of Energy Request for Extension of Public Comment Period DOE-HQ-201.... NEI Request for Extension of Public Comment Period DOE-HQ-201.... 2015 01 28 NEI Request for Extension of Public Comment Period DOE-HQ-201... (612.74 KB) More Documents & Publications NOPR NEI Nuclear Energy Institute (NEI) Ex Parte NOPR Fluor

  6. NuScale Power Request for Extension of Public Comment Period | Department

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

    of Energy NuScale Power Request for Extension of Public Comment Period NuScale Power Request for Extension of Public Comment Period NuScale Power Request for Extension of Public Comment Period (107.72 KB) More Documents & Publications Audit Report: OAI-M-16-11 CX-011842: Categorical Exclusion Determination CSC_Extension.PDF

  7. EIS-0387: Extension of Scoping Period for the Notice of Intent To Prepare a

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

    Site-Wide Environmental Impact Statement | Department of Energy Extension of Scoping Period for the Notice of Intent To Prepare a Site-Wide Environmental Impact Statement EIS-0387: Extension of Scoping Period for the Notice of Intent To Prepare a Site-Wide Environmental Impact Statement Y-12 National Security Complex Project, Oak Ridge, Tennessee The National Nuclear Security Administration (NNSA), an agency within the U.S. Department of Energy (DOE), is extending the scoping period for the

  8. EIS-0431: Extension of public comment period; Notice of public hearing

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

    (Correction) | Department of Energy public comment period; Notice of public hearing (Correction) EIS-0431: Extension of public comment period; Notice of public hearing (Correction) Hydrogen Energy California's Integrated Gasification Combined Cycle and Carbon Capture and Sequestration Project, CA On Monday, August 26, 2013, DOE published a Notice of Extension of Public Comment Period and Public Hearing for the Hydrogen Energy California's Integrated Gasification Combined Cycle Project

  9. EIS-0486: DOE Notice of Public Comment Period Extension | Department of

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

    Energy Public Comment Period Extension EIS-0486: DOE Notice of Public Comment Period Extension Plains & Eastern Clean Line Transmission Project DOE is extending the public comment period for the Draft Environmental Impact Statement for the Plains & Eastern Clean Line Transmission Project (DOE/EIS-0486) to April 20, 2015. Comments submitted to DOE concerning the Plains & Eastern EIS prior to this announcement do not need to be resubmitted as a result of this extension of the

  10. EIS-0486: EPA Notice of Public Comment Period Extension | Department of

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

    Energy Public Comment Period Extension EIS-0486: EPA Notice of Public Comment Period Extension Plains & Eastern Clean Line Transmission Project EPA announces that the DOE is extending the public comment period for the Draft Environmental Impact Statement for the Plains & Eastern Clean Line Transmission Project (DOE/EIS-0486) to April 20, 2015. Comments submitted to DOE concerning the Plains & Eastern EIS prior to this announcement do not need to be resubmitted as a result of this

  11. EIS-0504: Notice of Extension of Scoping Period | Department of Energy

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

    Extension of Scoping Period EIS-0504: Notice of Extension of Scoping Period Gulf LNG Liquefaction Project, Jackson County, Mississippi FERC extended the scoping period to September 15, 2014. For more information on this project, see the project page: http://energy.gov/node/948516. Download Document EIS-0504: Notice of Intent to Prepare Environmental Impact Statement (8.41 KB) More Documents & Publications EIS-0512: Notice of Public Scoping Meetings EIS-0512: Notice of Public Scoping Meetings

  12. EA-1880: Notice of Public Comment Period Extension | Department of Energy

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

    0: Notice of Public Comment Period Extension EA-1880: Notice of Public Comment Period Extension Big Bend to Witten Transmission Line, South Dakota The USDA Rural Utilities Service extended the public comment period for the draft EA it issued on January 28, 2015 to March 30, 2015. For more information on this project, including actions that DOE's Western Area Power Administration proposes as part of this proposed Project, see the project webpage:

  13. DOE Extends Public Comment Period for the Draft Uranium Leasing Program

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

    Programmatic Environmental Impact Statement | Department of Energy Extends Public Comment Period for the Draft Uranium Leasing Program Programmatic Environmental Impact Statement DOE Extends Public Comment Period for the Draft Uranium Leasing Program Programmatic Environmental Impact Statement April 17, 2013 - 8:21am Addthis DOE Extends Public Comment Period for the Draft Uranium Leasing Program Programmatic Environmental Impact Statement The U.S. Department of Energy (DOE) today announced

  14. DOE Extends Comment Period for Reply Comments on Reducing Regulatory Burden

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

    | Department of Energy Extends Comment Period for Reply Comments on Reducing Regulatory Burden DOE Extends Comment Period for Reply Comments on Reducing Regulatory Burden March 31, 2011 - 5:13pm Addthis The Department of Energy today announces an extension of the reply comment period for its Request for Information implementing Executive Order 13563, seeking public comment on how best to review its existing regulations. The Department is interested in receiving comment on the suggestions and

  15. Public Comment Period for Portsmouth Site D&D and Waste Disposition Decisions

    Broader source: Energy.gov [DOE]

    Public Comment Period for the Process Buildings and Complex Facilities Decontamination and Decommissioning and Site-Wide Waste Disposition Decisions at the Portsmouth Gaseous Diffusion Plant

  16. EIS-0350-S1: Extension of the Public Review and Comment Period...

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

    Period and Announcement of an Additional Public Hearing for the Draft Supplemental Environmental Impact Statement for the Nuclear Facility Portion of the Chemistry and...

  17. EIS-0250-S1: Notice of Public Comment Period Extension and Additional...

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

    Notice of Public Comment Period Extension and Additional Public Meeting Geologic Repository for the Disposal of Spent Nuclear Fuel and High-Level Radioactive Waste at Yucca...

  18. A Low-Cost, High-Efficiency Periodic Flow Gas Turbine for Distributed Energy Generation

    SciTech Connect (OSTI)

    Dr. Adam London

    2008-06-20

    The proposed effort served as a feasibility study for an innovative, low-cost periodic flow gas turbine capable of realizing efficiencies in the 39-48% range.

  19. Property:OpenEI/UtilityRate/DemandChargePeriod7FAdj | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 7 Fuel Adj Retrieved from "http:en.openei.orgwindex.php?titleProper...

  20. EIS-0426: Notice of Extension of Public Comment Period for the...

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

    More Documents & Publications EIS-0426: Notice of Extension of Comment Period EIS-0403-S1: EPA Notice of Availability of the Supplement to the Draft Programmatic Environmental...

  1. EIS-0466: Re-opening of Public Scoping Period and Announcement...

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

    Continued Operation of the Sandia National Laboratories, New Mexico Comment Period Ends: ... Impact Statement (SWEIS) for the Sandia National Laboratories, New Mexico (DOEEIS-0466). ...

  2. Property:OpenEI/UtilityRate/DemandChargePeriod8 | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 8 Retrieved from "http:en.openei.orgwindex.php?titleProperty:OpenEI...

  3. Property:OpenEI/UtilityRate/DemandChargePeriod3FAdj | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 3 Fuel Adj Retrieved from "http:en.openei.orgwindex.php?titleProper...

  4. Property:OpenEI/UtilityRate/DemandChargePeriod6 | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 6 Retrieved from "http:en.openei.orgwindex.php?titleProperty:OpenEI...

  5. Property:OpenEI/UtilityRate/DemandChargePeriod4FAdj | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 4 Fuel Adj Retrieved from "http:en.openei.orgwindex.php?titleProper...

  6. Property:OpenEI/UtilityRate/DemandChargePeriod8FAdj | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 8 Fuel Adj Retrieved from "http:en.openei.orgwindex.php?titleProper...

  7. Property:OpenEI/UtilityRate/DemandChargePeriod4 | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 4 Retrieved from "http:en.openei.orgwindex.php?titleProperty:OpenEI...

  8. Property:OpenEI/UtilityRate/DemandChargePeriod6FAdj | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 6 Fuel Adj Retrieved from "http:en.openei.orgwindex.php?titleProper...

  9. Property:OpenEI/UtilityRate/DemandChargePeriod7 | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 7 Retrieved from "http:en.openei.orgwindex.php?titleProperty:OpenEI...

  10. Property:OpenEI/UtilityRate/DemandChargePeriod1FAdj | Open Energy...

    Open Energy Info (EERE)

    Jump to: navigation, search This is a property of type Number. Name: Demand Charge Period 1 Fuel Adj Retrieved from "http:en.openei.orgwindex.php?titleProper...