National Library of Energy BETA

Sample records for xmcd chamber 6t

  1. XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorkingLos Alamos verifies largest single Micropulse lidar cloudZCSPDForIn

  2. XMCD Analysis Beyond Standard Procedures H. Wende ' *, A. Scherz 2

    E-Print Network [OSTI]

    Burke, Kieron

    , failure sum rule and multipole moment analysis, induced magnetism, light 3d metals and rare earth metals in rare earth metals. New address: Angewandte Physik - AG Wende, Fachbereich Physik, Universitat Duisburg) The analysis of the £2,3 XMCD of rare earth elements is not only hampered by the appearance of electric

  3. XMCD analysis beyond standard procedures , A. Scherz 1,

    E-Print Network [OSTI]

    Gross, E.K.U.

    and multipole moment analysis, induced magnetism, light 3d metals and rare earth metals PACS: 78.70.Dm, 78.70.Ls moments in light 3d elements as well as the 5d magnetism in rare earth metals. 1 New address: SSRL of the L2,3 XMCD of rare earth elements is not only hampered by the appearance of electric quadrupolar

  4. Iron site occupancies in magnetite-ulvospinel solid solution: A new approach using XMCD

    SciTech Connect (OSTI)

    Pearce, C. I.; Henderson, C. M. B.; Telling, N. D.; Pattrick, R. A.D.; Vaughan, D. J.; Charnock, J. M.; Arenholz, E.; Tuna, F.; Coker, V.S.; Laan, G. van der

    2009-06-22

    Ordering of Fe{sup 3+} and Fe{sup 2+} between octahedral (Oh) and tetrahedral (Td) sites in synthetic members of the magnetite (Fe{sub 3}O{sub 4}) - ulvoespinel (Fe{sub 2}TiO{sub 4}) solid-solution series was determined using Fe L{sub 2,3}-edge X-ray magnetic circular dichroism (XMCD) coupled with electron microprobe and chemical analysis, Ti L-edge spectroscopy, Fe K-edge EXAFS and XANES, Fe{sub 57} Moessbauer spectroscopy, and unit cell parameters. Microprobe analysis, cell edges and chemical FeO determinations showed that the bulk compositions of the samples were stoichiometric magnetite-ulvoespinel solid-solutions. Surface sensitive XMCD showed that the surfaces of these oxide minerals were more sensitive to redox conditions and some samples required re-equilibration with suitable solid-solid buffers. Detailed site-occupancy analysis of these samples gave XMCD-Fe{sup 2+}/Fe{sup 3+} ratios very close to stoichiometric values. L{sub 2,3}-edge spectroscopy showed that Ti{sup 4+} was restricted to Oh sites. XMCD results showed that significant Fe{sup 2+} only entered Td when the Ti content was > 0.40 apfu while Fe{sup 2+} in Oh increased from 1 a.p.f.u in magnetite to a maximum of {approx}1.4 apfu in USP45. As the Ti content increased from this point, the steady increase in Fe{sup 2+} in Td sites was clearly observable in the XMCD spectra, concurrent with a slow decrease in Fe{sup 2+} in Oh sites. Calculated magnetic moments showed a steady decrease from magnetite (4.06 {mu}{sub B}) to USP45 (1.5 {mu}{sub B}) and then a slower decrease towards the value for ulvoespinel (0 {mu}{sub B}). Two of the synthesized samples were also partially maghemitized by re-equilibrating with an oxidizing Ni-NiO buffer and XMCD showed that Fe{sup 2+} oxidation only occurred at Oh sites, with concomitant vacancy formation restricted to this site. This study shows the advantage of using XMCD as a direct measurement of Fe oxidation state in these complex magnetic spinels. These results can be used to rationalize the magnetic properties of titanomagnetites, and their oxidized titanomaghemitized analogues, in Earth's crustal rocks.

  5. Flow chamber

    DOE Patents [OSTI]

    Morozov, Victor (Manassas, VA)

    2011-01-18

    A flow chamber having a vacuum chamber and a specimen chamber. The specimen chamber may have an opening through which a fluid may be introduced and an opening through which the fluid may exit. The vacuum chamber may have an opening through which contents of the vacuum chamber may be evacuated. A portion of the flow chamber may be flexible, and a vacuum may be used to hold the components of the flow chamber together.

  6. Wire chamber

    DOE Patents [OSTI]

    Atac, Muzaffer (Wheaton, IL)

    1989-01-01

    A wire chamber or proportional counter device, such as Geiger-Mueller tube or drift chamber, improved with a gas mixture providing a stable drift velocity while eliminating wire aging caused by prior art gas mixtures. The new gas mixture is comprised of equal parts argon and ethane gas and having approximately 0.25% isopropyl alcohol vapor.

  7. Target Chamber

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking With U.S. Coal StocksSuppliers Tag:TakeSeptember 13,TaraTarget Chamber

  8. Two chamber reaction furnace

    DOE Patents [OSTI]

    Blaugher, Richard D. (Evergreen, CO)

    1998-05-05

    A vertical two chamber reaction furnace. The furnace comprises a lower chamber having an independently operable first heating means for heating the lower chamber and a gas inlet means for admitting a gas to create an ambient atmosphere, and an upper chamber disposed above the lower chamber and having an independently operable second heating means for heating the upper chamber. Disposed between the lower chamber and the upper chamber is a vapor permeable diffusion partition. The upper chamber has a conveyor means for conveying a reactant there through. Of particular importance is the thallinating of long-length thallium-barium-calcium-copper oxide (TBCCO) or barium-calcium-copper oxide (BCCO) precursor tapes or wires conveyed through the upper chamber to thereby effectuate the deposition of vaporized thallium (being so vaporized as the first reactant in the lower chamber at a temperature between about 700.degree. and 800.degree. C.) on TBCCO or BCCO tape or wire (the second reactant) at its simultaneous annealing temperature in the upper chamber of about 800.degree. to 950.degree. C. to thereby replace thallium oxide lost from TBCCO tape or wire because of the high annealing temperature or to deposit thallium on BCCO tape or wire. Continuously moving the tape or wire provides a single-step process that effectuates production of long-length TBCCO superconducting product.

  9. BNL | ATF Experimental Chambers

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

    Laser Injection Vacuum Chamber Located on beam line 1, the "Smith-Purcell box" has 140 liters of usable volume. Due to its size, it is mounted on a fixed platform. Hosted...

  10. Sleeve reaction chamber system

    DOE Patents [OSTI]

    Northrup, M. Allen (Berkeley, CA); Beeman, Barton V. (San Mateo, CA); Benett, William J. (Livermore, CA); Hadley, Dean R. (Manteca, CA); Landre, Phoebe (Livermore, CA); Lehew, Stacy L. (Livermore, CA); Krulevitch, Peter A. (Pleasanton, CA)

    2009-08-25

    A chemical reaction chamber system that combines devices such as doped polysilicon for heating, bulk silicon for convective cooling, and thermoelectric (TE) coolers to augment the heating and cooling rates of the reaction chamber or chambers. In addition the system includes non-silicon-based reaction chambers such as any high thermal conductivity material used in combination with a thermoelectric cooling mechanism (i.e., Peltier device). The heat contained in the thermally conductive part of the system can be used/reused to heat the device, thereby conserving energy and expediting the heating/cooling rates. The system combines a micromachined silicon reaction chamber, for example, with an additional module/device for augmented heating/cooling using the Peltier effect. This additional module is particularly useful in extreme environments (very hot or extremely cold) where augmented heating/cooling would be useful to speed up the thermal cycling rates. The chemical reaction chamber system has various applications for synthesis or processing of organic, inorganic, or biochemical reactions, including the polymerase chain reaction (PCR) and/or other DNA reactions, such as the ligase chain reaction.

  11. Automated soil gas monitoring chamber

    DOE Patents [OSTI]

    Edwards, Nelson T.; Riggs, Jeffery S.

    2003-07-29

    A chamber for trapping soil gases as they evolve from the soil without disturbance to the soil and to the natural microclimate within the chamber has been invented. The chamber opens between measurements and therefore does not alter the metabolic processes that influence soil gas efflux rates. A multiple chamber system provides for repetitive multi-point sampling, undisturbed metabolic soil processes between sampling, and an essentially airtight sampling chamber operating at ambient pressure.

  12. Secondary emission gas chamber

    E-Print Network [OSTI]

    V. In'shakov; V. Kryshkin; V. Skvortsov

    2014-12-10

    For a hadron calorimeter active element there is considered a gaseous secondary emis-sion detector (150 micron gap, 50 kV/cm). Such one-stage parallel plate chamber must be a radiation hard, fast and simple. A model of such detector has been produced, tested and some characteristics are presented.

  13. Mercury Chamber Considerations

    E-Print Network [OSTI]

    McDonald, Kirk

    Pump Gravity Drain Flow Control Valve Storage Tank Heat Exchanger Beam Dump #12;4 Managed by UT Mercury Jet Proton Beam Mercury Overflow Gravity Drain Flow Control Overflow drains WC Shielding #12 tungsten shielding · Chamber shape requires significant increase in complexity · Integrating resistive

  14. Improved wire chamber

    DOE Patents [OSTI]

    Atac, M.

    1987-05-12

    An improved gas mixture for use with proportional counter devices, such as Geiger-Mueller tubes and drift chambers. The improved gas mixture provides a stable drift velocity while eliminating wire aging caused by prior art gas mixtures. The new gas mixture is comprised of equal parts argon and ethane gas and having approximately 0.25% isopropyl alcohol vapor. 2 figs.

  15. Multi-chamber deposition system

    DOE Patents [OSTI]

    Jacobson, Richard L. (Roseville, MN); Jeffrey, Frank R. (Shoreview, MN); Westerberg, Roger K. (Cottage Grove, MN)

    1989-10-17

    A system for the simultaneous deposition of different coatings onto a thin web within a large volume vacuum chamber is disclosed which chamber is provided with a plurality of deposition chambers in which the different layers are deposited onto the film as its moves from a supply roll to a finished take-up roll of coated web. The deposition chambers provided within the large vacuum chamber are provided with separate seals which minimize back diffusion of any dopant gas from adjacent deposition chambers.

  16. Multi-chamber deposition system

    DOE Patents [OSTI]

    Jacobson, Richard L. (Roseville, MN); Jeffrey, Frank R. (Shoreview, MN); Westerberg, Roger K. (Cottage Grove, MN)

    1989-06-27

    A system for the simultaneous deposition of different coatings onto a thin web within a large volume vacuum chamber is disclosed which chamber is provided with a plurality of deposition chambers in which the different layers are deposited onto the film as its moves from a supply roll to a finished take-up roll of coated web. The deposition chambers provided within the large vacuum chamber are provided with separate seals which minimize back diffusion of any dopant gas from adjacent deposition chambers.

  17. Three chamber negative ion source

    DOE Patents [OSTI]

    Leung, Ka-Ngo (Hercules, CA); Ehlers, Kenneth W. (Alamo, CA); Hiskes, John R. (Livermore, CA)

    1985-01-01

    A negative ion vessel is divided into an excitation chamber, a negative ionization chamber and an extraction chamber by two magnetic filters. Input means introduces neutral molecules into a first chamber where a first electron discharge means vibrationally excites the molecules which migrate to a second chamber. In the second chamber a second electron discharge means ionizes the molecules, producing negative ions which are extracted into or by a third chamber. A first magnetic filter prevents high energy electrons from entering the negative ionization chamber from the excitation chamber. A second magnetic filter prevents high energy electrons from entering the extraction chamber from the negative ionizing chamber. An extraction grid at the end of the negative ion vessel attracts negative ions into the third chamber and accelerates them. Another grid, located adjacent to the extraction grid, carries a small positive voltage in order to inhibit positive ions from migrating into the extraction chamber and contour the plasma potential. Additional electrons can be suppressed from the output flux using ExB forces provided by magnetic field means and the extractor grid electric potential.

  18. Combustion chamber noise suppressor

    SciTech Connect (OSTI)

    Livingston, A.M.

    1986-08-19

    A combustion chamber is described for a hot fog generating machine comprising a hollow cylindrical combustion chamber shell having a closure plate at one end and outlet means at the opposite end for directing hot combustion gasses to a fogging nozzle, air inlet means disposed adjacent the outlet means, fuel inlet means and ignition means mounted in the closure plate and liner means disposed concentrically within the cylindrical combustion chamber for controlling the flow of air and combustion gasses within the shell. The liner means includes a liner base having a frustroconical configuration with the smaller diameter end thereof disposed in communication with the outlet means and with the larger diameter end thereof disposed in spaced relation to the shell, circumferentially spaced, longitudinally extending fins extending outwardly from the liner base intermediate the liner base and the shell, a cylindrical liner midsection having circumferentially spaced fins extending outwardly therefrom between the midsection and the shell with the fins supporting the midsection on the larger diameter end of the liner base.

  19. Vertical two chamber reaction furnace

    DOE Patents [OSTI]

    Blaugher, R.D.

    1999-03-16

    A vertical two chamber reaction furnace is disclosed. The furnace comprises a lower chamber having an independently operable first heating means for heating the lower chamber and a gas inlet means for admitting a gas to create an ambient atmosphere, and an upper chamber disposed above the lower chamber and having an independently operable second heating means for heating the upper chamber. Disposed between the lower chamber and the upper chamber is a vapor permeable diffusion partition. The upper chamber has a conveyor means for conveying a reactant there through. Of particular importance is the thallinating of long-length thallium-barium-calcium copper oxide (TBCCO) or barium-calcium-copper oxide (BCCO) precursor tapes or wires conveyed through the upper chamber to thereby effectuate the deposition of vaporized thallium (being so vaporized as the first reactant in the lower chamber at a temperature between about 700 and 800 C) on TBCCO or BCCO tape or wire (the second reactant) at its simultaneous annealing temperature in the upper chamber of about 800 to 950 C to thereby replace thallium oxide lost from TBCCO tape or wire because of the high annealing temperature or to deposit thallium on BCCO tape or wire. Continuously moving the tape or wire provides a single-step process that effectuates production of long-length TBCCO superconducting product. 2 figs.

  20. Vertical two chamber reaction furnace

    DOE Patents [OSTI]

    Blaugher, Richard D. (Evergreen, CO)

    1999-03-16

    A vertical two chamber reaction furnace. The furnace comprises a lower chamber having an independently operable first heating means for heating the lower chamber and a gas inlet means for admitting a gas to create an ambient atmosphere, and an upper chamber disposed above the lower chamber and having an independently operable second heating means for heating the upper chamber. Disposed between the lower chamber and the upper chamber is a vapor permeable diffusion partition. The upper chamber has a conveyor means for conveying a reactant there through. Of particular importance is the thallinating of long-length thallium-barium-calcium-copper oxide (TBCCO) or barium-calcium-copper oxide (BCCO) precursor tapes or wires conveyed through the upper chamber to thereby effectuate the deposition of vaporized thallium (being so vaporized as the first reactant in the lower chamber at a temperature between about 700.degree. and 800.degree. C.) on TBCCO or BCCO tape or wire (the second reactant) at its simultaneous annealing temperature in the upper chamber of about 800.degree. to 950.degree. C. to thereby replace thallium oxide lost from TBCCO tape or wire because of the high annealing temperature or to deposit thallium on BCCO tape or wire. Continuously moving the tape or wire provides a single-step process that effectuates production of long-length TBCCO superconducting product.

  1. MAIN CHAMBER NEUTRAL PRESSURE IN

    E-Print Network [OSTI]

    Pitcher, C. S.

    MAIN CHAMBER NEUTRAL PRESSURE IN ALCATOR C-MOD AND JET C S Pitcher, S K Erents*, W Fundamenski*, B on Controlled Fusion and Plasma Physics 18 ­ 22 June 1999, Madeira, Portugal MAIN CHAMBER NEUTRAL PRESSURE Science Centre, Abingdon, Oxon OX14 3DB,UK #12;(1) Introduction · main chamber gas can have a number

  2. Multi-anode ionization chamber

    DOE Patents [OSTI]

    Bolotnikov, Aleksey E. (South Setauket, NY); Smith, Graham (Port Jefferson, NY); Mahler, George J. (Rocky Point, NY); Vanier, Peter E. (Setauket, NY)

    2010-12-28

    The present invention includes a high-energy detector having a cathode chamber, a support member, and anode segments. The cathode chamber extends along a longitudinal axis. The support member is fixed within the cathode chamber and extends from the first end of the cathode chamber to the second end of the cathode chamber. The anode segments are supported by the support member and are spaced along the longitudinal surface of the support member. The anode segments are configured to generate at least a first electrical signal in response to electrons impinging thereon.

  3. Ionization chamber dosimeter

    DOE Patents [OSTI]

    Renner, Tim R. (Berkeley, CA); Nyman, Mark A. (Berkeley, CA); Stradtner, Ronald (Kensington, CA)

    1991-01-01

    A method for fabricating an ion chamber dosimeter collecting array of the type utilizing plural discrete elements formed on a uniform collecting surface which includes forming a thin insulating layer over an aperture in a frame having surfaces, forming a predetermined pattern of through holes in the layer, plating both surfaces of the layer and simultaneously tilting and rotating the frame for uniform plate-through of the holes between surfaces. Aligned masking and patterned etching of the surfaces provides interconnects between the through holes and copper leads provided to external circuitry.

  4. Ion chamber based neutron detectors

    DOE Patents [OSTI]

    Derzon, Mark S; Galambos, Paul C; Renzi, Ronald F

    2014-12-16

    A neutron detector with monolithically integrated readout circuitry, including: a bonded semiconductor die; an ion chamber formed in the bonded semiconductor die; a first electrode and a second electrode formed in the ion chamber; a neutron absorbing material filling the ion chamber; and the readout circuitry which is electrically coupled to the first and second electrodes. The bonded semiconductor die includes an etched semiconductor substrate bonded to an active semiconductor substrate. The readout circuitry is formed in a portion of the active semiconductor substrate. The ion chamber has a substantially planar first surface on which the first electrode is formed and a substantially planar second surface, parallel to the first surface, on which the second electrode is formed. The distance between the first electrode and the second electrode may be equal to or less than the 50% attenuation length for neutrons in the neutron absorbing material filling the ion chamber.

  5. Ultraviolet laser calibration of drift chambers

    E-Print Network [OSTI]

    Elliott, Grant (Grant Andrew)

    2006-01-01

    We demonstrate the use of a focused ultraviolet laser as a track calibration source in drift chambers, and specifically in a small time projection chamber (TPC). Drift chambers such as TPCs reconstruct the trajectories of ...

  6. Impedances of Laminated Vacuum Chambers

    SciTech Connect (OSTI)

    Burov, A.; Lebedev, V.; /Fermilab

    2011-06-22

    First publications on impedance of laminated vacuum chambers are related to early 70s: those are of S. C. Snowdon [1] and of A. G. Ruggiero [2]; fifteen years later, a revision paper of R. Gluckstern appeared [3]. All the publications were presented as Fermilab preprints, and there is no surprise in that: the Fermilab Booster has its laminated magnets open to the beam. Being in a reasonable mutual agreement, these publications were all devoted to the longitudinal impedance of round vacuum chambers. The transverse impedance and the flat geometry case were addressed in more recent paper of K. Y. Ng [4]. The latest calculations of A. Macridin et al. [5] revealed some disagreement with Ref. [4]; this fact stimulated us to get our own results on that matter. Longitudinal and transverse impendances are derived for round and flat laminated vacuum chambers. Results of this paper agree with Ref. [5].

  7. The TESLA Time Projection Chamber

    E-Print Network [OSTI]

    Nabil Ghodbane

    2002-12-12

    A large Time Projection Chamber is proposed as part of the tracking system for a detector at the TESLA electron positron linear collider. Different ongoing R&D studies are reviewed, stressing progress made on a new type readout technique based on Micro-Pattern Gas Detectors.

  8. Small scale vacuum chamber for general use

    E-Print Network [OSTI]

    Clayton, Alexander P

    2013-01-01

    For this thesis a small scale vacuum chamber assembly was designed and fabricated. This chamber's purpose is to provide high quality vacuum conditions for a variety of samples. Often these samples are in need of precise ...

  9. TRU waste characterization chamber gloveboxes.

    SciTech Connect (OSTI)

    Duncan, D. S.

    1998-07-02

    Argonne National Laboratory-West (ANL-W) is participating in the Department of Energy's (DOE) National Transuranic Waste Program in support of the Waste Isolation Pilot Plant (WIPP). The Laboratory's support currently consists of intrusive characterization of a selected population of drums containing transuranic waste. This characterization is performed in a complex of alpha containment gloveboxes termed the Waste Characterization Gloveboxes. Made up of the Waste Characterization Chamber, Sample Preparation Glovebox, and the Equipment Repair Glovebox, they were designed as a small production characterization facility for support of the Idaho National Engineering and Environmental Laboratory (INEEL). This paper presents salient features of these gloveboxes.

  10. Fluidized wall for protecting fusion chamber walls

    DOE Patents [OSTI]

    Maniscalco, James A. (Danville, CA); Meier, Wayne R. (Livermore, CA)

    1982-01-01

    Apparatus for protecting the inner wall of a fusion chamber from microexplosion debris, x-rays, neutrons, etc. produced by deuterium-tritium (DT) targets imploded within the fusion chamber. The apparatus utilizes a fluidized wall similar to a waterfall comprising liquid lithium or solid pellets of lithium-ceramic, the waterfall forming a blanket to prevent damage of the structural materials of the chamber.

  11. Internal combustion engine with rotary combustion chamber

    SciTech Connect (OSTI)

    Hansen, C.N.; Cross, P.C.

    1986-09-23

    This patent describes an internal combustion engine comprising: a block having at least one cylindrical wall surrounding a piston chamber, piston means located in the piston chamber means operable to reciprocate the piston means in the chamber, head means mounted on the block covering the chamber. The head means has an air and fuel intake passage, and exhaust gas passage, a rotary valve assembly operatively associated with the head means for controlling the flow of air and fuel into the rotary valve assembly and piston chamber and the flow of exhaust gas from rotary valve assembly and the piston chamber. The means has a housing with a bore open to the piston chamber accommodating the rotary valve assembly, the valve assembly comprising a cylindrical sleeve located in the bore, the sleeve having an inner surface, an ignition hole, and intake and exhaust ports aligned with the intake passage and exhaust gas passage, spark generating means mounted on the housing operable to generate a spark. The rotatable valving means is located within the sleeve for controlling the flow of air and fuel into the rotary valve assembly and piston chamber and the flow of exhaust gases out of the rotary valve assembly and piston chamber.

  12. IFE Chamber Technology Testing Program In NIF and Chamber Development Test Plan Mohamed A. Abdou

    E-Print Network [OSTI]

    Abdou, Mohamed

    chamber technology testing program in NIF involoving: criteria for evaluation to testing in ignition facility serves a critical role in chamber R&D test plans in order to reduce the risks for chamber technology testing in NIF might not be achievable because its integrated performance is evaluated

  13. meters in CO2 euthanasia chambers. All CO2 euthanasia chambers in both

    E-Print Network [OSTI]

    George, Edward I.

    meters in CO2 euthanasia chambers. All CO2 euthanasia chambers in both the facilities, and durable flow meter to install in all of the CO2 chambers in all of the vivaria. When a specific model and laboratories will need flow meters. ULAR is currently in the process of identifying a cost-effective, accurate

  14. Blogs Are Echo Chambers: Blogs Are Echo Chambers Eric Gilbert, Tony Bergstrom and Karrie Karahalios

    E-Print Network [OSTI]

    Karahalios, Karrie G.

    Blogs Are Echo Chambers: Blogs Are Echo Chambers Eric Gilbert, Tony Bergstrom and Karrie Karahalios decade, blogs have exploded in number, popularity and scope. However, many commentators and researchers speculate that blogs isolate readers in echo chambers, cutting them off from dissenting opin- ions. Our

  15. Proceedings of the Workshop on Radiation Damage to Wire Chambers

    E-Print Network [OSTI]

    Kadyk, J.A.

    2010-01-01

    from chamber cleaning, outgassing from elastomers or otherTPC -- perhaps by normal outgassing and perhaps by reactionproperites and low outgassing. WIRE CHAMBER DEGRADATION AT

  16. ON THE ANALYSIS OF BUBBLE CHAMBER TRACKS Bradner, H.; Solmitz...

    Office of Scientific and Technical Information (OSTI)

    ON THE ANALYSIS OF BUBBLE CHAMBER TRACKS Bradner, H.; Solmitz, F. 08 HYDROGEN; 43 PARTICLE ACCELERATORS; BEVATRON; BUBBLE CHAMBERS; DETECTION; HYDROCARBONS; HYDROGEN; INVENTIONS;...

  17. Formation mechanisms of combustion chamber deposits

    E-Print Network [OSTI]

    O'Brien, Christopher J. (Christopher John)

    2001-01-01

    Combustion chamber deposits are found in virtually all internal combustion engines after a few hundred hours of operation. Deposits form on cylinder, piston, and head surfaces that are in contact with fuel-air mixture ...

  18. Page 6 T H E E N V I R O N M E N TA L F O R U M Managing Water Demand

    E-Print Network [OSTI]

    Shapiro, Benjamin

    as structural solutions, more emphasis on demand-side as well as supply-side management techniques, and a growPage 6 T H E E N V I R O N M E N TA L F O R U M Managing Water Demand: Price vs. Non-price demand management tech- niques." These would include actions such as requiring low-flow fixtures

  19. Main Chamber Pressure why do we care about it?

    E-Print Network [OSTI]

    Pitcher, C. S.

    Main Chamber Pressure why do we care about it? - neutrals in the main chamber imply a particle-surface interaction there which may result in impurity production and erosion - neutrals in the main chamber may.main chamber recycling 3.ion flux to the upper part of the outer plate 4.upper divertor leakage #12

  20. Cosmic Muon Detector Using Proportional Chambers

    E-Print Network [OSTI]

    Dezs? Varga; Zoltán Gál; Gerg? Hamar; Janka Sára Molnár; Éva Oláh; Péter Pázmándi

    2015-07-28

    A set of classical multi-wire proportional chambers were designed and constructed with the main purpose of efficient cosmic muon detection. These detectors are relatively simple to construct, and at the same time are low cost, making them ideal for educational purposes. The detector layers have efficiencies above 99% for minimum ionizing cosmic muons, and their position resolution is about 1 cm, that is, particle trajectories are clearly observable. Visualization of straight tracks is possible using an LED array, with the discriminated and latched signal driving the display. Due to the exceptional operating stability of the chambers, the design can also be used for cosmic muon telescopes.

  1. Reduce Steam Trap Failures at Chambers Works 

    E-Print Network [OSTI]

    Kouba, C.

    2010-01-01

    Failures at Chambers Works GB/BB Name: Cyndi Kouba Mentor/MBB: Andrew Degraff Team Members Michael Crowley(Site Energy Lead), (Charlie) Flanigan (Aramids-maintenance), Ben Snyder (Aramids-ATO), Michael Scruggs (Central Maintenance Mechanic), Rick... is it sustainable HOW we went about finding a solution What do you have learn from this 10/20/2010 3 Six Sigma Methodology was KEY to success Savings: $1MM annualized in only 6 months! 10/20/2010 4Define: Project CTQ?s Customer: Chambers Works site Voice...

  2. Recent Advances in Chamber Science and Technology

    E-Print Network [OSTI]

    California at Los Angeles, University of

    Recent Advances in Chamber Science and Technology Mohamed Abdou April 8, 2002ISFNT-6 San Diego, USA;HYLIFE-II ALPS/APEX NSTX Li module Liquid Wall Science & Technology are being Advanced in Several MFE with Swirl Flow - Fast liquid adheres to back wall by centrifugal force - Applicable to LM's or molten salts

  3. Miniature reaction chamber and devices incorporating same

    DOE Patents [OSTI]

    Mathies, Richard A. (Moraga, CA); Woolley, Adam T. (Albany, CA)

    2000-10-17

    The present invention generally relates to miniaturized devices for carrying out and controlling chemical reactions and analyses. In particular, the present invention provides devices which have miniature temperature controlled reaction chambers for carrying out a variety of synthetic and diagnostic applications, such as PCR amplification, nucleic acid hybridization, chemical labeling, nucleic acid fragmentation and the like.

  4. Mini-PROTEAN Multi-Casting Chamber

    E-Print Network [OSTI]

    Raizada, Manish N.

    Mini-PROTEAN® 3 Multi-Casting Chamber Instruction Manual Catalog Number 165-4110 For Technical components should be cleaned with a suitable laboratory detergent (Bio-Rad's Cleaning Concentrate, catalog number 161-0772), rinsed thoroughly with distilled water, and dried before use. Section 2 Loading

  5. On-Site Wastewater Treatment Systems: Leaching Chambers 

    E-Print Network [OSTI]

    Lesikar, Bruce J.

    2000-02-04

    Leaching chambers distribute treated wastewater into the soil. This publication lists the advantages and disadvantages of leaching chamber systems, explains how to maintain them and gives estimates of costs....

  6. Development of the Captive Aerosol Growth and Evolution Chamber System 

    E-Print Network [OSTI]

    Antonietti, Carlos G

    2014-08-28

    . The reactor cylinder end walls are made of a permeable Teflon membrane for gas exchange between the inside of the chamber and pre- conditioned or filtered ambient gas. This continuous gas exchange permits dynamic control of the chamber composition without...

  7. Gas Injection Apparatus for Vacuum Chamber

    SciTech Connect (OSTI)

    Almabouada, F.; Louhibi, D.; Hamici, M.

    2011-12-26

    We present in this article a gas injection apparatus which comprises the gas injector and its electronic command for vacuum chamber applications. Some of these applications are thin-film deposition by a pulsed laser deposition (PLD) or a cathodic arc deposition (arc-PVD) and the plasma generation. The electronic part has been developed to adjust the flow of the gas inside the vacuum chamber by controlling both of the injector's opening time and the repetition frequency to allow a better gas flow. In this case, the system works either on a pulsed mode or a continuous mode for some applications. In addition, the repetition frequency can be synchronised with a pulsed laser by an external signal coming from the laser, which is considered as an advantage for users. Good results have been obtained using the apparatus and testing with Argon and Nitrogen gases.

  8. Engineering analyses of large precision cathode strip chambers for GEM

    SciTech Connect (OSTI)

    Horvath, J.A.; Belser, F.C.; Pratuch, S.M.; Wuest, C.R. [Lawrence Livermore National Lab., CA (United States)] [Lawrence Livermore National Lab., CA (United States); Mitselmakher, G. [Superconducting Super Collider Lab., Dallas, TX (United States)] [Superconducting Super Collider Lab., Dallas, TX (United States); Gordeev, A. [Institute of Theoretical and Experimental Physics, Moscow (Russian Federation)] [Institute of Theoretical and Experimental Physics, Moscow (Russian Federation); Johnson, C.V. [Lawrence Livermore National Lab., CA (United States)] [Lawrence Livermore National Lab., CA (United States); [Superconducting Super Collider Lab., Dallas, TX (United States); Polychronakos, V.A. [Brookhaven National Lab., Upton, NY (United States)] [Brookhaven National Lab., Upton, NY (United States); Golutvin, I.A. [Joint Institute for Nuclear Research, Dubna (Russian Federation)] [Joint Institute for Nuclear Research, Dubna (Russian Federation)

    1993-10-21

    Structural analyses of large precision cathode strip chambers performed up to the date of this publication are documented. Mechanical property data for typical chamber materials are included. This information, originally intended to be an appendix to the {open_quotes}CSC Structural Design Bible,{close_quotes} is presented as a guide for future designers of large chambers.

  9. Vacuum chamber with a supersonic flow aerodynamic window

    DOE Patents [OSTI]

    Hanson, Clark L. (Livermore, CA)

    1982-01-01

    A supersonic flow aerodynamic window, whereby a steam ejector situated in a primary chamber at vacuum exhausts superheated steam toward an orifice to a region of higher pressure, creating a barrier to the gas in the region of higher pressure which attempts to enter through the orifice. In a mixing chamber outside and in fluid communication with the primary chamber, superheated steam and gas are combined into a mixture which then enters the primary chamber through the orifice. At the point of impact of the ejector/superheated steam and the incoming gas/superheated steam mixture, a barrier is created to the gas attempting to enter the ejector chamber. This barrier, coupled with suitable vacuum pumping means and cooling means, serves to keep the steam ejector and primary chamber at a negative pressure, even though the primary chamber has an orifice to a region of higher pressure.

  10. Vacuum chamber with a supersonic-flow aerodynamic window

    DOE Patents [OSTI]

    Hanson, C.L.

    1980-10-14

    A supersonic flow aerodynamic window is disclosed whereby a steam ejector situated in a primary chamber at vacuum exhausts superheated steam toward an orifice to a region of higher pressure, creating a barrier to the gas in the region of higher pressure which attempts to enter through the orifice. In a mixing chamber outside and in fluid communication with the primary chamber, superheated steam and gas are combined into a mixture which then enters the primary chamber through the orifice. At the point of impact of the ejector/superheated steam and the incoming gas/superheated steam mixture, a barrier is created to the gas attempting to enter the ejector chamber. This barrier, coupled with suitable vacuum pumping means and cooling means, serves to keep the steam ejector and primary chamber at a negative pressure, even though the primary chamber has an orifice to a region of higher pressure.

  11. The electronics of ALICE Dimuon tracking chambers

    E-Print Network [OSTI]

    Chambert, V

    2008-01-01

    The muon spectrometer is one of the main detection system of ALICE, the dedicated heavy-ion experiment at CERN LHC. The muon tracking system consists of five cathodepad chamber station (ST) with two detection planes each. The readout architecture, based on dedicated FE boards, embedded digital crates and a trigger dispatcher crate and the process to reach the electronics final design will be described, as well as the production and the tests of the 19.600 FE boards. Finally, the integration of ST1 at CERN (including EMC issues and commissioning) will be highlighted.

  12. Vacuum chamber for containing particle beams

    DOE Patents [OSTI]

    Harvey, A.

    1985-11-26

    A vacuum chamber for containing a charged particle beam in a rapidly changing magnetic environment comprises a ceramic pipe with conducting strips oriented along the longitudinal axis of the pipe and with circumferential conducting bands oriented perpendicular to the longitudinal axis but joined with a single longitudinal electrical connection. When both strips and bands are on the outside of the ceramic pipe, insulated from each other, a high-resistance conductive layer such as nickel can be coated on the inside of the pipe.

  13. Sandia National Laboratories: Mode Stirred Chamber

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust, High-ThroughputUpcoming Release of thePrograms:Mode Stirred Chamber The Mode Stirred

  14. May 31-June 1, 2001 A. R. Raffray, et al., Assessment of Dry Chamber Walls as Preliminary Step in Defining Key Processes for Chamber Clearing Code 1

    E-Print Network [OSTI]

    Raffray, A. René

    in Defining Key Processes for Chamber Clearing Code 3 Outline of Presentation · Chamber Wall Options ­ Thermal in Defining Key Processes for Chamber Clearing Code 7 Temporal Distribution of Energy Depositions from Photons in Defining Key Processes for Chamber Clearing Code 1 Assessment of Dry Chamber Wall Configurations

  15. Dielectric liquid ionization chambers for detecting fast neutrons

    E-Print Network [OSTI]

    Boyd, Erin M

    2008-01-01

    Three ionization chambers with different geometries have been constructed and filled with dielectric liquids for detection of fast neutrons. The three dielectric liquids studied were Tetramethylsilane (TMS), Tetramethylpentane ...

  16. Donald Glaser, the Bubble Chamber, and Elementary Particles

    Office of Scientific and Technical Information (OSTI)

    construction of computational models that shed light on the physics and physiology of human perception." - Edited excerpt from: 1960: Donald Glaser and His Bubble Chamber,...

  17. Quantum combustion chamber for the digital engine

    SciTech Connect (OSTI)

    Evers, L.W.; Baasch, V.

    1985-01-01

    For increasing fuel economy and reducing hydrocarbon emissions, a two-stoke-cycle, loop-scavenged single cylinder engine was modified by replacing the head with a head having three subchambers and incorporating a distributing pump fuel injection system. The fuel injection system allowed one subchamber to be operated at a time. The quantum combustion system demonstrated both lower fuel consumption and lower hydrocarbon emissions than a conventional homogeneous charge engine. The experimental evidence also indicates that the combustion essentially occurred in the one chamber into which fuel was injected. Establishing stratified charge combustion by mechanically separating the regions of air from the regions of air/fuel mixtures by means of subchambers is feasible.

  18. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    Magnetism in a Pinch Scientists have long known that if you squeeze certain materials, their properties change. One phenomenon, called the piezoelectric effect, is...

  19. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptions | National NuclearProbing Organic TransistorsProbing

  20. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptions | National NuclearProbing Organic

  1. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptions | National NuclearProbing OrganicProbing Strain-Induced

  2. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptions | National NuclearProbing OrganicProbing

  3. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptions | National NuclearProbing OrganicProbingProbing

  4. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass mapSpeedingProgramExemptions | National NuclearProbing OrganicProbingProbingProbing

  5. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) by Carbon-Rich Matrices inPrincipalFirm Exchange . . . .Techniques

  6. Probing Strain-Induced Changes in Electronic Structure with XMCD

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home RoomPreservation of Fe(II) by Carbon-Rich Matrices inPrincipalFirm Exchange . . . .TechniquesProbing

  7. Make Music with The Boston College Chamber Music Society!

    E-Print Network [OSTI]

    Huang, Jianyu

    Make Music with The Boston College Chamber Music Society! The BC Chamber Music Society is the umbrella organization for most small ensembles based in the Music Department, and includes instrumentalists to provide music for various university functions. All members of the BC community are welcome to audition

  8. A Proportional Wire Chamber Array: GRAND's Status

    E-Print Network [OSTI]

    J. Poirier; C. D'Andrea; M. Lopez del Puerto; E. Strahler; J. Vermedahl

    2003-06-18

    Project GRAND is a 100m x 100m air shower array of position sensitive proportional wire chambers (PWCs) located at 41.7 degrees North and 86.2 degrees West at an elevation of 220m above sea level. Its convenient location adjacent to the campus of the University of Notre Dame makes it a good training ground for students. There are 64 stations each with eight 1.29 m^2 PWCs. The geometry of the stations allows for the angles of charged secondaries to be determined to within 0.26 degrees in each of two orthogonal planes; muons are differentiated from electrons and hadrons by means of a steel plate. Two triggers are run simultaneously: a multiple hit coincidence trigger, rich in extensive air showers, and a single track trigger, rich in secondary muon tracks. The former trigger is sensitive to primary energies greater than ~100 TeV, the latter to energies greater than ~10 GeV.

  9. Vacuum chamber for ion manipulation device

    DOE Patents [OSTI]

    Chen, Tsung-Chi; Tang, Keqi; Ibrahim, Yehia M; Smith, Richard D; Anderson, Gordon A; Baker, Erin M

    2014-12-09

    An ion manipulation method and device is disclosed. The device includes a pair of substantially parallel surfaces. An array of inner electrodes is contained within, and extends substantially along the length of, each parallel surface. The device includes a first outer array of electrodes and a second outer array of electrodes. Each outer array of electrodes is positioned on either side of the inner electrodes, and is contained within and extends substantially along the length of each parallel surface. A DC voltage is applied to the first and second outer array of electrodes. A RF voltage, with a superimposed electric field, is applied to the inner electrodes by applying the DC voltages to each electrode. Ions either move between the parallel surfaces within an ion confinement area or along paths in the direction of the electric field, or can be trapped in the ion confinement area. A predetermined number of pairs of surfaces are disposed in one or more chambers, forming a multiple-layer ion mobility cyclotron device.

  10. Paint coatings: Controlled field and chamber experiments

    SciTech Connect (OSTI)

    Edney, E.O.

    1989-04-01

    To determine the impact of pollution levels on the weathering rates of coatings, laboratory chamber experiments and controlled field exposures at North Carolina and Ohio sites were conducted in such a manner to separate the contributions due to dry deposition, wet deposition, precipitation pH, etc. The results of these studies confirm that acidic gases such as SO/sub 2/ and HNO/sub 3/, as well as acids within rain, promote the dissolution of alkaline components including CaCO/sub 3/, ZnO, and Al flake from paint films. It is unclear from these studies whether the removal of these components reduces the service life or protective properties of the paint film. Other researchers within the Coatings Effects Program are conducting subsequent analyses to determine micro-damage of these paints. The uptake of acidic gases to painted surfaces is a complex process that depends on several factors. The deposition rate of SO/sub 2/ to a wet, painted surface may be controlled by the level of oxidants such as H/sub 2/O/sub 2/.

  11. October 24, 2001 1. Remaining Action Items on Dry Chamber Wall

    E-Print Network [OSTI]

    Raffray, A. René

    and chamber wall design · Power to chamber wall · Coolant outlet temperature · Cycle efficiency · Thermal-hydraulic parameters · Maximum temperature of chamber wall - Chamber wall power assumed to be spread over the completeOctober 24, 2001 1 1. Remaining Action Items on Dry Chamber Wall 2. "Overlap" Design Regions 3

  12. Turbine component cooling channel mesh with intersection chambers

    DOE Patents [OSTI]

    Lee, Ching-Pang; Marra, John J

    2014-05-06

    A mesh (35) of cooling channels (35A, 35B) with an array of cooling channel intersections (42) in a wall (21, 22) of a turbine component. A mixing chamber (42A-C) at each intersection is wider (W1, W2)) than a width (W) of each of the cooling channels connected to the mixing chamber. The mixing chamber promotes swirl, and slows the coolant for more efficient and uniform cooling. A series of cooling meshes (M1, M2) may be separated by mixing manifolds (44), which may have film cooling holes (46) and/or coolant refresher holes (48).

  13. Carrying Semiautomatic Pistols with a Round in the Chamber

    Broader source: Directives, Delegations, and Requirements [Office of Management (MA)]

    1999-10-28

    Sets forth requirements for a DOE security police officer who must carry a round in the chamber of a semiautomatic pistol while on duty. Does not cancel other directives.

  14. Neutral Gas Expansion in a Cylindrical Helicon Discharge Chamber

    E-Print Network [OSTI]

    Walker, Mitchell

    ­1500 G) magnetic field parallel to the axis of the tube. In many helicon experiments for basic plasma research, the discharge chamber is composed of a small diameter (2­10 cm), relatively long (0.5­1.75 m

  15. Effects of outgassing of loader chamber walls on hydriding of...

    Office of Scientific and Technical Information (OSTI)

    gas pressure. Complete process data for (1) a copper-(1.83 wt. %)beryllium wet hydrogen fired passivated (600 C-1 h) externally heated pipe hydriding chamber are reported....

  16. E-Cloud Build-up in Grooved Chambers

    E-Print Network [OSTI]

    Venturini, Marco

    2007-01-01

    and F. Zimmermann, ”LC e-Cloud Activities at CERN”, talkal. , Simulations of the Electron Cloud for Vari- ous Con?E-CLOUD BUILD-UP IN GROOVED CHAMBERS ? M. Venturini † LBNL,

  17. Laser calibration system for the CERES Time Projection Chamber

    E-Print Network [OSTI]

    Dariusz Miskowiec; Peter Braun-Munzinger

    2008-02-15

    A Nd:YAG laser was used to simulate charged particle tracks at known positions in the CERES Time Projection Chamber at the CERN SPS. The system was primarily developed to study the response of the readout electronics and to calibrate the electron drift velocity. Further applications were the determination of the gating grid transparency, the chamber position calibration, and long-term monitoring of drift properties of the gas in the detector.

  18. Dark matter limits froma 15 kg windowless bubble chamber

    SciTech Connect (OSTI)

    Szydagis, Matthew Mark; /Chicago U.

    2010-12-01

    The COUPP collaboration has successfully used bubble chambers, a technology previously applied only to high-energy physics experiments, as direct dark matter detectors. It has produced the world's most stringent spin-dependent WIMP limits, and increasingly competitive spin-independent limits. These limits were achieved by capitalizing on an intrinsic rejection of the gamma background that all other direct detection experiments must address through high-density shielding and empirically-determined data cuts. The history of COUPP, including its earliest prototypes and latest results, is briefly discussed in this thesis. The feasibility of a new, windowless bubble chamber concept simpler and more inexpensive in design is discussed here as well. The dark matter limits achieved with a 15 kg windowless chamber, larger than any previous COUPP chamber (2 kg, 4 kg), are presented. Evidence of the greater radiopurity of synthetic quartz compared to natural is presented using the data from this 15 kg device, the first chamber to be made from synthetic quartz. The effective reconstruction of the three-dimensional positions of bubbles in a highly distorted optical field, with ninety-degree bottom lighting similar to cloud chamber lighting, is demonstrated. Another innovation described in this thesis is the use of the sound produced by bubbles recorded by an array of piezoelectric sensors as the primary means of bubble detection. In other COUPP chambers, cameras have been used as the primary trigger. Previous work on bubble acoustic signature differentiation using piezos is built upon in order to further demonstrate the ability to discriminate between alpha- and neutron-induced events.

  19. A large dynamic chamber for characterizing particulate and VOC emissions

    SciTech Connect (OSTI)

    Lawless, P.A.; Smith, D.D.; Ensor, D.S. [Research Triangle Inst., Research Triangle Park, NC (United States); Sparks, L.E. [Environmental Protection Agency, Research Triangle Park, NC (United States). Air and Energy Engineering Research Lab.

    1996-12-31

    A dynamic chamber (8 m{sup 3}) was designed and constructed for the investigation of particulate emissions from appliances and office equipment and their impact on indoor air quality. The supply air incorporated high efficiency particle filters to provide a near-zero particle background in a low turbulence flow. The flow rate could be varied from 2 to 80 m{sup 3}/min. For testing operating appliances, such as vacuum cleaners, the dimensions of the chamber were chosen to allow an operator to use an appliance over a floor area of about 2 m{sup 2}. The need for low particle backgrounds dictated that the chamber be operated in an overpressure mode, so that all leaks were from the inside and would only affect the total flow measurements. The flow converges into an outlet tube 20 cm in diameter where velocity and concentration measurements could be made in multiple ports. The chamber was furnished with interior lights and electrical outlets. Recently, the chamber has been modified with carbon filters on the inlet to allow for sampling of volatile organic compounds (VOCs), such as from floor wax. The filters remove the VOC background to a level below that detectable by the sorbent cartridges/analysis system used for sampling. The chamber has even been pressed into service as a small cleanroom for some operations that required its unique characteristics. The chamber has been successfully operated in both a closed-loop mode and in an open-loop mode. The main advantage of the closed loop mode is that the backgrounds can be reduced to zero more quickly, but the disadvantage is that humidity and carbon dioxide concentrations grow because they are not removed by the filters.

  20. Fig.1a. Schematic picture of ITER tokamak, showing the toroidal main chamber,

    E-Print Network [OSTI]

    Lin, Zhihong

    Fig.1a. Schematic picture of ITER tokamak, showing the toroidal main chamber, material wall, and the small divertor chamber at the bottom of the main chamber Gyrokinetic particle simulation of neoclassical and b). The wall plates in the divertor chamber are periodically replaced, giving the main wall a much

  1. Initial Back-to-Back Fission Chamber Testing in ATRC

    SciTech Connect (OSTI)

    Benjamin Chase; Troy Unruh; Joy Rempe

    2014-06-01

    Development and testing of in-pile, real-time neutron sensors for use in Materials Test Reactor experiments is an ongoing project at Idaho National Laboratory. The Advanced Test Reactor National Scientific User Facility has sponsored a series of projects to evaluate neutron detector options in the Advanced Test Reactor Critical Facility (ATRC). Special hardware was designed and fabricated to enable testing of the detectors in the ATRC. Initial testing of Self-Powered Neutron Detectors and miniature fission chambers produced promising results. Follow-on testing required more experiment hardware to be developed. The follow-on testing used a Back-to-Back fission chamber with the intent to provide calibration data, and a means of measuring spectral indices. As indicated within this document, this is the first time in decades that BTB fission chambers have been used in INL facilities. Results from these fission chamber measurements provide a baseline reference for future measurements with Back-to-Back fission chambers.

  2. Inertial confinement fusion reaction chamber and power conversion system study

    SciTech Connect (OSTI)

    Maya, I.; Schultz, K.R.; Battaglia, J.M.; Buksa, J.J.; Creedson, R.L.; Erlandson, O.D.; Levine, H.E.; Roelant, D.F.; Sanchez, H.W.; Schrader, S.A.

    1984-09-01

    GA Technologies has developed a conceptual ICF reactor system based on the Cascade rotating-bed reaction chamber concept. Unique features of the system design include the use of low activation SiC in a reaction chamber constructed of box-shaped tiles held together in compression by prestressing tendons to the vacuum chamber. Circulating Li/sub 2/O granules serve as the tritium breeding and energy transport material, cascading down the sides of the reaction chamber to the power conversion system. The total tritium inventory of the system is 6 kg; tritium recovery is accomplished directly from the granules via the vacuum system. A system for centrifugal throw transport of the hot Li/sub 2/O granules from the reaction chamber to the power conversion system has been developed. A number of issues were evaluated during the course of this study. These include the response of first-layer granules to the intense microexplosion surface heat flux, cost effective fabrication of Li/sub 2/O granules, tritium inventory and recovery issues, the thermodynamics of solids-flow options, vacuum versus helium-medium heat transfer, and the tradeoffs of capital cost versus efficiency for alternate heat exchange and power conversion system option. The resultant design options appear to be economically competitive, safe, and environmentally attractive.

  3. Atmosphere contamination following repainting of a human hyperbaric chamber complex

    SciTech Connect (OSTI)

    Lillo, R.S.; Morris, J.W.; Caldwell, J.M.; Balk, D.M.; Flynn, E.T. )

    1990-09-01

    The Naval Medical Research Institute currently conducts hyperbaric research in a Man-Rated Chamber Complex (MRCC) originally installed in 1977. Significant engineering alterations to the MRCC and rusting of some of its interior sections necessitated repainting, which was completed in 1988. Great care was taken in selecting an appropriate paint (polyamide epoxy) and in ensuring correct application and curing procedures. Only very low levels of hydrocarbons were found in the MRCC atmosphere before initial pressurization after painting and curing. After pressurization, however, significant chemical contamination was found. The primary contaminants were aromatic hydrocarbons: xylenes (which were a major component of both the primer and topcoat paint) and ethyl benzene. The role that pressure played in stimulating off-gassing from the paint is not clear; the off-gassing rate was observed to be similar over a large range in chamber pressures from 1.6 to 31.0 atm abs. Scrubbing the chamber atmosphere with the chemical absorbent Purafil was effective in removing the contaminants. Contamination has been observed to slowly decline with chamber use and is expected to continue to improve with time. However, this contamination experience emphasizes the need for a high precision gas analysis program at any diving facility to ensure the safety of the breathing gas and chamber atmosphere.

  4. Extreme-UV lithography vacuum chamber zone seal

    DOE Patents [OSTI]

    Haney, Steven J. (Tracy, CA); Herron, Donald Joe (Manteca, CA); Klebanoff, Leonard E. (San Ramon, CA); Replogle, William C. (Livermore, CA)

    2001-01-01

    Control of particle contamination on the reticle and carbon contamination of optical surfaces in photolithography systems can be achieved by the establishment of multiple pressure zones in the photolithography systems. The different zones will enclose the reticle, projection optics, wafer, and other components of system. The system includes a vacuum apparatus that includes: a housing defining a vacuum chamber; one or more metrology trays situated within the vacuum chamber each of which is supported by at least one support member, wherein the tray separates the vacuum chamber into a various compartments that are maintained at different pressures; and conductance seal devices for adjoining the perimeter of each tray to an inner surface of the housing wherein the tray is decoupled from vibrations emanating from the inner surface of the housing.

  5. Extreme-UV lithography vacuum chamber zone seal

    DOE Patents [OSTI]

    Haney, Steven J. (Tracy, CA); Herron, Donald Joe (Manteca, CA); Klebanoff, Leonard E. (San Ramon, CA); Replogle, William C. (Livermore, CA)

    2003-04-15

    Control of particle contamination on the reticle and carbon contamination of optical surfaces in photolithography systems can be achieved by the establishment of multiple pressure zones in the photolithography systems. The different zones will enclose the reticle, projection optics, wafer, and other components of system. The system includes a vacuum apparatus that includes: a housing defining a vacuum chamber; one or more metrology trays situated within the vacuum chamber each of which is supported by at least one support member, wherein the tray separates the vacuum chamber into a various compartments that are maintained at different pressures; and conductance seal devices for adjoining the perimeter of each tray to an inner surface of the housing wherein the tray is decoupled from vibrations emanating from the inner surface of the housing.

  6. Extreme-UV lithography vacuum chamber zone seal

    DOE Patents [OSTI]

    Haney, Steven J. (Tracy, CA); Herron, Donald Joe (Manteca, CA); Klebanoff, Leonard E. (San Ramon, CA); Replogle, William C. (Livermore, CA)

    2003-04-08

    Control of particle contamination on the reticle and carbon contamination of optical surfaces in photolithography systems can be achieved by the establishment of multiple pressure zones in the photolithography systems. The different zones will enclose the reticle, projection optics, wafer, and other components of system. The system includes a vacuum apparatus that includes: a housing defining a vacuum chamber; one or more metrology trays situated within the vacuum chamber each of which is supported by at least one support member, wherein the tray separates the vacuum chamber into a various compartments that are maintained at different pressures; and conductance seal devices for adjoining the perimeter of each tray to an inner surface of the housing wherein the tray is decoupled from vibrations emanating from the inner surface of the housing.

  7. Chamber Design for the Laser Inertial Fusion Energy (LIFE) Engine

    SciTech Connect (OSTI)

    Latkowski, J F; Abbott, R P; Aceves, S; Anklam, T; Badders, D; Cook, A W; DeMuth, J; Divol, L; El-Dasher, B; Farmer, J C; Flowers, D; Fratoni, M; ONeil, R G; Heltemes, T; Kane, J; Kramer, K J; Kramer, R; Lafuente, A; Loosmore, G A; Morris, K R; Moses, G A; Olson, B; Pantano, C; Reyes, S; Rhodes, M; Roe, K; Sawicki, R; Scott, H; Spaeth, M; Tabak, M; Wilks, S

    2010-11-30

    The Laser Inertial Fusion Energy (LIFE) concept is being designed to operate as either a pure fusion or hybrid fusion-fission system. The present work focuses on the pure fusion option. A key component of a LIFE engine is the fusion chamber subsystem. It must absorb the fusion energy, produce fusion fuel to replace that burned in previous targets, and enable both target and laser beam transport to the ignition point. The chamber system also must mitigate target emissions, including ions, x-rays and neutrons and reset itself to enable operation at 10-15 Hz. Finally, the chamber must offer a high level of availability, which implies both a reasonable lifetime and the ability to rapidly replace damaged components. An integrated design that meets all of these requirements is described herein.

  8. QER- Comment of PA Chamber of Business and Industry

    Office of Energy Efficiency and Renewable Energy (EERE)

    On behalf of Gene Barr, President & CEO of the Pennsylvania Chamber of Business and Industry, please find attached our comments regarding Natural Gas Transmission, Storage & Distribution, Pittsburgh, Pennsylvania July 21, 2014. Thanks in advance for the attention to our comments and for holding a hearing today in our state. All the best, Kevin

  9. Thermodynamic Analysis of a single chamber Microbial Eric A. Zielke

    E-Print Network [OSTI]

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 #12;Microbial Fuel Cell Zielke 1 1 Introduction Renewable energy (RE) applications are becomingThermodynamic Analysis of a single chamber Microbial Fuel Cell Eric A. Zielke May 5, 2006 #12;Microbial Fuel Cell Zielke ii List of Tables 1 First Law Thermodynamic Efficiencies from Experimental Data

  10. Hydrogen Production in a Single Chamber Microbial Electrolysis Cell

    E-Print Network [OSTI]

    Hydrogen Production in a Single Chamber Microbial Electrolysis Cell Lacking a Membrane D O U G L 7, 2008. Hydrogen gas can be produced by electrohydrogenesis in microbial electrolysis cells (MECs assumed that a membrane is needed in an MEC to avoid hydrogen losses due to bacterial consumption

  11. Passivity Based Adaptive Control of a Two Chamber Single Rod Hydraulic Actuator

    E-Print Network [OSTI]

    Li, Perry Y.

    Passivity Based Adaptive Control of a Two Chamber Single Rod Hydraulic Actuator Meng Wang and Perry based backstepping controller using a physical compressibility energy function for a chamber hydraulic produces an accurate trajectory tracking performance. I. INTRODUCTION Electronically controlled hydraulic

  12. The Laser Calibration System of the ALICE Time Projection Chamber

    E-Print Network [OSTI]

    G. Renault; B. S. Nielsen; J. Westergaard; J. J. Gaardhøje

    2005-11-07

    A Large Ion Collider Experiment (ALICE) is the only experiment at the Large Hadron Collider (LHC) dedicated to the study of heavy ion collisions. The Time Projection Chamber (TPC) is the main tracking detector covering the pseudo rapidity range $|\\eta|laser system is to simulate ionizing tracks at predifined positions throughout the drift volume in order to monitor the TPC response to a known source. In particular, the alignment of the read-out chambers will be performed, and variations of the drift velocity due to drift field imperfections can be measured and used as calibration data in the physics data analysis. In this paper we present the design of the pulsed UV laser and optical system, together with the control and monitoring systems.

  13. Chamber for the optical manipulation of microscopic particles

    DOE Patents [OSTI]

    Buican, Tudor N. (Los Alamos, NM); Upham, Bryan D. (Los Alamos, NM)

    1992-01-01

    A particle control chamber enables experiments to be carried out on biological cells and the like using a laser system to trap and manipulate the particles. A manipulation chamber provides a plurality of inlet and outlet ports for the particles and for fluids used to control or to contact the particles. A central manipulation area is optically accessible by the laser and includes first enlarged volumes for containing a selected number of particles for experimentation. A number of first enlarged volumes are connected by flow channels through second enlarged volumes. The second enlarged volumes act as bubble valves for controlling the interconnections between the first enlarged volumes. Electrode surfaces may be applied above the first enlarged volumes to enable experimentation using the application of electric fields within the first enlarged volumes. A variety of chemical and environmental conditions may be established within individual first enlarged volumes to enable experimental conditions for small scale cellular interactions.

  14. Using sputter coated glass to stabilize microstrip gas chambers

    DOE Patents [OSTI]

    Gong, Wen G. (Albany, CA)

    1997-01-01

    By sputter coating a thin-layer of low-resistive, electronically-conductive glass on various substrates (including quartz and ceramics, thin-film Pestov glass), microstrip gas chambers (MSGC) of high gain stability, low leakage current, and a high rate capability can be fabricated. This design can make the choice of substrate less important, save the cost of ion-implantation, and use less glass material.

  15. Development of a time projection chamber with micro pixel electrodes

    E-Print Network [OSTI]

    H. Kubo; K. Miuchi; T. Nagayoshi; A. Ochi; R. Orito; A. Takada; T. Tanimori; M. Ueno

    2003-01-09

    A time projection chamber (TPC) based on a gaseous chamber with micro pixel electrodes (micro-PIC) has been developed for measuring three-dimensional tracks of charged particles. The micro-PIC with a detection area of 10 cm square consists of a double-sided printing circuit board. Anode pixels are formed with 0.4 mm pitch on strips aligned perpendicular to the cathode strips in order to obtain a two-dimensional position. In the TPC with drift length of 8 cm, 4 mm wide field cage electrodes are aligned at 1mm spaces and a uniform electric field of about 0.4 kV/cm is produced. For encoding of the three-dimensional position a synchronous readout system has been developed using Field Programmable Gate Arrays with 40 MHz clock. This system enables us to reconstruct the three-dimensional track of the particle at successive points like a cloud chamber even at high event rate. The drift velocity of electrons in the TPC was measured with the tracks of cosmic muons for three days, during which the TPC worked stably with the gas gain of 3000. With a radioisotope of gamma-ray source the three-dimensional track of a Compton scattered electron was taken successfully.

  16. Compensation for the Eddy Current Effect in the APS Storage Ring Vacuum Chamber

    E-Print Network [OSTI]

    Kemner, Ken

    Compensation for the Eddy Current Effect in the APS Storage Ring Vacuum Chamber Y. Chung Abstract inside the APS storage ring vacuum chamber due to the eddy current effect were measured. A circuit of the correction magnet field, externally applied to the vac- uum chamber, induces eddy current inside the aluminum

  17. Explicit Representation of Main-Chamber Recycling in the OEDGE Boundary Code

    E-Print Network [OSTI]

    Stangeby, P. C.

    Explicit Representation of Main-Chamber Recycling in the OEDGE Boundary Code S. LISGO, P contact occurs with the main chamber walls, additional to the divertor target. In order to investigate the role of main chamber recycling on core fuelling and impurity behavior, the OSM-EIRENE- DIVIMP (OEDGE

  18. A study of the polyethylene membrane used in diffusion chambers for radon gas concentration measurements

    E-Print Network [OSTI]

    Yu, Peter K.N.

    A study of the polyethylene membrane used in diffusion chambers for radon gas concentration. Thoron can also be deterred from entering the diffusion chamber by using a polyethylene (PE) membrane rights reserved. PACS: 29.40; 23.60 Keywords: Diffusion chamber; Polyethylene membrane; Radon and thoron

  19. Recent advances in single-chamber fuel-cells: Experiment and modeling , Zongping Shao b

    E-Print Network [OSTI]

    Haile, Sossina M.

    Recent advances in single-chamber fuel-cells: Experiment and modeling Yong Hao a , Zongping Shao b; accepted 6 May 2006 Abstract Single-chamber fuel cells (SCFC) are ones in which the fuel and oxidizer is discussed. © 2006 Elsevier B.V. All rights reserved. Keywords: Solid oxide fuel cell; Single chamber

  20. Dual chamber system providing simultaneous etch and deposition on opposing substrate sides for growing low defect density epitaxial layers

    DOE Patents [OSTI]

    Kulkarni, Nagraj S. (Knoxville, TN); Kasica, Richard J. (Ashburn, VA) ,

    2011-03-08

    A dual-chamber reactor can include a housing enclosing a volume having a divider therein, where the divider defines a first chamber and a second chamber. The divider can include a substrate holder that supports at least one substrate and exposes a first side of the substrate to the first chamber and a second side of the substrate to the second chamber. The first chamber can include an inlet for delivering at least one reagent to the first chamber for forming a film on the first side of the substrate, and the second chamber can include a removal device for removing material from the second side of the substrate.

  1. Construction and test of MDT chambers for the ATLAS muon spectrometer

    E-Print Network [OSTI]

    Bauer, F; Dietl, H; Kroha, H; Lagouri, T; Manz, A; Ostapchuk, A Ya; Richter, R; Schael, S; Chouridou, S; Deile, M; Kortner, O; Staude, A; Ströhmer, R; Trefzger, T M

    2001-01-01

    The Monitored Drift Tube (MDT) chambers for the muon spectrometer of the ATLAS detector at the Large Hadron Collider (LHC) consist of 3-4 layers of pressurized drift tubes on either side ofa space frame carrying an optical monitoring system to correct fordeformations. The full-scale prototype of a large MDT chamber has been constructed with methods suitable for large-scale production. X-ray measurements at CERN showed a positioning accuracy of the sense wires in the chamber of better than the required 20 micrometers (rms). The performance of the chamber was studied in a muon beam at CERN. Chamber production for ATLAS now has started.

  2. Performance parameters of a liquid filled ionization chamber array

    SciTech Connect (OSTI)

    Poppe, B.; Stelljes, T. S.; Looe, H. K.; Chofor, N.; Harder, D.; Willborn, K.

    2013-08-15

    Purpose: In this work, the properties of the two-dimensional liquid filled ionization chamber array Octavius 1000SRS (PTW-Freiburg, Germany) for use in clinical photon-beam dosimetry are investigated.Methods: Measurements were carried out at an Elekta Synergy and Siemens Primus accelerator. For measurements of stability, linearity, and saturation effects of the 1000SRS array a Semiflex 31013 ionization chamber (PTW-Freiburg, Germany) was used as a reference. The effective point of measurement was determined by TPR measurements of the array in comparison with a Roos chamber (type 31004, PTW-Freiburg, Germany). The response of the array with varying field size and depth of measurement was evaluated using a Semiflex 31010 ionization chamber as a reference. Output factor measurements were carried out with a Semiflex 31010 ionization chamber, a diode (type 60012, PTW-Freiburg, Germany), and the detector array under investigation. The dose response function for a single detector of the array was determined by measuring 1 cm wide slit-beam dose profiles and comparing them against diode-measured profiles. Theoretical aspects of the low pass properties and of the sampling frequency of the detector array were evaluated. Dose profiles measured with the array and the diode detector were compared, and an intensity modulated radiation therapy (IMRT) field was verified using the Gamma-Index method and the visualization of line dose profiles.Results: The array showed a short and long term stability better than 0.1% and 0.2%, respectively. Fluctuations in linearity were found to be within ±0.2% for the vendor specified dose range. Saturation effects were found to be similar to those reported in other studies for liquid-filled ionization chambers. The detector's relative response varied with field size and depth of measurement, showing a small energy dependence accounting for maximum signal deviations of ±2.6% from the reference condition for the setup used. The ?-values of the Gaussian dose response function for a single detector of the array were found to be (0.72 ± 0.25) mm at 6 MV and (0.74 ± 0.25) mm at 15 MV and the corresponding low pass cutoff frequencies are 0.22 and 0.21 mm{sup ?1}, respectively. For the inner 5 × 5 cm{sup 2} region and the outer 11 × 11 cm{sup 2} region of the array the Nyquist theorem is fulfilled for maximum sampling frequencies of 0.2 and 0.1 mm{sup ?1}, respectively. An IMRT field verification with a Gamma-Index analysis yielded a passing rate of 95.2% for a 3 mm/3% criterion with a TPS calculation as reference.Conclusions: This study shows the applicability of the Octavius 1000SRS in modern dosimetry. Output factor and dose profile measurements illustrated the applicability of the array in small field and stereotactic dosimetry. The high spatial resolution ensures adequate measurements of dose profiles in regular and intensity modulated photon-beam fields.

  3. Nov 13-14, 2001 A. R. Raffray, et al., Progress Report on Chamber Clearing Code Effort 1 Progress Report on Chamber Clearing Code

    E-Print Network [OSTI]

    Raffray, A. René

    Nov 13-14, 2001 A. R. Raffray, et al., Progress Report on Chamber Clearing Code Effort 1 Progress Livermore November 13-14, 2001 #12;Nov 13-14, 2001 A. R. Raffray, et al., Progress Report on Chamber.g. - CFDRC - HEIGHTS - RECON · Code implementation and integration of packages #12;Nov 13-14, 2001 A. R

  4. Statistics of the electromagnetic response of a chaotic reverberation chamber

    E-Print Network [OSTI]

    J. -B. Gros; U. Kuhl; O. Legrand; F. Mortessagne; O. Picon; E. Richalot

    2014-09-20

    This article presents a study of the electromagnetic response of a chaotic reverberation chamber (RC) in the presence of losses. By means of simulations and of experiments, the fluctuations in the maxima of the field obtained in a conventional mode-stirred RC are compared with those in a chaotic RC in the neighborhood of the Lowest Useable Frequency (LUF). The present work illustrates that the universal spectral and spatial statistical properties of chaotic RCs allow to meet more adequately the criteria required by the Standard IEC 61000-4-21 to perform tests of electromagnetic compatibility.

  5. Performance Evaluation of Reverberant Chamber Background Noise Levels 

    E-Print Network [OSTI]

    Ravi, Sankaranarayana

    2012-02-14

    ?higher?octave?bands,? the reby? increasing? the? loudness?of? the? fan.?? For?better?system?design,?it? is?necessary?to?obtain ?the?sound?power?signatures?of?the? fan?in?the?various?octave?bands?rather?than?a?singl e?rating?number?for?sound?power?level.?? Laboratory? fan...?installed?or?a?rotating?boom?microphone?s etup??is?adopted.? 4.2 ? Literature?Review? Table?5?presents? the?survey?of?all? relevant? literat ure?on?reverberant?chamber? testing? with?a?particular?attention?to?sound?power?measurem ent?testing?facilities.? ? ? 15? Ta bl e?5 ???????? Li...

  6. Fuel, lubricant and additive effects in combustion chamber deposit formation

    SciTech Connect (OSTI)

    Kelemen, S.R.; Homan, H.S.

    1996-10-01

    CCD causes octane requirement increase (ORI) and can potentially contributes to exhaust emissions and combustion chamber deposit interference (CCDI). Experiments were conducted to identify the separate fuel, lubricant and additive contributions to the amount and composition of CCD. CCD originates from multiple sources. Gasoline hydrocarbon components, gasoline additives, engine lubricant, and atmospheric nitrogen contribute to CCD in different ways. With some fuels the engine lubricant is the main contributor to CCD and this is shown by the high ash level in the CCD. For other fuels CCD is predominantly organic. Significant amounts of nitrogen were found in the CCD even when the fuel and lubricant were nitrogen free. The pyrolysis reactivity of different CCDs was studied to gain an understanding about the transformations that potentially happen over longer times and lower temperatures on the combustion chamber walls. In all cases during mild pyrolysis (375{degrees}C) there was a substantial increase in the level of aromatic carbon and a decrease in the level of organic oxygen. The largest increases in the amount of aromatic carbon occurred for CCDs that were the least aromatic.

  7. Slag monitoring system for combustion chambers of steam boilers

    SciTech Connect (OSTI)

    Taler, J.; Taler, D.

    2009-07-01

    The computer-based boiler performance system presented in this article has been developed to provide a direct and quantitative assessment of furnace and convective surface cleanliness. Temperature, pressure, and flow measurements and gas analysis data are used to perform heat transfer analysis in the boiler furnace and evaporator. Power boiler efficiency is calculated using an indirect method. The on-line calculation of the exit flue gas temperature in a combustion chamber allows for an on-line heat flow rate determination, which is transferred to the boiler evaporator. Based on the energy balance for the boiler evaporator, the superheated steam mass flow rate is calculated taking into the account water flow rate in attemperators. Comparing the calculated and the measured superheated steam mass flow rate, the effectiveness of the combustion chamber water walls is determined in an on-line mode. Soot-blower sequencing can be optimized based on actual cleaning requirements rather than on fixed time cycles contributing to lowering of the medium usage in soot blowers and increasing of the water-wall lifetime.

  8. Atmospheric-pressure plasma decontamination/sterilization chamber

    DOE Patents [OSTI]

    Herrmann, Hans W. (Los Alamos, NM); Selwyn, Gary S. (Los Alamos, NM)

    2001-01-01

    An atmospheric-pressure plasma decontamination/sterilization chamber is described. The apparatus is useful for decontaminating sensitive equipment and materials, such as electronics, optics and national treasures, which have been contaminated with chemical and/or biological warfare agents, such as anthrax, mustard blistering agent, VX nerve gas, and the like. There is currently no acceptable procedure for decontaminating such equipment. The apparatus may also be used for sterilization in the medical and food industries. Items to be decontaminated or sterilized are supported inside the chamber. Reactive gases containing atomic and metastable oxygen species are generated by an atmospheric-pressure plasma discharge in a He/O.sub.2 mixture and directed into the region of these items resulting in chemical reaction between the reactive species and organic substances. This reaction typically kills and/or neutralizes the contamination without damaging most equipment and materials. The plasma gases are recirculated through a closed-loop system to minimize the loss of helium and the possibility of escape of aerosolized harmful substances.

  9. Wire-chamber radiation detector with discharge control

    DOE Patents [OSTI]

    Perez-Mendez, V.; Mulera, T.A.

    1982-03-29

    A wire chamber; radiation detector has spaced apart parallel electrodes and grids defining an ignition region in which charged particles or other ionizing radiations initiate brief localized avalanche discharges and defining an adjacent memory region in which sustained glow discharges are initiated by the primary discharges. Conductors of the grids at each side of the memory section extend in orthogonal directions enabling readout of the X-Y coordinates of locations at which charged particles were detected by sequentially transmitting pulses to the conductors of one grid while detecting transmissions of the pulses to the orthogonal conductors of the other grid through glow discharges. One of the grids bounding the memory region is defined by an array of conductive elements each of which is connected to the associated readout conductor through a separate resistance. The wire chamber avoids ambiguities and imprecisions in the readout of coordinates when large numbers of simultaneous or; near simultaneous charged particles have been detected. Down time between detection periods and the generation of radio frequency noise are also reduced.

  10. Dose response of selected ion chambers in applied homogeneous transverse and longitudinal magnetic fields

    SciTech Connect (OSTI)

    Reynolds, M. [Department of Oncology, Medical Physics Division, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada); Fallone, B. G. [Department of Medical Physics, Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada); Departments of Oncology and Physics, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada); Rathee, S. [Department of Medical Physics, Cross Cancer Institute, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada); Department of Oncology, Medical Physics Division, University of Alberta, 11560 University Avenue, Edmonton, Alberta T6G 1Z2 (Canada)

    2013-04-15

    Purpose: The magnetic fields of an integrated MR-Linac system will alter the paths of electrons that produce ions in the ionization chambers. The dose response of selected ion chambers is evaluated in the presence of varying transverse and longitudinal magnetic fields. The investigation is useful in calibration of therapeutic x-ray beams associated with MR-Linac systems. Methods: The Monte Carlo code PENELOPE was used to model the irradiation of NE2571, and PR06C ionization chambers in the presence of a transverse and longitudinal (with respect to the photon beam) magnetic fields of varying magnitude. The long axis of each chamber was simulated both parallel and perpendicular to the incident photon beam for each magnetic field case. The dose deposited in each chamber for each case was compared to the case with zero magnetic field by means of a ratio. The PR06C chamber's response was measured in the presence of a transverse magnetic field with field strengths ranging from 0.0 to 0.2 T to compare to simulated results. Results: The simulations and measured data show that in the presence of a transverse magnetic field there is a considerable dose response (maximum of 11% near 1.0 T in the ion chambers investigated, which depends on the magnitude of magnetic field, and relative orientation of the magnetic field, radiation beam, and ion chamber. Measurements made with the PR06C chamber verify these results in the region of measurement. In contrast, a longitudinal magnetic field produces only a slight increase in dose response (2% at 1.5 T) that rises slowly with increasing magnetic field and is seemingly independent of chamber orientation. Response trends were similar for the two ion chambers and relative orientations considered, but slight variations are present from chamber to chamber. Conclusions: Care must be taken when making ion chamber measurements in a transverse magnetic field. Ion chamber responses vary not only with transverse field strength, but with chamber orientation and type, and can be considerable. Longitudinal magnetic fields influence ion chamber responses relatively little (2% at 1.5 T), and only at field strengths in excess of 1.0 T.

  11. The effect of discharge chamber geometry on the ignition of low-pressure rf capacitive discharges

    SciTech Connect (OSTI)

    Lisovskiy, V.; Martins, S.; Landry, K.; Douai, D.; Booth, J.-P.; Cassagne, V.; Yegorenkov, V. [Laboratoire de Physique et Technologie des Plasmas, Ecole Polytechnique, Palaiseau 91128, France and Kharkov National University, Kharkov 61077 (Ukraine); Unaxis Displays Division France SAS, 5, Rue Leon Blum, Palaiseau 91120 (France); Laboratoire de Physique et Technologie des Plasmas, Ecole Polytechnique, Palaiseau 91128 (France); Unaxis Displays Division France SAS, 5, Rue Leon Blum, Palaiseau 91120 (France); Kharkov National University, Kharkov 61077 (Ukraine)

    2005-09-15

    This paper reports measured and calculated breakdown curves in several gases of rf capacitive discharges excited at 13.56 MHz in chambers of three different geometries: parallel plates surrounded by a dielectric cylinder ('symmetric parallel plate'), parallel plates surrounded by a grounded metallic cylinder ('asymmetric parallel plate'), and parallel plates inside a much larger grounded metallic chamber ('large chamber'). The breakdown curves for the symmetric chamber have a multivalued section at low pressure. For the asymmetric chamber the breakdown curves are shifted to lower pressures and rf voltages, but the multivalued feature is still present. At higher pressures the breakdown voltages are much lower than for the symmetric geometry. For the large chamber geometry the multivalued behavior is not observed. The breakdown curves were also calculated using a numerical model based on fluid equations, giving results that are in satisfactory agreement with the measurements.

  12. Prediction of inertial confinement fusion chamber gas evolution using multi-species computational fluid dynamics

    E-Print Network [OSTI]

    Martin, Robert Scott

    2007-01-01

    to the pro- duction of fusion energy for power generation.injection in an inertial fusion energy chamber, Fusionas Laser Inertial Fusion Energy (Laser IFE), the ability to

  13. Liquid fuel vaporizer and combustion chamber having an adjustable thermal conductor

    DOE Patents [OSTI]

    Powell, Michael R; Whyatt, Greg A; Howe, Daniel T; Fountain, Matthew S

    2014-03-04

    The efficiency and effectiveness of apparatuses for vaporizing and combusting liquid fuel can be improved using thermal conductors. For example, an apparatus having a liquid fuel vaporizer and a combustion chamber can be characterized by a thermal conductor that conducts heat from the combustion chamber to the vaporizer. The thermal conductor can be a movable member positioned at an insertion depth within the combustion chamber that corresponds to a rate of heat conduction from the combustion chamber to the vaporizer. The rate of heat conduction can, therefore, be adjusted by positioning the movable member at a different insertion depth.

  14. Conceptual Design Report for the Extreme Ecosystems Test Chambers

    SciTech Connect (OSTI)

    C. Barnes; J. Beller; K. Caldwell; K. Croft; R. Cherry; W. Landman

    1998-12-01

    This conceptual design supports the creation of Extreme Ecosystems Test Chambers, which will replicate deep subsurface and subocean environments characterized by high pressure (2,000 psi) and subfreezing to high temperature (-4 to 300 degrees F) with differing chemical and saturation conditions. The design provides a system to support research and development that includes heat transfer, phase change issues in porous media, microbiology in extreme environments, and carbon sequestration and extraction. The initial system design is based on the research needs to support the commercial production of methane hydrates from subsurface sediments. The design provides for three pressure vessels: a Down Hole Test Vessel, a Vertical Multi-phase Test Vessel, and a Horizontal Multi-phase Test Vessel.

  15. Effects of acidic deposition on paint: A chamber study

    SciTech Connect (OSTI)

    Spence, J.W.; Lemmons, T.J.; Hou, Y.; Schadt, R.J.; Fornes, R.E.

    1993-08-01

    Exterior acrylic latex and alkyd architectural coatings were exposed to different conditions in a chamber exposure system involving simulated sunlight, dew, and photochemical smog-containing sulfur dioxide (SO2). A simulated sunlight exposure of the coating films in the presence of clean air was also incorporated into the experimental design. Changes in surface features after 1,370 hours of exposure were characterized by scanning electron microscope (SEM) and energy dispersive analysis of x-rays (EDAX). Gaseous species that deposited to the films were determined by ion chromatography of the dew collections. Color-change measurements of the exposed films were recorded as Delta E values. Latex and alkyd films that were formulated with calcium carbonate (CACO3) as an extender pigment were found to undergo the most change in surface features, composition, and color.

  16. Charge-Focusing Readout of Time Projection Chambers

    E-Print Network [OSTI]

    S. J. Ross; M. T. Hedges; I. Jaegle; M. D. Rosen; I. S. Seong; T. N. Thorpe; S. E. Vahsen; J. Yamaoka

    2013-04-02

    Time projection chambers (TPCs) have found a wide range of applications in particle physics, nuclear physics, and homeland security. For TPCs with high-resolution readout, the readout electronics often dominate the price of the final detector. We have developed a novel method which could be used to build large-scale detectors while limiting the necessary readout area. By focusing the drift charge with static electric fields, we would allow a small area of electronics to be sensitive to particle detection for a much larger detector volume. The resulting cost reduction could be important in areas of research which demand large-scale detectors, including dark matter searches and detection of special nuclear material. We present simulations made using the software package Garfield of a focusing structure to be used with a prototype TPC with pixel readout. This design should enable significant focusing while retaining directional sensitivity to incoming particles. We also present first experimental results and compare them with simulation.

  17. *Always wear lint and powder free clean room gloves when reaching into the specimen chamber to reduce leaving oils, dust, or other contaminants inside the chamber.

    E-Print Network [OSTI]

    SX-100 *Always wear lint and powder free clean room gloves when reaching into the specimen chamber (off) on the small on/off box behind the monitors. 6) Wait 30 minutes to cool down the diffusion pump

  18. Method and apparatus for active control of combustion rate through modulation of heat transfer from the combustion chamber wall

    DOE Patents [OSTI]

    Roberts, Jr., Charles E.; Chadwell, Christopher J.

    2004-09-21

    The flame propagation rate resulting from a combustion event in the combustion chamber of an internal combustion engine is controlled by modulation of the heat transfer from the combustion flame to the combustion chamber walls. In one embodiment, heat transfer from the combustion flame to the combustion chamber walls is mechanically modulated by a movable member that is inserted into, or withdrawn from, the combustion chamber thereby changing the shape of the combustion chamber and the combustion chamber wall surface area. In another embodiment, heat transfer from the combustion flame to the combustion chamber walls is modulated by cooling the surface of a portion of the combustion chamber wall that is in close proximity to the area of the combustion chamber where flame speed control is desired.

  19. Source of methane and methods to control its formation in single chamber microbial electrolysis cells

    E-Print Network [OSTI]

    Source of methane and methods to control its formation in single chamber microbial electrolysis online 31 March 2009 Keywords: Hydrogen Microbial electrolysis cell (MEC) Methane Single chamber Exoelectrogenic a b s t r a c t Methane production occurs during hydrogen gas generation in microbial electrolysis

  20. Subsidence in magma chamber and the development of magmatic foliation in Oman ophiolite gabbros

    E-Print Network [OSTI]

    Cattin, Rodolphe

    Subsidence in magma chamber and the development of magmatic foliation in Oman ophiolite gabbros Keywords: Oman ophiolite fast spreading ridges magma chamber gabbro subsidence In the Oman ophiolite these gabbros to subsidence of a compacting mush from the floor of the melt lens into the underlying, main magma

  1. On the dynamic nature of azimuthal thermoacoustic modes in annular gas turbine combustion chambers

    E-Print Network [OSTI]

    Daraio, Chiara

    On the dynamic nature of azimuthal thermoacoustic modes in annular gas turbine combustion chambers with the dynamics of standing and rotating azimuthal thermoacoustic modes in annular combustion chambers source intensity, the asymmetry in the system and the strength of the thermo-acoustic interaction

  2. Dynamic Chamber System to Measure Gaseous Compounds Emissions and Atmospheric-Biospheric Interactions

    E-Print Network [OSTI]

    Aneja, Viney P.

    : Dynamic chamber, Emissions, Ammonia, Nitrogen oxide, Hydrogen sulphide, Hydrogen peroxide Abstract agricultural soils where nitrogen-rich fertilizers have been applied. Ammonia-nitrogen (NH3-N) and reduced-liquid interface at swine waste treatment anaerobic storage lagoons, and agricultural fields. Similar chamber

  3. A simple analytical model to study and control azimuthal instabilities in annular combustion chambers

    E-Print Network [OSTI]

    Nicoud, Franck

    . It is based on a one-dimensional zero Mach number formulation where N burners are connected to a single) a single burner connected to an annular chamber (N = 1), (2) two burners connected to the chamber (N = 2), (3) four burners (N = 4). In this case, the tool also allows to study passive control methods where

  4. In situ reduction and evaluation of anode supported single chamber solid oxide fuel cells

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    In situ reduction and evaluation of anode supported single chamber solid oxide fuel cells D.05.118 #12;Abstract Single chamber anode-supported fuel cells are investigated under several methane under methane-to-oxygen ratio (Rmix) of 2. Anode-supported fuel cells are investigated regarding

  5. Sensitivity of LR 115 detectors in hemispherical chambers for radon measurements

    E-Print Network [OSTI]

    Yu, Peter K.N.

    Sensitivity of LR 115 detectors in hemispherical chambers for radon measurements D. Nikezic 1 , F, if the radius is larger than 3 cm, the effects of the deposition fraction of radon progeny will come into effect, which will again introduce uncertainties in radon measurements. For the hemispherical chamber

  6. Micro Strip Gas Chambers Overcoated with Carbon, Hydrogenated Amorphous Silicon, and Glass Films

    E-Print Network [OSTI]

    Micro Strip Gas Chambers Overcoated with Carbon, Hydrogenated Amorphous Silicon, and Glass Films M Moscow GSP­1, Russia c Moscow Power Engineering Institute, Krasnokazarmennaya St. 14, Moscow, Russia Abstract The performance of glass and sapphire substrate Micro Strip Gas Chambers with chromium

  7. October 27-28, 2004 HAPL meeting, PPPL Overview of the Components of an IFE Chamber

    E-Print Network [OSTI]

    Raffray, A. René

    Energy Source: IFE Based on Lasers, Direct Drive Targets and Solid Wall Chambers Target injection (including radiation) - Turbulence effects - Laser lines and effect on final optics - Impact target injection for Chamber with R=6.5 m (from BUCKY) #12;October 27-28, 2004 HAPL meeting, PPPL 4 · Target injection

  8. The development and application of advanced analytical methods to commercial ICF reactor chambers. Final report

    SciTech Connect (OSTI)

    Cousseau, P.; Engelstad, R.; Henderson, D.L. [and others

    1997-10-01

    Progress is summarized in this report for each of the following tasks: (1) multi-dimensional radiation hydrodynamics computer code development; (2) 2D radiation-hydrodynamic code development; (3) ALARA: analytic and Laplacian adaptive radioactivity analysis -- a complete package for analysis of induced activation; (4) structural dynamics modeling of ICF reactor chambers; and (5) analysis of self-consistent target chamber clearing.

  9. IFE CHAMBER TECHNOLOGY STATUS AND FUTURE CHALLENGES W.R. Meier1

    E-Print Network [OSTI]

    Raffray, A. René

    1 IFE CHAMBER TECHNOLOGY ­ STATUS AND FUTURE CHALLENGES W.R. Meier1 , A.R. Raffrary2 , S.I. Abdel.gov (925) 422-8536 2. University of California, San Diego, CA 3. Georgia Institute of Technology, Atlanta-ion, laser and Z-pinch drivers. A variety of chamber concepts are being investigated including dry- wall

  10. IFE CHAMBER TECHNOLOGY STATUS AND FUTURE CHALLENGES W.R. Meier1

    E-Print Network [OSTI]

    Najmabadi, Farrokh

    IFE CHAMBER TECHNOLOGY ­ STATUS AND FUTURE CHALLENGES W.R. Meier1 , A.R. Raffray2 , S.I. Abdel.gov (925) 422-8536 2. University of California, San Diego, CA 3. Georgia Institute of Technology, Atlanta-ion, laser and Z-pinch drivers. A variety of chamber concepts are being investigated including dry- wall

  11. Integrated Chamber Design for the Laser Inertial Fusion Energy (LIFE) Engine

    SciTech Connect (OSTI)

    Latkowski, J F; Kramer, K J; Abbott, R P; Morris, K R; DeMuth, J; Divol, L; El-Dasher, B; Lafuente, A; Loosmore, G; Reyes, S; Moses, G A; Fratoni, M; Flowers, D; Aceves, S; Rhodes, M; Kane, J; Scott, H; Kramer, R; Pantano, C; Scullard, C; Sawicki, R; Wilks, S; Mehl, M

    2010-12-07

    The Laser Inertial Fusion Energy (LIFE) concept is being designed to operate as either a pure fusion or hybrid fusion-fission system. A key component of a LIFE engine is the fusion chamber subsystem. The present work details the chamber design for the pure fusion option. The fusion chamber consists of the first wall and blanket. This integrated system must absorb the fusion energy, produce fusion fuel to replace that burned in previous targets, and enable both target and laser beam transport to the ignition point. The chamber system also must mitigate target emissions, including ions, x-rays and neutrons and reset itself to enable operation at 10-15 Hz. Finally, the chamber must offer a high level of availability, which implies both a reasonable lifetime and the ability to rapidly replace damaged components. An integrated LIFE design that meets all of these requirements is described herein.

  12. Fluid intensifier having a double acting power chamber with interconnected signal rods

    DOE Patents [OSTI]

    Whitehead, John C. (Davis, CA)

    2001-01-01

    A fluid driven reciprocating apparatus having a double acting power chamber with signal rods serving as high pressure pistons, or to transmit mechanical power. The signal rods are connected to a double acting piston in the power chamber thereby eliminating the need for pilot valves, with the piston being controlled by a pair of intake-exhaust valves. The signal rod includes two spaced seals along its length with a vented space therebetween so that the driving fluid and driven fluid can't mix, and performs a switching function to eliminate separate pilot valves. The intake-exhaust valves can be integrated into a single housing with the power chamber, or these valves can be built into the cylinder head only of the power chamber, or they can be separate from the power chamber.

  13. Photoelectron Yield and Photon Reflectivity from Candidate LHC Vacuum Chamber Materials with Implications to the Vacuum Chamber Design

    E-Print Network [OSTI]

    Baglin, V; Gröbner, Oswald

    1998-01-01

    Studies of the photoelectron yield and photon reflectivity at grazing incidence (11 mrad) from candidate LHC vacuum chamber materials have been made on a dedicated beam line on the Electron Positron A ccumulator (EPA) ring at CERN. These measurements provide realistic input toward a better understanding of the electron cloud phenomena expected in the LHC. The measurements were made using synchrotro n radiation with critical photon energies of 194 eV and 45 eV; the latter corresponding to that of the LHC at the design energy of 7 TeV. The test materials are mainly copper, either, i) coated by co- lamination or by electroplating onto stainless steel, or ii) bulk copper prepared by special machining. The key parameters explored were the effect of surface roughness on the reflectivity and the pho toelectron yield at grazing photon incidence, and the effect of magnetic field direction on the yields measured at normal photon incidence. The implications of the results on the electron cloud phenom ena, and thus the L...

  14. The effect of heat treatments and coatings on the outgassing rate of stainless steel chambers

    E-Print Network [OSTI]

    Mamun, M A; Stutzman, M L; Adderley, P A; Poelker, M

    2014-01-01

    The outgassing rates of four nominally identical 304L stainless steel vacuum chambers were measured to determine the effect of chamber coatings and heat treatments. One chamber was coated with titanium nitride (TiN) and one with amorphous silicon (a-Si) immediately following fabrication. One chamber remained uncoated throughout, and the last chamber was first tested without any coating, and then coated with a-Si following a series of heat treatments. The outgassing rate of each chamber was measured at room temperatures between 15 and 30 {\\deg}C following bakes at temperatures between 90 and 400 {\\deg}C. Measurements for bare steel showed a significant reduction in the outgassing rate by more than a factor of 20 after a 400 {\\deg}C heat treatment (4x10-12 TorrLs-1cm-2 prior to heat treatment, reduced to 1.7x10-13 following heat treatment). The chambers that were coated with a-Si showed minimal change in outgassing rates with heat treatment, though an outgassing rate reduced by heat treatments prior to a-Si coa...

  15. Voltage Oscillations in Single-Chamber Fuel Cells operating under a C3H8 / O2 mixture.

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    1 Voltage Oscillations in Single-Chamber Fuel Cells operating under a C3H8 / O2 mixture. Geoffroy : Jean-Paul Viricelle, viricelle@emse.fr Phone : 33 4 77 42 02 52 Abstract : Single-Chamber Fuel Cells this behaviour. Keywords: Single Chamber Fuel Cell, Propane, Oscillation, Anode. 1. Introduction Solid Oxide Fuel

  16. Design and construction of a compact multi-chamber tissue equivalent proportional counter 

    E-Print Network [OSTI]

    Taplin, Temeka

    2006-04-12

    This project was designed to determine the feasibility of constructing a multichamber proportional counter. A multi-chamber detector is designed to increase the total surface area which will increase the number of radiation interactions that occur...

  17. Potential applications of the natural design of internal explosion chambers in the bombardier beetle (Carabidae, Brachinus)

    E-Print Network [OSTI]

    Lai, Changquan

    2010-01-01

    The Bombardier Beetle (Carabidae, Brachinus) has a unique form of defense mechanism which involves the explosive mixing of hydroquinones and hydrogen peroxide in its internal explosion chambers and using the resultant high ...

  18. Monte Carlo calculations of electron beam quality conversion factors for several ion chamber types

    SciTech Connect (OSTI)

    Muir, B. R.; Rogers, D. W. O.

    2014-11-01

    Purpose: To provide a comprehensive investigation of electron beam reference dosimetry using Monte Carlo simulations of the response of 10 plane-parallel and 18 cylindrical ion chamber types. Specific emphasis is placed on the determination of the optimal shift of the chambers’ effective point of measurement (EPOM) and beam quality conversion factors. Methods: The EGSnrc system is used for calculations of the absorbed dose to gas in ion chamber models and the absorbed dose to water as a function of depth in a water phantom on which cobalt-60 and several electron beam source models are incident. The optimal EPOM shifts of the ion chambers are determined by comparing calculations of R{sub 50} converted from I{sub 50} (calculated using ion chamber simulations in phantom) to R{sub 50} calculated using simulations of the absorbed dose to water vs depth in water. Beam quality conversion factors are determined as the calculated ratio of the absorbed dose to water to the absorbed dose to air in the ion chamber at the reference depth in a cobalt-60 beam to that in electron beams. Results: For most plane-parallel chambers, the optimal EPOM shift is inside of the active cavity but different from the shift determined with water-equivalent scaling of the front window of the chamber. These optimal shifts for plane-parallel chambers also reduce the scatter of beam quality conversion factors, k{sub Q}, as a function of R{sub 50}. The optimal shift of cylindrical chambers is found to be less than the 0.5 r{sub cav} recommended by current dosimetry protocols. In most cases, the values of the optimal shift are close to 0.3 r{sub cav}. Values of k{sub ecal} are calculated and compared to those from the TG-51 protocol and differences are explained using accurate individual correction factors for a subset of ion chambers investigated. High-precision fits to beam quality conversion factors normalized to unity in a beam with R{sub 50} = 7.5 cm (k{sub Q}{sup ?}) are provided. These factors avoid the use of gradient correction factors as used in the TG-51 protocol although a chamber dependent optimal shift in the EPOM is required when using plane-parallel chambers while no shift is needed with cylindrical chambers. The sensitivity of these results to parameters used to model the ion chambers is discussed and the uncertainty related to the practical use of these results is evaluated. Conclusions: These results will prove useful as electron beam reference dosimetry protocols are being updated. The analysis of this work indicates that cylindrical ion chambers may be appropriate for use in low-energy electron beams but measurements are required to characterize their use in these beams.

  19. Fabrication and Characterisation of Oil-Free Large Bakelite Resistive Plate Chamber

    E-Print Network [OSTI]

    Rajesh Ganai; Arindam Roy; Kshitij Agarwal; Zubayer Ahammed; Subikash Choudhury; Subhasis Chattopadhyay

    2015-10-08

    A large (240 cm $\\times$ 120 cm $\\times$ 0.2 cm) oil-free bakelite Resistive Plate Chamber (RPC) has been developed at VECC-Kolkata using locally available P-301 OLTC grade bakelite paper laminates. The chamber has been operated in streamer mode using Argon, Freon(R134a) and Iso-butane in a ratio of 34:57:9 by volume. The electrodes and glue samples have been characterised by measuring their electrical parameters like bulk resistivity and surface resistivity. The performance of the chamber has been studied by measuring the efficiency, time resolution and uniformity in detection of cosmic muons. The chamber showed an efficiency $>$95$\\%$ and time resolution ($\\sigma$) of $\\sim$0.83 ns at 9000V. Details of the material characterisation, fabrication procedure and performance studies have been discussed.

  20. The design, fabrication, and implications of a solvothermal vapor annealing chamber

    E-Print Network [OSTI]

    Porter, Nathaniel R., Jr

    2013-01-01

    This thesis documents the design, fabrication, use, and benefits of a prototype aluminum solvothermal vapor annealing chamber which facilitates the self-assembly of block copolymers (BCPs) on silicon wafers which are then ...

  1. Impact of beam transport method on chamber and driver design for heavy ion inertial fusion energy

    E-Print Network [OSTI]

    Rose, D.V.; Welch, D.R.; Olson, C.L.; Yu, S.S.; Neff, S.; Sharp, W.M.

    2002-01-01

    A. Moses, “Inertial fusion energy target output and chamberA. J. Schmitt, et al. , “Fusion energy research with lasers,o?s for inertial fusion energy power plants,” presented at

  2. Aug. 8-9, 2006 HAPL meeting, GA Advanced Chamber Concept with Magnetic Intervention

    E-Print Network [OSTI]

    Raffray, A. René

    ). · The initial configuration was rotated 90° for the blanket analysis as this seems to favor the maintenance droplets falling in chamber Pb flow Porous mesh Pb film Pump Liquid recycling #12;Aug. 8-9, 2006 HAPL

  3. Impact of beam transport method on chamber and driver design for heavy ion inertial fusion energy

    SciTech Connect (OSTI)

    Rose, D.V.; Welch, D.R.; Olson, C.L.; Yu, S.S.; Neff, S.; Sharp, W.M.

    2002-12-01

    In heavy ion inertial fusion energy systems, intense beams of ions must be transported from the exit of the final focus magnet system through the target chamber to hit millimeter spot sizes on the target. In this paper, we examine three different modes of beam propagation: neutralized ballistic transport, assisted pinched transport, and self-pinched transport. The status of our understanding of these three modes is summarized, and the constraints imposed by beam propagation upon the chamber environment, as well as their compatibility with various chamber and target concepts, are considered. We conclude that, on the basis of our present understanding, there is a reasonable range of parameter space where beams can propagate in thick-liquid wall, wetted-wall, and dry-wall chambers.

  4. Fabrication and Characterisation of Oil-Free Large Bakelite Resistive Plate Chamber

    E-Print Network [OSTI]

    Ganai, Rajesh; Agarwal, Kshitij; Ahammed, Zubayer; Choudhury, Subikash; Chattopadhyay, Subhasis

    2015-01-01

    A large (240 cm $\\times$ 120 cm $\\times$ 0.2 cm) oil-free bakelite Resistive Plate Chamber (RPC) has been developed at VECC-Kolkata using locally available P-301 OLTC grade bakelite paper laminates. The chamber has been operated in streamer mode using Argon, Freon(R134a) and Iso-butane in a ratio of 34:57:9 by volume. The electrodes and glue samples were characterised by measuring their electrical parameters like bulk resistivity and surface resistivity. The performance of the chamber was studied by measuring the efficiency, time resolution and uniformity in detection of cosmic muons. The chamber showed an efficiency $>$95$\\%$ and time resolution ($\\sigma$) of $\\sim$0.83 ns. Details of the material characterisation, fabrication procedure and performance studies have been discussed.

  5. Study of surface kinetics in PECVD chamber cleaning using remote plasma source

    E-Print Network [OSTI]

    An, Ju Jin

    2008-01-01

    The scope of this research work is to characterize the Transformer Coupled Toroidal Plasma (TCTP); to understand gas phase reactions and surface reactions of neutrals in the cleaning chamber by analyzing the concentration ...

  6. A sun-tracking environmental chamber for the outdoor quantification of CPV modules

    SciTech Connect (OSTI)

    Faiman, David Melnichak, Vladimir Bokobza, Dov Kabalo, Shlomo

    2014-09-26

    The paper describes a sun-tracking environmental chamber and its associated fast electronics, devised for the accurate outdoor characterization of CPV cells, receivers, mono-modules, and modules. Some typical measurement results are presented.

  7. Impact of beam transport method on chamber and driver design for heavy ion inertial fusion energy

    E-Print Network [OSTI]

    Rose, D.V.; Welch, D.R.; Olson, C.L.; Yu, S.S.; Neff, S.; Sharp, W.M.

    2002-01-01

    A. Moses, “Inertial fusion energy target output and chamberA. J. Schmitt, et al. , “Fusion energy research with lasers,and focusing,” J. Fusion Energy 1, 309 (1982). [35] D. R.

  8. Connecting Software Architecture to Implementation Jonathan Aldrich Craig Chambers David Notkin

    E-Print Network [OSTI]

    van der Hoek, André

    ArchJava: Connecting Software Architecture to Implementation Jonathan Aldrich Craig Chambers David architecture describes the structure of a system, enabling more effective design, program understanding, and formal analysis. However, existing approaches decouple implementation code from architecture, allowing

  9. Method of correcting eddy current magnetic fields in particle accelerator vacuum chambers

    DOE Patents [OSTI]

    Danby, G.T.; Jackson, J.W.

    1990-03-19

    A method for correcting magnetic field aberrations produced by eddy currents induced in a particle accelerator vacuum chamber housing is provided wherein correction windings are attached to selected positions on the housing and the windings are energized by transformer action from secondary coils, which coils are inductively coupled to the poles of electro-magnets that are powered to confine the charged particle beam within a desired orbit as the charged particles are accelerated through the vacuum chamber by a particle-driving rf field. The power inductively coupled to the secondary coils varies as a function of variations in the power supplied by the particle-accelerating rf field to a beam of particles accelerated through the vacuum chamber, so the current in the energized correction coils is effective to cancel eddy current flux fields that would otherwise be induced in the vacuum chamber by power variations (dB/dt) in the particle beam.

  10. Method of correcting eddy current magnetic fields in particle accelerator vacuum chambers

    DOE Patents [OSTI]

    Danby, Gordon T. (Wading River, NY); Jackson, John W. (Shoreham, NY)

    1991-01-01

    A method for correcting magnetic field aberrations produced by eddy currents induced in a particle accelerator vacuum chamber housing is provided wherein correction windings are attached to selected positions on the housing and the windings are energized by transformer action from secondary coils, which coils are inductively coupled to the poles of electro-magnets that are powered to confine the charged particle beam within a desired orbit as the charged particles are accelerated through the vacuum chamber by a particle-driving rf field. The power inductively coupled to the secondary coils varies as a function of variations in the power supplied by the particle-accelerating rf field to a beam of particles accelerated through the vacuum chamber, so the current in the energized correction coils is effective to cancel eddy current flux fields that would otherwise be induced in the vacuum chamber by power variations in the particle beam.

  11. Invention and History of the Bubble Chamber (LBNL Summer Lecture Series)

    ScienceCinema (OSTI)

    Glaser, Don

    2011-04-28

    Summer Lecture Series 2006: Don Glaser won the 1960 Nobel Prize for Physics for his 1952 invention of the bubble chamber at Berkeley Lab, a type of particle detector that became the mainstay of high-energy physics research throughout the 1960s and 1970s. He discusses how, inspired by bubbles in a glass of beer, he invented the bubble chamber and detected cosmic-ray muons.

  12. The Effect of Heat Treatments and Coatings on the Outgassing Rate of Stainless Steel Chambers

    SciTech Connect (OSTI)

    Mamum, Md Abdullah A. [Old Dominion Univ., Norfolk, VA (United States); Elmustafa, Abdelmageed A, [Old Dominion Univ., Norfolk, VA (United States); Stutzman, Marcy L. [JLAB, Newport News, VA (United States); Adderley, Philip A. [JLAB, Newport News, VA (United States); Poelker, Matthew [JLAB, Newport News, VA (United States)

    2014-03-01

    The outgassing rates of four nominally identical 304L stainless steel vacuum chambers were measured to determine the effect of chamber coatings and heat treatments. One chamber was coated with titanium nitride (TiN) and one with amorphous silicon (a-Si) immediately following fabrication. One chamber remained uncoated throughout, and the last chamber was first tested without any coating, and then coated with a-Si following a series of heat treatments. The outgassing rate of each chamber was measured at room temperatures between 15 and 30 deg C following bakes at temperatures between 90 and 400 deg C. Measurements for bare steel showed a significant reduction in the outgassing rate by more than a factor of 20 after a 400 deg C heat treatment (3.5 x 10{sup 12} TorrL s{sup -1}cm{sup -2} prior to heat treatment, reduced to 1.7 x 10{ sup -13} TorrL s{sup -1}cm{sup -2} following heat treatment). The chambers that were coated with a-Si showed minimal change in outgassing rates with heat treatment, though an outgassing rate reduced by heat treatments prior to a-Si coating was successfully preserved throughout a series of bakes. The TiN coated chamber exhibited remarkably low outgassing rates, up to four orders of magnitude lower than the uncoated stainless steel. An evaluation of coating composition suggests the presence of elemental titanium which could provide pumping and lead to an artificially low outgassing rate. The outgassing results are discussed in terms of diffusion-limited versus recombination-limited processes.

  13. The effect of heat treatments and coatings on the outgassing rate of stainless steel chambers

    E-Print Network [OSTI]

    M. A. Mamun; A. A. Elmustafa; M. L. Stutzman; P. A. Adderley; M. Poelker

    2014-01-27

    The outgassing rates of three nominally identical 304L stainless steel vacuum chambers were measured to determine the effect of chamber coatings and heat treatments. One chamber was coated with titanium nitride (TiN) and one with amorphous silicon (a-Si) immediately following fabrication. The last chamber was first tested without any coating, and then coated with a-Si following a series of heat treatments. The outgassing rate of each chamber was measured at room temperatures between 15 and 30 {\\deg}C following bakes at temperatures between 90 and 400 {\\deg}C. Measurements for bare steel showed a significant reduction in the outgassing rate by nearly a factor of 20 after a 400 {\\deg}C heat treatment (3.5x10-12 Torr L s-1 cm-2 prior to heat treatment, reduced to 1.7x10-13 Torr L s-1 cm-2 following heat treatment). The chambers that were coated with a-Si showed minimal change in outgassing rates with heat treatment, though an outgassing rate reduced by heat treatments prior to a-Si coating was successfully preserved throughout a series of bakes. The TiN coated chamber exhibited remarkably low outgassing rates, up to four orders of magnitude lower than the uncoated stainless steel, but the uncertainty in these rates is large due to the sensitivity limitations of the spinning rotor gauge accumulation measurement and the possibility of a small pump speed due to inhomogeneity in the TiN coating. The outgassing results are discussed in terms of diffusion-limited versus recombination-limited processes.

  14. Lossy chaotic electromagnetic reverberation chambers: Universal statistical behavior of the vectorial field

    E-Print Network [OSTI]

    J. -B. Gros; U. Kuhl; O. Legrand; F. Mortessagne

    2015-09-22

    The effective Hamiltonian formalism is extended to vectorial electromagnetic waves in order to describe statistical properties of the field in reverberation chambers. The latter are commonly used in electromagnetic compatibility tests. As a first step, the distribution of wave intensities in chaotic systems with varying opening in the weak coupling limit for scalar quantum waves is derived by means of random matrix theory. In this limit the only parameters are the modal overlap and the number of open channels. Using the extended effective Hamiltonian, we describe the intensity statistics of the vectorial electromagnetic eigenmodes of lossy reverberation chambers. Finally, the typical quantity of interest in such chambers, namely, the distribution of the electromagnetic response, is discussed. By determining the distribution of the phase rigidity - describing the coupling to the environment - using random matrix numerical data, we find good agreement between the theoretical prediction and numerical calculations of the response.

  15. High-resolution ion pulse ionization chamber with air filling for the Rn-222 decays detection

    E-Print Network [OSTI]

    Gavrilyuk, Yu M; Gezhaev, A M; Etezov, R A; Kazalov, V V; Kuzminov, V V; Panasenko, S I; Ratkevich, S S; Tekueva, D A; Yakimenko, S P

    2015-01-01

    The construction and characteristics of the cylindrical ion pulse ionization chamber (CIPIC) with a working volume of 3.2 L are described. The chamber is intended to register alpha-particles from the $^{222}$Rn and its daughter's decays in the filled air sample. The detector is less sensitive to electromagnetic pick-ups and mechanical noises. The digital pulse processing method is proposed to improve the energy resolution of the ion pulse ionization chamber. An energy resolution of 1.6% has been achieved for the 5.49 MeV alpha-line. The dependence of the energy resolution on high voltage and working media pressure has been investigated and the results are presented.

  16. Effects of outgassing of loader chamber walls on hydriding of thin films for commercial applications

    SciTech Connect (OSTI)

    Provo, James L., E-mail: jlprovo@verizon.net [Consultant, J.L. Provo Consulting, Trinity, Florida 34655-7179 (United States)

    2014-07-01

    An important aspect of understanding industrial processing is to know the characteristics of the materials used in such processes. A study was performed to determine the effects of hydriding chamber material on the degree of hydriding for the commercial production of thin film hydride targets for various research universities, commercial companies, and government national laboratories. The goal was to increase the degree of hydriding of various thin film hydrides and to study the vacuum environment during air-exposure hydriding. For this purpose, dynamic residual gas analysis during deuterium gas hydride processing was utilized with erbium thin films, employing a special set-up for direct dynamic hydride gas sampling during processing at elevated temperature and full loading gas pressure. Complete process data for (1) a copper–(1.83?wt.?%)beryllium wet hydrogen fired passivated (600?°C–1?h) externally heated pipe hydriding chamber are reported. Dynamic residual gas analysis comparisons during hydriding are presented for hydriding chambers made from (2) alumina (99.8 wt.?%), (3) copper (with an interior aluminum coating ?10 k Å thick, and (4) for a stainless-steel air-fired passivated (900?°C–1?h) chamber. Dynamic data with deuterium gas in the chamber at the hydriding temperature (450?°C) showed the presence and growth of water vapor (D{sub 2}O) and related mixed ion species(H{sub 2}O{sup +}, HDO{sup +}, D{sub 2}O{sup +}, and OD{sup +}) from hydrogen isotope exchange reactions during the 1?h process time. Peaks at mass-to-charge ratios (i.e., m/e) of 12(C{sup +}), 16(CD{sub 2}{sup +}), 17(CHD{sub 2}{sup +}), and 18(CD{sub 3}{sup +}, OD{sup +}) increased for approximately the first half hour of a 1?h hydriding process and then approach steady state. Mass-to-charge peaks at 19(HDO{sup +}) and 20(D{sub 2}O{sup +}) continue to increase throughout the process cycle. Using the m/e?=?20 (D{sub 2}O{sup +}) peak intensity from chamber (1)–Cu(1.83 wt.?%)Be as a standard, the peak intensity from chamber (4)—stainless-steel (air-fired) was 7.1× higher, indicating that the surface of stainless-steel had a larger concentration of reactive oxygen and/or water than hydrogen. The (D{sub 2}O{sup +}) peak intensity from chamber (3)—Cu (interior Al coating) was 1.55× larger and chamber (2)—alumina(99.8%) was 1.33× higher than Cu(1.83 wt.?%)Be. Thus copper–(1.83 wt.?%)beryllium was the best hydriding chamber material studied followed closely by the alumina (99.8 wt.?%) chamber. Gas take-up by Er occluder targets processed in Cu(1.83?wt.?%)Be hydriding chambers (i.e., gas/metal atomic ratios) correlate with the dynamic RGA data.

  17. Multi-gap Resistive Plate Chambers as a Time-of-Flight System for the PHENIX Experiment

    SciTech Connect (OSTI)

    Velkovska, Julia

    2013-12-08

    In this project a Time-of-Flight detector based on multi-gap resistive plate chambers was built and installed for the PHENIX experiment at RHIC.

  18. Wafer chamber having a gas curtain for extreme-UV lithography

    DOE Patents [OSTI]

    Kanouff, Michael P. (Livermore, CA); Ray-Chaudhuri, Avijit K. (Livermore, CA)

    2001-01-01

    An EUVL device includes a wafer chamber that is separated from the upstream optics by a barrier having an aperture that is permeable to the inert gas. Maintaining an inert gas curtain in the proximity of a wafer positioned in a chamber of an extreme ultraviolet lithography device can effectively prevent contaminants from reaching the optics in an extreme ultraviolet photolithography device even though solid window filters are not employed between the source of reflected radiation, e.g., the camera, and the wafer. The inert gas removes the contaminants by entrainment.

  19. Design and performance of an ionisation chamber for the measurement of low alpha-activities

    E-Print Network [OSTI]

    Andreas Hartmann; Jochen Hutsch; Felix Krüger; Manfred Sobiella; Heinrich Wilsenach; Kai Zuber

    2015-11-04

    A new ionisation chamber for alpha-spectroscopy has been built from radio-pure materials for the purpose of investigating long lived alpha-decays. The measurement makes use of pulse shape analysis to discriminate between signal and background events. The design and performance of the chamber is described in this paper. A background rate of ($10.9 \\pm 0.6$) counts per day in the energy region of 1 MeV to 9 MeV was achieved with a run period of 30.8 days. The background is dominantly produced by radon daughters.

  20. Numerical Simulation of Earth Pressure on Head Chamber of Shield Machine with FEM

    SciTech Connect (OSTI)

    Li Shouju; Kang Chengang [State Key Laboratory of structural analysis for industrial equipment, Dalian University of Technology, Dalian 116023 (China); Sun, Wei [School of Mechanical Engineering, Dalian University of Technology, Dalian 116023 (China); Shangguan Zichang [School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116023 (China); Institute of Civil Engineering, Dalian Fishery University, Dalian 116023 (China)

    2010-05-21

    Model parameters of conditioned soils in head chamber of shield machine are determined based on tree-axial compression tests in laboratory. The loads acting on tunneling face are estimated according to static earth pressure principle. Based on Duncan-Chang nonlinear elastic constitutive model, the earth pressures on head chamber of shield machine are simulated in different aperture ratio cases for rotating cutterhead of shield machine. Relationship between pressure transportation factor and aperture ratio of shield machine is proposed by using aggression analysis.

  1. Behavior of Calibration Electrons in the Mu2e Tracking Chamber Devyn Shafera,b

    E-Print Network [OSTI]

    Gollin, George

    Behavior of Calibration Electrons in the Mu2e Tracking Chamber Devyn Shafera,b , George Gollina, University of Pennsylvania July 30, 2010 ABSTRACT The paper describes the simulation of calibration electrons and a description of methods of determining electron paths. The final objective of the project involves creating

  2. Modelling of e-cloud build-up in grooved vacuum chambers usingPOSINST

    SciTech Connect (OSTI)

    Venturini, Marco; Celata, C.; Furman, Miguel; Vay, Jean-Luc; Pivi, Mauro

    2007-06-29

    Use of grooved vacuum chambers have been suggested as a wayto limitelectron cloud accumulation in the ILC-DR. We report onsimulations carried out using an augmented version of POSINST, accountingfor e-cloud dynamics in the presence of grooves, and make contact withprevious estimates of an effective secondary electron yield for groovedsurfaces.

  3. Nested reactor chamber and operation for Hg-196 isotope separation process

    DOE Patents [OSTI]

    Grossman, M.W.

    1991-10-08

    The present invention is directed to an apparatus for use in [sup 196]Hg separation and its method of operation. Specifically, the present invention is directed to a nested reactor chamber useful for [sup 196]Hg isotope separation reactions avoiding the photon starved condition commonly encountered in coaxial reactor systems. 6 figures.

  4. Multi-property characterization chamber for geophysical-hydrological investigations of hydrate bearing sediments

    SciTech Connect (OSTI)

    Seol, Yongkoo Choi, Jeong-Hoon; Dai, Sheng

    2014-08-01

    With the increase in the interest of producing natural gas from methane hydrates as well as potential risks of massive hydrate dissociation in the context of global warming, studies have recently shifted from pure hydrate crystals to hydrates in sediments. Such a research focus shift requires a series of innovative laboratory devices that are capable of investigating various properties of hydrate-bearing sediments (HBS). This study introduces a newly developed high pressure testing chamber, i.e., multi-property characterization chamber (MPCC), that allows simultaneous investigation of a series of fundamental properties of HBS, including small-strain stiffness (i.e., P- and S-waves), shear strength, large-strain deformation, stress-volume responses, and permeability. The peripheral coolant circulation system of the MPCC permits stable and accurate temperature control, while the core holder body, made of aluminum, enables X-ray computer tomography scanning to be easily employed for structural and morphological characterization of specimens. Samples of hydrate-bearing sediments are held within a rubber sleeve inside the chamber. The thick sleeve is more durable and versatile than thin membranes while also being much softer than oedometer-type chambers that are incapable of enabling flow tests. Bias introduced by the rubber sleeve during large deformation tests are also calibrated both theoretically and experimentally. This system provides insight into full characterization of hydrate-bearing sediments in the laboratory, as well as pressure core technology in the field.

  5. OPERATIONAL WINDOWS FOR DRY-WALL AND WETTED-WALL IFE CHAMBERS

    E-Print Network [OSTI]

    ) the detailed character- ization of the target yield and spectrum has a major impact on the chamber; (b National Engineering and Environmental Laboratory, Fusion Safety Program, EROB E-3 MS 3815, Idaho Falls Laboratories, Albuquerque, New Mexico 87185 §§Mission Research Corporation, Albuquerque, New Mexico 87110 77

  6. Numerical simulation of detonation processes in a variable cross-section chamber

    E-Print Network [OSTI]

    Texas at Arlington, University of

    in a combustion chamber with variable cross- sections are numerically simulated for a hydrogen­air reacting flow facilities [2]. The pri- mary advantage of detonation combustion as com- pared to deflagration is its rapid energy release. This rapid energy release allows the design of pulse detona- tion engines with high

  7. Numerical Study of Unsteady Detonation Wave Propagation in a Supersonic Combustion Chamber

    E-Print Network [OSTI]

    Texas at Arlington, University of

    Numerical Study of Unsteady Detonation Wave Propagation in a Supersonic Combustion Chamber T.H. Yi, of which each mode has unique features and operation ranges: an ejector aug- mented pulsed detonation rocket (PDR) mode, a pulsed normal detonation wave engine (NDWE) mode, an oblique detonation wave engine

  8. Measurements of Snow Crystal Growth Dynamics in a Free-fall Convection Chamber

    E-Print Network [OSTI]

    Libbrecht, Kenneth G.

    Measurements of Snow Crystal Growth Dynamics in a Free-fall Convection Chamber Kenneth G. Libbrecht example of this phenomenon is the formation of snow crystals, which are ice crystals that grow from water vapor in an inert background gas. Although this is a relatively simple physical system, snow crystals

  9. Lifespan-on-a-chip: microfluidic chambers for performing lifelong observation of C. elegans

    E-Print Network [OSTI]

    Fontana, Walter

    Lifespan-on-a-chip: microfluidic chambers for performing lifelong observation of C. elegans S on the web 18th December 2009 DOI: 10.1039/b919265d This article describes the fabrication of a microfluidic, the device includes microfluidic worm clamps, which enable periodic, temporary immobilization of each worm

  10. -The Bubble Chamber -http://thebubblechamber.org -Review: Cold War Social Science

    E-Print Network [OSTI]

    Solovey, Mark

    [1] - The Bubble Chamber - http://thebubblechamber.org - Review: Cold War Social Science Posted By Mike Thicke On July 10, 2013 @ 11:04 pm In What We're Reading | No Comments Cold War Social Science.) Palgrave Macmillan (2012) Cold War Social Science is an edited volume that serves as an ideal entrée

  11. Increased performance of single-chamber microbial fuel cells using an improved cathode structure

    E-Print Network [OSTI]

    performance. We show here that application of successive polytetrafluoroethylene (PTFE) layers (DLs), on a carbon/PTFE base layer, to the air-side of the cath- ode in a single chamber MFC significantly improved reserved. Keywords: Microbial fuel cell; Air cathode; Diffusion layer; PTFE coating; Coulombic efficiency 1

  12. IFE chamber walls: requirements, design options, and synergy with MFE plasma facing components

    E-Print Network [OSTI]

    Najmabadi, Farrokh

    is cyclic in nature and the power plant chamber wall must accom- modate the cyclic and intense photon discussed but to a lesser extent. 2. IFE operating conditions In an IFE power plant, a target is first gas may be needed to * Corresponding author. Tel.: +1-858 534 9720; fax: +1-858 822 2120. E

  13. Neutronics Assessment of Blanket Options for the HAPL Laser Inertial Fusion Energy Chamber

    E-Print Network [OSTI]

    Raffray, A. René

    Neutronics Assessment of Blanket Options for the HAPL Laser Inertial Fusion Energy Chamber M-cooled lithium blanket, a helium-cooled solid breeder blanket, and a dual-coolant lithium lead blanket; nuclear heating I. INTRODUCTION The High Average Power Laser (HAPL) program led by the Naval Research

  14. Hydrogen production using single-chamber membrane-free microbial electrolysis cells

    E-Print Network [OSTI]

    Tullos, Desiree

    Hydrogen production using single-chamber membrane-free microbial electrolysis cells Hongqiang Hu Received in revised form 13 June 2008 Accepted 17 June 2008 Published online - Keywords: Hydrogen Microbial electrohydrogenesis provides a new approach for hydrogen generation from renewable biomass. Membranes were used in all

  15. First limit from a surface run of a 10 liter Dark Matter Time Projection Chamber

    E-Print Network [OSTI]

    Caldwell, Thomas S., Jr

    2009-01-01

    A 10 liter prototype Dark Matter Time Projection Chamber (DMTPC) is operated on the surface of the earth at 75 Torr using carbon-tetrafluoride (CF4) as a target material to obtain a 24.57 gram-day exposure. A limit is set ...

  16. Numerical Analysis of a one dimensional Diffusion Equation for a single chamber Microbial Fuel Cell using

    E-Print Network [OSTI]

    Numerical Analysis of a one dimensional Diffusion Equation for a single chamber Microbial Fuel Cell generation within our society. Microbial fuel cells (MFCs) represent a new form of renewable energy using a Linked Simulation Optimization (LSO) technique E521: Advanced Numerical Methods Eric A. Zielke

  17. OPERATIONAL WINDOWS FOR DRY-WALL AND WETTED-WALL IFE CHAMBERS

    E-Print Network [OSTI]

    Raffray, A. René

    subsystems was performed parametrically to uncover key physics/technology uncertainties and to iden- tify be necessary that may preclude propagation of the laser driver and require assisted pinch transport issue for wetted-wall concepts. KEYWORDS: inertial fusion, fusion technology, IFE chambers *E

  18. Accounting & Compliance Alert: Chamber of Commerce Seeks Bigger Voice for Business in Regulatory Decisions

    E-Print Network [OSTI]

    Grissino-Mayer, Henri D.

    overrides of a company's financial reporting system, which are generally considered a red flag inspectors to do unnecessary work. The chamber says a specialized advisory panel dominated by business Reporting That Is Integrated with An Audit of Financial Statements, are effective at stopping misstatements

  19. Development of an ion drift chamber for Laser Induced Fluorescence studies 

    E-Print Network [OSTI]

    Cain, Benjamin J

    1998-01-01

    The use of Laser Induced Fluorescence to image ions in a gas has been proposed for a possible new type of subatomic particle detector.1 As a means to investigate this idea, an ion drift chamber has been developed that produces a collimated beam...

  20. ForPeerReview A climate-controlled whole-tree chamber system

    E-Print Network [OSTI]

    Boyer, Edmond

    to impose combinations of atmospheric carbon dioxide concentra- tion, [CO2], and air temperature treatments in the ambient [CO2] chambers was too low to be maintained during winter because of tree dormancy and the high natural increase in [CO2] over winter at high latitudes such as the Flakaliden site. Accurate control over

  1. Calculating Radiative Heat Transfer in an Axisymmetric Closed Chamber: An Application

    E-Print Network [OSTI]

    New York at Stoney Brook, State University of

    Calculating Radiative Heat Transfer in an Axisymmetric Closed Chamber: An Application to Crystal University of New York at Stony Brook Stony Brook N.Y. 11794 ABSTRACT Radiative heat transfer plays simulating radiative heat transfer in the crystal and in the region above the melt containing gas under

  2. Design and optimization of 6li neutron-capture pulse mode ion chamber 

    E-Print Network [OSTI]

    Chung, Kiwhan

    2009-05-15

    The purpose of this research is to design and optimize the performance of a unique, inexpensive 6Li neutron-capture pulse-mode ion chamber (LiPMIC) for neutron detection that overcomes the fill-gas contamination stemming from outgas of detector...

  3. IMPACT OF BEAM TRANSPORT METHOD ON CHAMBER AND DRIVER DESIGN FOR

    E-Print Network [OSTI]

    California at San Diego, University of

    IMPACT OF BEAM TRANSPORT METHOD ON CHAMBER AND DRIVER DESIGN FOR HEAVY ION INERTIAL FUSION ENERGY D National Laboratory, Berkeley, California 94720 W. M. SHARP Lawrence Livermore National Laboratory, Livermore, California 94550 ARIES-IFE TEAM Received June 1, 2003 Accepted for Publication February 3, 2004

  4. Report on Fission Time Projection Chamber M3FT-12IN0210052

    SciTech Connect (OSTI)

    James K. Jewell

    2012-08-01

    The Time Projection Chamber is a collaborative effort to implement an innovative approach and deliver unprecedented fission measurements to DOE programs. This 4?-detector system will provide unrivaled 3-D data about the fission process. Shown here is a half populated TPC (2?) at the LLNL TPC laboratory as it undergoes testing before being shipped to LANSCE for beam experiments.

  5. In vivo multi-modality photoacoustic and pulse echo tracking of prostate tumor growth using a window chamber

    E-Print Network [OSTI]

    Witte, Russell S.

    with a dorsal skin flap window chamber. PC-3 prostate tumor cells, expressing green fluorescent protein (GFP. Keywords: optoacoustic, ultrasound, window chamber, prostate cancer, green fluorescent protein, GFP, cancer energy pulsed laser. As light penetrates the skin, its energy is partially absorbed and converted to heat

  6. WPo4.9 SIMULATION OF IFE CHAMBER DYNAMIC RESPONSE BY A SECOND ORDER GODUNOV METHOD WITH ARBITRARY GEOMETRY

    E-Print Network [OSTI]

    Najmabadi, Farrokh

    GEOMETRY Zoran Dragojlovic and Farrokh Najmabadi Department of Electrical & Computer Engineering of chamber environment at this "long" timescale is essential in developing a rap-rated laser-fusion facility and heat conduction) on the chamber state prior to the insertion of the next target are estimated. I

  7. Applied Radiation and Isotopes 56 (2002) 953956 Sensitivity of LR115 detector in diffusion chamber to 222

    E-Print Network [OSTI]

    Yu, Peter K.N.

    2002-01-01

    Applied Radiation and Isotopes 56 (2002) 953­956 Sensitivity of LR115 detector in diffusion chamber Determination has been made of the sensitivity of LR115 type 2-track detectors (in units of m) to 222 Rn chamber. r 2002 Elsevier Science Ltd. All rights reserved. Keywords: Radon; Thoron; LR115 track detector

  8. IFE chamber dry wall materials response to pulsed X-rays and ions at power-plant level fluences

    E-Print Network [OSTI]

    Raffray, A. René

    IFE chamber dry wall materials response to pulsed X-rays and ions at power-plant level fluences T exposure at the 3Á/4 J/cm2 level, significantly below doses expected in future dry-wall power plants a collaborative investigation of the response of candidate first-wall inertial fusion energy (IFE) reactor chamber

  9. March 8, 2001 A. R. Raffray, et al., Assessment of Carbon and Tungsten Dry Chamber Walls under IFE Energy Depositions

    E-Print Network [OSTI]

    Raffray, A. René

    March 8, 2001 A. R. Raffray, et al., Assessment of Carbon and Tungsten Dry Chamber Walls under IFE March 8-9, 2001 #12;March 8, 2001 A. R. Raffray, et al., Assessment of Carbon and Tungsten Dry Chamber on analysis ­ Remaining issues #12;March 8, 2001 A. R. Raffray, et al., Assessment of Carbon and Tungsten Dry

  10. Anode-supported thin-film fuel cells operated in a single chamber configuration 2T-I-12

    E-Print Network [OSTI]

    Haile, Sossina M.

    on the anode, producing a complex response in fuel cell power output. Under optimized gas compositions and flowAnode-supported thin-film fuel cells operated in a single chamber configuration 2T-I-12 Zongping of anode-supported, thin-film, single chamber fuel cells (SCFCs) have been investigated. Cells, in which Ni

  11. Nov 5-9, 2006 IAEA meeting, Vienna, Austria Target and Chamber Technologies for Direct-Drive

    E-Print Network [OSTI]

    Raffray, A. René

    Nov 5-9, 2006 IAEA meeting, Vienna, Austria 1 Target and Chamber Technologies for Direct-Drive cycle) Dry wall chamber (armor must accommodate ion+photon threat and provide required lifetime) · Multi-institution Activities led by NRL with the Goal of Developing a New Energy Source: IFE Based on Lasers, Direct Drive

  12. Casting 12 BioRad Mini SDS PAGE Gels 1. Assemble multicasting chamber. Make sure ALL plates and spacers are flush with bottom. Clean

    E-Print Network [OSTI]

    Aris, John P.

    120 Casting 12 BioRad Mini SDS PAGE Gels 1. Assemble multicasting chamber. Make sure ALL plates, disassemble casting chamber. Carefully separate gels. Rinse with ddH2O. Remove excess polyacrylamide. Place

  13. Effects of chamber pressure variation on the grid temperature in an inertial electrostatic confinement device

    SciTech Connect (OSTI)

    Murali, S. Krupakar [Lawrenceville Plasma Physics, 128 Lincoln Blvd., Middlesex, New Jersey 08846 (United States); Emmert, G. A.; Santarius, J. F.; Kulcinski, G. L. [Fusion Technology Institute, University of Wisconsin, 1500 Engineering Drive, Madison, Wisconsin 53706 (United States)

    2010-10-15

    Inertial electrostatic confinement fusion devices are compact sources of neutrons, protons, electrons, and x rays. Such sources have many applications. Improving the efficiency of the device also increases the applications of this device. Hence a thorough understanding of the operation of this device is needed. In this paper, we study the effect of chamber pressure on the temperature of the cathode. Experimentally, the grid temperature decreases as the chamber pressure increases; numerical simulations suggest that this is caused by the reduction of the hot ion current to the cathode as the pressure increases for constant power supply current. Such an understanding further supports the conclusion that the asymmetric heating of the cathode can be decreased by homogenizing the ion flow around the cathode.

  14. The Drift Chamber for the Experiment to Study the Nature of the Confinement

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

    Berdnikov, Vladimir V.; Somov, S. V.; Pentchev, Lubomir; Zihlmann, Benedikt

    2015-01-01

    The GlueX experiment was designed to search for hybrid mesons with exotic quantum numbers using a beam of linearly polarized photons incident on a liquid hydrogen target. The spectrum of these states and their mass splitting from normal mesons may yield information on confinement. The description of the GlueX spectrometer and Forward Drift Chambers (FDC) as a part of track reconstruction system is presented in the text. FDC‘s are multiwire chambers with cathode and anode read-out. The system allows reconstructing tracks of charged particles with ~200mkm accuracy with angles from 20° up to 1°. One of the detector features ismore »1.64% X0 material amount in the active area. The cathode gain calibration procedure is presented. The results of such calibration using cosmic data and beam data are presented as well.« less

  15. Neutron and gamma detector using an ionization chamber with an integrated body and moderator

    DOE Patents [OSTI]

    Ianakiev, Kiril D.; Swinhoe, Martyn T.; Lestone, John Paul

    2006-07-18

    A detector for detecting neutrons and gamma radiation includes a cathode that defines an interior surface and an interior volume. A conductive neutron-capturing layer is disposed on the interior surface of the cathode and a plastic housing surrounds the cathode. A plastic lid is attached to the housing and encloses the interior volume of the cathode forming an ionization chamber, into the center of which an anode extends from the plastic lid. A working gas is disposed within the ionization chamber and a high biasing voltage is connected to the cathode. Processing electronics are coupled to the anode and process current pulses which are converted into Gaussian pulses, which are either counted as neutrons or integrated as gammas, in response to whether pulse amplitude crosses a neutron threshold. The detector according to the invention may be readily fabricated into single or multilayer detector arrays.

  16. A study of electromagnetic showers in the high density projection chamber

    SciTech Connect (OSTI)

    Albrecht, E.; Berggren, M.; Cattai, A.; Fischer, H.G.; Flammier, M.; Gerutti, G.; Innocenti, P.G.; Iversen, P.S.

    1983-02-01

    A prototype module of a High density Projection Chamber (HPC) has been tested in an electron beam. The HPC, with the shower conversion separated from the charge collection, offers a simple, homogeneous large volume detector with an energy resolution of 12.5%/..sqrt..E and an exceptionally fine granularity both along and transverse to the shower axis. The results from the test are presented together with a description of the calorimeter system.

  17. Apparatus for monitoring tritium in tritium contaminating environments using a modified Kanne chamber

    DOE Patents [OSTI]

    Anderson, David F. (Los Alamos, NM)

    1984-01-01

    A conventional Kanne tritium monitor has been redesigned to reduce its sensitivity to such contaminants as tritiated water vapor and tritiated oil. The high voltage electrode has been replaced by a wire cylinder and the collector electrode has been reduced in diameter. The area sensitive to contamination has thereby been reduced by about a factor of forty while the overall apparatus sensitivity and operation has not been affected. The design allows for in situ decontamination of the chambers, if necessary.

  18. Apparatus for monitoring tritium in tritium-contaminating environments using a modified Kanne chamber

    DOE Patents [OSTI]

    Anderson, D.F.

    1981-01-27

    A conventional Kanne tritium monitor has been redesigned to reduce its sensitivity to such contaminants as tritiated water vapor and tritiated oil. The high voltage electrode has been replaced by a wire cylinder and the collector electrode has been reduced in diameter. The area sensitive to contamination has thereby been reduced by about a factor of forty while the overall apparatus sensitivity and operation has not been affected. The design allows for in situ decontamination of the chambers, if necessary.

  19. A Multiwire Proportional Chamber for Precision Studies of Neutron Beta Decay Angular Correlations

    E-Print Network [OSTI]

    T. M. Ito; R. Carr; B. W. Filippone; J. W. Martin; B. Plaster; G. Rybka; J. Yuan

    2007-02-10

    A new multiwire proportional chamber (MWPC) was designed and constructed for precision studies of neutron beta decay angular correlations. Its design has several novel features, including the use of low pressure neopentane as the MWPC gas and an entrance window made of thin Mylar sheet reinforced with Kevlar fibers. In the initial off-line performance tests, the gas gain of neopentane and the position resolution were studied.

  20. Small-Chamber Measurements of Chemical-Specific Emission Factors for Drywall

    SciTech Connect (OSTI)

    Maddalena, Randy; Russell, Marion; Apte, Michael G.

    2010-06-01

    Imported drywall installed in U.S. homes is suspected of being a source of odorous and potentially corrosive indoor pollutants. To support an investigation of those building materials by the Consumer Products Safety Commission (CPSC), Lawrence Berkeley National Laboratory (LBNL) measured chemical-specific emission factors for 30 samples of drywall materials. Emission factors are reported for 75 chemicals and 30 different drywall samples encompassing both domestic and imported stock and incorporating natural, synthetic, or mixed gypsum core material. CPSC supplied all drywall materials. First the drywall samples were isolated and conditioned in dedicated chambers, then they were transferred to small chambers where emission testing was performed. Four sampling and analysis methods were utilized to assess (1) volatile organic compounds, (2) low molecular weight carbonyls, (3) volatile sulfur compounds, and (4) reactive sulfur gases. LBNL developed a new method that combines the use of solid phase microextraction (SPME) with small emission chambers to measure the reactive sulfur gases, then extended that technique to measure the full suite of volatile sulfur compounds. The testing procedure and analysis methods are described in detail herein. Emission factors were measured under a single set of controlled environmental conditions. The results are compared graphically for each method and in detailed tables for use in estimating indoor exposure concentrations.

  1. Microwave remote plasma enhanced-atomic layer deposition system with multicusp confinement chamber

    SciTech Connect (OSTI)

    Dechana, A.; Thamboon, P.; Boonyawan, D.

    2014-10-15

    A microwave remote Plasma Enhanced-Atomic Layer Deposition system with multicusp confinement chamber is established at the Plasma and Beam Physics research facilities, Chiang Mai, Thailand. The system produces highly-reactive plasma species in order to enhance the deposition process of thin films. The addition of the multicusp magnetic fields further improves the plasma density and uniformity in the reaction chamber. Thus, the system is more favorable to temperature-sensitive substrates when heating becomes unwanted. Furthermore, the remote-plasma feature, which is generated via microwave power source, offers tunability of the plasma properties separately from the process. As a result, the system provides high flexibility in choice of materials and design experiments, particularly for low-temperature applications. Performance evaluations of the system were carried on coating experiments of Al{sub 2}O{sub 3} layers onto a silicon wafer. The plasma characteristics in the chamber will be described. The resulted Al{sub 2}O{sub 3} films—analyzed by Rutherford Backscattering Spectrometry in channeling mode and by X-ray Photoelectron Spectroscopy techniques—will be discussed.

  2. Performance studies of resistive Micromegas chambers for the upgrade of the ATLAS Muon Spectrometer

    E-Print Network [OSTI]

    Ntekas, Konstantinos; The ATLAS collaboration

    2015-01-01

    The ATLAS collaboration at LHC has endorsed the resistive Micromegas technology (MM), along with the small-strip Thin Gap Chambers (sTGC), for the high luminosity upgrade of the first muon station in the high-rapidity region, the so called New Small Wheel (NSW) project. The NSW requires fully efficient MM chambers, up to a particle rate of $\\sim15\\,\\mathrm{kHz/cm^2}$, with spatial resolution better than $100\\,\\mu\\mathrm{m}$ independent of the track incidence angle and the magnetic field ($B \\leq 0.3\\,\\mathrm{T}$). Along with the precise tracking the MM should be able to provide a trigger signal, complementary to the sTGC, thus a decent timing resolution is required. Several tests have been performed on small ($10\\times10\\,\\mathrm{cm^2}$) MM chambers using medium ($10\\,\\mathrm{GeV/c}$, PS) and high ($150\\,\\mathrm{GeV/c}$, SPS) momentum hadron beams at CERN. Results on the efficiency and position resolution measured during these tests are presented demonstrating the excellent characteristics of the MM that fulf...

  3. Polymer Growth Rate in a Wire Chamber with Oxygen,Water, or Alcohol Gas Additives

    SciTech Connect (OSTI)

    Boyarski, Adam; /SLAC

    2008-07-02

    The rate of polymer growth on wires was measured in a wire chamber while the chamber was aged initially with helium-isobutane (80:20) gas, and then with either oxygen, water, or alcohol added to the gas. At the completion of the aging process for each gas mixture, the carbon content on the wires was measured in a SEM/EDX instrument. The same physical wires were used in all the gas mixtures, allowing measurement of polymer build up or polymer depletion by each gas additive. It is found that the rate of polymer growth is not changed by the presence of oxygen, water or alcohol. Conjecture that oxygen reduces breakdown by removing polymer deposits on field wires is negated by these measurements. Instead, it appears that the reduced breakdown is due to lower resistance in the polymer from oxygen ions being transported into the polymer. It is also observed that field wires bombarded by the electrons in the SEM and then placed back into the chamber show an abundance of single electrons being emitted, indicating that electron charge is stored in the polymer layer and that a high electric field is necessary to remove the charge.

  4. Interpretation of Secondary Organic Aerosol Formation from Diesel Exhaust Photooxidation in an Environmental Chamber

    SciTech Connect (OSTI)

    Nakao, Shunsuke; Shrivastava, ManishKumar B.; Nguyen, Anh; Jung, Hee-Jung; Cocker, David R.

    2011-04-14

    Secondary organic aerosol (SOA) formation from diesel exhaust in a smog chamber was investigated. Particle volume measurement based on mobility diameter is shown to underestimate SOA formation from diesel exhaust due to the external void space of agglomerate particles, in which case mass-based measurement technique is necessary. Rapid determination of particle effective density as a function of particle mass was performed by an Aerosol Particle Mass analyzer – Scanning Mobility Particle Sizer (APM-SMPS) to obtain particle mass concentration and fractal dimension. Continuous aging of aerosol was observed in terms of atomic ratio (O/C), from 0.05 to 0.25 in 12 hours, underscoring the importance of multi-generational oxidation of low-volatile organic vapors emitted from diesel engine as the significant source of oxygenated SOA. Experimental conditions possibly have strong impacts on physical evolution of diesel particulates in a smog chamber. Higher particle effective densities were observed when raw exhaust was injected into a full bag as opposed to filling a bag with diluted exhaust using an ejector diluter. When longer transfer line was used for injecting diesel exhaust into the smog chamber, rapid particle coagulation was observed, leading to increasing particle volume concentration in dark while its mass concentration is decreasing.

  5. Evaluation of tecniques for controlling UF/sub 6/ release clouds in the GAT environmental chamber

    SciTech Connect (OSTI)

    Lux, C.J.

    1982-01-01

    Studies designed to characterize the reaction between UF/sub 6/ and atmospheric moisture, evaluate environmental variables of UF/sub 6/ cloud formation and ultimate cloud fate, and UF/sub 6/ release cloud control procedure have been conducted in the 1200 cu. ft. GAT environmental chamber. In earlier chamber experiments, 30 separate UF/sub 6/ release tests indicated that variations of atmospheric conditions and sample sizes had no significant effect on UO/sub 2/F/sub 2/ particle size distribution, release cloud formation, or cloud settling rates. During the past year, numerous procedures have been evaluated for accelerating UF/sub 6/ cloud knockdown in a series of 37 environmental chamber releases. Knockdown procedures included: coarse water spray; air jet; steam spray (electrostatically charged and uncharged); carbon dioxide; Freon-12; fine water mist (uncharged); boric acid mist (charged and uncharged); and an ionized dry air stream. UF/sub 6/ hydrolysis cloud settling rates monitored by a laser/powermeter densitometer, indicated the relative effectiveness of various cloud knockdown techniques. Electrostatically charged boric acid/water mist, and electrostatically ionized dry air were both found to be very effective, knocking down the UO/sub 2/F/sub 2/ release cloud particles in two to five minutes. Work to adapt these knockdown techniques for use under field conditions is continuing, taking into account recovery of the released uranium as well as nuclear criticality constraints.

  6. Particle tracking in kaon electroproduction with cathode-charge sampling in multi-wire proportional chambers

    E-Print Network [OSTI]

    P. Achenbach; C. Ayerbe Gayoso; J. C. Bernauer; R. Böhm; D. Bosnar; M. Bösz; L. Debenjak; M. O. Distler; A. Esser; I. Friš?i?; M. Gómez Rodríguez de la Paz; M. Makek; H. Merkel; U. Müller; L. Nungesser; J. Pochodzalla; M. Potokar; S. Sánchez Majos; B. S. Schlimme; S. Širca; M. Weinriefer

    2011-04-21

    Wire chambers are routinely operated as tracking detectors in magnetic spectrometers at high-intensity continuous electron beams. Especially in experiments studying reactions with small cross-sections the reaction yield is limited by the background rate in the chambers. One way to determine the track of a charged particle through a multi-wire proportional chamber (MWPC) is the measurement of the charge distribution induced on its cathodes. In practical applications of this read-out method, the algorithm to relate the measured charge distribution to the avalanche position is an important factor for the achievable position resolution and for the track reconstruction efficiency. An algorithm was developed for operating two large-sized MWPCs in a strong background environment with multiple-particle tracks. Resulting efficiencies were determined as a function of the electron beam current and on the signal amplitudes. Because of the different energy-losses of pions, kaons, and protons in the momentum range of the spectrometer the efficiencies depend also on the particle species.

  7. Steam supply system for superposed turbine and process chamber, such as coal gasification

    SciTech Connect (OSTI)

    Menger, W.M.

    1986-08-26

    A steam supply system is described for a process chamber consuming superheated steam at a pressure of about 600 psi or below which is driven by a boiler operating at a pressure of about 2000 psi, a pressure range above that needed by the process chamber for also driving a superposed turbine. The system consists of: (a) a high pressure boiler feed pump for supplying highly purified water to the boiler; (b) a condensing reboiler connected to receive steam from the superposed turbine in a high pressure side; (c) the condensing reboiler also having a low pressure side, essentially isolated from fluid contact with the high pressure side, for receiving water for use in the lower operating pressure steam processes; (d) the condensing reboiler further comprising integral superheating means for heating the water received in the low pressure side into superheated low pressure steam with the steam received in the high pressure side; (e) means for conveying fluid from the high pressure side of the condensing reboiler to the boiler feed pump; and (f) means for conveying the low pressure superheated steam from the condensing reboiler to the process chamber.

  8. Comparative study of ionization chamber detectors vis-a-vis a CCD detector for dispersive XAS measurement in transmission geometry

    SciTech Connect (OSTI)

    Poswal, A. K.; Agrawal, A.; Bhattachryya, D.; Jha, S. N.; Sahoo, N. K.

    2013-02-05

    We have designed and fabricated parallel plate ionization chamber detectors and voltage vs. current characteristics (V-I curve) of the detectors were recorded with synchrotron radiation to qualify for use in X-ray Absorption Spectroscopy (XAS) measurements. After qualifying the ionization chambers, the detectors were used in the dispersive EXAFS beamline (BL-08) at INDUS-2 SRS in Turbo-XAS geometry. Using the same setup and under the same setting, XAS spectra were also recorded with a CCD detector and the observation on relative performance of the ionization chamber vis-a-vis the CCD detector is presented in this paper.

  9. Threshold bubble chamber for measurement of knock-on DT neutron tails from magnetic and inertial confinement experiments

    SciTech Connect (OSTI)

    Fisher, R.K. [General Atomics, San Diego, CA (United States); Zaveryaev, V.S. [Russian Research Centre, Moscow (Russian Federation). Kurchatov Institute; Trusillo, S.V. [Russian Federal Nuclear Centre, Arzamas (Russian Federation). Experimental Physics Institute

    1996-07-01

    We propose a new {open_quotes}threshold{close_quotes} bubble chamber detector for measurement of knock-on neutron tails. These energetic neutrons result from fusion reactions involving energetic fuel ions created by alpha knock-on collisions in tokamak and other magnetic confinement experiments, and by both alpha and neutron knock-on collisions in inertial confinement fusion (ICF) experiments. The energy spectrum of these neutrons will yield information on the alpha population and energy distribution in tokamaks, and on alpha target physics and {rho}R measurements in ICF experiments. The bubble chamber should only detect neutrons with energies above a selectable threshold energy controlled by the bubble chamber pressure. The bubble chamber threshold mechanism, detection efficiency, and proposed applications to the International Thermonuclear Experimental Reactor (ITER) and National Ignition Facility (NIF) experiments will be discussed.

  10. Design and Construction of Large Size Micromegas Chambers for the Upgrade of the ATLAS Muon Spectrometer

    E-Print Network [OSTI]

    Philipp Lösel; Ralph Müller

    2015-08-11

    Large area Micromegas detectors will be employed for the first time in high-energy physics experiments. A total surface of about $\\mathbf{150~m^2}$ of the forward regions of the Muon Spectrometer of the ATLAS detector at LHC will be equipped with 8-layer Micromegas modules. Each layer covers more than $\\mathbf{2~m^2}$ for a total active area of $\\mathbf{1200~m^2}$. Together with the small strip Thin Gap Chambers they will compose the two New Small Wheels, which will replace the innermost stations of the ATLAS endcap muon tracking system in the 2018/19 shutdown. In order to achieve a 15$\\mathbf{\\%}$ transverse momentum resolution for $\\mathbf{1~TeV}$ muons, in addition to an excellent intrinsic resolution, the mechanical precision of each plane of the assembled module must be as good as $\\mathbf{30~\\mu m}$ along the precision coordinate and $\\mathbf{80~\\mu m}$ perpendicular to the chamber. The design and construction procedure of the Micromegas modules will be presented, as well as the design for the assembly of modules onto the New Small Wheel. Emphasis will be on the methods developed to achieve the challenging mechanical precision. Measurements and simulations of deformations created on chamber prototypes as a function of thermal gradients, internal stress (mesh tension and module fixation on supports) and gas over-pressure were essential in the development of the final design. During installation and operation all deformations and relative misalignments will be monitored by an optical alignment system and compensated in the tracking software.

  11. Verifying Sensor Response to Difficult Chemicals with a New Test Chamber Concept

    SciTech Connect (OSTI)

    Maughan, A. D.; Birnbaum, Jerome C.; Probasco, Kathleen M.

    2004-06-01

    In this article we discuss the application of technology innovations to optimize detection of hard-to-measure (less- or semi-volatile) compounds. These chemicals are found all around us: in pesticides and herbicides, the higher boiling polyaromatic hydrocarbons in diesel exhaust, and linked polyurethane foams in products ranging from hiking boots to acoustic ceilings. They appear in low concentrations and evaporate very slowly. These heavier chemicals are rarely measured accurately because they stick to surfaces and sampling equipment and, consequently, are not reliably sampled or delivered to analytical detectors. It’s like trying to identify cold, sticky honey by getting it to flow in through a sampling tube to a detector –it will hardly move. Honey generally coats out on surfaces and sample lines to the extent that even if it is detected, the amount present is vastly underestimated. Researchers at Pacific Northwest National Laboratory (PNNL) addressed the problem by developing a chamber facility with instrumentation that can overcome the under-reporting of these ubiquitous chemical compounds. The atmospheric chemistry chamber provides a controlled environment in which to certify the accuracy of and conditions under which sensors can best respond to volatile and semi-volatile chemicals. The facility is designed to handle and measure chemicals at the levels at which they are found in nature. Test environments can be created in which atmospheric concentrations are at low part-per-trillion concentrations. These concentrations are equivalent to an herbicide off-gassing from a commercially grown apple. The chamber can be set up to simulate releases ranging from industrial vents with high concentrations to releases from surfaces, soils, and/or vegetation where the concentrations are low.

  12. Scintillation Pulse Shape Discrimination in a Two-Phase Xenon Time Projection Chamber

    E-Print Network [OSTI]

    J. Kwong; P. Brusov; T. Shutt; C. E. Dahl; A. I. Bolozdynya; A. Bradley

    2009-08-06

    The energy and electric field dependence of pulse shape discrimination in liquid xenon have been measured in a 10 gm two-phase xenon time projection chamber. We have demonstrated the use of the pulse shape and charge-to-light ratio simultaneously to obtain a leakage below that achievable by either discriminant alone. A Monte Carlo is used to show that the dominant fluctuation in the pulse shape quantity is statistical in nature, and project the performance of these techniques in larger detectors. Although the performance is generally weak at low energies relevant to elastic WIMP recoil searches, the pulse shape can be used in probing for higher energy inelastic WIMP recoils.

  13. PICASSO, COUPP and PICO - Search for dark matter with bubble chambers

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

    Amole, C.; Ardid, M.; Asner, D. M.; Baxter, D.; Behnke, E.; Bhattacharjee, P.; Borsodi, H.; Bou-Cabo, M.; Brice, S. J.; Broemmelsiek, D.; et al

    2015-05-29

    The PICASSO and COUPP collaborations use superheated liquid detectors to search for cold dark matter through the direct detection of weakly interacting massive particles (WIMPs). These experiments, located in the underground laboratory of SNOLAB, Canada, detect phase transitions triggered by nuclear recoils in the keV range induced by interactions with WIMPs. We present details of the construction and operation of these detectors as well as the results, obtained by several years of observations. We also introduce PICO, a joint effort of the two collaborations to build a second generation ton-scale bubble chamber with 250 liters of active liquid.

  14. High-Rate Glass Resistive Plate Chambers For LHC Muon Detectors Upgrade

    E-Print Network [OSTI]

    Laktineh, I; Cauwenbergh, S; Combret, C; Crotty, I; Haddad, Y; Grenier, G; Guida, R; Kieffer, R; Lumb, N; Mirabito, L; Schirra, F; Seguin, N; Tytgat, M; Van der Donckt, M; Wang, Y; Zaganidis, N

    2012-01-01

    The limitation of the detection rate of standard bakelite resistive plate chambers (RPC) used as muon detector in LHC experiments is behind the absence of such detectors in the high TJ regions in both CMS and ATLAS detectors. RPCs made with low resistivity glass plates (10ID O.cm) could be an adequate solution to equip the high TJ regions extending thus both the trigger efficiency and the physics performance. Different beam tests with single and multi-gap configurations using the new glass have shown that such detectors can operate at few thousands Hzlcm2 with high efficiency( > 90%).

  15. Direct measurement of the impulse in a magnetic thrust chamber system for laser fusion rocket

    SciTech Connect (OSTI)

    Maeno, Akihiro; Yamamoto, Naoji; Nakashima, Hideki [Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1 Kasuga-kouen, Kasuga, Fukuoka 816-8580 (Japan); Fujioka, Shinsuke; Johzaki, Tomoyuki [Institute of Laser Engineering, Osaka University, Suita, Osaka 565-087 (Japan); Mori, Yoshitaka [Graduate School for the Creation of New Photonics Industries, Hamamatsu, Shizuoka 431-1202 (Japan); Sunahara, Atsushi [Institute for Laser Technology, Suita, Osaka 565-087 (Japan)

    2011-08-15

    An experiment is conducted to measure an impulse for demonstrating a magnetic thrust chamber system for laser fusion rocket. The impulse is produced by the interaction between plasma and magnetic field. In the experiment, the system consists of plasma and neodymium permanent magnets. The plasma is created by a single-beam laser aiming at a polystyrene spherical target. The impulse is 1.5 to 2.2 {mu}Ns by means of a pendulum thrust stand, when the laser energy is 0.7 J. Without magnetic field, the measured impulse is found to be zero. These results indicate that the system for generating impulse is working.

  16. Development of time projection chamber for precise neutron lifetime measurement using pulsed cold neutron beams

    E-Print Network [OSTI]

    Y. Arimoto; N. Higashi; Y. Igarashi; Y. Iwashita; T. Ino; R. Katayama; R. Kitahara; M. Kitaguchi; H. Matsumura; K. Mishima; H. Oide; H. Otono; R. Sakakibara; T. Shima; H. M. Shimizu; T. Sugino; N. Sumi; H. Sumino; K. Taketani; G. Tanaka; M. Tanaka; K. Tauchi; A. Toyoda; T. Yamada; S. Yamashita; H. Yokoyama; T. Yoshioka

    2015-09-11

    A new time projection chamber (TPC) was developed for neutron lifetime measurement using a pulsed cold neutron spallation source at the Japan Proton Accelerator Research Complex (J-PARC). Managing considerable background events from natural sources and the beam radioactivity is a challenging aspect of this measurement. To overcome this problem, the developed TPC has unprecedented features such as the use of polyether-ether-ketone plates in the support structure and internal surfaces covered with $^6$Li-enriched tiles to absorb outlier neutrons. In this paper, the design and performance of the new TPC are reported in detail.

  17. A patient-specific quality assurance study on absolute dose verification using ionization chambers of different volumes in RapidArc treatments

    SciTech Connect (OSTI)

    Syam Kumar, S.A., E-mail: skppm@rediffmail.com [Department of Medical Physics, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu (India); Sukumar, Prabakar; Sriram, Padmanaban; Rajasekaran, Dhanabalan; Aketi, Srinu; Vivekanandan, Nagarajan [Department of Medical Physics, Cancer Institute (WIA), Adyar, Chennai, Tamil Nadu (India)

    2012-01-01

    The recalculation of 1 fraction from a patient treatment plan on a phantom and subsequent measurements have become the norms for measurement-based verification, which combines the quality assurance recommendations that deal with the treatment planning system and the beam delivery system. This type of evaluation has prompted attention to measurement equipment and techniques. Ionization chambers are considered the gold standard because of their precision, availability, and relative ease of use. This study evaluates and compares 5 different ionization chambers: phantom combinations for verification in routine patient-specific quality assurance of RapidArc treatments. Fifteen different RapidArc plans conforming to the clinical standards were selected for the study. Verification plans were then created for each treatment plan with different chamber-phantom combinations scanned by computed tomography. This includes Medtec intensity modulated radiation therapy (IMRT) phantom with micro-ionization chamber (0.007 cm{sup 3}) and pinpoint chamber (0.015 cm{sup 3}), PTW-Octavius phantom with semiflex chamber (0.125 cm{sup 3}) and 2D array (0.125 cm{sup 3}), and indigenously made Circular wax phantom with 0.6 cm{sup 3} chamber. The measured isocenter absolute dose was compared with the treatment planning system (TPS) plan. The micro-ionization chamber shows more deviations when compared with semiflex and 0.6 cm{sup 3} with a maximum variation of -4.76%, -1.49%, and 2.23% for micro-ionization, semiflex, and farmer chambers, respectively. The positive variations indicate that the chamber with larger volume overestimates. Farmer chamber shows higher deviation when compared with 0.125 cm{sup 3}. In general the deviation was found to be <1% with the semiflex and farmer chambers. A maximum variation of 2% was observed for the 0.007 cm{sup 3} ionization chamber, except in a few cases. Pinpoint chamber underestimates the calculated isocenter dose by a maximum of 4.8%. Absolute dose measurements using the semiflex ionization chamber with intermediate volume (0.125 cm{sup 3}) shows good agreement with the TPS calculated among the detectors used in this study. Positioning is very important when using smaller volume chambers because they are more sensitive to geometrical errors within the treatment fields. It is also suggested to average the dose over the sensitive volume for larger-volume chambers. The ionization chamber-phantom combinations used in this study can be used interchangeably for routine RapidArc patient-specific quality assurance with a satisfactory accuracy for clinical practice.

  18. Performance Studies of Micromegas Chambers for the New Small Wheel Upgrade Project

    E-Print Network [OSTI]

    Ntekas, Konstantinos; The ATLAS collaboration

    2015-01-01

    Micromegas, an abbreviation for Micro MEsh Gaseous Structure (MM), is a robust detector with excellent spatial resolution and high rate capability. An $R\\&D$ activity, called Muon ATLAS MicroMegas Activity (MAMMA), was initiated in 2007 in order to explore the potential of the MM technology for use in the ATLAS experiment. After several years of prototyping and testing, the ATLAS collaboration has chosen the MM technology along with the small-strip Thin Gap Chambers (sTGC) for the upgrade of the inner muon station in the high-rapidity region, the so called New Small Wheel (NSW) upgrade project. It will employ eight layers of MM and eight layers of sTGC detectors per wheel. The NSW project requires fully efficient MM chambers, able to cope with the maximum expected rate of $15\\,\\mathrm{kHz/cm^2}$ featuring single plane spatial resolution better than $100\\,\\mu\\mathrm{m}$. The MM detectors will cover a total active area of $\\sim1200\\,\\mathrm{m^2}$ and will be operated in a moderate magnetic field with intens...

  19. Study of the performance of the MicroMegas chambers for the ATLAS Muon Spectrometer Upgrade

    E-Print Network [OSTI]

    Vanadia, Marco; The ATLAS collaboration

    2015-01-01

    Micromegas (MICRO MEsh GAseous Structure) chambers are Micro-Pattern Gaseous Detectors designed to provide a high spatial resolution in highly irradiated environments. In 2007 an ambitious long-term R&D activity was started in the context of the ATLAS experiment, at CERN: the Muon ATLAS Micromegas Activity (MAMMA). After years of tests on prototypes and technology breakthroughs, Micromegas chambers were chosen as tracking detectors for an upgrade of the ATLAS Muon Spectrometer. These novel detectors will be installed in 2018 and 2019 during the second long shutdown of the Large Hadron Collider, and will serve as precision detectors in the innermost part of the ATLAS Muon Spectrometer. Eight layers of Micromegas modules of unprecedented size, up to 3 $\\rm{{m^2}}$, will cover a surface of 150 $\\rm{{m^2}}$ for a total active area of about 1200 $\\rm{{m^2}}$. This upgrade will be crucial to ensure high quality performance for the ATLAS Muon Spectrometer in view of the third run of the Large Hadron Collider and...

  20. Method And Apparatus For Launching Microwave Energy Into A Plasma Processing Chamber

    DOE Patents [OSTI]

    DOUGHTY, FRANK C.; [et al

    2001-05-01

    A method and apparatus for launching microwave energy to a plasma processing chamber in which the required magnetic field is generated by a permanent magnet structure and the permanent magnet material effectively comprises one or more surfaces of the waveguide structure. The waveguide structure functions as an impedance matching device and controls the field pattern of the launched microwave field to create a uniform plasma. The waveguide launcher may comprise a rectangular waveguide, a circular waveguide, or a coaxial waveguide with permanent magnet material forming the sidewalls of the guide and a magnetization pattern which produces the required microwave electron cyclotron resonance magnetic field, a uniform field absorption pattern, and a rapid decay of the fields away from the resonance zone. In addition, the incorporation of permanent magnet material as a portion of the waveguide structure places the magnetic material in close proximity to the vacuum chamber, allowing for a precisely controlled magnetic field configuration, and a reduction of the amount of permanent magnet material required.

  1. Design and Construction of Large Size Micromegas Chambers for the Upgrade of the ATLAS Muon Spectrometer

    E-Print Network [OSTI]

    Lösel, Philipp

    2015-01-01

    Large area Micromegas detectors will be employed for the first time in high-energy physics experiments. A total surface of about $\\mathbf{150~m^2}$ of the forward regions of the Muon Spectrometer of the ATLAS detector at LHC will be equipped with 8-layer Micromegas modules. Each layer covers more than $\\mathbf{2~m^2}$ for a total active area of $\\mathbf{1200~m^2}$. Together with the small strip Thin Gap Chambers they will compose the two New Small Wheels, which will replace the innermost stations of the ATLAS endcap muon tracking system in the 2018/19 shutdown. In order to achieve a 15$\\mathbf{\\%}$ transverse momentum resolution for $\\mathbf{1~TeV}$ muons, in addition to an excellent intrinsic resolution, the mechanical precision of each plane of the assembled module must be as good as $\\mathbf{30~\\mu m}$ along the precision coordinate and $\\mathbf{80~\\mu m}$ perpendicular to the chamber. The design and construction procedure of the Micromegas modules will be presented, as well as the design for the assembly ...

  2. Experimental and theoretical evaluation of a toroidal combustion chamber for stratified-charge engines

    SciTech Connect (OSTI)

    Quiros, E.N.; Adams, J.W.; Otis, D.R.; Myers, P.S.

    1990-03-02

    Maximum efficiency of cyclic combustion engines (CCE) is achieved when using stratified charge and high compression ratio with controlled air circulation and combustion. A description is given of a varying-area, toroidal-shaped combustion chamber designed to achieve the above objectives by: obtaining initial circulatory air motion induced by the piston late in the compression stroke; increasing this piston-induced velocity using the momentum of fuel injected tangentially to the center line of the toroid; and by using combustion to further increase the circulation rate. Four combustion chamber configurations were studied in a bomb with zero initial air velocity to ascertain whether significant rotation could be achieved by injection and combustion. Gas pressure was measured and high speed photographs were taken of the injection and combustion process. The ideal situation, at full load, is to have one rotation of the gas during the time allocated to combustion. The experimental results, with zero initial velocity, show that fuel momentum plus combustion produces from one-half to three-quarters of a rotation in the available time. Modeling suggests that the use of initial, piston-induced velocities would result in the desired one rotation in the available time.

  3. A Proposal for a Ton Scale Bubble Chamber for Dark Matter Detection

    SciTech Connect (OSTI)

    Collar, Juan; Dahl, C.Eric; Fustin, Drew; Robinson, Alan; Behnke, Ed; Behnke, Joshua; Breznau, William; Connor, Austin; Kuehnemund, Emily Grace; Levine, Ilan; Moan, Timothy; /Indiana U., South Bend /Fermilab

    2010-10-07

    The nature of non-baryonic dark matter is one of the most intriguing questions for particle physics at the start of the 21st century. There is ample evidence for its existence, but almost nothing is known of its properties. WIMPs are a very appealing candidate particle and several experimental campaigns are underway around the world to search for these particles via the nuclear recoils that they should induce. The COUPP series of bubble chambers has played a significant role in the WIMP search. Through a sequence of detectors of increasing size, a number of R&D issues have arisen and been solved, and the technology has now been advanced to the point where the construction of large chambers requires a modest research effort, some development, but mostly just engineering. It is within this context that we propose to build the next COUPP detector - COUPP-500, a ton scale device to be built over the next three years at Fermilab and then deployed deep underground at SNOLAB. The primary advantages of the COUPP approach over other technologies are: (1) The ability to reject electron and gamma backgrounds by arranging the chamber thermodynamics such that these particles do not even trigger the detector. (2) The ability to suppress neutron backgrounds by having the radioactively impure detection elements far from the active volume and by using the self-shielding of a large device and the high granularity to identify multiple bubbles. (3) The ability to build large chambers cheaply and with a choice of target fluids. (4) The ability to increase the size of the chambers without changing the size or complexity of the data acquisition. (5) Sensitivity to spin-dependent and spin-independent WIMP couplings. These key advantages should enable the goal of one background event in a ton-year of exposure to be achieved. The conceptual design of COUPP-500 is scaled from the preceding devices. In many cases all that is needed is a simple scaling up of components previously used. Calibration and R&D are still needed on some aspects of the system. We know we have the ability to distinguish alpha-induced events from nuclear recoils, but we do not yet know whether the combination of material purity and rejection are good enough to run for a year with no alpha background. We also need to have more detailed measurements of the detector threshold and a better understanding of its high gamma rejection. In addition, there are important checks to make on the longevity of the detector components in the hydraulic fluid and on the chemistry of the active fluid. The 2009 PASAG report explicitly supported the construction of the COUPP-500 device in all funding scenarios. The NSF has shown similar enthusiasm. It awarded one of its DUSEL S4 grants to assist in the engineering needed to build COUPP-500. The currently estimated cost of COUPP-500 is $8M, about half the $15M-$20M price tag expected by the PASAG report for a next generation dark matter search experiment. The COUPP-500 device will have a spin independent WIMP-nucleus cross-section sensitivity of 6 x 10{sup -47} cm{sup 2} after a background-free year of running. This device should then provide the benchmark against which all other WIMP searches are measured.

  4. Determination of Correction Factors for Small Field Based on Measurement and Numerical Calculation using Cylindrical Ionization Chambers

    E-Print Network [OSTI]

    Park, Kwangwoo; Park, Sungho; Choi, Jin Hwa; Park, Suk Won; Bak, Jino

    2015-01-01

    We studied the investigation of volume averaging effect for air-filled cylindrical ionization chambers to determine correction factors in small photon field for the given chamber. As a method, we measured output factors using several cylindrical ionization chambers and calculated with mathematical method similar to deconvolution in which we modeled non-constant and inhomogeneous exposure function in the cavity of chamber. The parameters in exposure function and correction factors were determined by solving a system of equations we developed with measurement data and geometry of the given chamber. Correction factors (CFs) we had found are very similar to that from Monte Carlo (MC) simulation. For example, CFs in this study were computed as 1.116 for PTW31010, and 1.0225 for PTW31016, while CFs from MC were reported as approximately between 1.17 and 1.20 for PTW31010, and between 1.02 and 1.06 for PTW31016 in of 6MV photon beam . Furthermore, the result from the method of deconvolution combined with MC for cham...

  5. Construction of a scattering chamber for ion-beam analysis of environmental materials in undergraduate physics research

    SciTech Connect (OSTI)

    LaBrake, Scott M.; Vineyard, Michael F.; Turley, Colin F.; Moore, Robert D.; Johnson, Christopher [Department of Physics and Astronomy Union College, Schenectady, NY 12308 (United States)

    2013-04-19

    We have developed a new scattering chamber for ion-beam analysis of environmental materials with the 1.1-MV Pelletron accelerator at the Union College Ion-Beam Analysis Laboratory. The chamber was constructed from a ten-inch, Conflat, multi-port cross and includes a three-axis target manipulator and target ladder assembly, an eight-inch turbo pump, an Amptek X-ray detector, and multiple charged particle detectors. Recent projects performed by our undergraduate research team include proton induced X-ray emission (PIXE) and Rutherford backscattering (RBS) analyses of atmospheric aerosols collected with a nine-stage cascade impactor in Upstate New York. We will describe the construction of the chamber and discuss the results of some commissioning experiments.

  6. Specification for a real-time computer for use with the CERN 2 metre-liquid Hydrogen Bubble Chamber and associated particle beam

    E-Print Network [OSTI]

    CERN. Geneva. TC-200

    1966-01-01

    Specification for a real-time computer for use with the CERN 2 metre-liquid Hydrogen Bubble Chamber and associated particle beam

  7. Arrangements for the Building and Use of a 150 cm Cloud Chamber in Co-operation Between CERN and the Swiss Federal Institute of Technology, Zurich (ETH)

    E-Print Network [OSTI]

    1960-01-01

    Arrangements for the Building and Use of a 150 cm Cloud Chamber in Co-operation Between CERN and the Swiss Federal Institute of Technology, Zurich (ETH)

  8. Contract for Reinforced Concrete and Masonry Work on the Canteen and the Connecting Wing, and for the Completion of the Council Chamber in the Main Building

    E-Print Network [OSTI]

    1958-01-01

    Contract for Reinforced Concrete and Masonry Work on the Canteen and the Connecting Wing, and for the Completion of the Council Chamber in the Main Building

  9. Arrangements for the Building and Use of a 150 cm Cloud Chamber in Co-operation between CERN and the Swiss Federal Institute of Technology, Zurich (ETH)

    E-Print Network [OSTI]

    European Organization for Nuclear Research

    1960-01-01

    Arrangements for the Building and Use of a 150 cm Cloud Chamber in Co-operation between CERN and the Swiss Federal Institute of Technology, Zurich (ETH)

  10. Langmuir probe studies and ion energy distributions in pure argon, argon + 10% oxygen and pure hydrogen discharges used for cleaning stainless steel ultrahigh vacuum chambers

    E-Print Network [OSTI]

    Mathewson, A G; Hazeltine, S; Lee-Li, K; Foakes, A P; Störi, H

    1980-01-01

    Langmuir probe studies and ion energy distributions in pure argon, argon + 10% oxygen and pure hydrogen discharges used for cleaning stainless steel ultrahigh vacuum chambers

  11. Usiing NovoCOS cleaning equipment in repairing the furnace-chamber lining in coke batteries 4 & 5 at OAO Koks

    SciTech Connect (OSTI)

    S.G. Protasov; R. Linden; A. Gross [OAO Koks, Kemerovo (Russian Federation)

    2009-05-15

    Experience with a new surface-preparation technology for the ceramic resurfacing of the refractory furnace-chamber lining in coke batteries is described.

  12. Investigation of light emission from a parallel-plate avalanche chamber filled with noble gases and with TEA, TMAE, and $H_{2}O$ vapours at atmospheric pressure

    E-Print Network [OSTI]

    Peskov, Vladimir; Dominik, Wojciech; Sauli, Fabio

    1989-01-01

    Investigation of light emission from a parallel-plate avalanche chamber filled with noble gases and with TEA, TMAE, and $H_{2}O$ vapours at atmospheric pressure

  13. Cryogenic argon ionization chamber detector for analysis of radioactive noble gases. Master's thesis

    SciTech Connect (OSTI)

    Berggren, S.R.

    1982-03-01

    Two ionization chamber detectors, using liquid or solid argon as their medium were designed, constructed and tested as an improved means of analyzing quantitatively xenon 131m and xenon 133. Problems with the first detector, including vibrational noise and inadequate temperature control, limited its use to studies using solid argon. In the second design, many operating problems of the first detector were corrected. Properties of the detectors were studied using external gamma sources and xenon 131m dispersed inside the detector medium. The xenon sample and argon were purified and cryogenically pumped into the detector for spectral analysis. Both the purity of the argon and bias voltages affected resolution by changing the trapping distance of the electrons in the medium. Lower temperatures increased detection efficiency by condensing more of the sample into the cell. No clearly recognizable energy peak could be found in spectra from external or internal sources.

  14. Focusing, in-chamber spectrometer triplet for high resolution measurements on the Sandia Z facility

    SciTech Connect (OSTI)

    Wenger, D. F.; Sinars, D. B.; Rochau, G. A.; Bailey, J. E.; Porter, J. L.; Faenov, A. Ya.; Pikuz, T. A.; Pikuz, S. A.

    2006-10-15

    An early prototype of a focusing spectrometer with one-dimensional (1D) spatial resolution (FSSR) instrument was previously developed for use in the vacuum chamber of the Sandia Z facility [Sinars et al., J. Quant. Spectrosc. Radiat. Transf. 99, 595 (2006)]. This instrument used a single, spherically bent crystal to measure time-integrated Ar spectra from 0.295-0.378 nm with {lambda}/{delta}{lambda}>2000 and a 1D axial spatial resolution of {approx}50 {mu}m. We present the design of a final version of this instrument that improves the shielding, can be aligned more accurately, and uses three crystals instead of one. The last change enables coverage of multiple spectral ranges if different crystals are used, or multiple times if identical crystals and time-gated detectors are used. We also present results from initial prototyping tests on the Z facility using two crystals in a time-integrated mode.

  15. A microwave applicator for uniform irradiation by circularly polarized waves in an anechoic chamber

    SciTech Connect (OSTI)

    Chiang, W. Y.; Wu, M. H.; Wu, K. L.; Lin, M. H.; Teng, H. H.; Barnett, L. R.; Chu, K. R., E-mail: krchu@yahoo.com.tw [Department of Physics, National Taiwan University, Taipei, Taiwan (China); Tsai, Y. F.; Ko, C. C.; Yang, E. C. [Department of Entomology, National Taiwan University, Taipei, Taiwan (China); Jiang, J. A. [Department of Bio-Industrial Mechatronics Engineering, National Taiwan University, Taipei, Taiwan (China)

    2014-08-15

    Microwave applicators are widely employed for materials heating in scientific research and industrial applications, such as food processing, wood drying, ceramic sintering, chemical synthesis, waste treatment, and insect control. For the majority of microwave applicators, materials are heated in the standing waves of a resonant cavity, which can be highly efficient in energy consumption, but often lacks the field uniformity and controllability required for a scientific study. Here, we report a microwave applicator for rapid heating of small samples by highly uniform irradiation. It features an anechoic chamber, a 24-GHz microwave source, and a linear-to-circular polarization converter. With a rather low energy efficiency, such an applicator functions mainly as a research tool. This paper discusses the significance of its special features and describes the structure, in situ diagnostic tools, calculated and measured field patterns, and a preliminary heating test of the overall system.

  16. Microbial Community Analysis of a Single Chamber Microbial Fuel Cell Using Potato Wastewater

    SciTech Connect (OSTI)

    Zhen Li; Rishika Haynes; Eugene Sato; Malcolm Shields; Yoshiko Fujita; Chikashi Sato

    2014-04-01

    Microbial fuel cells (MFCs) convert chemical energy to electrical energy via bioelectrochemical reactions mediated by microorganisms. We investigated the diversity of the microbial community in an air cathode single chamber MFC that utilized potato-process wastewater as substrate. Terminal Restriction Fragment Length Polymorphism (T-RFLP) results indicated that the bacterial communities on the anode, cathode, control electrode, and MFC bulk fluid were similar, but differed dramatically from that of the anaerobic domestic sludge and potato wastewater inoculum. The 16S rDNA sequencing results showed that microbial species detected on the anode were predominantly within the phyla of Proteobacteria, Firmicutes, and Bacteroidetes. Fluorescent microscopy results indicated that there was a clear enhancement of biofilm formation on the anode. Results of this study could help improve understanding of the complexity of microbial communities and optimize the microbial composition for generating electricity by MFCs that utilize potato wastewater.

  17. Environmental chamber measurements of mercury flux from coal utilization by-products

    SciTech Connect (OSTI)

    Pekney, Natalie J.; Martello, Donald; Schroeder, Karl; Granite, Evan

    2009-05-01

    An environmental chamber was constructed to measure the mercury flux from coal utilization by-product (CUB) samples. Samples of fly ash, FGD gypsum, and wallboard made from FGD gypsum were tested under both dark and illuminated conditions with or without the addition of water to the sample. Mercury releases varied widely, with 7- day experiment averages ranging from -6.8 to 73 ng/m(2) h for the fly ash samples and -5.2 to 335 ng/m(2) h for the FGD/wallboard samples. Initial mercury content, fly ash type, and light exposure had no observable consistent effects on the mercury flux. For the fly ash samples, the effect of a mercury control technology was to decrease the emission. For three of the four pairs of FGD gypsum and wallboard samples, the wallboard sample released less (or absorbed more) mercury than the gypsum.

  18. Environmental chamber measurements of mercury flux from coal utilization by-products

    SciTech Connect (OSTI)

    Pekney, N.J.; Martello, D.V.; Schroeder, K.T.; Granite, E.J.

    2009-05-01

    An environmental chamber was constructed to measure the mercury flux from coal utilization by-product (CUB) samples. Samples of fly ash, FGD gypsum, and wallboard made from FGD gypsum were tested under both dark and illuminated conditions with or without the addition of water to the sample. Mercury releases varied widely, with 7-day experiment averages ranging from -6.8 to 73 ng/m2 h for the fly ash samples and -5.2 to 335 ng/m2 h for the FGD/wallboard samples. Initial mercury content, fly ash type, and light exposure had no observable consistent effects on the mercury flux. For the fly ash samples, the effect of a mercury control technology was to decrease the emission. For three of the four pairs of FGD gypsum and wallboard samples, the wallboard sample released less (or absorbed more) mercury than the gypsum.

  19. Liquid Argon Time Projection Chamber Research and Development in the United States

    E-Print Network [OSTI]

    B. Baller; C. Bromberg; N. Buchanan; F. Cavanna; H. Chen; E. Church; V. Gehman; H. Greenlee; E. Guardincerri; B. Jones; T. Junk; T. Katori; M. Kirby; K. Lang; B. Loer; A. Marchionni; T. Maruyama; C. Mauger; A. Menegolli; D. Montanari; S. Mufson; B. Norris; S. Pordes; J. Raaf; B. Rebel; R. Sanders; M. Soderberg; J. St. John; T. Strauss; A. Szelc; C. Touramanis; C. Thorn; J. Urheim; R. Van de Water; H. Wang; B. Yu; M. Zuckerbrot

    2014-03-09

    A workshop was held at Fermilab on March 20-21, 2013 to discuss the development of liquid argon time projection chambers (LArTPC) in the United States. The workshop was organized under the auspices of the Coordinating Panel for Advanced Detectors, a body that was initiated by the American Physical Society Division of Particles and Fields. All presentations at the workshop were made in plenary sessions organized into seven topical categories: $i)$ Argon Purity, $ii)$ Cryogenics, $iii)$ TPC and High Voltage, $iv)$ Electronics, Data Acquisition and Triggering, $v)$ Scintillation Light Detection, $vi)$ Calibration and Test Beams, and $vii)$ Software. This document summarizes the current efforts in each of these topical categories. It also highlights areas in LArTPC research and development that are common between neutrino experiments and dark matter experiments.

  20. Silicon nitride swirl lower-chamber for high power turbocharged diesel engines

    SciTech Connect (OSTI)

    Kamiya, S.; Murachi, M.; Kawamoto, H.; Kato, S.; Kawakami, S.; Suzuki, Y.

    1985-01-01

    This paper describes application of sintered silicon nitride to the swirl lower-chamber in order to improve performance of turbocharged diesel engines. Various stress analyses by finite element method and stress measurements have been applied to determine the design specifications for the component, which compromise brittleness of ceramic materials. Material development was conducted to evaluate strength, fracture toughness, and thermal properties for the sintered bodies. Ceramic injection molding has been employed to fabricate components with large quantities. In the present work. Quality assurance for the components can be made by reliability evaluation methods as well as non-destructive and stress loading inspections. It is found that the engine performance with ceramic component has been increased in the power out put of 9ps as compared to that of conventional engines.

  1. 2014 National Small Business Contracting Summit- US Women’s Chamber of Commerce & National Association of Small Business Contractors

    Broader source: Energy.gov [DOE]

    The National Association of Small Business Contractors and the U.S. Women's Chamber of Commerce present the 2014 National Small Business Federal Contracting Summit. The event will include sessions on securing a fair share of federal contracting, legal issues, trends and opportunities.

  2. Methane efflux from boreal wetlands: Theory and testing of the ecosystem model Ecosys with chamber and tower flux measurements

    E-Print Network [OSTI]

    Roulet, Nigel T.

    Methane efflux from boreal wetlands: Theory and testing of the ecosystem model Ecosys with chamber and Structure: Biosphere/atmosphere interactions; 1890 Hydrology: Wetlands; KEYWORDS: Ecosys, methane emissions, wetlands, modeling Citation: Grant, R. F., and N. T. Roulet, Methane efflux from boreal wetlands: Theory

  3. Probabilistic Analysis of a Monod-type equation by use of a single chamber Microbial Fuel Cell

    E-Print Network [OSTI]

    for our society. Microbial fuel cells (MFCs) represent a new form of renewable energy by convertingProbabilistic Analysis of a Monod-type equation by use of a single chamber Microbial Fuel Cell Eric A. Zielke December 9, 2005 #12;Abstract Renewable energy forms have become an increasing need

  4. ARIES Inertial Fusion Chamber Assessment M. S. Tillack*, F. Najmabadi, L. A. El-Guebaly, D. Goodin, W. R. Meier,

    E-Print Network [OSTI]

    commissioned two large, multi-institutional IFE power plant design studies: Prometheus [1] and OSIRIS/ER-54101) March 1992. [2] W. R. MEIER, et al., "OSIRIS and SOMBRERO Inertial Fusion Power Plant Designs components (i.e., final optics, final focus magnets), chamber physics (particle and radiation transport, gas

  5. Volcano-tectonic modelling of magma chambers, ring-faults, unrest, and eruptions in the Tianchi Volcano, China

    E-Print Network [OSTI]

    Sheldon, Nathan D.

    this range to AD938-946), produced between 96 and 172 km3 of deposits, or around 30 km3 of dense magma, and is one of the largest eruptions on Earth during the past 1100 years. A 5-km-diameter collapse caldera, indicating that the shallow magma chamber and/or an associated geothermal system beneath the volcano

  6. A Concept for a Low Pressure Noble Gas Fill Intervention in the IFE Fusion Test Facility (FTF) Target Chamber

    SciTech Connect (OSTI)

    Gentile, C. A.; Blanchard, W. R.; Kozub, T. A.; Aristova, M.; McGahan, C.; Natta, S.; Pagdon, K.; Zelenty, J.

    2010-01-14

    An engineering evaluation has been initiated to investigate conceptual engineering methods for implementing a viable gas shield strategy in the Fusion Test Facility (FTF) target chamber. The employment of a low pressure noble gas in the target chamber to thermalize energetic helium ions prior to interaction with the wall could dramatically increase the useful life of the first wall in the FTF reactor1. For the purpose of providing flexibility, two target chamber configurations are addressed: a five meter radius sphere and a ten meter radius sphere. Experimental studies at Nike have indicated that a low pressure, ambient gas resident in the target chamber during laser pulsing does not appear to impair the ability of laser light from illuminating targets2. In addition, current investigations into delivering, maintaining, and processing low pressure gas appear to be viable with slight modification to current pumping and plasma exhaust processing technologies3,4. Employment of a gas fill solution for protecting the dry wall target chamber in the FTF may reduce, or possibly eliminate the need for other attenuating technologies designed for keeping He ions from implanting in first wall structures and components. The gas fill concept appears to provide an effective means of extending the life of the first wall while employing mostly commercial off the shelf (COTS) technologies. Although a gas fill configuration may provide a methodology for attenuating damage inflicted on chamber surfaces, issues associated with target injection need to be further analyzed to ensure that the gas fill concept is viable in the integrated FTF design5. In the proposed system, the ambient noble gas is heated via the energetic helium ions produced by target detonation. The gas is subsequently cooled by the chamber wall to approximately 800oC, removed from the chamber, and processed by the chamber gas processing system (CGPS). In an optimized scenario of the above stated concept, the chamber wall acts as the primary heat exchanger. During removal, gas is pumped through the laser ports by turbo molecular-drag pumps (TM-DP). For the purpose of reducing organic based lubricants and seals, a magnetically levitated TM-DP is being investigated with pump manufacturers. Currently, magnetically levitated turbo molecular pumps are commercially available. The pumps will be exposed to thermal loads and ionizing radiation (tritium, Ar-41, post detonation neutrons). Although the TM-DP's will be subjected to these various radiations, current designs for similar pumping devices have been hardened and have the ability of locating control electronics in remote radiation shielded enclosures4. The radiation hardened TM-DP's will be 5 required to operate with minimal maintenance for periods of up to 18 continuous months. As part of this initial investigation for developing a conceptual engineering strategy for a gas fill solution, commercial suppliers of low pressure gas pumping systems have been contacted and engaged in this evaluation. Current technology in the area of mechanical pumping systems indicates that the development of a robust pumping system to meet the requirements of the FTF gas fill concept is within the limits of COTS equipment3,4.

  7. MAIN CHAMBER NEUTRAL PRESSURE IN ALCATOR C-MOD AND JET C S Pitcher, S K Erents*, W Fundamenski*, B LaBombard, B Lipschultz, G F Matthews*,

    E-Print Network [OSTI]

    Pitcher, C. S.

    MAIN CHAMBER NEUTRAL PRESSURE IN ALCATOR C-MOD AND JET C S Pitcher, S K Erents*, W Fundamenski*, B *Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon, Oxon OX14 3DB,UK 1 Introduction Main chamber gas in a divertor tokamak arises due to recombination of plasma ions either directly in the main

  8. Nickel based anodes for single chamber solid oxide fuel cells : a catalytic study Geoffroy Gadacz, Sorina Udroiu, Jean-Paul Viricelle, Christophe Pijolat, Michle Pijolat

    E-Print Network [OSTI]

    Boyer, Edmond

    Nickel based anodes for single chamber solid oxide fuel cells : a catalytic study Geoffroy Gadacz Single chamber solid oxide fuel cells (SCFC) are an alternative concept to traditional SOFC's. Conventional anodes, which consist of a cermet of metallic Ni and ionic conductor, have to work under a mixture

  9. Modeling of the saturation current of a fission chamber taking into account the distorsion of electric field due to space charge effects

    E-Print Network [OSTI]

    Olivier Poujade; Alain Lebrun

    2002-02-08

    Fission chambers were first made fifty years ago for neutron detection. At the moment, the French Atomic Energy Commission \\textsf{(CEA-Cadarache)} is developing a sub-miniature fission chamber technology with a diameter of 1.5 mm working in the current mode (Bign). To be able to measure intense fluxes, it is necessary to adjust the chamber geometry and the gas pressure before testing it under real neutron flux. In the present paper, we describe a theoretical method to foresee the current-voltage characteristics (sensitivity and saturation plateau) of a fission chamber whose geometrical features are given, taking into account the neutron flux to be measured (spectrum and intensity). The proposed theoretical model describes electric field distortion resulting from charge collection effect. A computer code has been developed on this model basis. Its application to 3 kinds of fission chambers indicates excellent agreement between theoretical model and measured characteristics.

  10. Ageing studies on small Thin Gap Chambers for the ATLAS New Small Wheel

    E-Print Network [OSTI]

    Gignac, Matthew; The ATLAS collaboration

    2015-01-01

    The instantaneous luminosity of the Large Hadron Collider at CERN will be increased up to a factor of five with respect to the design value by undergoing an extensive upgrade program over the coming decade. The largest upgrade project for the ATLAS Muon System is the replacement of the present first station in the forward regions with the so-called New Small Wheels (NSWs), to be installed during the LHC long shutdown in 2018/19. Small-Strip Thin Gap Chambers (sTGC) detectors are one chosen technology to provide fast trigger and high precision muon tracking under the high luminosity LHC conditions. We study ageing effects of sTGC detectors with a gas mixture of 55% of CO2 and 45% of n-pentane. A sTGC detector was irradiated with beta-rays from a Sr-90 source. Three different gas flow rates were tested. We observed no deterioration on pulse height of the sTGC up to an accumulated charge of 6.7 C/cm.

  11. The design and performance of a prototype water Cherenkov optical time-projection chamber

    E-Print Network [OSTI]

    Oberla, E

    2015-01-01

    A first experimental test of tracking relativistic charged particles by `drifting' Cherenkov photons in a water-based optical time-projection chamber (OTPC) has been performed at the Fermilab Test Beam Facility. The prototype OTPC detector consists of a 77~cm long, 28~cm diameter, 40~kg cylindrical water mass instrumented with a combination of commercial $5.1\\times5.1$~cm$^2$ micro-channel plate photo-multipliers (MCP-PMT) and $6.7\\times6.7$~cm$^2$ mirrors. Five MCP-PMTs are installed in two columns along the OTPC cylinder in a small-angle stereo configuration. A mirror is mounted opposite each MCP-PMT on the far side of the detector cylinder, effectively doubling the photo-detection efficiency and providing a time-resolved image of the Cherenkov light on the opposing wall. Each MCP-PMT is coupled to an anode readout consisting of thirty 50 Ohm microstrips. A 180-channel data acquisition system digitizes the MCP-PMT signals on one end of the microstrips using the PSEC4 waveform sampling-and-digitizing chip op...

  12. A steerable UV laser system for the calibration of liquid argon time projection chambers

    E-Print Network [OSTI]

    A. Ereditato; I. Kreslo; M. Lüthi; C. Rudolf von Rohr; M. Schenk; T. Strauss; M. Weber; M. Zeller

    2014-10-04

    A number of liquid argon time projection chambers (LAr TPC's) are being build or are proposed for neutrino experiments on long- and short baseline beams. For these detectors a distortion in the drift field due to geometrical or physics reasons can affect the reconstruction of the events. Depending on the TPC geometry and electric drift field intensity this distortion could be of the same magnitude as the drift field itself. Recently, we presented a method to calibrate the drift field and correct for these possible distortions. While straight cosmic ray muon tracks could be used for calibration, multiple coulomb scattering and momentum uncertainties allow only a limited resolution. A UV laser instead can create straight ionization tracks in liquid argon, and allows one to map the drift field along different paths in the TPC inner volume. Here we present a UV laser feed-through design with a steerable UV mirror immersed in liquid argon that can point the laser beam at many locations through the TPC. The straight ionization paths are sensitive to drift field distortions, a fit of these distortion to the linear optical path allows to extract the drift field, by using these laser tracks along the whole TPC volume one can obtain a 3D drift field map. The UV laser feed-through assembly is a prototype of the system that will be used for the MicroBooNE experiment at the Fermi National Accelerator Laboratory (FNAL).

  13. Performance of a Drift Chamber Candidate for a Cosmic Muon Tomography System

    SciTech Connect (OSTI)

    Anghel, V.; Jewett, C.; Jonkmans, G.; Thompson, M.; Armitage, J.; Botte, J.; Boudjemline, K.; Erlandson, A.; Oakham, G.; Bueno, J.; Bryman, D.; Liu, Z.; Charles, E.; Gallant, G.; Cousins, T.; Noel, S.; Drouin, P.-L.; Waller, D.; Stocki, T. J.

    2011-12-13

    In the last decade, many groups around the world have been exploring different ways to probe transport containers which may contain illicit Special Nuclear Materials such as uranium. The muon tomography technique has been proposed as a cost effective system with an acceptable accuracy. A group of Canadian institutions (see above), funded by Defence Research and Development Canada, is testing different technologies to track the cosmic muons. One candidate is the single wire Drift Chamber. With the capability of a 2D impact position measurement, two detectors will be placed above and two below the object to be probed. In order to achieve a good 3D image quality of the cargo content, a good angular resolution is required. The simulation showed that 1mrad was required implying the spatial resolution of the trackers must be in the range of 1 to 2 mm for 1 m separation. A tracking system using three prototypes has been built and tested. The spatial resolution obtained is 1.7 mm perpendicular to the wire and 3 mm along the wire.

  14. Monte Carlo study of the depth-dependent fluence perturbation in parallel-plate ionization chambers in electron beams

    SciTech Connect (OSTI)

    Zink, K.; Czarnecki, D.; Voigts-Rhetz, P. von; Looe, H. K.; Harder, D.

    2014-11-01

    Purpose: The electron fluence inside a parallel-plate ionization chamber positioned in a water phantom and exposed to a clinical electron beam deviates from the unperturbed fluence in water in absence of the chamber. One reason for the fluence perturbation is the well-known “inscattering effect,” whose physical cause is the lack of electron scattering in the gas-filled cavity. Correction factors determined to correct for this effect have long been recommended. However, more recent Monte Carlo calculations have led to some doubt about the range of validity of these corrections. Therefore, the aim of the present study is to reanalyze the development of the fluence perturbation with depth and to review the function of the guard rings. Methods: Spatially resolved Monte Carlo simulations of the dose profiles within gas-filled cavities with various radii in clinical electron beams have been performed in order to determine the radial variation of the fluence perturbation in a coin-shaped cavity, to study the influences of the radius of the collecting electrode and of the width of the guard ring upon the indicated value of the ionization chamber formed by the cavity, and to investigate the development of the perturbation as a function of the depth in an electron-irradiated phantom. The simulations were performed for a primary electron energy of 6 MeV. Results: The Monte Carlo simulations clearly demonstrated a surprisingly large in- and outward electron transport across the lateral cavity boundary. This results in a strong influence of the depth-dependent development of the electron field in the surrounding medium upon the chamber reading. In the buildup region of the depth-dose curve, the in–out balance of the electron fluence is positive and shows the well-known dose oscillation near the cavity/water boundary. At the depth of the dose maximum the in–out balance is equilibrated, and in the falling part of the depth-dose curve it is negative, as shown here the first time. The influences of both the collecting electrode radius and the width of the guard ring are reflecting the deep radial penetration of the electron transport processes into the gas-filled cavities and the need for appropriate corrections of the chamber reading. New values for these corrections have been established in two forms, one converting the indicated value into the absorbed dose to water in the front plane of the chamber, the other converting it into the absorbed dose to water at the depth of the effective point of measurement of the chamber. In the Appendix, the in–out imbalance of electron transport across the lateral cavity boundary is demonstrated in the approximation of classical small-angle multiple scattering theory. Conclusions: The in–out electron transport imbalance at the lateral boundaries of parallel-plate chambers in electron beams has been studied with Monte Carlo simulation over a range of depth in water, and new correction factors, covering all depths and implementing the effective point of measurement concept, have been developed.

  15. A Measurement of the holographic minimum observable beam branching ratio in the Fermilab 15-foot bubble chamber

    SciTech Connect (OSTI)

    Aderholz, M.; Aggarwal, M.M.; Akbari, H.; Allport, P.P.; Badyal, S.K.; Ballagh, H.C.; Barth, M.; Baton, J.P.; Bingham, H.H.; Bjelkhagen, H.; Brucker, E.B.; Burnstein,; Campbell, J.R.; Cence, R.J.; Chatterjee, T.K.; Clayton, E.F.; Corrigan, G.; Coutures, C.; DeProspo, D.; Devanand,; De Wolf, E.A.; /UC, Berkeley /Birmingham U. /Brussels U.,

    1997-01-01

    Holography has been used successfully in combination with conventional optics for the first time in a large cryogenic bubble chamber, the 15-Foot Bubble Chamber at Fermilab, during a physics run. The innovative system combined the reference beam with the object beam, illuminating a conical volume of {approx} 1.4 m{sup 3}. Bubble tracks from neutrino interactions with a width of {approx} 120 {micro}m have been recorded with good contrast. The ratio of intensities of the object light to the reference light striking the film is called the Beam Branching Ratio. We obtained in our experiment an exceedingly small minimum-observable ratio of (0.54 {+-} 0.21) x 10{sup -7}. The technology has the potential for a wide range of applications.

  16. A Multi-Chamber System for Analyzing the Outgassing, Deposition, and Associated Optical Degradation Properties of Materials in a Vacuum

    E-Print Network [OSTI]

    Singal, J; Chang, C; Czodrowski, P; Kim, P

    2009-01-01

    We report on the Camera Materials Test Chamber, a multi-vessel apparatus which analyzes the outgassing consequences of candidate materials for use in the vacuum cryostat of a new telescope camera. The system measures the outgassing products and rates of samples of materials at different temperatures, and collects films of outgassing products to measure the effects on light transmission in six optical bands. The design of the apparatus minimizes potential measurement errors introduced by background contamination.

  17. EDDY CURRENT EFFECT OF THE BNL-AGS VACUUM CHAMBER ON THE OPTICS OF THE BNL-AGS SYNCHROTRON.

    SciTech Connect (OSTI)

    TSOUPAS,N.; AHRENS,L.; BROWN,K.A.; GLENN,J.W.; GARDNER,K.

    1999-03-29

    During the acceleration cycle of the AGS synchrotron, eddy currents are generated within the walls of the vacuum chambers of the AGS main magnets. The vacuum chambers have elliptical cross section, are made of inconel material with a wall thickness of 2 mm and are placed within the gap of the combined-function main magnets of the AGS synchrotron. The generation of the eddy currents in the walls of the vacuum chambers, creates various magnetic multipoles, which affect the optics of the AGS machine. In this report these magnetic multipoles are calculated for various time interval starting at the acceleration cycle, where the magnetic field of the main magnet is {approx}0.1 T, and ending before the beam extraction process, where the magnetic field of the main magnet is almost constant at {approx}1.1 T. The calculations show that the magnetic multipoles generated by the eddy-currents affect the optics of the AGS synchrotron during the acceleration cycle and in particular at low magnetic fields of the main magnet. Their effect is too weak to affect the optics of the AGS machine during beam extraction at the nominal energies.

  18. Reactor Chamber and Balance-of-Plant Characteristics for a Fast-Ignition Heavy-Ion Fusion Power Plant

    SciTech Connect (OSTI)

    Medin, Stanislav; Churazov, Mikhail; Koshkarev, Dmitri; Sharkov, Boris; Orlov, Yurii; Suslin, Viktor; Zemskov, Eugeni

    2003-05-15

    The concept of a fast-ignition heavy-ion fusion (FIHIF) power plant involves a cylindrical target and superhigh energy ion beams. The driver produces one plus/minus charge state multimass platinum ions with energy of 100 GeV. The driver efficiency and the target gain are taken as 0.25 and 100, respectively. The preliminary data on the energy fluxes delivered to the reactor chamber wall by the 500-MJ fusion yield are presented. The reactor chamber designed has two sections. In the first section, the microexplosions occur, and in the second section of bigger volume the expansion and condensation of vapors take place. The response of the blanket and the thin liquid film at the first-wall surface is evaluated. Lithium-lead eutectic is taken as a coolant. The evaporated mass and the condensation time are estimated, taking into account major thermophysical effects. The estimated neutron spectrum from the FIHIF target gives an average neutron energy of 11.9 MeV. The mechanical stresses in the construction material due to neutron energy release are evaluated. The outlet coolant chamber temperature is taken as 550 deg. C. The heat conversion system consisting of three coolant loops provides a net efficiency of the FIHIF power plant of 0.37.

  19. Rab11 Is Required for Epithelial Cell Viability, Terminal Differentiation, and Suppression of Tumor-Like Growth in the Drosophila Egg Chamber

    E-Print Network [OSTI]

    Xu, Jiang; Lan, Lan; Bogard, Nicholas; Mattione, Cristin; Cohen, Robert S.

    2011-05-23

    Background: The Drosophila egg chamber provides an excellent system in which to study the specification and differentiation of epithelial cell fates because all of the steps, starting with the division of the corresponding stem cells, called...

  20. Enhancement of microarcing at a grounded chamber wall by nonvanishing ion sheath in a radio-frequency capacitive discharged plasma

    SciTech Connect (OSTI)

    Kwok, Dixon T.K.; Yin Yongbai; Bilek, Marcela M.M.; McKenzie, David

    2005-10-31

    One-dimensional hybrid particle-in-cell simulations in cylindrical r coordinate, with particle ions and Boltzmann's distribution of electrons, are used to investigate the arcing effect in radio-frequency (rf) capacitively coupled discharged plasma. The simulation shows that the arcing at the chamber wall is enhanced by the nonvanishing ion sheath at the surface, such that the emission electrons current will last for several tens of rf cycles. On the other hand, at the inner electrode, the electron emission occurs only during certain phases of the rf cycle and does not promote arc growth.

  1. Experimental verification of the method for detection of water microleakages in plasma vacuum chambers by using the hydroxyl spectrum

    SciTech Connect (OSTI)

    Antipenkov, A. B.; Afonin, O. N.; Ochkin, V. N.; Savinov, S. Yu.; Tskhai, S. N.

    2012-03-15

    Experimental determination of the sensitivity of the method for detection of water microleakages in the cooling systems of the plasma vacuum chambers of complex electrophysical devices (such as tokamaks, fuel elements of nuclear reactors, and plasmachemical reactors) is considered. It was shown that the spectroscopic method for detection of water microleakages by using the hydroxyl radiation spectrum makes it possible to detect leakages at a level of 10{sup -5} Pa m{sup 3} s{sup -1}. The spatial resolution of the method allows one to localize defects with an accuracy of several centimeters.

  2. 14/03/06 TTF2 Seminar: Re-design considerations for the vacuum chamber layout BC2 at the VUV-FEL Christopher Gerth Re-design considerations for vacuum

    E-Print Network [OSTI]

    14/03/06 TTF2 Seminar: Re-design considerations for the vacuum chamber layout BC2 at the VUV-FEL Christopher Gerth Re-design considerations for vacuum chamber layout of BC2 at the VUV-FEL Christopher Gerth #12;14/03/06 TTF2 Seminar: Re-design considerations for the vacuum chamber layout BC2 at the VUV-FEL

  3. Development and validation of compressible mixture viscous fluid algorithm applied to predict the evolution of inertial fusion energy chamber gas and the impact of gas on direct-drive target survival

    E-Print Network [OSTI]

    Martin, Robert Scott

    2011-01-01

    and technologies for fusion energy with lasers and direct-direct drive inertial fusion energy targets. Report 06-02,Improved Inertial Fusion Energy Chamber Inter-Shot

  4. Development and validation of compressible mixture viscous fluid algorithm applied to predict the evolution of inertial fusion energy chamber gas and the impact of gas on direct-drive target survival

    E-Print Network [OSTI]

    Martin, Robert Scott

    2011-01-01

    2010 “Prediction of Inertial Confinement Fusion Chamber GasBarodiffusion on the Inertial Confinement Fusion Database. [barodiffusion in inertial-confinement-fusion implosions:

  5. Summary of the Second Workshop on Liquid Argon Time Projection Chamber Research and Development in the United States

    E-Print Network [OSTI]

    Acciarri, R; Artrip, D; Baller, B; Bromberg, C; Cavanna, F; Carls, B; Chen, H; Deptuch, G; Epprecht, L; Dharmapalan, R; Foreman, W; Hahn, A; Johnson, M; Jones, B J P; Junk, T; Lang, K; Lockwitz, S; Marchionni, A; Mauger, C; Montanari, C; Mufson, S; Nessi, M; Back, H Olling; Petrillo, G; Pordes, S; Raaf, J; Rebel, B; Sinins, G; Soderberg, M; Spooner, N; Stancari, M; Strauss, T; Terao, K; Thorn, C; Tope, T; Toups, M; Urheim, J; Van de Water, R; Wang, H; Wasserman, R; Weber, M; Whittington, D; Yang, T

    2015-01-01

    The second workshop to discuss the development of liquid argon time projection chambers (LArTPCs) in the United States was held at Fermilab on July 8-9, 2014. The workshop was organized under the auspices of the Coordinating Panel for Advanced Detectors, a body that was initiated by the American Physical Society Division of Particles and Fields. All presentations at the workshop were made in six topical plenary sessions: $i)$ Argon Purity and Cryogenics, $ii)$ TPC and High Voltage, $iii)$ Electronics, Data Acquisition and Triggering, $iv)$ Scintillation Light Detection, $v)$ Calibration and Test Beams, and $vi)$ Software. This document summarizes the current efforts in each of these areas. It primarily focuses on the work in the US, but also highlights work done elsewhere in the world.

  6. Levitation and collection of diamond fine particles in the rf plasma chamber equipped with a hot filament

    SciTech Connect (OSTI)

    Shimizu, S.; Shimizu, T.; Thomas, H. M.; Morfill, G. E.; Jacob, W.

    2011-11-15

    We demonstrate the levitation of diamond fine particles in a H{sub 2} rf plasma chamber equipped with a hot filament and heated electrodes. The levitation conditions should be carefully chosen to compensate the strong thermophoretic forces caused by the filament and the electrodes. This levitation technique with the existence of a hot filament can be applied, e.g., for the efficient growth of diamond layers on seed particles injected and levitated in an rf plasma with reactive gases, e.g., CH{sub 4}/H{sub 2}. Additionally, the method for direct capture of levitated particles on a planar substrate was established, which is useful if it is necessary to analyze the particles after the levitation.

  7. Summary of the Second Workshop on Liquid Argon Time Projection Chamber Research and Development in the United States

    E-Print Network [OSTI]

    R. Acciarri; M. Adamowski; D. Artrip; B. Baller; C. Bromberg; F. Cavanna; B. Carls; H. Chen; G. Deptuch; L. Epprecht; R. Dharmapalan; W. Foreman; A. Hahn; M. Johnson; B. J. P. Jones; T. Junk; K. Lang; S. Lockwitz; A. Marchionni; C. Mauger; C. Montanari; S. Mufson; M. Nessi; H. Olling Back; G. Petrillo; S. Pordes; J. Raaf; B. Rebel; G. Sinins; M. Soderberg; N. Spooner; M. Stancari; T. Strauss; K. Terao; C. Thorn; T. Tope; M. Toups; J. Urheim; R. Van de Water; H. Wang; R. Wasserman; M. Weber; D. Whittington; T. Yang

    2015-04-23

    The second workshop to discuss the development of liquid argon time projection chambers (LArTPCs) in the United States was held at Fermilab on July 8-9, 2014. The workshop was organized under the auspices of the Coordinating Panel for Advanced Detectors, a body that was initiated by the American Physical Society Division of Particles and Fields. All presentations at the workshop were made in six topical plenary sessions: $i)$ Argon Purity and Cryogenics, $ii)$ TPC and High Voltage, $iii)$ Electronics, Data Acquisition and Triggering, $iv)$ Scintillation Light Detection, $v)$ Calibration and Test Beams, and $vi)$ Software. This document summarizes the current efforts in each of these areas. It primarily focuses on the work in the US, but also highlights work done elsewhere in the world.

  8. A study of the link between cosmic rays and clouds with a cloud chamber at the CERN PS

    E-Print Network [OSTI]

    The Cloud Collaboration

    2001-04-16

    Recent satellite data have revealed a surprising correlation between galactic cosmic ray (GCR) intensity and the fraction of the Earth covered by clouds. If this correlation were to be established by a causal mechanism, it could provide a crucial step in understanding the long-sought mechanism connecting solar and climate variability. The Earth's climate seems to be remarkably sensitive to solar activity, but variations of the Sun's electromagnetic radiation appear to be too small to account for the observed climate variability. However, since the GCR intensity is strongly modulated by the solar wind, a GCR-cloud link may provide a sufficient amplifying mechanism. Moreover if this connection were to be confirmed, it could have profound consequences for our understanding of the solar contributions to the current global warming. The CLOUD (Cosmics Leaving OUtdoor Droplets) project proposes to test experimentally the existence a link between cosmic rays and cloud formation, and to understand the microphysical mechanism. CLOUD plans to perform detailed laboratory measurements in a particle beam at CERN, where all the parameters can be precisely controlled and measured. The beam will pass through an expansion cloud chamber and a reactor chamber where the atmosphere is to be duplicated by moist air charged with selected aerosols and trace condensable vapours. An array of external detectors and mass spectrometers is used to analyse the physical and chemical characteristics of the aerosols and trace gases during beam exposure. Where beam effects are found, the experiment will seek to evaluate their significance in the atmosphere by incorporating them into aerosol and cloud models.

  9. Injury and yield responses of peanuts to chronic doses of ozone in open-top field chambers

    SciTech Connect (OSTI)

    Heagle, A.S.; Letchworth, M.B.; Mitchell, C.A.

    1983-01-01

    Peanuts were exposed during 1979 and 1980 to concentrations of ozone (O/sub 3/) that spanned those that occur in ambient air of peanut production areas in the United States. The different concentrations were obtained by adding O/sub 3/ to the air of open-top field chambers for 7 hr per day from the seedling stage to harvest. Ozone at seasonal 7-hr per day concentrations (mean concentration for 7 hr per day during the seasonal exposure period) equal to, or greater than, the ambient concentration caused foliar injury and decreased shoot and root weight for both years. Seasonal 7-hr per day O/sub 3/ concentrations in ambient air at the field site near Raleigh, NC, were 0.052 and 0.056 ppM for 1979 (131 days) and 1980 (112 days), respectively. In 1979, marketable pod weight (yield) per plant at seasonal 7-hr per day O/sub 3/ concentrations of 0.049, 0.072, and 0.096 ppM was 0, 30, and 37% less, respectively, than for control plants in chambers that received charcoal-filtered air with a seasonal concentration of 0.026 ppM O/sub 3/. In 1980, yield at seasonal O/sub 3/ concentrations of 0.056, 0.076, 0.100, and 0.125 ppM was 14, 35, 52, and 72% less, respectively, than for the control treatment (0.025 ppM). Linear regression equations using data from 1979 and 1980 predicted yield losses of 17 and 21%, respectively, at a seasonal 7-hr per day mean O/sub 3/ concentration of 0.054 ppM. 13 references, 4 figures, 2 tables.

  10. June7-8, 2001 A. R. Raffray, et al., Completion of Assessment of Dry Chamber Wall Option Without Protective Gas,

    E-Print Network [OSTI]

    Raffray, A. René

    June7-8, 2001 A. R. Raffray, et al., Completion of Assessment of Dry Chamber Wall Option Without ARIES Meeting UCSD June 7-8, 2001 #12;June7-8, 2001 A. R. Raffray, et al., Completion of Assessment for Direct-Drive and Indirect-Drive Targets #12;June7-8, 2001 A. R. Raffray, et al., Completion of Assessment

  11. Fig. 1. On the right is the Cloud Chamber, on the left is a laptop running the Cloud Catcher software ( Alexis Kirke.)

    E-Print Network [OSTI]

    Miranda, Eduardo Reck

    software (© Alexis Kirke.) CLOUD CHAMBER: A PERFORMANCE WITH REAL TIME TWO-WAY INTERACTION BETWEEN SUBATOMIC PARTICLES AND VIOLINIST Alexis Kirke, Eduardo Miranda, Antonino Chiaramonte, Anna R. Troisi, John.S.A. Martyn Bull, ISIS, Rutherford Appleton Laboratory, Harwell, Oxford, UK E-mail: alexis.kirke

  12. Dependence of loss rate of electrons due to elastic gas scattering on the shape of the vacuum chamber in an electron storage ring

    E-Print Network [OSTI]

    Kumar, Pradeep; Ghodke, A D; Singh, Pitamber

    2014-01-01

    The beam lifetime in an electron storage ring is also limited by the loss rate of the stored electrons due to the elastic coulomb scattering of electrons with the nuclei of residual gas atoms. The contribution to the beam lifetime due to this elastic scattering depends upon the shape factor which is governed by the shape of the vacuum chamber. In this paper, analytical expressions for the shape factor for a rectangular and an elliptical vacuum chamber as a function of longitudinal position along the circumference in a storage ring are derived using an approach in which the position of electrons at the focusing quadrupole is transformed to the location of defocusing quadrupole and vice versa to define the parts of the vacuum chamber, where the loss of electrons takes place at the location of quadrupoles. The expressions available in the literature are for the average shape factors. The expression of shape factor for a rectangular chamber derived in this paper are similar to the expression for average shape fac...

  13. Fabrication and characterization of anode-supported single chamber solid oxide fuel cell based on La0.6Sr0.4Co0.2Fe0.8O3--

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    -CGO cathode 1. Introduction Single-chamber solid oxide fuel cells (SC-SOFCs) have received many attentionsFabrication and characterization of anode-supported single chamber solid oxide fuel cell based-supported solid oxide fuel cells consisting of nickel-gadolinium doped ceria (NiO-CGO, 60:40 wt%) anode

  14. First Dark Matter Search Results from a 4-kg CF$_3$I Bubble Chamber Operated in a Deep Underground Site

    SciTech Connect (OSTI)

    Behnke, E.; Behnke, J.; Brice, S.J.; Broemmelsiek, D.; Collar, J.I.; Conner, A.; Cooper, P.S.; Crisler, M.; Dahl, C.E.; Fustin, D.; Grace, E.; /Indiana U., South Bend /Fermilab

    2012-04-01

    New data are reported from the operation of a 4.0 kg CF{sub 3}I bubble chamber in the 6800 foot deep SNOLAB underground laboratory. The effectiveness of ultrasound analysis in discriminating alpha decay background events from single nuclear recoils has been confirmed, with a lower bound of >99.3% rejection of alpha decay events. Twenty single nuclear recoil event candidates and three multiple bubble events were observed during a total exposure of 553 kg-days distributed over three different bubble nucleation thresholds. The effective exposure for single bubble recoil-like events was 437.4 kg-days. A neutron background internal to the apparatus, of known origin, is estimated to account for five single nuclear recoil events and is consistent with the observed rate of multiple bubble events. This observation provides world best direct detection constraints on WIMP-proton spin-dependent scattering for WIMP masses >20 GeV/c{sup 2} and demonstrates significant sensitivity for spin-independent interactions.

  15. First determination of an astrophysical cross section with a bubble chamber: the 15N(?,?)19F reaction

    E-Print Network [OSTI]

    C. Ugalde; B. DiGiovine; D. Henderson; R. J. Holt; K. E. Rehm; A. Sonnenschein; A. Robinson; R. Raut; G. Rusev; A. P. Tonchev

    2012-12-31

    We have devised a technique for measuring some of the most important nuclear reactions in stars which we expect to provide considerable improvement over previous experiments. Adapting ideas from dark matter search experiments with bubble chambers, we have found that a superheated liquid is sensitive to recoils produced from \\gamma-rays photodisintegrating the nuclei of the liquid. The main advantage of the new target-detector system is a gain in yield of six orders of magnitude over conventional gas targets due to the higher mass density of liquids. Also, the detector is practically insensitive to the \\gamma-ray beam itself, thus allowing it to detect only the products of the nuclear reaction of interest. The first set of tests of a superheated target with a narrow bandwidth \\gamma-ray beam was completed and the results demonstrate the feasibility of the scheme. The new data are successfully described by an R-matrix model using published resonance parameters. With the increase in luminosity of the next generation \\gamma-ray beam facilities, the measurement of thermonuclear rates in the stellar Gamow window would become possible.

  16. The experimental feature on the data of the primary proton identification in stratospheric X-ray emulsion chambers at energies >10 TeV (RUNJOB experiment)

    E-Print Network [OSTI]

    I. S. Zayarnaya

    2006-10-02

    The RUNJOB balloon-born emulsion chamber experiments have been carried out for investigating the composition and energy spectra of primary cosmic rays at energies 10-1000 TeV/nucleon. On the data of the treatment of RUNJOB` X-ray emulsion chambers exposed since 1995 to 1999 year about 50 % proton tracks were identified. In remained half of the events from proton group the one charged primary tracks were not found in the search area determined with high accuracy by the triangulation method using the several background heavy tracks. Considered methodical reasons in this paper could not explain this experimental result. The one from the probable physical reasons that is the neutrons in cosmic ray flux does not explain it too.

  17. A Multi-Chamber System for Analyzing the Outgassing, Deposition,and Associated Optical Degradation Properties of Materials in a Vacuum

    SciTech Connect (OSTI)

    Singal, Jack; Schindler, Rafe; Chang, Chihway; Czodrowski, Patrick; Kim, Peter; /KIPAC, Menlo Park /SLAC /Stanford U.

    2009-12-11

    We report on the Camera Materials Test Chamber, a multi-vessel apparatus which analyzes the outgassing consequences of candidate materials for use in the vacuum cryostat of a new telescope camera. The system measures the outgassing products and rates of samples of materials at different temperatures, and collects films of outgassing products to measure the effects on light transmission in six optical bands. The design of the apparatus minimizes potential measurement errors introduced by background contamination.

  18. Mimac-He3, a Project for a Micro-TPC Matrix of Chambers of Helium 3 for Axial Direct Detection of Non-Baryonic Dark Matter

    E-Print Network [OSTI]

    E. Moulin; D. Santos

    2005-05-21

    MIMAC-He3 (MIcro-tpc MAtrix of Chambers of Helium 3) is a project for direct detection of non-baryonic dark matter search using He3 as sensitive medium. The priviledged properties of He3 are highlighted. The double detection : ionization and track projection, is explained and rejection evaluated. A phenomenological study in effective SUSY models has been to investigate the MIMAC-He3 complementarity with respect to existing Dark Matter detectors.

  19. Liquid Hydrogen Bubble Chambers

    E-Print Network [OSTI]

    Alvarez, Luis W.

    1956-01-01

    t No. W - 7 4 0 5 -eng-48 ,LIQUID HYDROGEN EUSBLE CHA,MBEEZSand 3erkeley to iind if liquid hydrogen could be used as thethat supezheated 'liquid hydrogen could be made to boil

  20. Fusion Chamber Technology Publications

    E-Print Network [OSTI]

    California at Los Angeles, University of

    .A. "Modeling and Analysis of Time-Dependant Tritium Transport in Lithium Oxide", Journal of Nuclear Materials. 981-985, March (2001).. 16. E.T. Cheng, "Study of a Lead-Bismuth Cooled Fusion Blanket for Burning

  1. Avian inhalation exposure chamber

    DOE Patents [OSTI]

    Briant, J.K.; Driver, C.J.

    1992-05-05

    An exposure system is designed for delivering gaseous material ranging in particle size from 0.4 micrometers to 20.0 micrometers uniformly to the heads of experimental animals, primarily birds. The system includes a vertical outer cylinder and a central chimney with animal holding bottles connected to exposure ports on the vertical outer cylinder. 2 figs.

  2. Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds

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

    Nguyen, T. B.; Crounse, J. D.; Schwantes, R. H.; Teng, A. P.; Bates, K. H.; Zhang, X.; St. Clair, J. M.; Brune, W. H.; Tyndall, G. S.; Keutsch, F. N.; et al

    2014-12-19

    The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative atmospheric chamber campaign that occurred during January 2014. FIXCIT is the laboratory component of a synergistic field and laboratory effort aimed toward (1) better understanding the chemical details behind ambient observations relevant to the southeastern United States, (2) advancing the knowledge of atmospheric oxidation mechanisms of important biogenic hydrocarbons, and (3) characterizing the behavior of field instrumentation using authentic standards. Approximately 20 principal scientists from 14 academic and government institutions performed parallel measurements at a forested site in Alabama and at the atmospheric chambers at Caltech.more »During the 4 week campaign period, a series of chamber experiments was conducted to investigate the dark- and photo-induced oxidation of isoprene, ?-pinene, methacrolein, pinonaldehyde, acylperoxy nitrates, isoprene hydroxy nitrates (ISOPN), isoprene hydroxy hydroperoxides (ISOPOOH), and isoprene epoxydiols (IEPOX) in a highly controlled and atmospherically relevant manner. Pinonaldehyde and isomer-specific standards of ISOPN, ISOPOOH, and IEPOX were synthesized and contributed by campaign participants, which enabled explicit exploration into the oxidation mechanisms and instrument responses for these important atmospheric compounds. The present overview describes the goals, experimental design, instrumental techniques, and preliminary observations from the campaign. This work provides context for forthcoming publications affiliated with the FIXCIT campaign. Insights from FIXCIT are anticipated to aid significantly in interpretation of field data and the revision of mechanisms currently implemented in regional and global atmospheric models.« less

  3. Overview of the Focused Isoprene eXperiments at California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds

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

    Nguyen, T. B.; Crounse, J. D.; Schwantes, R. H.; Teng, A. P.; Bates, K. H.; Zhang, X.; St. Clair, J. M.; Brune, W. H.; Tyndall, G. S.; Keutsch, F. N.; et al

    2014-08-25

    The Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT) was a collaborative atmospheric chamber campaign that occurred during January 2014. FIXCIT was the laboratory component of a synergistic field and laboratory effort aimed toward (1) better understanding the chemical details behind ambient observations relevant to the Southeastern United States, (2) advancing the knowledge of atmospheric oxidation mechanisms of important biogenic hydrocarbons, and (3) characterizing the behavior of field instrumentation using authentic standards. Approximately 20 principal scientists from 14 academic and government institutions performed parallel measurements at a forested site in Alabama and at the atmospheric chambers at Caltech.more »During the four-week campaign period, a series of chamber experiments was conducted to investigate the dark- and photo-induced oxidation of isoprene, ?-pinene, methacrolein, pinonaldehyde, acylperoxy nitrates, isoprene hydroxy nitrates (ISOPN), isoprene hydroxy hydroperoxides (ISOPOOH), and isoprene epoxydiols (IEPOX) in a highly-controlled and atmospherically-relevant manner. Pinonaldehyde and isomer-specific standards of ISOPN, ISOPOOH, and IEPOX were synthesized and contributed by campaign participants, which enabled explicit exploration into the oxidation mechanisms and instrument responses for these important atmospheric compounds. The present overview describes the goals, experimental design, instrumental techniques, and preliminary observations from the campaign. Insights from FIXCIT are anticipated to significantly aid in interpretation of field data and the revision of mechanisms currently implemented in regional and global atmospheric models.« less

  4. Quantifying Contaminant Mass for the Feasibility Study of the DuPont Chambers Works FUSRAP Site - 13510

    SciTech Connect (OSTI)

    Young, Carl; Rahman, Mahmudur; Johnson, Ann; Owe, Stephan

    2013-07-01

    The U.S. Army Corps of Engineers (USACE) - Philadelphia District is conducting an environmental restoration at the DuPont Chambers Works in Deepwater, New Jersey under the Formerly Utilized Sites Remedial Action Program (FUSRAP). Discrete locations are contaminated with natural uranium, thorium-230 and radium-226. The USACE is proposing a preferred remedial alternative consisting of excavation and offsite disposal to address soil contamination followed by monitored natural attenuation to address residual groundwater contamination. Methods were developed to quantify the error associated with contaminant volume estimates and use mass balance calculations of the uranium plume to estimate the removal efficiency of the proposed alternative. During the remedial investigation, the USACE collected approximately 500 soil samples at various depths. As the first step of contaminant mass estimation, soil analytical data was segmented into several depth intervals. Second, using contouring software, analytical data for each depth interval was contoured to determine lateral extent of contamination. Six different contouring algorithms were used to generate alternative interpretations of the lateral extent of the soil contamination. Finally, geographical information system software was used to produce a three dimensional model in order to present both lateral and vertical extent of the soil contamination and to estimate the volume of impacted soil for each depth interval. The average soil volume from all six contouring methods was used to determine the estimated volume of impacted soil. This method also allowed an estimate of a standard deviation of the waste volume estimate. It was determined that the margin of error for the method was plus or minus 17% of the waste volume, which is within the acceptable construction contingency for cost estimation. USACE collected approximately 190 groundwater samples from 40 monitor wells. It is expected that excavation and disposal of contaminated soil will remove the contaminant source zone and significantly reduce contaminant concentrations in groundwater. To test this assumption, a mass balance evaluation was performed to estimate the amount of dissolved uranium that would remain in the groundwater after completion of soil excavation. As part of this evaluation, average groundwater concentrations for the pre-excavation and post-excavation aquifer plume area were calculated to determine the percentage of plume removed during excavation activities. In addition, the volume of the plume removed during excavation dewatering was estimated. The results of the evaluation show that approximately 98% of the aqueous uranium would be removed during the excavation phase. The USACE expects that residual levels of contamination will remain in groundwater after excavation of soil but at levels well suited for the selection of excavation combined with monitored natural attenuation as a preferred alternative. (authors)

  5. 52-Xy6T-23 1 Evaluation of a Neural Network-Based

    E-Print Network [OSTI]

    Obradovic, Zoran

    spatial coverage. The MODIS instrument observes reflected solar radiation through multiple spectral bands important properties of the atmosphere that indicates the amount of depletion that a beam of radiation undergoes as it passes through the atmosphere. To predict AOD, we used a data-driven approach based

  6. Lahontan RWQCB Order No. R6T-2011-0019 | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: EnergyKulpsville,LEDSGP/activitiesPlataLahendong GEPP Jump to:Lahontan RWQCB Order

  7. Comparison of secondary organic aerosol formed with an aerosol flow reactor and environmental reaction chambers: effect of oxidant concentration, exposure time and seed particles on chemical composition and yield

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

    Lambe, A. T.; Chhabra, P. S.; Onasch, T. B.; Brune, W. H.; Hunter, J. F.; Kroll, J. H.; Cummings, M. J.; Brogan, J. F.; Parmar, Y.; Worsnop, D. R.; et al

    2014-12-02

    We performed a systematic intercomparison study of the chemistry and yields of SOA generated from OH oxidation of a common set of gas-phase precursors in a Potential Aerosol Mass (PAM) continuous flow reactor and several environmental chambers. In the flow reactor, SOA precursors were oxidized using OH concentrations ranging from 2.0×108 to 2.2×1010 molec cm-3 over exposure times of 100 s. In the environmental chambers, precursors were oxidized using OH concentrations ranging from 2×106 to 2×107 molec cm-3 over exposure times of several hours. The OH concentration in the chamber experiments is close to that found in the atmosphere, butmore »the integrated OH exposure in the flow reactor can simulate atmospheric exposure times of multiple days compared to chamber exposure times of only a day or so. A linear correlation analysis of the mass spectra (m=0.91–0.92, r2=0.93–0.94) and carbon oxidation state (m=1.1, r2=0.58) of SOA produced in the flow reactor and environmental chambers for OH exposures of approximately 1011 molec cm-3 s suggests that the composition of SOA produced in the flow reactor and chambers is the same within experimental accuracy as measured with an aerosol mass spectrometer. This similarity in turn suggests that both in the flow reactor and in chambers, SOA chemical composition at low OH exposure is governed primarily by gas-phase OH oxidation of the precursors, rather than heterogeneous oxidation of the condensed particles. In general, SOA yields measured in the flow reactor are lower than measured in chambers for the range of equivalent OH exposures that can be measured in both the flow reactor and chambers. The influence of sulfate seed particles on isoprene SOA yield measurements was examined in the flow reactor. The studies show that seed particles increase the yield of SOA produced in flow reactors by a factor of 3 to 5 and may also account in part for higher SOA yields obtained in the chambers, where seed particles are routinely used.« less

  8. Conception and realization of a parallel-plate free-air ionization chamber for the absolute dosimetry of an ultrasoft X-ray beam

    SciTech Connect (OSTI)

    Groetz, J.-E., E-mail: jegroetz@univ-fcomte.fr; Mavon, C.; Fromm, M. [Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex (France); Ounoughi, N. [Laboratoire Chrono-Environnement, UMR CNRS 6249, Université de Franche-Comté, 16 route de Gray, 25030 Besançon Cedex (France); Laboratoire de Physique des Rayonnements et Applications, Université de Jijel, B.P. 98 Ouled Aissa, Jijel 18000 (Algeria); Belafrites, A. [Laboratoire de Physique des Rayonnements et Applications, Université de Jijel, B.P. 98 Ouled Aissa, Jijel 18000 (Algeria)

    2014-08-15

    We report the design of a millimeter-sized parallel plate free-air ionization chamber (IC) aimed at determining the absolute air kerma rate of an ultra-soft X-ray beam (E = 1.5 keV). The size of the IC was determined so that the measurement volume satisfies the condition of charged-particle equilibrium. The correction factors necessary to properly measure the absolute kerma using the IC have been established. Particular attention was given to the determination of the effective mean energy for the 1.5 keV photons using the PENELOPE code. Other correction factors were determined by means of computer simulation (COMSOL™and FLUKA). Measurements of air kerma rates under specific operating parameters of the lab-bench X-ray source have been performed at various distances from that source and compared to Monte Carlo calculations. We show that the developed ionization chamber makes it possible to determine accurate photon fluence rates in routine work and will constitute substantial time-savings for future radiobiological experiments based on the use of ultra-soft X-rays.

  9. Analysis of RE4 Construction Cosmic Muon Test Data and Comparison with 2015 Collision Calibration Run Data for the Newly Installed RPC Chambers in the 4th Muon Endcap Station of the CMS Detector

    E-Print Network [OSTI]

    Iqbal, Muhammad Ansar

    2015-01-01

    RPC are the heart of the muon system of CMS experiment at LHC, CERN. Recently a new endcap layer, RE4, was added to increase redundancy. These added chambers were tested during the construction period with cosmic muons in the 904 lab at Prevessin, CERN. This study analyzes the HV scan from those tests and compares them with the first 2015 collision data taken at Point-5. The analysis showed that most of the chambers were producing more than 90% efficiency and were in good agreement with the Point-5 results. Those which did not give good results were reported. Other variables like working point and maximum efficiency were also studied.

  10. Characterization of radiation beams used to determinate the correction factor for a CyberKnife® unit reference field using ionization chambers

    SciTech Connect (OSTI)

    Aragón-Martínez, Nestor Massillon-JL, Guerda; Gómez-Muñoz, Arnulfo

    2014-11-07

    This paper aimed to characterize a 6 MV x-ray beam from a Varian® iX linear accelerator in order to obtain the correction factors needed by the IAEA/AAPM new formalism{sup 1}. The experiments were performed in a liquid water phantom under different irradiation conditions: a) Calibration of the reference field of 10 cm × 10 cm at 90 cm SSD and 10 cm depth was carried out according to the TRS-398 protocol using three ionization chambers (IC) calibrated in different reference laboratory and b) Measurement of the absorbed dose rate at 70 cm SSD and 10 cm depth in a 10 cm × 10 cm and 5.4 cm × 5.4 cm fields was obtained in order to simulate the CyberKnife® conditions where maximum distance between the source and the detector is equal to 80 cm and the maximum field size is 6 cm diameter. Depending where the IC was calibrated, differences between 0.16% and 2.24% in the absorbed dose rate measured in the 10 cm × 10 cm field at 90 cm SSD were observed, while for the measurements at 70 cm SSD, differences between 1.27% and 3.88% were obtained. For the 5.4 cm × 5.4 cm field, the absorbed dose measured with the three ICs varies between 1.37% and 3.52%. The increase in the difference on the absorbed dose when decreasing the SSD could possibly be associated to scattering radiation generated from the collimators and/or the energy dependence of the ionization chambers to low-energy radiation. The results presented in this work suggest the importance of simulating the CyberKnife® conditions using other linear accelerator for obtaining the correction factors as proposed by the IAEA/AAPM new formalism in order to measure the absorbed dose with acceptable accuracy.

  11. Main Chamber Neutral Pressure in Alcator C-Mod and JET C S Pitcher, S K Erents*, W Fundamenski*, B LaBombard, B Lipschultz, G F Matthews*, G

    E-Print Network [OSTI]

    Pitcher, C. S.

    that the main plasma-wall interaction is at the target plates and that the gas resulting from this interaction, Abingdon, Oxon OX14 3DB,UK Main chamber gas can have a number of deleterious effects in divertor tokamaks. First, the gas-plasma interaction will generate neutrals which freely cross field lines and bombard

  12. 9/19/13 11:37 AMLanguage skills key to export success says The British Chambers of Commerce Page 1 of 2http://www.growthbusiness.co.uk/news-and-market-deals/business-news/2098113/language-skills-key-to-export-success-says-bcc.thtml

    E-Print Network [OSTI]

    Su, Xiao

    9/19/13 11:37 AMLanguage skills key to export success says The British Chambers of Commerce Page 1 of 2http://www.growthbusiness.co.uk/news-and-market-deals/business-news/2098113/language-skills-key-to-export Language skills key to export success says BCC The British Chambers of Commerce (BCC) is calling on UK

  13. The Nanoscience Beamline (I06) at Diamond Light Source

    SciTech Connect (OSTI)

    Dhesi, S. S.; Cavill, S. A.; Potenza, A.; Marchetto, H.; Mott, R. A.; Steadman, P.; Peach, A.; Shepherd, E. L.; Ren, X.; Wagner, U. H.; Reininger, R.

    2010-06-23

    The Nanoscience beamline (I06) is one of seven Diamond Phase-I beamlines which has been operational since January 2007 delivering polarised soft x-rays, for a PhotoEmission Electron Microscope (PEEM) and branchline, in the energy range 80-2100 eV. The beamline is based on a collimated plane grating monochromator with sagittal focusing elements, utilising two APPLE II helical undulator sources, and has been designed for high flux density at the PEEM sample position. A {approx}5 {mu}m ({sigma}) diameter beam is focussed onto the sample in the PEEM allowing a range of experiments using x-ray absorption spectroscopy (XAS), x-ray magnetic circular dichroism (XMCD) and x-ray magnetic linear dichroism (XMLD) as contrast mechanisms. The beamline is also equipped with a branchline housing a 6T superconducting magnet for XMCD and XMLD experiments. The magnet is designed to move on and off the branchline which allows a diverse range of experiments.

  14. CARS study of linewidths of the Q-branch of hydrogen molecules at high temperatures in a pulsed high-pressure H{sub 2}-O{sub 2} combustion chamber

    SciTech Connect (OSTI)

    Vereschagin, Konstantin A; Vereschagin, Alexey K; Smirnov, Valery V; Stelmakh, O M; Fabelinskii, V I; Clauss, W; Klimenko, D N; Oschwald, M

    2005-03-31

    The results of measurements of individual line widths of the Q-branch of a hydrogen molecule and the corresponding coefficients of broadening caused by collisions with water molecules at T = 2700 K in a repetitively pulsed high-pressure (50-200 atm) hydrogen-oxygen combustion chamber are presented. CARS spectra of individual Q{sub 1}-Q{sub 7} hydrogen lines, pressure pulses, and the broadband CARS spectra of the entire Q-branch of hydrogen are recorded simultaneously during a single laser pulse. The shape of line profiles was analysed using a Fabry-Perot interferometer. The temperature in the volume being probed was determined from the 'broadband' CARS spectra. The entire body of the experimental results gives information on the spectral linewidths, temperature and pressure in the combustion chamber during CARS probing. (laser applications and other topics in quantum electronics)

  15. Chemistry of ?-pinene and naphthalene oxidation products generated in a Potential Aerosol Mass (PAM) chamber as measured by acetate chemical ionization mass spectrometry

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

    Chhabra, P. S.; Lambe, A. T.; Canagaratna, M. R.; Stark, H.; Jayne, J. T.; Onasch, T. B.; Davidovits, P.; Kimmel, J. R.; Worsnop, D. R.

    2014-07-01

    Recent developments in high resolution, time-of-flight chemical ionization mass spectrometry (HR-ToF-CIMS) have made possible the direct detection of atmospheric organic compounds in real-time with high sensitivity and with little or no fragmentation, including low volatility, highly oxygenated organic vapors that are precursors to secondary organic aerosol formation. Here, for the first time, we examine gas-phase O3 and OH oxidation products of ?-pinene and naphthalene formed in the PAM flow reactor with an HR-ToF-CIMS using acetate reagent ion chemistry. Integrated OH exposures ranged from 1.2 × 1011 to 9.7 × 1011 molec cm?3 s, corresponding to approximately 1.0 to 7.5 daysmore »of equivalent atmospheric oxidation. Measured gas-phase organic acids are similar to those previously observed in environmental chamber studies. For both precursors, we find that acetate-CIMS spectra capture both functionalization (oxygen addition) and fragmentation (carbon loss) as a function of OH exposure. The level of fragmentation is observed to increase with increased oxidation. We present a method that estimates vapor pressures of organic molecules using the measured O/C ratio, H/C ratio, and carbon number for each compound detected by the CIMS. The predicted condensed-phase SOA average acid yields and O/C and H/C ratios agree within uncertainties with previous AMS measurements and ambient CIMS results. While acetate reagent ion chemistry is used to selectively measure organic acids, in principle this method can be applied to additional reagent ion chemistries depending on the application.« less

  16. Three chamber negative ion source

    DOE Patents [OSTI]

    Leung, K.N.; Ehlers, K.W.; Hiskes, J.R.

    1983-11-10

    It is an object of this invention provide a negative ion source which efficiently provides a large flux of negatively ionized particles. This invention provides a volume source of negative ions which has a current density sufficient for magnetic fusion applications and has electrons suppressed from the output. It is still another object of this invention to provide a volume source of negative ions which can be electrostatically accelerated to high energies and subsequently neutralized to form a high energy neutral beam for use with a magnetically confined plasma.

  17. Kathy Chambers | Department of Energy

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyTher i nAand DOE Safety Standards Implementation July 17,76Patterson -Written

  18. Los Alamos ChamberFest

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACTThousand CubicResourcelogo and-E CChinaC LLos t!darnos cle LOS AL

  19. Resistive Plate Chamber Passaggio di radiazione

    E-Print Network [OSTI]

    Roma "La Sapienza", Università di

    particelle ultrarelativistiche di massa diversa #12;PM particle mirrorradiator medium = 1 - - Efficienza del

  20. Recent Advances in Chamber Science and Technology

    E-Print Network [OSTI]

    California at Los Angeles, University of

    · Characterization of materials - Reduced activation Ferritic-Martensitic steel (EUROFER ) - Beryllium - BreedingLi with ferritic/martensitic steel Ps = 0.4 MW/m2Pnw= 2.2 MW/m2 B - Long Term: Other possibilities, e.g. SiPb with ferritic steel, V, and SiC - Demonstration of electrical power generation and tritium breeding in a DEMO

  1. IFE Chamber Development -To ETF and Beyond

    E-Print Network [OSTI]

    . Logan, J. D Lindl, P.F. Peterson, "An Engineering Test Facility of Heavy Ion Fusion ­ Options (~1000 MWe) Engineering Test Facility (100-300 MWe) Power Technologies for Demo Funded by NNSA · NIF phenomena testing (e.g., molten salt flow loops, x-ray exposure testing, etc.) #12;FESAC Dev Plan 5 IFE ETF

  2. A spark chamber for cosmic ray research 

    E-Print Network [OSTI]

    Jelinek, Al Vincent

    1964-01-01

    . THE LOGIC SYSTEM A. The Geiger Tube System B. The Scintillation Counter System 16 IV. THE TRIGGERED PULSE SYSTEM 22 A. The EFP60 Pulse Generator B. The Hydrogen Thyratron Pulse Generator C. The Triggered Spark Gap 22 23 27 V. THE EXPERIMENTAL... insufficient to cause sparking. The ionization trail left by a charged particle traversing a gap causes electrical breakdown of the gas, detected by the voltage pulse on one electrode. The first evidence that this sparking could be used, to locate...

  3. Pyrolysis reactor and fluidized bed combustion chamber

    DOE Patents [OSTI]

    Green, Norman W. (Upland, CA)

    1981-01-06

    A solid carbonaceous material is pyrolyzed in a descending flow pyrolysis reactor in the presence of a particulate source of heat to yield a particulate carbon containing solid residue. The particulate source of heat is obtained by educting with a gaseous source of oxygen the particulate carbon containing solid residue from a fluidized bed into a first combustion zone coupled to a second combustion zone. A source of oxygen is introduced into the second combustion zone to oxidize carbon monoxide formed in the first combustion zone to heat the solid residue to the temperature of the particulate source of heat.

  4. Mercury Chamber NF-IDS Meeting

    E-Print Network [OSTI]

    McDonald, Kirk

    windows (upstream and downstream) ­ Shell cooling? #12;4 Managed by UT-Battelle for the U.S. Department Upstream View Downstream View #12;6 Managed by UT-Battelle for the U.S. Department of Energy Mercury Isometrics Downstream Beam Window Drainage Notch Overflow & Maintenance Drains Nozzle, Beam Pipe, Vents

  5. Auditing Focus Matthew Chambers (Michigan Technological University...

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

    (California State University, San Bernardino) Casey Mortensen (New Mexico Institute of Mining and Technology) Mentor: David Kennel (DCS-1) Instructor: Andree Jacobson (NMC) 2011...

  6. LIQUID-XENON-FILLED WIRE CHAMBERS

    E-Print Network [OSTI]

    2008-01-01

    in part by the U. S. Atomic Energy Commission and in part byof the U. S. Atomic Energy Commission. tparticipation made

  7. Design of subsea energy storage chamber

    E-Print Network [OSTI]

    Greenlee, Alison S

    2009-01-01

    Energy generated from offshore resources is not reliable over short periods of time. Although wind and wave energy is fairly consistent in the long run, their short term capacity fluctuations prohibit these resources from ...

  8. Auditing Focus Matthew Chambers (Michigan Technological University)

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 OutreachProductswsicloudwsiclouddenDVA N C E D B L O O DBiomass andAtoms for Peace after1 Audit5

  9. Vacuum Chamber - Facilities - Radiation Effects Facility / Cyclotron

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorking WithTelecentric viewing systemVacancyVacancy-InducedInstitute / Texas

  10. Georges Charpak, Particle Detectors, and Multiwire Chambers

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformation Current HABFESOpportunities NuclearlongGeneralGeorge T. "Rusty"

  11. DEVELOPMENT OF A 40 mm BORE MAGNET CROSS SECTION WITH HIGH FIELD UNIFORMITY FOR THE 6.6T SSC DIPOLE

    E-Print Network [OSTI]

    Caspi, S.

    2010-01-01

    76SF00098. DEVELOPHENT OF A 40 mm BORE KAGNET CROSS SECTIONuniform dipole field. A 40 mm bo~e diameter winding cross3, 1986 DEVELOPMENT OF A 40 mm BORE MAGNET CROSS SECTION

  12. A Hermite cubic collocation scheme for plane strain hydraulic fractures Department of Mathematics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z2

    E-Print Network [OSTI]

    Peirce, Anthony

    A Hermite cubic collocation scheme for plane strain hydraulic fractures A. Peirce Department Accepted 13 February 2010 Available online 4 March 2010 Keywords: Hydraulic fractures Integro the propagation of a hydraulic fracture in a state of plane strain. Special blended cubic Hermite-power­law basis

  13. Fusion Unit EUROfusionG. Vlad Workshop "ICT e supercalcolo al servizio di ricerca e imprese risultati e prospettive" 17 marzo 2015 ENEA -Sede 1

    E-Print Network [OSTI]

    Vlad, Gregorio

    · Controlled thermonuclear fusion is one of the most promising energy sources for the next near future challenges of the present day research. · Thermonuclear fusion occurs when light elements (like Hydrogen Thermonuclear Fusion experiment (ITER) The plasma is confined in a toroidal chamber by a very high (~6T

  14. Harvesting Energy from Wastewater in a 2-Chamber

    E-Print Network [OSTI]

    an alternative form of energy before the world's fossil fuels are depleted. It is predicted that oil and gas in the productivity of a MFC, it is crucial to reduce the cost of a MFC. Introduction It is important to find is released into the atmosphere causing the atmosphere to trap solar radiation that then leads to global

  15. Jo Sexton, President, Cambridge Area Chamber of Commerce Panel...

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

    Workforce Development o K-12 and Career Technical School partnerships (welding program wPioneer Pipe) o Manufacturing Institute o Colleges and Universities o Land...

  16. E-Cloud Build-up in Grooved Chambers

    SciTech Connect (OSTI)

    Venturini, Marco

    2007-05-01

    We simulate electron cloud build-up in a grooved vacuumchamber including the effect of space charge from the electrons. Weidentify conditions for e-cloud suppression and make contact withprevious estimates of an effective secondary electron yield for groovedsurfaces.

  17. The Laser of the ALICE Time Projection Chamber

    E-Print Network [OSTI]

    G. Renault; B. S. Nielsen; J. Westergaard; J. J. GaardhØJe

    2007-03-27

    The large TPC ($95 \\mathrm{m}^3$) of the ALICE detector at the CERN LHC was commissioned in summer 2006. The first tracks were observed both from the cosmic ray muons and from the laser rays injected into the TPC. In this article the basic principles of operating the $266 \\mathrm{nm}$ lasers are presented, showing the installation and adjustment of the optical system and describing the control system. To generate the laser tracks, a wide laser beam is split into several hundred narrow beams by fixed micro-mirrors at stable and known positions throughout the TPC. In the drift volume, these narrow beams generate straight tracks at many angles. Here we describe the generation of the first tracks and compare them with simulations.

  18. FOG CHAMBER STUDIES OF SOOT-CATALYZED SO2 OXIDATION

    E-Print Network [OSTI]

    Benner, W.H.

    2013-01-01

    VACUUM BW" Boiling water F " Filter HM= Heating mantel N "Fluoropore filter was extracted in water and analyzed forfilter was analyzed for total carbon by combustion analysis. When pure water

  19. FOG CHAMBER STUDIES OF SOOT-CATALYZED SO2 OXIDATION

    E-Print Network [OSTI]

    Benner, W.H.

    2013-01-01

    VACUUM BW" Boiling water F " Filter HM= Heating mantel N "the Fluoropore filter was extracted in water and analyzedfilter was analyzed for total carbon by combustion analysis. When pure water

  20. Computation of azimuthal combustion instabilities in an helicopter combustion chamber

    E-Print Network [OSTI]

    Nicoud, Franck

    to compute azimuthal combustion instabilities is presented. It requires a thermoacoustic model using a n is investigated. Introduction Thermoacoustic instabilities result from the coupling between unstationary low CPU time cost. A thermoacoustic model is used to solve the wave equation in reactive media

  1. DEVELOPMENT OF A DRY WALL CONCEPT FOR LASER IFE CHAMBERS

    E-Print Network [OSTI]

    ://aries.ucsd.edu/ARIES/ #12;9/11/20044 Example IFE Ion Spectra 10.0E+8 1.0E+10 1.0E+11 1.0E+12 1.0E+13 1.0E+14 1.0E+15 1.0E+16 Energy (keV) 3He 12C 10.0E+8 1.0E+10 1.0E+11 1.0E+12 1.0E+13 1.0E+14 1.0E+15 1.0E+16 1.0E+17 1.0E+1 1.0E%) 154 MJ NRL Direct Drive Target 458 MJ Indirect Drive Target 10.0E+8 1.0E+10 1.0E+11 1.0E+12 1.0E+13 1

  2. www.ornl.gov Environmental Chambers at ORNL

    E-Print Network [OSTI]

    Oak Ridge National Laboratory

    -air HVAC system, heat pump water heaters, a dehumidifying water heater, solid-state lighting, hybrid solar&D Capabilities The DOE/ORNL Heat Pump Design Model (HPDM) is a well-proven hardware-based analysis tool linked to TRNSYS for analyzing the annual performance of advanced designs such as integrated heat pumps

  3. Properties of a Moscow Glass Gas Microstrip Chamber

    E-Print Network [OSTI]

    and excellent position resolution that make it a rele­ vant technology for tracking at the Large Hadron Collider

  4. Coal-feeding mechanism for a fluidized bed combustion chamber

    DOE Patents [OSTI]

    Gall, Robert L. (Morgantown, WV)

    1981-01-01

    The present invention is directed to a fuel-feeding mechanism for a fluidized bed combustor. In accordance with the present invention a perforated conveyor belt is utilized in place of the fixed grid normally disposed at the lower end of the fluidized bed combustion zone. The conveyor belt is fed with fuel, e.g. coal, at one end thereof so that the air passing through the perforations dislodges the coal from the belt and feeds the coal into the fluidized zone in a substantially uniform manner.

  5. Proceedings of the Workshop on Radiation Damage to Wire Chambers

    E-Print Network [OSTI]

    Kadyk, J.A.

    2010-01-01

    operated in argon (60070) + ethane (40070) before (top) andit ! "". , /" ft:_o-~o---o ETHANE (PURE) -x- ISOBUTANE 199~Z t- v ).. I,() WAVE LENGTH -v- ETHANE+ETHANOL 1+1' C. -2hl

  6. www.ornl.gov Environmental Chambers at ORNL

    E-Print Network [OSTI]

    Pennycook, Steve

    , desiccant systems, and small distributed generation/combined heat and power (CHP) systems with capacities conditioning, ventilation, water heating, and indoor environmental quality) with much greater energy efficiency-air HVAC system, heat pump water heaters, a dehumidifying water heater, solid-state lighting, hybrid solar

  7. The Meditation Chamber : A Debriefing A. Fleming Seay

    E-Print Network [OSTI]

    Shaw, Chris

    the environment, shaping the user's experience. Subjective and Objective Results A t-test showed that self report and a collection of biometric sensors. The three phases included an initial relaxation phase, a progressive muscle-nine of the 411 participants reported equal or lower levels of relaxation following the experience, with 18

  8. Resources at Princeton U. Relevant to BABAR Drift Chamber

    E-Print Network [OSTI]

    McDonald, Kirk

    (+ VPI), '95--. 4 #12; Present Resources Elementary Particles Lab Mechanical Group: -- Bill Sands at BNL, FNAL, SLAC after construction at Princeton. Mechanical design aided by AutoCAD and ALGOR (FEA­ray group founded by J.A. Wheeler in 1946. The present Elementary Particle Laboratory buildings housed

  9. Resources at Princeton U. Relevant to BABAR Drift Chamber

    E-Print Network [OSTI]

    McDonald, Kirk

    ;Present Resources Elementary Particles Lab Mechanical Group: ­ Bill Sands, engineer ­ Bill Groom, Bob construction at Princeton. Mechanical design aided by AutoCAD and ALGOR (FEA). Two assembly buildings with 7 group founded by J.A. Wheeler in 1946. The present Elementary Particle Laboratory buildings housed fac

  10. DOSIMETRY, INSTRUMENTATION AND EXPOSURE CHAMBERS FOR DC MAGNETIC HELD STUDIES

    E-Print Network [OSTI]

    Tenforde, T.S.

    2010-01-01

    C. Dols D. Nelson DOSIMETER DEVELOPMENT (Instrumentmagnetic field personnel dosimeter with data acquisitionFIELD BIOMEDICAL AND DOSIMETER DEVELOPMENT PROGRAMS AT THE

  11. Fast sampling calorimetry with solid argon ionization chambers

    SciTech Connect (OSTI)

    Clark, E.; Linn, S.; Piekarz, H.; Wahl, H.; Womersley, J.; Hansen, S.; Hurh, P.; Rivetta, C.; Sanders, R.; Schmitt, R.; Stanek, R.; Stefanik, A.

    1992-12-31

    A proposal for the fast sampling calorimetry with solid argon as active medium and the preliminary results from the solid argon test cell are presented. The proposed test calorimeter module structure, the signal routing and the mechanical and cryogenic arrangements are also discussed.

  12. LIQUID XENON FILLED WIRE CHAMBERS FOR MEDICAL IMAGING APPLICATIONS

    E-Print Network [OSTI]

    Derenzo, S.E.; Budinger, T.F.; Smits, R.G.; Zaklad, H.; Alvarez, L.W.

    2008-01-01

    for the U. S. Atomic Energy Commission under Contract W -of the U. S. Atomic Energy Commission. scintillation camera.

  13. THE IMAGING PERFORMANCE OF A MULTIWIRE PROPORTIONAL CHAMBER POSITRON CAMERA

    E-Print Network [OSTI]

    Perez-Mendez, V.

    2010-01-01

    and tf. R. Kelson, "The EGS Code system: Computer programand Problem Model The EGS Code: General Considerations Totransport code called EGS (Eleetron-Gaama-Shower)'")

  14. On-Site Wastewater Treatment Systems: Leaching Chambers (Spanish) 

    E-Print Network [OSTI]

    Lesikar, Bruce J.; Enciso, Juan

    2000-10-13

    para el tratamiento de aguas negras,? puede obtenerse gratis del World Wide Web en: http://texaserc.tamu.edu/pubs/ewaste Los programas educacionales del Servicio de Extensi?n Agr?cola de Texas est?n disponibles para todas las personas, sin distinci?n de... raza, color, sexo, minusvalid?z, religi?n, edad u origen nacional. Emitido en promoci?n del Trabajo Cooperativo de Extensi?n Agr?cola y Econom?a del Hogar, Decreto del Congreso del 8 de mayo de 1914, seg?n enmienda, y del 30 de junio de 1914, en...

  15. Funeral Processions and the Chamber Tombs of Knossos

    E-Print Network [OSTI]

    Parr, Josh

    2014-08-31

    tombs are vaulted,9 circular structures with walls a meter or more wide. Their inner diameter ranges anywhere between 2.5 meters (Apesokari) and 13 meters (Platanos A). Their single entrance is often quite short (64cm high at Lebena II) and often... 5kg.34 Based on this figure, I acquired a 5kg vessel and carried it as far as my arms would allow me, making sure to hold it in front of myself as is shown Figure 10. After seven-hundred meters, my arms and back were hurting so much that I...

  16. 6. Drift Chamber 6.1. Purpose and Design Requirements

    E-Print Network [OSTI]

    (DCH) is the efficient detection of charged parti- cles and the measurement of their momenta and angles field wires and a helium-based gas mix- ture, the multiple scattering inside the DCH is held to a minimum, less than 0.2%X0 of mate- rial. The properties of the chosen gas, a 80:20 mixture of helium

  17. Readout of TPC Tracking Chambers with GEMs and Pixel Chip

    E-Print Network [OSTI]

    Kim, T.

    2008-01-01

    TPC) readout at the International Linear Collider (ILC). Thechamber at the International Linear Collider (ILC) is the

  18. Overview of Chamber and Power Plant Designs for IFE

    E-Print Network [OSTI]

    (all fusion). · Breed, recover and recycle tritium to provide a self-sustained fuel cycle (all fusion NAS Review 1/30/11 9 Direct drive energy split: 2% x-rays 28% ions 70% neutrons Indirect drive energy

  19. Microfluidic cell culture chambers with nanoporous walls for chemical communication

    E-Print Network [OSTI]

    Ge, Zhifei, S.M. Massachusetts Institute of Technology

    2013-01-01

    Reconstruction of phylogenetic trees based on 16S rRNA gene sequencing reveals that so far only a tiny fraction of microbial diversity has been cultured in the laboratory. One major reason behind this "unculturability" is ...

  20. Engineering design of a hypobaric plant growth chamber 

    E-Print Network [OSTI]

    Purswell, Joseph Lawrence

    2002-01-01

    This system was developed to measure the effects of low-atmospheric pressure on the growth and function of plants for applications in Advanced Life Support systems research. The system is composed of six independent growth vessels...

  1. Development of Microstrip Gas Chambers for Radiation Detection...

    Office of Scientific and Technical Information (OSTI)

    Bibtex Format Close 0 pages in this document matching the terms "" Search For Terms: Enter terms in the toolbar above to search the full text of this document for pages...

  2. A Characterization of a Dual Chambered, Two Phase Separator 

    E-Print Network [OSTI]

    Klein, Casey

    2012-02-14

    separator and is meant to determine the minimum inlet gas flow rate necessary for a stable vortex inside the separator for different separator geometries. A dimensional scaling analysis was done to predict this minimum inlet gas flow rate. Experiments were...

  3. The American Chamber of Commerce of Trinidad & Tobago | Department...

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

    facing the world are: Will the necessary investments be made to bring sufficient hydrocarbons to market? Is the investment climate in producing countries conducive to inviting...

  4. Continuous Flow Diffusion Chamber Measurements of IN Concentration

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit the followingConcentrating Department of Energy'sContango in150.1A,Flow

  5. Argon Time Projection Chamber(LArTPC) Data Jessica Esquivel

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room News Publications TraditionalWithAntiferromagnetic SpinsSolicitations &KnoxvilleProcessing

  6. Federation of Indian Chambers of Commerce & Industry (FICCI) | Department

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergy A plug-inPPLforLDRD Report to CongressApril 6, 2012 ApplicationIncludes Pre-Marchof

  7. China New Energy Chamber of Commerce CNECC | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LISTStar Energy LLCLtd Jump to:Changing

  8. Saku Chamber of Commers Indsutry | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoop Inc Jump to:Newberg,EnergyEastCarbon Development |SMCHarbor Water

  9. Santa Fe Chamber of Commerce Business Awards Gala

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust, High-ThroughputUpcoming ReleaseSecurity Administration wins twoSanket A.Santa Fe

  10. Chambers County, Alabama: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmentalBowerbank,CammackFLIR Jump to:RAPIDCavalloCerion Energy IncChalfant,Chalmers

  11. Chambers County, Texas: Energy Resources | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION JEnvironmentalBowerbank,CammackFLIR Jump to:RAPIDCavalloCerion Energy IncChalfant,ChalmersTexas:

  12. NIF Target Chamber Dedicated | National Nuclear Security Administration

    National Nuclear Security Administration (NNSA)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield Municipal GasAdministration Medal of Honor recipients honored atIAEA Reporting, GeneralNGSINIF

  13. Development of Microstrip Gas Chambers for Radiation Detection and Tracking

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnectlaser-solidSwitchgrass and Miscanthus x| SciTechApplicationat High

  14. Development of Microstrip Gas Chambers for Radiation Detection and Tracking

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnectlaser-solidSwitchgrass and Miscanthus x| SciTechApplicationat Highat

  15. Automated soil gas monitoring chamber (Patent) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing Bacteria (Technical Report) | SciTech ConnectPatent: Automated soil gas monitoring

  16. Automated soil gas monitoring chamber (Patent) | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing Bacteria (Technical Report) | SciTech ConnectPatent: Automated soil gas

  17. Gas Electron Multiplier (GEM) Chamber Characteristics Test (Technical

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) |productionPatent: FreeformArticle)Gamma source

  18. Gas Electron Multiplier (GEM) Chamber Characteristics Test (Technical

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing(Journal Article) |productionPatent: FreeformArticle)Gamma sourceReport) | SciTech

  19. Scaling Law of Coherent Synchrotron Radiation in a Rectangular Chamber

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference) | SciTechsaturated fractured rock (Journal

  20. Scaling Law of Coherent Synchrotron Radiation in a Rectangular Chamber

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference) | SciTechsaturated fractured rock (Journal(Journal Article) | SciTech

  1. Scaling law of coherent synchrotron radiation in a rectangular chamber

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTechtail. (Conference) | SciTechsaturated fractured rock (Journal(Journal Article) |

  2. Luis Alvarez, the Hydrogen Bubble Chamber, Tritium, and Dinosaurs

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesse BergkampCentermillion to localPartnership will aidLSMCELower crudeLuis

  3. Donald Glaser, the Bubble Chamber, and Elementary Particles

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit theCovalentLaboratory |Sector Full reportTown2008 FinalDonDonald Glaser

  4. 01/04/2008 12:00The Skeptics Society Forum View topic -eSkeptic: July 18, 2007 Page 1 of 8http://www.skepticforum.com/viewtopic.php?f=6&t=8347&p=111722

    E-Print Network [OSTI]

    Reece, Sarah

    LIVE ON UFOS I thought eSkeptic readers might appreciate some of the more amusing (and nasty) letters I's "UFO sighting" on the way to the moon, recounted by him on the show (revealing UFOlogist Stanton of the story -- which was that the UFO turned out to be one of the panels from the Apollo rocket booster -- so

  5. Search for Neutral Heavy Leptons in the NuTeV Experiment at Fermilab R. B. DRUCKER 6 , T. ADAMS 4 , A. ALTON 4 , S. AVVAKUMOV 7 , L. de BARBARO 5 , P. de BARBARO 7 ,

    E-Print Network [OSTI]

    TeV calorimeter, allows detection in several decay modes (#22;#22;#23;, #22;e#23;, #22;#25;, e#25;, and ee#23 is an instrumented decay space upstream of the calorimeter. The channel is 30 m long and #12;lled with helium using 4.6 m diameter plastic bags. The helium was used to reduce the number of neutrino in- teractions

  6. Itinerant ferromagnetism in the As 4p conduction band of Ba0.6K0.4Mn2As2 identified by x-ray magnetic circular dichroism

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

    Ueland, B. G.; Pandey, Abhishek; Lee, Y.; Sapkota, A.; Choi, Y.; Haskel, D.; Rosenberg, R. A.; Lang, J. C.; Harmon, B. N.; Johnston, D. C.; et al

    2015-05-27

    In this study, x-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba0.6K0.4Mn2As2 show that the ferromagnetism below TC ? 100 K arises in the As 4p conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below TC, however, a clear XMCD signal is found at the As K edge which increases with decreasing temperature. The XMCD signal is absent in data taken with the beam directed parallel to the crystallographic c axis indicating that the orbital magnetic moment lies in the basal plane of the tetragonal lattice. These results show that themore »previously reported itinerant ferromagnetism is associated with the As 4p conduction band and that distinct local-moment antiferromagnetism and itinerant ferromagnetism with perpendicular easy axes coexist in this compound at low temperature.« less

  7. Local Structure Analysis of Materials for Increased Energy Efficiency

    E-Print Network [OSTI]

    Medling, Scott

    2012-01-01

    +B, left polarized +B, right polarized Energy (eV) ?B,left polarized ?B, right polarized Energy (eV) Figure 3.4:polarized ?B, right polarized XMCD(x10) Energy (eV) Figure

  8. Development of compact linear accelerator in KBSI

    SciTech Connect (OSTI)

    Yoon, Jang-Hee; Lee, Byoung-Seob; Choi, Seyong; Park, Jin Yong; Ok, Jung-Woo; Won, Mi-Sook [Busan Center, Korea Basic Science Institute, Busan 609-735 (Korea, Republic of)

    2012-02-15

    The compact linear accelerator using a 28 GHz ECRIS is under construction in KBSI, South Korea. The main capability of this facility is the production of fast neurons for the neutron radiography. The designing of a superconducting magnet, microwave transmission system, beam extraction, and plasma chamber of ECRIS were finished. The nominal axial design fields of the magnets are 3.6 T at injection and 2.2 T at extraction; the nominal radial design field strength at the plasma chamber wall is 2.1 T. We already installed 10 kW, 28 GHz gyrotron, and tested a microwave power from gyrotron using a dummy load. The current status will be discussed in this paper.

  9. X-ray magnetic circular dichroism and small angle neutron scattering studies of thiol capped gold nanoparticles.

    SciTech Connect (OSTI)

    de la Venta, J.; Bouzas, V.; Pucci, A.; Laguna-Marco, M. A.; Haskel, D.; te Velthuis, S. G. E; Hoffmann, A.; Lal, J.; Bleuel, M.; Ruggeri, G.; de Julian Fernandez, C.; Garcia, M. A.; Univ.Complutense de Madrid; Inst. de Magnetismo Aplicado; Univ. of Pisa; Lab. di Magnetismo Molecolare

    2009-01-01

    X-ray magnetic circular dichroism (XMCD) and Small Angle Neutron Scattering (SANS) measurements were performed on thiol capped Au nanoparticles (NPs) embedded into polyethylene. An XMCD signal of 0.8 {center_dot} 10{sup -4} was found at the Au L{sub 3} edge of thiol capped Au NPs embedded in a polyethylene matrix for which Superconducting Quantum Interference Device (SQUID) magnetometry yielded a saturation magnetization, M{sub s}, of 0.06 emu/g{sub Au}. SANS measurements showed that the 3.2 nm average-diameter nanoparticles are 28% polydispersed, but no detectable SANS magnetic signal was found with the resolution and sensitivity accessible with the neutron experiment. A comparison with previous experiments carried out on Au NPs and multilayers, yield to different values between XMCD signals and magnetization measured by SQUID magnetometer. We discuss the origin of those differences.

  10. X-ray magnetic circular dichroism and small angle neutron scattering study of thiol capped gold nanoparticles.

    SciTech Connect (OSTI)

    de la Venta, J.; Bouzas, V.; Pucci, A.; Laguna-Marco, M. A.; Haskel, D.; Pinel, E. F.; te Velthuis, S. G. E.; Hoffmann, A.; Lal, J.; Bleuel, M.; Ruggeri, G.; de Julian, C.; Garcia, M. A.; Univ. Complutense de Madrid; Inst. de Magnetismo Aplicado UCM; Univ. Pisa; Univ. di Padova

    2009-11-01

    X-ray magnetic circular dichroism (XMCD) and Small Angle Neutron Scattering (SANS) measurements were performed on thiol capped Au nanoparticles (NPs) embedded into polyethylene. An XMCD signal of 0.8 {center_dot} 10{sup -4} was found at the Au L{sub 3} edge of thiol capped Au NPs embedded in a polyethylene matrix for which Superconducting Quantum Interference Device (SQUID) magnetometry yielded a saturation magnetization, M{sub s}, of 0.06 emu/g{sub Au}. SANS measurements showed that the 3.2 nm average-diameter nanoparticles are 28% polydispersed, but no detectable SANS magnetic signal was found with the resolution and sensitivity accessible with the neutron experiment. A comparison with previous experiments carried out on Au NPs and multilayers, yield to different values between XMCD signals and magnetization measured by SQUID magnetometer. We discuss the origin of those differences.

  11. THERMO FLUID DYNAMICS AND CHAMBER AEROSOL BEHAVIOR FOR THIN LIQUID WALL UNDER IFE

    E-Print Network [OSTI]

    Raffray, A. René

    - vantages of a renewable armor to accommodate the X-ray and ion threat produced by inertial fusion energy and Center for Energy Research, EBU-II, Room 460, La Jolla, California 92093-0417 Georgia Institute Diego, Center for Energy Research, EBU-II, Room 460, La Jolla, California 92093-0417 # Idaho National

  12. Blood meal host preferences of Culex salinarius Coquillett (Diptera : culicidae) in Chambers County, Texas 

    E-Print Network [OSTI]

    Grieco, John Paul

    1994-01-01

    of specimens having fed on armadillos. Cx. salinarius populations sampled at the up-county site demonstrated greater tendency to select birds as bloodmeal sources. Mosquito specimens at this site tested positive for either passeriiform or ciconiiform birds...

  13. Effect of nitrate on the performance of single chamber air cathode microbial fuel cells

    E-Print Network [OSTI]

    Tullos, Desiree

    and Ecological Engineering, Oregon State University, 116 Gilmore Hall, Corvallis, OR 97331, USA b Department due to the competition between the electricity generation and denitrification processes. Over 84 by the electricity generation process. No electricity was generated when the MFC fed with 8.0 mM nitrate was moved

  14. Development of a compensation chamber for use in a multiple condenser loop heat pipe

    E-Print Network [OSTI]

    Roche, Nicholas Albert

    2013-01-01

    The performance of many electronic devices is presently limited by heat dissipation rates. One potential solution lies in high-performance air-cooled heat exchangers like PHUMP, the multiple condenser loop heat pipe presented ...

  15. March 21-22, 2006 HAPL meeting, ORNL Status of Chamber and Blanket Effort

    E-Print Network [OSTI]

    Raffray, A. René

    to a Brayton power cycle #12;March 21-22, 2006 HAPL meeting, ORNL 3 350 MJ-Class Baseline Target Spectra

  16. A Liquid Xenon Ionization Chamber in an All-fluoropolymer Vessel

    SciTech Connect (OSTI)

    LePort, F.; Pocar, A.; Bartoszek, L.; DeVoe, R.; Fierlinger, P.; Flatt, B.; Gratta, G.; Green, M.; Montero Diez, M.; Neilson, R.; O'Sullivan, K.; Wodin, J.; Woisard, D.; Baussan, E.; Breidenbach, M.; Conley, R.; Fairbank, W., Jr.; Farine, J.; Hall, K.; Hallman, D.; Hargrove, C.; /Stanford U., Phys. Dept. /Applied Plastics Technology, Bristol/Neuchatel U. /SLAC /Colorado State U. /Laurentian U. /Carleton U. /Alabama U. /Moscow, ITEP; ,

    2007-02-26

    A novel technique has been developed to build vessels for liquid xenon ionization detectors entirely out of ultra-clean fluoropolymer. We describe the advantages in terms of low radioactivity contamination, provide some details of the construction techniques, and show the energy resolution achieved with a prototype all-fluoropolymer ionization detector.

  17. U.S. Chamber of Commerce's 4th Annual North America Forum | Department...

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

    completed this summer. That document will include an overview of the continent's biomass feedstocks, an analysis of second- and third-generation technologies, data on synergies and...

  18. U.S. Chamber of Commerce Biofuels Dialogue Series: Outlook for...

    Office of Environmental Management (EM)

    Wisconsin and Tennessee that will work to apply the great strides we've made in human genomics to our energy challenges. In addition, last February we announced the selection of...

  19. Environmental Chamber Study of Atmospheric Chemistry and Secondary Organic Aerosol Formation Using Cavity Enhanced Absorption Spectroscopy

    E-Print Network [OSTI]

    Liu, Yingdi

    2011-01-01

    modelling: a review. Atmospheric Chemistry and Physics,emerging issues. Atmospheric Chemistry and Physics, 2009. 9:aqueous phase. Atmospheric Chemistry and Physics, 2009. 9:

  20. Fatigue cracking of a bare steel first wall in an inertial confinement fusion chamber

    SciTech Connect (OSTI)

    Hunt, R. M.; Abbott, R. P.; Havstad, M. A.; Dunne, A. M.

    2013-06-01

    Inertial confinement fusion power plants will deposit high energy X-rays onto the outer surfaces of the first wall many times a second for the lifetime of the plant. These X-rays create brief temperature spikes in the first few microns of the wall, which cause an associated highly compressive stress response on the surface of the material. The periodicity of this stress pulse is a concern due to the possibility of fatigue cracking of the wall. We have used finite element analyses to simulate the conditions present on the first wall in order to evaluate the driving force of crack propagation on fusion-facing surface cracks. Analysis results indicate that the X-ray induced plastic compressive stress creates a region of residual tension on the surface between pulses. This tension film will likely result in surface cracking upon repeated cycling. Additionally, the compressive pulse may induce plasticity ahead of the crack tip, leaving residual tension in its wake. However, the stress amplitude decreases dramatically for depths greater than 80–100 ?m into the fusion-facing surface. Crack propagation models as well as stress-life estimates agree that even though small cracks may form on the surface of the wall, they are unlikely to propagate further than 100 ?m without assistance from creep or grain erosion phenomena.

  1. A LARGE HIGH CURRENT DENSITY SUPERCONDUCTING SOLENOID FOR THE TIME PROJECTION CHAMBER EXPERIMENT

    E-Print Network [OSTI]

    Green, M.A.

    2011-01-01

    TPC magnet integrates the superconduct- ing coil, the quenchto 1978 Applied Superconductivity Conference in Pittsburgh,HIGH CURRENT DENSITY SUPERCONDUCTING SOLENOID FOR THE TIME

  2. Automatic detection of dimension errors in spreadsheets Chris Chambers, Martin Erwig

    E-Print Network [OSTI]

    Erwig, Martin

    University, USA a r t i c l e i n f o Keywords: Spreadsheet Dimension Unit of measurement Static analysis Inference rule Error detection a b s t r a c t We present a reasoning system for inferring dimension information in spreadsheets. This system can be used to check the consistency of spreadsheet formulas and thus

  3. Ultra-high-resolution time projection chambers with liquid crystal backplanes

    SciTech Connect (OSTI)

    Monreal, Benjamin

    2014-10-15

    We investigated the possibility of incorporating a liquid-crystal device into a gas ionization detector. After extensive R&D on several candidate liquid-crystal technologies, we developed some novel materials allowing twisted nematic liquid-crystal layers to be coupled directly to gas ionization counters. However, the resulting structures were unsuitable for large-scale or practical use. We tested several technologies known to result in mechanically-robust liquid crystal electrooptic layers, but found poor behavior in the detector context.

  4. On the analogy between vehicle and vehicle-like cavities with reverberation chambers

    E-Print Network [OSTI]

    Herbert, Steven; Loh, Tian-Hong; Wassell, Ian; Rigelsford, Jonathan

    2014-10-17

    to what extent this analogy is valid. Specifically, the cavity time constant, electromagnetic isolation and electric field uniformity are investigated for typical vehicle and vehicle-like cavities. It is found that the time constant is a global property...

  5. Negative plasma potential in a multidipole chamber with a dielectric coated plasma boundary

    SciTech Connect (OSTI)

    Sheehan, J. P.; Hershkowitz, Noah

    2012-05-15

    Negative plasma potentials with respect to a grounded wall that was coated with a dielectric have been achieved in an electropositive plasma confined by a multidipole device. A Langmuir probe was used to measure the density and temperatures of the bi-Maxwellian distribution electrons and an emissive probe was used to measure the plasma potential profile near the plasma boundary. For many discharge parameters, the potential profile was that of a typical electropositive sheath, but it was shifted negative due to negative charge accumulated on the plasma-surface boundary. A virtual cathode was observed near the boundary when the neutral pressure, primary electron energy, and/or discharge current were low ({approx}2 x 10{sup -4} Torr, {approx}60 eV, and 80 mA, respectively). The behavior of the sheath potential was shown to be consistent with that predicted by particle balance and a qualitative mechanism for wall charging is presented.

  6. Dwelling in Dreams: A Comparative Study of Dream of the Red Chamber and Finnegans Wake

    E-Print Network [OSTI]

    Zhang, Mingming

    2009-01-01

    mood and lives in self-reproach and self-contempt day andobject and displaces its reproach against the object ontothe Stone’s repressed reproach towards the primeval Mother

  7. Tungsten as first wall material in the main chamber of ASDEX Upgrade

    E-Print Network [OSTI]

    . The carbon tiles were shaped to reduce edge erosion and coated with 0 6 ¡ 1 5 µm tungsten by Plasma Arc experiments are using carbon as plasma facing material. Due to the codepo- sition of tritium with carbon a future fusion reactor has to minimise the graphite plasma facing components [1]. A promising alternative

  8. Environmental Chamber Studies of Reduced Nitrogen Compounds Observed in Anthropogenic Emissions

    E-Print Network [OSTI]

    Price, Derek Jason

    2015-01-01

    of Secondary Aliphatic Amines with Hydroxyl and Nitrateof aliphatic amines with hydroxyl and nitrate radicals.of aliphatic amines with hydroxyl and nitrate radicals.

  9. How to Make Cathodes with a Diffusion Layer for Single-Chamber Microbial Fuel Cells

    E-Print Network [OSTI]

    ) The instructions below describe how to make 12 cm2 circular cathodes with a polytetrafluoroethylene (PTFE wait time. Pt/C Catalyst Layer PTFE Diffusion Layers AIR SIDESOLUTION SIDE Carbon Cloth Carbon Base Layer Figure 1: Exaggerated side-view of a cathode with a four-coating PTFE diffusion layer Materials

  10. Roughness Tolerance Studies for the Undulator Beam Pipe Chamber of LCLS-II

    E-Print Network [OSTI]

    Bane, K

    2014-01-01

    We investigate the effect of wall roughness on the wakefield-induced energy variation in the undulator beam pipe of LCLS-II. We find that a wall roughness equivalent to an rms surface slope of 30 mr increases the total induced energy variation within the bunch (due to the resistive wall wake) by a modest 20%.

  11. Micro-chamber filling experiments for validation of macro models with applications in capillary driven microfluidics 

    E-Print Network [OSTI]

    Gauntt, Stephen Byron

    2009-05-15

    Prediction of bubble formation during filling of microchambers is often critical for determining the efficacy of microfluidic devices in various applications. In this study experimental validation is performed to verify the predictions from a...

  12. A Cultural Resources Survey for the Smith Point 3-D Seismic Project in Chambers County Texas 

    E-Print Network [OSTI]

    Moore, William; Baxter, William

    2015-07-24

    Exploration and Production Company of Houston, Texas in high probability areas were shovel tested. No archaeological sites were found, and no artifacts were collected. Copies of this report are on file at the Texas Historical Commission (THC), United States...

  13. A template modeling for an assembly control : the source chamber alignment

    E-Print Network [OSTI]

    Guerra, Simone, M. Eng. Massachusetts Institute of Technology

    2007-01-01

    Managers and engineers are trying to lead Varian Semiconductor Equipment to a flow line shipment program, the intent being to eliminate the clean room area and ship all of the components of the ion implanter directly from ...

  14. Laboratory study on intracranial hypotension created by pumping the chamber of a hydrocephalus shunt

    E-Print Network [OSTI]

    Bromby, Adam; Czosnyka, Zofia; Allin, David M.; Richards, Hugh K.; Pickard, John D.; Czosnyka, Marek

    2007-03-26

    of the Orbis-Sigma valve and the Diamond valve, which work by a principle of stabilizing flow over wide range of differential pressures. The Codman Programmable Valve (with Siphon-Guard), the Medtronic Delta and Strata Valves all had siphon-pre- venting devices... of tested shunts. Name Manufacturer Sub-types tested Performance level Catalogue Number Hakim-Precision Valve Codman Micro Valve and standard Medium 82–3028 82–3013 Hakim Programmable Codman 3 cmH2O and 20 cmH2O 82–3110 Hakim Programmable with Siphon...

  15. Technologies for Mass Producing IFE Targets and Determining Their Survival in an IFE Target Chamber

    E-Print Network [OSTI]

    ) Microencapsulation: oil­water­oil double emulsion (ii) Wall-thickness control (iii)Solvent removal--CO2 critical;OMEGA-scale DT-wetted foam targets have demonstrated acceptable capsule and ice specifications E19652. Thickness uniformity of the foam wall DT ice layer in the foam capsule ­1-nm-rms roughness Foam capsule:

  16. Dual Wavelength Polarimetry for Glucose Sensing in the Anterior Chamber of the Eye 

    E-Print Network [OSTI]

    Malik, Bilal Hameed

    2012-02-14

    Clinical guidelines dictate that frequent blood glucose monitoring in diabetic patients is critical towards proper management of the disease. Although, several different types of glucose monitors are now commercially ...

  17. COURSES -LESSONS & CHAMBER MUSIC: Performance and Concert Requirements -Cont'd YR Instrument/Voice

    E-Print Network [OSTI]

    Aalberts, Daniel P.

    /Expectations 6 7 Instructor: Honors Recital: 3 4 5 2 Title: Discipline: Advisor: Group A: 1 8 Group B: Other at Williams; i.e., for eight semesters. Majors are required to participate in departmental ensembles that students elect at least one course from each group. The department reserves the right to refuse

  18. COURSES -LESSONS & CHAMBER MUSIC: Performance and Concert Requirements -Cont'd YR Instrument/Voice

    E-Print Network [OSTI]

    Aalberts, Daniel P.

    : 3 4 5 2 Title: Discipline: Advisor: Group A: 1 8 Group B: Other Courses: Music majors are strongly to participate in departmental ensembles throughout their careers at Williams; i.e., for eight semesters. Majors from each group. The department reserves the right to refuse registration in any course for which

  19. How to Build a Cosmic-Ray Cloud Chamber October 2008, Version 1.4

    E-Print Network [OSTI]

    Quigg, Chris

    to help block ambient light. Local fabric store $4.00 10 Wood shims (Paint stirrers work fine.) Four Local or pellets. Meijer®, local butcher shops or ice creameries $15.00 Tools: · Scissors · Rulers · Paper towel

  20. Hot-filament chemical vapor deposition chamber and process with multiple gas inlets

    DOE Patents [OSTI]

    Deng, Xunming; Povolny, Henry S.

    2004-06-29

    A thin film deposition method uses a vacuum confinement cup that employs a dense hot filament and multiple gas inlets. At least one reactant gas is introduced into the confinement cup both near and spaced apart from the heated filament. An electrode inside the confinement cup is used to generate plasma for film deposition. The method is used to deposit advanced thin films (such as silicon based thin films) at a high quality and at a high deposition rate.

  1. Anode supported single chamber solid oxide fuel cells operating in exhaust gases of thermal engine

    E-Print Network [OSTI]

    Boyer, Edmond

    conditions is selected. It is composed of hydrocarbons (HC: propane and propene), oxygen, carbon monoxide hydrocarbons, pollutant emissions reduction hal-01056363,version1-21Aug2014 #12;1. Introduction Solid oxide. Conventional solid oxide fuel cells are separated into two compartments containing each electrode split

  2. Parties for rent? Ambition, ideology, and party switching in Brazil's chamber of deputies

    E-Print Network [OSTI]

    Desposato, S W

    2006-01-01

    and Presidentialism in Brazil. In S. Mainwaring and M. S.Deadlock of Democracy in Brazil. Ann Arbor: The Universityin Nineteenth-Century Brazil. Stanford: Stanford University

  3. Coke battery with 51-m{sup 3} furnace chambers and lateral supply of mixed gas

    SciTech Connect (OSTI)

    V.I. Rudyka; N.Y. Chebotarev; O.N. Surenskii; V.V. Derevich [Giprokoks, the State Institute for the Design of Coke-Industry Enterprises, Kharkov (Ukraine)

    2009-07-15

    The basic approaches employed in the construction of coke battery 11A at OAO Magnitogorskii Metallurgicheskii Kombinat are outlined. This battery includes 51.0-m{sup 3} furnaces and a dust-free coke-supply system designed by Giprokoks with lateral gas supply; it is heated exclusively by low-calorific mixed gas consisting of blast-furnace gas with added coke-oven gas. The 82 furnaces in the coke battery are divided into two blocks of 41. The gross coke output of the battery (6% moisture content) is 1140000 t/yr.

  4. Hydrogen production in single-chamber tubular microbial electrolysis cells using non-precious-metal catalysts

    E-Print Network [OSTI]

    Tullos, Desiree

    warming and the finite supply of fossil fuels, hydrogen as a clean energy carrier for the future has drawn excellent catalytic capabil- ities and popularity in microbial fuel cell (MFC) studies [3]. Several] synthesized tungsten carbide powder via a carburization procedure and explored its electrocatalytic behavior

  5. Architectures for individual and stacked micro single chamber solid oxide fuel cells

    E-Print Network [OSTI]

    Crumlin, Ethan J

    2007-01-01

    Solid oxide fuel cells (SOFCs) are electrochemical conversion devices that convert various fuel sources directly into electrical energy at temperatures ranging from 600°C to 1000°C. These high temperatures could potentially ...

  6. U.S. Chamber of Commerce Biofuels Dialogue Series: Outlook for...

    Energy Savers [EERE]

    tremendous hydrocarbon resources must turn their attention to alternative and renewable energy. Because the fact is, the world needs safe, reliable, clean, affordable, and...

  7. Review of internal combustion engine combustion chamber process studies at NASA Lewis Research Center

    SciTech Connect (OSTI)

    Schock, H.J.

    1984-01-01

    The performance of internal combustion stratified-charge engines is highly dependent on the in-cylinder fuel-air mixing processes occurring in these engines. Current research concerning the in-cylinder airflow characteristics of rotary and piston engines is presented. Results showing the output of multidimensional models, laser velocimetry measurements and the application of a holographic optical element are described. Models which simulate the four-stroke cycle and seal dynamics of rotary engines are also discussed.

  8. Demonstration of a light-redirecting skylight system at the Palm Springs Chamber of Commerce

    SciTech Connect (OSTI)

    Lee, E.S.; Beltran, L.O.; Selkowitz, S.E. [Lawrence Berkeley National Lab., CA (United States); Lau, H.; Ander, G.D. [Southern California Edison, San Dimas, CA (United States)

    1996-05-01

    As part of a demonstration project to provide a comprehensive energy upgrade to a 294 m{sup 2} (3168 ft{sup 2}) commercial building, an advanced skylight design was developed using optical light control materials and geometry to provide daylight to two adjoining offices. The skylight system was developed using outdoor physical model tests and simulation tools Limited on-site measurements and occupant polls were conducted. Market issues were addressed. The skylight systems were found to improve lighting quality and to control excessive daylight illuminance levels compared to a conventional diffusing bubble skylight. Daylighting principles developed in earlier work for vertical glazing systems (light shelves and light pipes) were shown to be applicable in skylight designs at full-scale.

  9. Short Communication Electricity generation from fermented primary sludge using single-chamber

    E-Print Network [OSTI]

    as power sources using energy derived in situ from marine sediments (Tender et al., 2002 levels of organics, with $66% of the energy content of the wastewater stored in the primary sludge (Ting and extracting energy from sludge to reduce treatment costs. Useful energy can be cap- tured from organic matter

  10. Feeding large eruptions : crystallisation, mixing and degassing in Icelandic magma chambers 

    E-Print Network [OSTI]

    Passmore, Emma

    Iceland straddles the Mid-Atlantic Ridge and overlies a mantle hotspot. This tectonic setting produces voluminous tholeiitic magmas. Volcanism in Iceland is focussed along three neovolcanic spreading ridges. During the ...

  11. Increasing power generation for scaling up single-chamber air cathode microbial fuel cells

    E-Print Network [OSTI]

    power density was shown to be a linear function of cathode specific surface area (ratio of cathode is the most critical factor for scaling-up MFCs to obtain high power densities. Ó 2010 Elsevier Ltd. All potential as a tech- nology for sustainable bioenergy production due to their ability to generate

  12. Concept for Reducing Hall Thruster Chamber Wall Erosion with Lithium Vapor

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would like submit the followingConcentrating Solar Deployment System (CSDS) - A New ! ! ! ! !

  13. Microsoft PowerPoint - MiniBooNE Air Wire Chamber.ppt

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration wouldMass map shines light on darkMicroorganismsnow widelySmall Ice Crystals duringBARTOSZEK

  14. Some remarks on antenna response in a reverberation chamber - Electromagnetic Compatibility, IEEE Transactions on

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effect Photovoltaics -7541C. Temperature and energySolving theELECTROMAGNETIC

  15. ON THE ANALYSIS OF BUBBLE CHAMBER TRACKS (Technical Report) | SciTech

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report:Speeding accessby aLED Street LightingFromJuneb O S T I Cos AlamosConnect

  16. ON THE ANALYSIS OF BUBBLE CHAMBER TRACKS (Technical Report) | SciTech

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefield MunicipalTechnical Report: AchievementsTemperatures Year 6Report) | SciTech ConnectConnect ON

  17. MHK Technologies/Multi Resonant Chambers MRC 1000 | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIXsource HistoryScenarios Towards 2050Enermar < MHKHydroInformation MultiResonant

  18. Chemical Evolution and Chemical State of the Long Valley Magma Chamber |

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX ECoopButte County,Camilla,Thermal GradientChateau Tebeau LLC Jump to:Consortium

  19. Dark Matter Search Results from the PICO-60 CF$_3$I Bubble Chamber (Journal

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnect Collidertransfer (Journal Article)Journal Article: Dark

  20. Dark Matter Search Results from the PICO-60 CF$_3$I Bubble Chamber (Journal

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfate Reducing BacteriaConnect Collidertransfer (Journal Article)Journal Article: DarkArticle) |

  1. The American Chamber of Commerce of Trinidad & Tobago | Department of

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyThe U.S.Laclede GasEfficiency Maine

  2. U.S. Hispanic Chamber of Commerce Annual Convention & Business Expo |

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirleyEnergyThe U.S.Laclede GasEfficiency|Feed Families"ResearchABU DHABI,toDOE to

  3. PICASSO, COUPP and PICO - Search for dark matter with bubble chambers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTech ConnectSpeeding access to(Conference) |ofPDV workshop(Conference) |

  4. PICASSO, COUPP and PICO - Search for dark matter with bubble chambers

    Office of Scientific and Technical Information (OSTI)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of NaturalDukeWakefieldSulfateSciTech ConnectSpeeding access to(Conference) |ofPDV workshop(Conference) |(Journal Article)

  5. Space Chamber Reaches Cold Target at Unprecedented Efficiency | U.S. DOE

    Office of Science (SC) Website

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power AdministrationRobust,Field-effectWorkingLosThe 26thIWalter H.4Office of Science (SC) Solid-StateOffice of

  6. U.S. Chamber of Commerce Biofuels Dialogue Series: Outlook for an Emerging

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OF APPLICABLEStatutory AuthorityTrack A|Injury at46:EnergyIssuesU.S.

  7. U.S. Chamber of Commerce's 4th Annual North America Forum | Department of

    Energy Savers [EERE]

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QA J-E-1 SECTION J APPENDIX E LIST OF APPLICABLEStatutory AuthorityTrack A|Injury

  8. Minority Chamber of Commerce "How to do Business with Federal

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity of Natural GasAdjustmentsShirley Ann JacksonDepartment ofOffice| DepartmentGJPPGPracticesDraft.doc Moreof% of the

  9. OSTIblog Posts by Kathy Chambers | OSTI, US Dept of Energy, Office of

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantity ofkandz-cm11 Outreach Home Room NewsInformationJesseworkSURVEY UNIVERSEHowScientific and Technical InformationScientific

  10. Los Alamos honored by Española Valley Chamber of Commerce

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Homesum_a_epg0_fpd_mmcf_m.xls" ,"Available from WebQuantityBonneville Power Administration would likeUniverseIMPACTThousand CubicResourcelogo and-EearnstakesLos Alamos exceeds wasteLANL

  11. On the Role of Acoustic-Gravity Waves in the Energetics of the Solar Atmosphere Th. Straus1, B. Fleck2, S.M. Jefferies3, G. Cauzzi4, S.W. McIntosh5, K. Reardon4, G. Severino1, M. Steffen6, T.D. Tarbell7

    E-Print Network [OSTI]

    On the Role of Acoustic-Gravity Waves in the Energetics of the Solar Atmosphere Th. Straus1, B discuss the contribution of acoustic-gravity waves to the energy balance of the photosphere and low-frequency (> 5mHz) acoustic waves by more than an order of magnitude. We compare the properties of high

  12. Tools for a Theoretical X-ray Beamline J. J. Rehr*

    E-Print Network [OSTI]

    Botti, Silvana

    Tools for a Theoretical X-ray Beamline J. J. Rehr* Department of Physics University of Washington, France 22 October 2010 #12;X-ray Spectroscopy Beamline #12;Tools for a Theoretical X-ray Beamline · GOAL Theoretical X-ray Beamline: 2. Tools for EXAFS and XANES, EELS, XMCD, ... 3. DFT/MD-TOOLS 4. Next generation

  13. Magnetic structures of FeTiO{sub 3}-Fe{sub 2}O{sub 3} solid solution thin films studied by soft X-ray magnetic circular dichroism and ab initio multiplet calculations

    SciTech Connect (OSTI)

    Hojo, H. E-mail: fujita@dipole7.kuic.kyoto-u.ac.jp; Fujita, K. E-mail: fujita@dipole7.kuic.kyoto-u.ac.jp; Matoba, T.; Tanaka, K.; Ikeno, H.; Mizoguchi, T.; Tanaka, I.; Nakamura, T.; Takeda, Y.; Okane, T.

    2014-03-17

    The solid solutions between ilmenite (FeTiO{sub 3}) and hematite (?-Fe{sub 2}O{sub 3}) have recently attracted considerable attention as a spintronic material due to their interesting magnetic and electrical properties. In this study, the electronic and magnetic structures of epitaxially grown 0.6FeTiO{sub 3}·0.4Fe{sub 2}O{sub 3} solid solution thin films were investigated by combining x-ray absorption near-edge structure (XANES), x-ray magnetic circular dichroism (XMCD) for two different crystallographic projections, and first-principles theoretical calculations. The Fe L-edge XANES and XMCD spectra reveal that Fe is in the mixed-valent Fe{sup 2+}–Fe{sup 3+} states while Fe{sup 2+} ions are mainly responsible for the magnetization. Moreover, the experimental Fe L-edge XANES and XMCD spectra change depending on the incident x-ray directions, and the theoretical spectra explain such spectral features. We also find a large orbital magnetic moment, which can originate the magnetic anisotropy of this system. On the other hand, although the valence state of Ti was interpreted to be 4+ from the Ti L-edge XANES, XMCD signals indicate that some electrons are present in the Ti-3d orbital, which are coupled antiparallel to the magnetic moment of Fe{sup 2+} ions.

  14. Ground-state wave function of plutonium in PuSb as determined via x-ray magnetic circular dichroism

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

    Janoschek, M.; Haskel, D.; Fernandez-Rodriguez, J.; van Veenendaal, M.; Rebizant, J.; Lander, G. H.; Zhu, J. -X.; Thompson, J. D.; Bauer, E. D.

    2015-01-14

    Measurements of x-ray magnetic circular dichroism (XMCD) and x-ray absorption near-edge structure (XANES) spectroscopy at the Pu M?,? edges of the ferromagnet PuSb are reported. Using bulk magnetization measurements and a sum rule analysis of the XMCD spectra, we determine the individual orbital [?L = 2.8(1)?B/Pu] and spin moments [?S = –2.0(1)?B/Pu] of the Pu 5f electrons for the first time. Atomic multiplet calculations of the XMCD and XANES spectra reproduce well the experimental data and are consistent with the experimental value of the spin moment. These measurements of Lz and Sz are in excellent agreement with the values thatmore »have been extracted from neutron magnetic form factor measurements, and confirm the local character of the 5f electrons in PuSb. We demonstrate that a split M? as well as a narrow M? XMCD signal may serve as a signature of 5f electron localization in actinide compounds.« less

  15. ccsd-00068523,version1-12May2006 APS/123-QED Structural and magnetic properties of CoPt mixed clusters.

    E-Print Network [OSTI]

    Boyer, Edmond

    , France S. Stanescu ESRF, BP 220, F-38043 Grenoble ,France T. Epicier Groupe d'´Etude de M´etallurgie 5614 CNRS/INPG/UJF, BP 75, 38402 Saint Martin D'Heres Cedex, France D. Babonneau Laboratoire de M´etallurgie and X-Ray Magnetic Circular Dichro¨ism (XMCD). Magnetization and blocking temperature are weaker

  16. Itinerant ferromagnetism in the As 4p conduction band of Ba0.6K0.4Mn2As2 identified by x-ray magnetic circular dichroism

    SciTech Connect (OSTI)

    Ueland, B. G.; Pandey, Abhishek; Lee, Y.; Sapkota, A.; Choi, Y.; Haskel, D.; Rosenberg, R. A.; Lang, J. C.; Harmon, B. N.; Johnston, D. C.; Kreyssig, A.; Goldman, A. I.

    2015-05-27

    In this study, x-ray magnetic circular dichroism (XMCD) measurements on single-crystal and powder samples of Ba0.6K0.4Mn2As2 show that the ferromagnetism below TC ? 100 K arises in the As 4p conduction band. No XMCD signal is observed at the Mn x-ray absorption edges. Below TC, however, a clear XMCD signal is found at the As K edge which increases with decreasing temperature. The XMCD signal is absent in data taken with the beam directed parallel to the crystallographic c axis indicating that the orbital magnetic moment lies in the basal plane of the tetragonal lattice. These results show that the previously reported itinerant ferromagnetism is associated with the As 4p conduction band and that distinct local-moment antiferromagnetism and itinerant ferromagnetism with perpendicular easy axes coexist in this compound at low temperature.

  17. Ground-state wave function of plutonium in PuSb as determined via x-ray magnetic circular dichroism

    SciTech Connect (OSTI)

    Janoschek, M.; Haskel, D.; Fernandez-Rodriguez, J.; van Veenendaal, M.; Rebizant, J.; Lander, G. H.; Zhu, J. -X.; Thompson, J. D.; Bauer, E. D.

    2015-01-01

    Measurements of x-ray magnetic circular dichroism (XMCD) and x-ray absorption near-edge structure (XANES) spectroscopy at the Pu M?,? edges of the ferromagnet PuSb are reported. Using bulk magnetization measurements and a sum rule analysis of the XMCD spectra, we determine the individual orbital [?L = 2.8(1)?B/Pu] and spin moments [?S = ?2.0(1)?B/Pu] of the Pu 5f electrons for the first time. Atomic multiplet calculations of the XMCD and XANES spectra reproduce well the experimental data and are consistent with the experimental value of the spin moment. These measurements of ?Lz? and ?Sz? are in excellent agreement with the values that have been extracted from neutron magnetic form factor measurements, and confirm the local character of the 5f electrons in PuSb. Finally, we demonstrate that a split M? as well as a narrow M? XMCD signal may serve as a signature of 5f electron localization in actinide compounds.

  18. Observations of Secondary Organic Aerosol Production and Soot Aging under Atmospheric Conditions Using a Novel Environmental Aerosol Chamber 

    E-Print Network [OSTI]

    Glen, Crystal

    2012-02-14

    of the processes leading to SOA production under ambient gaseous and particulate concentrations as well as the impact these aerosol types have on climate is poorly understood. Although the majority of atmospheric aerosols scatter radiation either directly...

  19. Liquid Metal Jet into a High Magnetic Field 1 Figure 1: Left: jet chamber; right: schematic setup

    E-Print Network [OSTI]

    McDonald, Kirk

    Liquid Metal Jet into a High Magnetic Field 1 M9 bore z [cm] 20 70 0 valve z nozzle drift opt#ectively prevents any mercury leakage. The 20 data sets recorded during the third day contains su#cient information

  20. Aquatic respiration in many fishes is a mechanical ballet in which water is pumped from the oropharyngeal chamber,

    E-Print Network [OSTI]

    Summers, Adam P.

    of discontinuous flow into the mouth and out of the gill slit(s). The blood flow in the respiratory structures of the branchial skeleton and small muscles that extend the elements of the gill arch may be responsible (Hughes) in through the mouth + spiracle, (3) in through the mouth only, and (4) the mouth held open throughout

  1. Balancing particle absorption with structural support of the muon beam stop in muons-to-electrons experimental chamber

    SciTech Connect (OSTI)

    Majewski, Ryan

    2013-01-01

    The Mu2e experiment at Fermi National Accelerator Laboratory is seeking a full conversion from muon to electron. The design for Mu2e is based off MECO, another proposed experiment that sought a full conversion from muon to electron at Brookhaven National Laboratory in the 1990s. Mu2e will provide sensitivity that is four times the sensitivity of the previous experiment, SINDRUM II. Discovering muon to electron conversions could help explain physics beyond the standard model of the particle physics.

  2. Microfluidic Brain Slice Chambers and Flexible Microelectrode Arrays for in vitro Localized Stimulation and Spatial Mapping of Neural Activities

    E-Print Network [OSTI]

    Tang, Yujie

    2012-01-01

    in elasmobranch cerebellum. Brain Research. 199:113– Zadorin extracellular space deep in brain. The FASEB journal?:perfusion system for thick brain slice cultures. Biomedical

  3. 1 IAEA-CN-94/FT/1-3Ra Addressing Key Science and Technology Issues for IFE Chambers,

    E-Print Network [OSTI]

    Najmabadi, Farrokh

    , New Mexico 87545 USA 4) University of Wisconsin (UW), Madison, Wisconsin 53706 USA 5) University considerations (such as beam propagation and target survival during injection) impact design choices. 1 including radiation protection for the final focus magnets [7]. LLNL also conducts safety and environmental

  4. Characteristics of the upper crust and magma chambers along the spreading centers of the Lau back-arc basin

    E-Print Network [OSTI]

    Dingler, Allison Maria Jacobs

    2007-01-01

    locations we create a vehicle to quickly recognize potential geo-hazardouslocation of the 25 most populated cities in the world, we can identify the most potentially geo-hazardous

  5. UCRL-JC-138507 Overview of IFE Chamber and Target Technologies R&D in the U.S.

    E-Print Network [OSTI]

    Tillack, Mark

    energy power plants. The scope of the inertial fusion energy (IFE) element of the VLT includes the fusion addressing these critical issues. 1. Introduction Previous IFE power plant conceptual design studies Science (OFES) formed the Virtual Laboratory for Technology (VLT) to develop the technologies needed

  6. Progress and Critical Issues for IFE Blanket and Chamber Research (ISFNT-5 invited paper, 8 page total length)

    E-Print Network [OSTI]

    Tillack, Mark

    auspices of US Department of Energy by Lawrence Livermore National Laboratory under contract W-7405-Eng-48 total length) B. Grant Logan Lawrence Livermore National Laboratory* PO Box 808, Livermore, CA, USA Laboratory* Livermore, CA, USA Ralph W. Moir Lawrence Livermore National Laboratory* Livermore, CA, USA

  7. Microfluidic Brain Slice Chambers and Flexible Microelectrode Arrays for in vitro Localized Stimulation and Spatial Mapping of Neural Activities

    E-Print Network [OSTI]

    Tang, Yujie

    2012-01-01

    device and fMEA. 78 Figure 5.5:signal coincides with fMEA signal. 82 Figure 5.7: Slow5.2.1 Planar Flexible MEA (fMEA) Design and Fabrication The

  8. Extension of the stability of motions in a combustion chamber by non- linear active control based on hysteresis

    SciTech Connect (OSTI)

    Knoop, P.; Culick, F.E.C.; Zukoski, E.E.

    1996-07-01

    This report presents the first quantitative data establishing the details of hysteresis whose existence in dynamical behavior was reported by Sterling and Zukoski. The new idea was demonstrated that the presence of dynamical hysteresis provides opportunity for a novel strategy of active nonlinear control of unsteady motions in combustors. A figure shows the hysteresis exhibited for the amplitude of pressure oscillations as a function of equivalence ratio in a combustor having a recirculation zone, in this case a dump combustor.

  9. Microfluidic Brain Slice Chambers and Flexible Microelectrode Arrays for in vitro Localized Stimulation and Spatial Mapping of Neural Activities

    E-Print Network [OSTI]

    Tang, Yujie

    2012-01-01

    in biocompatible flexible electronics. To record corticalthat is suitable for flexible electronics interconnects(KimThe marriage of flexible electronics and 3D low impedance

  10. ly). Samples were incubated in a buffer-equilibrated humidity chamber at 46C for 90 min, then rinsed

    E-Print Network [OSTI]

    Braun, Douglas C.

    ., J. Bacteriol. 177, 7050 (1995). 20. C. Schleper, G. Puehler, H. P. Klenk, W. Zillig, Int. J. Syst

  11. Microfluidic Brain Slice Chambers and Flexible Microelectrode Arrays for in vitro Localized Stimulation and Spatial Mapping of Neural Activities

    E-Print Network [OSTI]

    Tang, Yujie

    2012-01-01

    Kim B, Raupp G. 2004. Polyimide-based intracortical neuralFabrication and testing of polyimide-based microelectrodehave been used such as polyimide, parylene, etc (Lee et al.

  12. DESIGN, FABRICATION AND BENCH TESTNG OF A TEXACO INFRARED RATIO PYROMETER SYSTEM FOR THE MEASUREMENT OF GASIFIER REACTION CHAMBER TEMPERATURE

    SciTech Connect (OSTI)

    Thomas F. Leininger; Hua-Min Huang

    2003-04-01

    The cooperative agreement between Texaco and Polk Power has been revised by Polk Power and ChevronTexaco several times already. Lawyers from both Polk Power and ChevronTexaco are in the process to include the issues related to the ownership transfer of the Texaco gasification unit in the agreement and finalize the draft. The modification fieldwork and testing will start once the cooperative agreement is signed with Polk Power.

  13. An Archaeological Survey for the CGG Veritas Middleton Ranch 3-D Seismic Survey in Chambers County Texas 

    E-Print Network [OSTI]

    Moore, William; Baxter, Edward

    2015-07-31

    1988 The Crawford Site, 41PK69, Central Trinity River Uplands, Polk County, Texas. Contract Reports in Archaeology Number 4, Highway Design Division, Texas State Department of Highways and Public Transportation, Austin. 1989 Alabonson Road: Early...

  14. DESIGN, FABRICATION AND BENCH TESTING OF A TEXACO INFRARED RATIO PYROMETER SYSTEM FOR THE MEASUREMENT OF GASIFIER REACTION CHAMBER TEMPERATURE

    SciTech Connect (OSTI)

    Thomas F. Leininger; Hua-Min Huang

    2004-01-01

    ChevronTexaco has shipped the pyrometer system to Tampa, Florida. Polk Power is in the process of installing the mechanical, electrical and instrumentation of the pyrometer system as well as integrating the instrumentation to the test site Distributed Control System. The startup and field testing of the system will begin afterwards.

  15. DESIGN, FABRICATION AND BENCH TESTING OF A TEXACO INFRARED RATIO PYROMETER SYSTEM FOR THE MEASUREMENT OF GASIFIER REACTION CHAMBER TEMPERATURE

    SciTech Connect (OSTI)

    Thomas F. Leininger; Hua-Min Huang

    2003-10-01

    Polk Power and ChevronTexaco have signed the cooperative agreement at the end of reporting period. ChevronTexaco is shipping the pyrometer system to Tampa, Florida. Polk Power will start the modification fieldwork and installation of the system. The testing will start when the next opportunity is available.

  16. DESIGN, FABRICATION AND BENCH TESTING OF A TEXACO INFRARED RATIO PYROMETER SYSTEM FOR THE MEASUREMENT OF GASIFIER REACTION CHAMBER TEMPERATURE

    SciTech Connect (OSTI)

    Thomas F. Leininger; Hua-Min Huang

    2003-07-01

    Polk Power has decided that the Texaco gasification unit will not be sold to a third party. Therefore, including the ownership transfer of the Texaco gasification unit in the agreement is not an issue any more. The cooperative agreement between Texaco and Polk Power has been revised several times in this quarter. Polk power is making comments on the last draft that Texaco sent to them. The modification fieldwork and testing will start once the cooperative agreement is signed with Polk Power.

  17. The earliest history of the Skaergaard magma chamber: a textural and geochemical study of the Cambridge Drill Core

    E-Print Network [OSTI]

    Holness, Marian B.; Tegner, Christian; Namur, Olivier; Pilbeam, Llewellyn

    2015-01-01

    The Cambridge Drill Core provides a continuous sample of the lower part of the floor cumulates of the Skaergaard Intrusion, including ~150 m of stratigraphy from the unexposed Hidden Zone. Bulk rock geochemistry, together with olivine mineral...

  18. Crimes against Humanity at the Extraordinary Chambers in the Courts of Cambodia: Is a Connection with Armed Conflict Required?

    E-Print Network [OSTI]

    Ford, Stuart

    2007-01-01

    37 (Mauritania); id. 41 (Mali); U.N. GAOR, 3rd Comm. , 23rddefinition); id. 41 (Mali) (finding the "text of article Iment were India, Kuwait, Mali, Senegal, the United Arab

  19. Synchronized monochromator and insertion device energy scans at SLS

    SciTech Connect (OSTI)

    Krempasky, J.; Flechsig, U.; Korhonen, T.; Zimoch, D.; Quitmann, Ch.; Nolting, F.

    2010-06-23

    Synchronous monochromator and insertion device energy scans were implemented at the Surfaces/Interfaces:Microscopy (SIM) beamline in order to provide the users fast X-ray magnetic dichroism studies (XMCD). A simple software control scheme is proposed based on a fast monochromator run-time energy readback which quickly updates the insertion device requested energy during an on-the-fly X-ray absorption scan (XAS). In this scheme the Plain Grating Monochromator (PGM) motion control, being much slower compared with the insertion device (APPLE-II type undulator), acts as a 'master' controlling the undulator 'slave' energy position. This master-slave software implementation exploits EPICS distributed device control over computer network and allows for a quasi-synchronous motion control combined with data acquisition needed for the XAS or XMCD experiment.

  20. Disentangling the Mn moments on different sublattices in the half-metallic ferrimagnet Mn3?xCoxGa

    SciTech Connect (OSTI)

    Klaer, P.; Jenkins, C.A.; Alijani, V.; Winterlik, J.; Balke, B.; Felser, C.; Elmers, H.J.

    2011-05-03

    Ferrimagnetic Mn{sub 3-x}Co{sub x}Ga compounds have been investigated by magnetic circular dichroism in x-ray absorption (XMCD). Compounds with x > 0.5 crystallize in the CuHg{sub 2}Ti structure. A tetragonal distortion of the cubic structure occurs for x {le} 0.5. For the cubic phase, magnetometry reveals a linearly increasing magnetization of 2x Bohr magnetons per formula unit obeying the generalized Slater-Pauling rule. XMCD confirms the ferrimagnetic character with Mn atoms occupying two different sublattices with antiparallel spin orientation and different degrees of spin localization and identifies the region 0.6 < x {le} 0.8 as most promising for a high spin polarization at the Fermi level. Individual Mn moments on inequivalent sites are compared to theoretical predictions.

  1. Depth-dependent magnetism in epitaxial MnSb thin films: effects of surface passivation and cleaning

    SciTech Connect (OSTI)

    Aldous J. D.; Sanchez-Hanke C.; Burrows, C.W.; Maskery, I.; Brewer, M.S.; Hase, T.P.A.; Duffy, J.A.; Lees, M. Rs; Decoster, T.; Theis, W.; Quesada, A.; Schmid, A.K.; Bell, G.R.

    2012-03-15

    Depth-dependent magnetism in MnSb(0001) epitaxial films has been studied by combining experimental methods with different surface specificities: polarized neutron reflectivity, x-ray magnetic circular dichroism (XMCD), x-ray resonant magnetic scattering and spin-polarized low energy electron microscopy (SPLEEM). A native oxide {approx}4.5 nm thick covers air-exposed samples which increases the film's coercivity. HCl etching efficiently removes this oxide and in situ surface treatment of etched samples enables surface magnetic contrast to be observed in SPLEEM. A thin Sb capping layer prevents oxidation and preserves ferromagnetism throughout the MnSb film. The interpretation of Mn L{sub 3,2} edge XMCD data is discussed.

  2. Determination of the Fe magnetic anisotropies and the CoO frozen spins in epitaxial CoO/Fe/Ag(001)

    SciTech Connect (OSTI)

    Meng, J. Li, Y.; Park, J. S.; Jenkins, C. A.; Arenholz, E.; Scholl, A.; Tan, A.; Son, H.; Zhao, H. W.; Hwang, Chanyong; Qiu, Z. Q.

    2011-04-28

    CoO/Fe/Ag(001) films were grown epitaxially and studied by X-ray Magnetic Circular Dichroism (XMCD) and X-ray Magnetic Linear Dichroism (XMLD). After field cooling along the Fe[100] axis to 80 K, exchange bias, uniaxial anisotropy, and 4-fold anisotropy of the films were determined by hysteresis loop and XMCD measurements by rotating the Fe magnetization within the film plane. The CoO frozen spins were determined by XMLD measurement as a function of CoO thickness.We find that among the exchange bias, uniaxial anisotropy, and 4-fold anisotropy, only the uniaxial magnetic anisotropy follows thickness dependence of the CoO frozen spins.

  3. The influence of Nd dopants on spin and orbital moments in Nd-doped permalloy thin films

    SciTech Connect (OSTI)

    Luo, Chen Zhang, Wen E-mail: yazhai@seu.edu.cn; Zhai, Ya E-mail: yazhai@seu.edu.cn; Wong, P. K. J.; You, Biao; Du, Jun; Zhai, Hongru

    2014-08-25

    Magnetic properties of Nd{sub X}-Ni{sub 80}Fe{sub 20(1?X)} thin films have been investigated using x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) at room temperature. With the Nd concentration increasing, the ratio of orbital-to-spin moment of Ni and Fe increases significantly, indicating that the spin-orbit coupling in permalloy thin films is enhanced due to the Nd impurities. The spin and orbital moments have been obtained by the sum rules analysis, which shows that the Nd impurities lead to a strong dispersion of spin moments of Fe and Ni while have no effect on orbital moments in Nd-doped permalloy thin films. Element-specific XMCD hysteresis loops suggest an antiferromagnetic coupling between the magnetic moments of Nd and permalloy at room temperature. The static magnetic properties have been studied by vibrating sample magnetometer for comparison, which shows a nice agreement with the XMCD results.

  4. Tritium Detection Methods and Limitations

    Office of Environmental Management (EM)

    NY (1994). ION CHAMBER DETECTORS * PORTABLE ION CHAMBERS * AREA (ROOM) ION CHAMBERS * EFFLUENT (STACK) ION CHAMBERS PORTABLE ION CHAMBERS 200 to 400 cc active volume 5 to 10 uCim3...

  5. So We Will Never Forget: A Population-Based Survey On Attitudes About Social Reconstruction and the Extraordinary Chambers in the Courts of Cambodia

    E-Print Network [OSTI]

    Pham, Phuong N; Vinck, Patrick; Hean, Sokhom; Stover, Eric

    2009-01-01

    expunging criminal records, issuing declarations of death,remembrance, expunging criminal records, exhuming bod- ies,expunging criminal records, issuing declarations of death,

  6. An Aging Study of a Gas Electron Multiplier with Micro-Strip Gas Chamber Readout J. Miyamoto and I.P.J Shipsey

    E-Print Network [OSTI]

    ]. At high energy colliders and in certain imaging applications the MSGC is exposed to large radiation doses of intense research, in particular for use as a precision tracker for high rate particle physics experiments]. Aging studies are performed in the laboratory using low energy X-ray beams. However, the conditions

  7. Evacuated optical structure comprising optical bench mounted to sidewall of vacuum chamber in a manner which inhibits deflection and rotation of the optical bench

    DOE Patents [OSTI]

    Bowers, Joel M. (Livermore, CA)

    1994-01-01

    An improved evacuated optical structure is disclosed comprising an optical bench mounted in a vacuum vessel in a manner which inhibits transmission of movement of the vacuum vessel to the optical bench, yet provides a compact and economical structure. The vacuum vessel is mounted, through a sidewall thereof, to a support wall at four symmetrically positioned and spaced apart areas, each of which comprises a symmetrically positioned group of mounting structures passing through the sidewall of the vacuum vessel. The optical bench is pivotally secured to the vacuum vessel by four symmetrically spaced apart bolts and spherical bearings, each of which is centrally positioned within one of the four symmetrically positioned groups of vacuum vessel mounting structures. Cover plates and o-ring seals are further provided to seal the vacuum vessel mounting structures from the interior of the vacuum vessel, and venting bores are provided to vent trapped gases in the bores used to secure the cover plates and o-rings to the vacuum vessel. Provision for detecting leaks in the mounting structures from the rear surface of the vacuum vessel sidewall facing the support wall are also provided. Deflection to the optical bench within the vacuum vessel is further minimized by tuning the structure for a resonant frequency of at least 100 Hertz.

  8. Nuclear Instruments and Methods in Physics Research A 578 (2007) 409420 A liquid xenon ionization chamber in an all-fluoropolymer vessel

    E-Print Network [OSTI]

    Piepke, Andreas G.

    2007-01-01

    , CA, USA b Applied Plastics Technology, Inc., Bristol, RI, USA c Institut de Physique, Universite´ de; Fluoropolymer; Double beta decay; Xenon; EXO; Low background 1. Introduction For over a decade, plastics have that involve efficient chemical separation stages, selected plastics have generally shown very low levels

  9. NUCLEAR INSTRUMENTS AND METHODS 156 (1978) 159-162 ; NORTH-HOLLAND PUBLISHING CO. DRIFT CHAMBER PERFORMANCE IN A STRONG MAGNETIC FIELD

    E-Print Network [OSTI]

    McDonald, Kirk

    1978-01-01

    (ISABELLE, Energy Doubler/Saver, VBA, etc.) opens new regions of available energy and particle momenta to 5500 V/cm and 4.5 T have been studied. 1. Introduction The next generation of high energy accelerators

  10. First Characterization of the Ultra-Shielded Chamber in the Low-noise Underground Laboratory (LSBB) of Rustrel Pays d'Apt

    E-Print Network [OSTI]

    G. Waysand; D. Bloyet; J. P. Bongiraud; J. I. Collar; C. Dolabdjian; Ph. Le Thiec

    1999-10-13

    In compliance with international agreements on nuclear weapons limitation, the French ground-based nuclear arsenal has been decommissioned in its totality. One of its former underground missile control centers, located in Rustrel, 60 km east of Avignon (Provence) has been converted into the ``Laboratoire Souterrain \\`a Bas Bruit de Rustrel-Pays d'Apt'' (LSBB). The deepest experimental hall (500 m of calcite rock overburden) includes a 100 m$^{2}$ area of sturdy flooring suspended by and resting on shock absorbers, entirely enclosed in a 28 m-long, 8 m-diameter, 1 cm-thick steel Faraday cage. This results in an unparalleled combination of shielding against cosmic rays, acoustic, seismic and electromagnetic noise, which can be exploited for rare event searches using ultra low-temperature and superconducting detectors. The first characterization measurements in this unique civilian site are reported. For more info see http://home.cern.ch/collar/RUSTREL/rustrel.html

  11. IEEE TnacZtion.6 on Nucteaw Science, Vot.NS-25, No.1, FebuwAy 1978 DRIFT CHAMBER PERFORMANCE IN THE FIELD OF A SUPERCONDUCTING

    E-Print Network [OSTI]

    McDonald, Kirk

    in magnetic fields up to 6 tesla. The angle of the electron drift has been measured as a function of electric and magnet- ic field intensity. I. Introduction The next generation of high energy accelerators (ISABELLE performance in magnetic fields up to 1.6 tesla. They have shown that by appro- priately tilting the electric

  12. Evacuated optical structure comprising optical bench mounted to sidewall of vacuum chamber in a manner which inhibits deflection and rotation of the optical bench

    DOE Patents [OSTI]

    Bowers, J.M.

    1994-04-19

    An improved evacuated optical structure is disclosed comprising an optical bench mounted in a vacuum vessel in a manner which inhibits transmission of movement of the vacuum vessel to the optical bench, yet provides a compact and economical structure. The vacuum vessel is mounted, through a sidewall thereof, to a support wall at four symmetrically positioned and spaced apart areas, each of which comprises a symmetrically positioned group of mounting structures passing through the sidewall of the vacuum vessel. The optical bench is pivotally secured to the vacuum vessel by four symmetrically spaced apart bolts and spherical bearings, each of which is centrally positioned within one of the four symmetrically positioned groups of vacuum vessel mounting structures. Cover plates and o-ring seals are further provided to seal the vacuum vessel mounting structures from the interior of the vacuum vessel, and venting bores are provided to vent trapped gases in the bores used to secure the cover plates and o-rings to the vacuum vessel. Provision for detecting leaks in the mounting structures from the rear surface of the vacuum vessel sidewall facing the support wall are also provided. Deflection to the optical bench within the vacuum vessel is further minimized by tuning the structure for a resonant frequency of at least 100 Hertz. 10 figures.

  13. Soybean leaf hydraulic conductance does not acclimate to growth at elevated [CO2] or temperature in growth chambers or in the field

    E-Print Network [OSTI]

    Sack, Lawren

    Soybean leaf hydraulic conductance does not acclimate to growth at elevated [CO2] or temperature Leaf hydraulic properties are strongly linked with transpiration and photosynthesis in many species. However, it is not known if gas exchange and hydraulics will have co-ordinated responsesto climate change

  14. A new, very massive modular Liquid Argon Imaging Chamber to detect low energy off-axis neutrinos from the CNGS beam. (Project MODULAr)

    E-Print Network [OSTI]

    Baibussinov, B; Battistoni, G; Benetti, P; Borio, A; Calligarich, E; Cambiaghi, M; Cavanna, F; Centro, Sandro; Cocco, A G; Dolfini, R; Berzolari, A Gigli; Farnese, C; Fava, A; Ferrari, A; Fiorillo, G; Gibin, D; Guglielmi, A M; Mannocchi, G; Mauri, F; Menegolli, A; Meng, G; Montanari, C; Palamara, O; Periale, L; Piazzoli, A; Picchi, P; Pietropaolo, F; Rappoldi, A; Raselli, G L; Rubbia, Carlo; Sala, P; Satta, G; Varanini, F; Ventura, Sandro; Vignoli, C

    2007-01-01

    The paper is considering an opportunity for the CERN/GranSasso (CNGS) neutrino complex, concurrent time-wise with T2K and NOvA, to search for theta_13 oscillations and CP violation. Compared with large water Cherenkov (T2K) and fine grained scintillators (NOvA), the LAr-TPC offers a higher detection efficiency and a lower backgrounds, since virtually all channels may be unambiguously recognized. The present proposal, called MODULAr, describes a 20 kt fiducial volume LAr-TPC, following very closely the technology developed for the ICARUS-T60o, and is focused on the following activities, for which we seek an extended international collaboration: (1) the neutrino beam from the CERN 400 GeV proton beam and an optimised horn focussing, eventually with an increased intensity in the framework of the LHC accelerator improvement program; (2) A new experimental area LNGS-B, of at least 50000 m3 at 10 km off-axis from the main Laboratory, eventually upgradable to larger sizes. A location is under consideration at about ...

  15. Proposal for a Full-Scale Prototype Single-Phase Liquid Argon Time Projection Chamber and Detector Beam Test at CERN

    E-Print Network [OSTI]

    Kutter, T

    2015-01-01

    The Deep Underground Neutrino Experiment (DUNE) will use a large liquid argon (LAr) detector to measure the CP violating phase, determine the neutrino mass hier- archy and perform precision tests of the three-flavor paradigm in long-baseline neutrino oscillations. The detector will consist of four modules each with a fiducial mass of 10 kt of LAr and due to its unprecedented size will allow sensitive searches for proton decay and the detection and measurement of electron neutrinos from core collapse supernovae [1]. The first 10 kt module will use single-phase LAr detection technique and be itself modular in design. The successful manufacturing, installation and operation of several full-scale detector components in a suitable configuration represents a critical engineering milestone prior to the construction and operation of the first full 10 kt DUNE detector module at the SURF underground site. A charged particle beam test of a prototype detector will provide critical calibration measurements as well as inva...

  16. In-Jet Tracking Efficiency Analysis for the STAR Time Projection Chamber in Polarized Proton-Proton Collisions at sqrt(s) = 200GeV 

    E-Print Network [OSTI]

    Huo, Liaoyuan

    2012-07-16

    in polarized proton-proton collision experiments. TPC's in-jet tracking efficiency represents the largest systematic uncertainty on jet energy scale at high transverse momentum, whose measurement contributes to the understanding of the spin structure of protons...

  17. An assessment of the sensitivity of a low pressure time projection chamber to the direction of WIMP-induced nuclear recoils/

    E-Print Network [OSTI]

    Henderson, Shawn Wesley

    2013-01-01

    Direct directional detection of dark matter could provide an unambiguous observation of dark matter due to the predicted directional anisotropy of dark matter particles in the galactic reference frame. The Dark Matter Time ...

  18. Application of the time-dependent charge asymmetry method for longitudinal position determination in prototype proportional chambers for the PANDA experiment

    E-Print Network [OSTI]

    Andrey Sokolov; James Ritman; Peter Wintz

    2007-02-07

    The PANDA collaboration intends to build a state-of-the-art detector to study the physics of antiproton annihilation in the charm mass region at the future FAIR facility at GSI, Darmstadt. One major part of the PANDA detector is the straw tube tracker. It will consist of about 6000 individual straws grouped in 11 double layers and filled with an Ar+10%CO_2 gas mixture. The required radial spatial resolution is about 150 micron. Two different methods are considered for longitudinal coordinate measurements - skewed double layers and a novel method based on the time-dependent charge asymmetry. The latter method is presented in this article.

  19. The Political Strategies of Tiwanaku Leaders in Moquegua, Peru : : An Analysis of Tiwanaku Priests and the Inner Chambers of the Omo Temple

    E-Print Network [OSTI]

    Kjolsing, Jason Michael

    2013-01-01

    Archaeology and Paleoecology of an Andean Civilization,Archaeology and Paleoecology of an Andean Civilization,Archaeology and Paleoecology of an Andean Civilization,

  20. Complete fabrication of target experimental chamber and implement initial target diagnostics to be used for the first target experiments in NDCX-1

    E-Print Network [OSTI]

    Bieniosek, F.M.

    2008-01-01

    kinematic manipulator", or hexapod. As a future developmenttarget alignment a miniature hexapod will sit on the end ofwith a manually adjustable hexapod on top as shown in Fig.

  1. The design, construction, and instrumentation of a chamber to study heat, mass, and momentum transfer from humid air to metal under conditions of frosting and free convection 

    E-Print Network [OSTI]

    Hutchison, James P

    1961-01-01

    THE DESIGN? CONSTRUCTION? AND INSTRUMENTATION OF A CEAMSER TO STUDY HEAT, MASS? AND MOSNTUM TRANSFER FROM HUMID AIR TO METAL UNDER CONDITIONS OF FROSTING AND FREE CONVECTION A Thesis By James P. Hutchison Submitted to the Graduate School..., AND MOMENTUM TRANSFER FROM HUMID AIR TO METAL UNDER CONDITIONS OF FROSTING AND FREE CONVECTION A Thesis By James P. Hutchison Approved as to Style and Content: Chairman of Committee Head of Departm t + gkA4; August 1961 ACKNOWLEDGEMENT S The writer...

  2. Charged particle spectra in [sup 32]S + [sup 32]S interactions at 200 GeV/nucleon from CCD-imaged nuclear collisions in a streamer chamber

    SciTech Connect (OSTI)

    Teitelbaum, L.P.

    1992-04-01

    We have measured the transverse momentum spectra 1/p[sub T] dN/dp[sub T] and rapidity distributions dN/dy of negatively charged hadrons and protons for central [sup 32]S + [sup 32]S interactions at 200 GeV/nucleon incident energy. The negative hadron dN/dy distribution is too broad to be accounted for by thermal models which demand isotropic particle emission. It is compatible with models which emphasize longitudinal dynamics, by either a particle production mechanism, as in the Lund fragmentation model, or by introducing one-dimensional hydrodynamic expansion, as in the Landau model. The proton dN/dy distribution, although showing no evidence for a peak in the target fragmentation region, exhibits limited nuclear stopping power. We estimate the mean rapidity shift of participant target protons to be [Delta]y [approximately] 1.5, greater than observed for pp collisions, less than measured in central pA collisions, and much less than would be observed for a single equilibrated fireball at midrapidity. Both the negative hadron and proton dN/dy distributions can be fit by a symmetric Landau two-fireball model. Although the spectrum possesses a two-component structure, a comparison to pp data at comparable center-of-mass energy shows no evidence for enhanced production at low p[sub T]. The two-component structure can be explained by a thermal and chemical equilibrium model which takes into account the kinematics of resonance decay. Using an expression motivated by longitudinal expansion we find the same temperature for both the protons and negative hadrons at freezeout, T[sub f] [approximately] 170 MeV. We conclude that the charged particle spectra of negative hadrons and protons can be accommodated in a simple collision picture of limited nuclear stopping, evolution through a state of thermal equilibrium, followed by longitudinal hydrodynamic expansion until freezeout.

  3. Charged particle spectra in {sup 32}S + {sup 32}S interactions at 200 GeV/nucleon from CCD-imaged nuclear collisions in a streamer chamber

    SciTech Connect (OSTI)

    Teitelbaum, L.P.

    1992-04-01

    We have measured the transverse momentum spectra 1/p{sub T} dN/dp{sub T} and rapidity distributions dN/dy of negatively charged hadrons and protons for central {sup 32}S + {sup 32}S interactions at 200 GeV/nucleon incident energy. The negative hadron dN/dy distribution is too broad to be accounted for by thermal models which demand isotropic particle emission. It is compatible with models which emphasize longitudinal dynamics, by either a particle production mechanism, as in the Lund fragmentation model, or by introducing one-dimensional hydrodynamic expansion, as in the Landau model. The proton dN/dy distribution, although showing no evidence for a peak in the target fragmentation region, exhibits limited nuclear stopping power. We estimate the mean rapidity shift of participant target protons to be {Delta}y {approximately} 1.5, greater than observed for pp collisions, less than measured in central pA collisions, and much less than would be observed for a single equilibrated fireball at midrapidity. Both the negative hadron and proton dN/dy distributions can be fit by a symmetric Landau two-fireball model. Although the spectrum possesses a two-component structure, a comparison to pp data at comparable center-of-mass energy shows no evidence for enhanced production at low p{sub T}. The two-component structure can be explained by a thermal and chemical equilibrium model which takes into account the kinematics of resonance decay. Using an expression motivated by longitudinal expansion we find the same temperature for both the protons and negative hadrons at freezeout, T{sub f} {approximately} 170 MeV. We conclude that the charged particle spectra of negative hadrons and protons can be accommodated in a simple collision picture of limited nuclear stopping, evolution through a state of thermal equilibrium, followed by longitudinal hydrodynamic expansion until freezeout.

  4. La Scala Chamber Orchestra Performs "Fantasies from Verdi's Operas" A special concert at MIT celebrates the renewal of the research collaboration with Eni

    E-Print Network [OSTI]

    celebrates the renewal of the research collaboration with Eni "Let's give energy a new energy" Cambridge (MA's Operas". The concert, presented by Eni and MIT, celebrates the renewal of the research collaboration which aims to achieve the key message: "Let's give energy a new energy." For Eni's Chairman Giuseppe

  5. Low energy tracking and particles identification in the MUNU Time Projection Chamber at 1 bar. Possible application in low energy solar neutrino spectroscopy

    E-Print Network [OSTI]

    Z. Daraktchieva; C. Amsler; M. Avenier; C. Broggini; J. Busto; C. Cerna; F. Juget; D. H. Koang; J. Lamblin; D. Lebrun; O. Link; G. Puglierin; A. Stutz; A. Tadsen; J. -L. Vuilleumier; J. -M. Vuilleumier; V. Zacek

    2007-11-02

    In this paper we present the results from the measurements made with the MUNU TPC at 1bar pressure of CF4 in the energy region below 1 MeV. Electron events down to 80 keV are successfully measured. The electron energy and direction are reconstructed for every contained single electron above 200 keV. As test the 137Cs photopeak is reconstructed by measuring both the energy and direction of the Compton electrons in the TPC.

  6. The use of nylon and glass fiber filter separators with different pore sizes in air-cathode single-chamber microbial fuel cells

    E-Print Network [OSTI]

    increase both power density and Coulombic efficiency (CE). However, CEs measured for the different the oxygen diffusion into the reactor also hindered proton transport to the cathode, reducing power increasing attention as a promising technology for wastewater treatment and energy recovery.1­4 The main

  7. Insertion Devices

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

    Vacuum Chamber The current ID vacuum chamber has a internal vertical aperture of 8 mm allowing for minimum undulator gap of 11 mm The current ID vacuum chamber...

  8. Fusion Nuclear Science and Technology Research Needed Now for Magnetic

    E-Print Network [OSTI]

    Chamber Research Plasma Chamber Research embodies the scientific and engineering disciplines required Chamber · Plasma Heating/Fueling/CD · Safety · Tritium · Materials · Design Studies #12;Scope of Plasma

  9. Superconducting Magnet with the Reduced Barrel Yoke for the Hadron Future Circular Collider

    E-Print Network [OSTI]

    Klyukhin, V I; Berriaud, C; Curé, B; Dudarev, A; Gaddi, A; Gerwig, H; Hervé, A; Mentink, M; Rolando, G; Da Silva, H F Pais; Wagner, U; Kate, H H J ten

    2015-01-01

    The conceptual design study of a hadron Future Circular Collider (FCC-hh) with a center-of-mass energy of the order of 100 TeV in a new tunnel of 80-100 km circumference assumes the determination of the basic requirements for its detectors. A superconducting solenoid magnet of 12 m diameter inner bore with the central magnetic flux density of 6 T is proposed for a FCC-hh experimental setup. The coil of 24.518 m long has seven 3.5 m long modules included into one cryostat. The steel yoke with a mass of 21 kt consists of two barrel layers of 0.5 m radial thickness, and 0.7 m thick nose disk, four 0.6 m thick end-cap disks, and three 0.8 m thick muon toroid disks each side. The outer diameter of the yoke is 17.7 m; the length without the forward muon toroids is 33 m. The air gaps between the end-cap disks provide the installation of the muon chambers up to the pseudorapidity of \\pm 3.5. The conventional forward muon spectrometer provides the measuring of the muon momenta in the pseudorapidity region from \\pm 2.7...

  10. Structural Design and Thermal Analysis for Thermal Shields of the MICE Coupling Magnets

    SciTech Connect (OSTI)

    Green, Michael A.; Pan, Heng; Liu, X. K.; Wang, Li; Wu, Hong; Chen, A. B.; Guo, X.L.

    2009-07-01

    A superconducting coupling magnet made from copper matrix NbTi conductors operating at 4 K will be used in the Muon Ionization Cooling Experiment (MICE) to produce up to 2.6 T on the magnet centerline to keep the muon beam within the thin RF cavity indows. The coupling magnet is to be cooled by two cryocoolers with a total cooling capacity of 3 W at 4.2 K. In order to keep a certain operating temperature margin, the most important is to reduce the heat leakage imposed on cold surfaces of coil cold mass assembly. An ntermediate temperature shield system placed between the coupling coil and warm vacuum chamber is adopted. The shield system consists of upper neck shield, main shields, flexible connections and eight supports, which is to be cooled by the first stage cold heads of two ryocoolers with cooling capacity of 55 W at 60 K each. The maximum temperature difference on the shields should be less than 20 K, so the thermal analyses for the shields with different thicknesses, materials, flexible connections for shields' cooling and structure design for heir supports were carried out. 1100 Al is finally adopted and the maximum temperature difference is around 15 K with 4 mm shield thickness. The paper is to present detailed analyses on the shield system design.

  11. Texas State University-San Marcos Ingram School of Engineering

    E-Print Network [OSTI]

    Asiabanpour, Bahram - Department of Engineering and Technology, Texas State University

    #12;Concept Generation #12;CAD file Chamber Concept #12;FMEA #12;Chamber/Pump assembly Final product

  12. Dry low NOx combustion system with pre-mixed direct-injection secondary fuel nozzle

    DOE Patents [OSTI]

    Zuo, Baifang; Johnson, Thomas; Ziminsky, Willy; Khan, Abdul

    2013-12-17

    A combustion system includes a first combustion chamber and a second combustion chamber. The second combustion chamber is positioned downstream of the first combustion chamber. The combustion system also includes a pre-mixed, direct-injection secondary fuel nozzle. The pre-mixed, direct-injection secondary fuel nozzle extends through the first combustion chamber into the second combustion chamber.

  13. Change in magnetic and structural properties of FeRh thin films by gold cluster ion beam irradiation with the energy of 1.67?MeV/atom

    SciTech Connect (OSTI)

    Koide, T.; Iwase, A. [Department of Materials Science, Osaka Prefecture University, Sakai, Osaka 599-8531 (Japan); Saitoh, Y. [Japan Atomic Energy Agency, Takasaki, Gunma 370-1292 (Japan); Sakamaki, M.; Amemiya, K. [High Energy Accelerator Research Organization, Tsukuba, Ibaraki 305-0801 (Japan); Matsui, T., E-mail: t-matsui@21c.osakafu-u.ac.jp [Research Organization for the 21st Century, Osaka Prefecture University Sakai, Osaka 599-8531 (Japan)

    2014-05-07

    The effect of energetic cluster ion beam irradiation on magnetic and structural properties of FeRh thin films have been investigated. The cluster ions used in the present studies consist of a few gold atoms with the energy of 1.67?MeV/gold atom. Saturation magnetization of the sample irradiated with Au3 cluster ion beam (280?emu/cc) is larger than that for the irradiated sample with Au1 ion beam (240?emu/cc) for the same irradiation ion fluence. These results can also be confirmed by the X-ray magnetic circular dichroism (XMCD) measurement; the XMCD signal for Au3 cluster ion irradiation is larger than that for Au1 ion irradiation. Since the ion beam irradiation induced magnetization of FeRh is significantly correlated with the amount of the lattice defects in the samples, cluster ion beam irradiation can be considered to effectively introduce the lattice defects in B2-type FeRh rather than the single ion beam. Consequently, cluster ion irradiation is better than single ion irradiation for the viewpoint of saturation magnetization, even if the same irradiation energy is deposited in the samples.

  14. Ram jet engine

    SciTech Connect (OSTI)

    Crispin, B.; Pohl, W.D.; Thomaier, D.; Voss, N.

    1983-11-29

    In a ram jet engine, a tubular combustion chamber is divided into a flame chamber followed by a mixing chamber. The ram air is supplied through intake diffusers located on the exterior of the combustion chamber. The intake diffusers supply combustion air directly into the flame chamber and secondary air is conveyed along the exterior of the combustion chambers and then supplied directly into the mixing chamber.

  15. Transposable elements Updated March 29, 2012 4 (none) Tpm kan (Tn903) Tn903 pkan none none --K CDE Epicentre

    E-Print Network [OSTI]

    Borenstein, Elhanan

    - - L2 CDI [6] T14 mTn5*-lacZ1 -em pLG51 Tpm (P) erm ? lacZ TS none - - L2 CDI [6] T15 ISR6K-em 7 pLG52a, pLG53, pLG55a Tpm (P) erm ? none none - ori R6K E ACE [6] T16 ISR6K-kan 8 pLG56a Tpm (P) kan ? none

  16. T.H.J.J. van der Hagen Chemical Engineering /

    E-Print Network [OSTI]

    van Vliet, Lucas J.

    secties Delft Ingenious Design Afdelingsbureau Quantum Nanoscience / QN L.P. Kouwenhoven 6.T. Wolterbeek 5 wetenschappelijke secties Afdelingsbureau Monday, May 06, 2013 Science Education & Communication

  17. **FULL TITLE** ASP Conference Series, Vol. **VOLUME**, **YEAR OF PUBLICATION**

    E-Print Network [OSTI]

    Novak, Giles

    is calculated from f = #6;R #18; #6;T #18; There are other ways to calculate f; for example, see Dowell et al

  18. 344 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 56, NO. 3, MARCH 2008 Statistics of General Order Selection in

    E-Print Network [OSTI]

    Elkashlan, Maged

    , p. 140] F1,···,n (1, · of Electrical and Computer Engineer- ing, The University of British Columbia, Vancouver, BC, Canada V6T 1Z4 (e

  19. The Development of Warm Gas Cleanup Technologies for the Removal of Sulfur Containing Species from Steam Hydrogasification

    E-Print Network [OSTI]

    Luo, Qian

    2012-01-01

    shale, natural bitumen, heavy oil and peat- Vol.I. 6. T.B.to hydrocracking of heavy oils in current refineries.

  20. 4-114 The volume of chamber 1 of the two-piston cylinder shown in the figure is to be determined. Assumptions At specified conditions, helium behaves as an ideal gas.

    E-Print Network [OSTI]

    Bahrami, Majid

    .0769(1 3 1 1 P mRT V 4-115 A propane tank contains 5 L of liquid propane at the ambient temperature. Now a leak develops at the top of the tank and propane starts to leak out. The temperature of propane when the pressure drops to 1 atm and the amount of heat transferred to the tank by the time the entire propane