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Backward np Scattering With a Polarized Target

Description: The authors have measured the polarization parameter P in neutron-proton elastic scattering near the backward direction, using a polarized proton target. Measurements covered the range of incident neutron moment from 1.0 to 5.5 GeV/c and of four-momentum transfer squared u from -0.005 to -0.5 (GeV/c){sup 2}. Forward going protons were detected by means of a wire-spark-chamber spectrometer. Slow neutrons near 90 deg lab angle were detected in coincidence by means of an array of plastic scintilla… more
Date: January 1970
Creator: Robrish, Peter R.; Chamberlain, Owen; Field, Richard D., Jr.; Fuzesy, Raymond Z.; Gom, W.; Morehouse, Charles C. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fusion with highly spin polarized HD and D{sub 2}. Final report, December 14, 1991--June 30, 1993

Description: The experimental efforts over the past 5 years have been aimed at carrying out ICF shots with spin-polarized D fuel. The authors successfully prepared polarized D in HD, and solved the problems of loading target shells with their carefully prepared isotopic mixtures, polarizing them so that the D polarization remains metastably frozen-in for about half a day, and carrying out the various cold transfer requirements at Syracuse, where the target is prepared, and at Rochester, where the cold targe… more
Date: December 17, 1993
Creator: Honig, A.; Letzring, S. & Skupsky, S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Spin Degrees of Freedom in Electron Nucleon Scattering in the Resonance Region

Description: Some aspects of using polarized electrons and/or polarized targets in electron-nucleon scattering experiments are discussed.Polarization measurements can be used to extend the knowledge of nucleon form-factor measurements to higher Q^2 and are indispensable for model-independent extraction of the helicity amplitudes of exclusive meson production.Measurements of polarization asymmetries may also help in revealing the excitation of weaker resonances.
Date: January 1, 1987
Creator: Burkert, Volker
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Partner: UNT Libraries Government Documents Department
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A Polarized Target for the CLAS detector

Description: We describe the design, construction, and performance of a polarized solid target for use in electron scattering experiments with the CEBAF Large Acceptance Spectrometer (CLAS). Protons and deuterons are continuously polarized by microwave-induced spin flip transitions at 1 K and 5 T. The target operated successfully during two cycles in 1998 and 2000, providing proton and deuteron polarizations as high as 96% and 46%, respectively. The unique features of the target which permit its use inside … more
Date: September 1, 2002
Creator: Keith, C.D.; Anghinolfi, M.; Battaglieri, M.; Branford, D.; Bultmann, S.; Burkert, V.D. et al.
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Partner: UNT Libraries Government Documents Department
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Thermal electric and magnetic fields at the surface of an electron beam target

Description: A relativistic electron beam pulse of high current density will heat a thin target plate to a plasma state as it traverses. The gradient of plasma temperature--Te is predominantly radial, and the gradient of plasma density--ne is predominantly axial. The cross product of these terms is significant at the vacuum-to-metal interface through which the beam enters. This cross product is a thermal source of magnetization, which can be much larger than the vacuum magnetic field of the electron beam, a… more
Date: June 9, 1999
Creator: Garcia, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Time Resolved Shadowgraph Images of Silicon during Laser Ablation:Shockwaves and Particle Generation

Description: Time resolved shadowgraph images were recorded of shockwaves and particle ejection from silicon during laser ablation. Particle ejection and expansion were correlated to an internal shockwave resonating between the shockwave front and the target surface. The number of particles ablated increased with laser energy and was related to the crater volume.
Date: May 6, 2006
Creator: Liu, C.Y.; Mao, X.L.; Greif, R. & Russo, R.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Oak Ridge National Laboratory Target Preparation Program

Description: In early 1961 a Target Fabrication Center was established at Oak Ridge National Laboratory to carry out the routine preparation of a wide variety of targets and to provide research and development support to the target program. Although most of the effort concerned enriched stable isotopes, both normal and radioactive materials are also handled. With the aid of rolling mills, resistance-heat and electron-bombardment vacuum evaporation, presses, and electroplating equipment, targets of elements … more
Date: January 15, 1963
Creator: Kobisk , E. H
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Setting Whole-Building Absolute Energy Use Targets for the K-12 School, Retail, and Healthcare Sectors: Preprint

Description: This paper helps owners' efficiency representatives to inform executive management, contract development, and project management staff as to how specifying and applying whole-building absolute energy use targets for new construction or renovation projects can improve the operational energy performance of commercial buildings.
Date: August 1, 2012
Creator: Leach, M.; Bonnema, E.; Pless, S. & Torcellini, P.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Secondary neutron-production cross sections from heavy-ioninteractions in composite targets.

Description: Secondary neutron-production cross-sections have been measured from interactions of 290 MeV/nucleon C and 600 MeV/nucleon Ne in a target composed of simulated Martian regolith and polyethylene, and from 400 MeV/nucleon Ne interactions in wall material from the International Space Station. The data were measured between 5 and 80 deg in the laboratory. We report the double-differential cross sections, angular distributions, and total neutron-production cross sections from all three systems. The s… more
Date: December 19, 2005
Creator: Heilbronn, L.; Iwata, Y.; Iwase,H.; Murakami, T.; Sato, H.; Nakamura, T. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Jefferson Lab Frozen Spin Target

Description: A frozen spin polarized target, constructed at Jefferson Lab for use inside a large acceptance spectrometer, is described. The target has been utilized for photoproduction measurements with polarized tagged photons of both longitudinal and circular polarization. Protons in TEMPO-doped butanol were dynamically polarized to approximately 90% outside the spectrometer at 5 T and 200-300 mK. Photoproduction data were acquired with the target inside the spectrometer at a frozen-spin temperature of ap… more
Date: August 1, 2012
Creator: Christopher Keith, James Brock, Christopher Carlin, Sara Comer, David Kashy, Josephine McAndrew, David Meekins, Eugene Pasyuk, Joshua Pierce, Mikell Seely
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Partner: UNT Libraries Government Documents Department
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Electrostatic levitation and transport of laser fusion targets

Description: Several levitation concepts have been evaluated resulting in the electrostatic quadrupole being chosen as the most universal. A levitator has been constructed to handle laser fusion targets during and between the processing steps. The levitator is based on a quadrupole rail which is segmented to provide electrically controlled transport and confinement along the rail. This device has demonstrated transport both vertical and horizontal of targets with appropriate mass to size ratios and exhibits… more
Date: May 22, 1980
Creator: Johnson, W. L. & Hendricks, C. D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Target production for inertial fusion energy

Description: Inertial fusion energy (IFE) power plants will require the ignition and burn of 5-10 fusion fuel targets every second. The technology to economically mass produce high-quality, precision targets at this rate is beyond the current state of the art. Techniques that are scalable to high production rates, however, have been identified for all the necessary process steps, and many have been tested in laboratory experiments or are similar to current commercial manufacturing processes. In this paper, … more
Date: March 1, 1995
Creator: Woodworth, J.G. & Meier, W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Pulsed power particle beam fusion research

Description: Although substantial progress has been made in the last few years in developing the technology of intense particle beam drivers, there are still several unanswered questions which will determine their ultimate feasibility as fusion ignition systems. The questions of efficiency, cost, and single pulse scalability appear to have been answered affirmatively but repetitive pulse technology is still in its infancy. The allowable relatively low pellet gains and high available beam energies should gre… more
Date: January 1, 1979
Creator: Yonas, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Suppression of ignition by interface instabilities in small fusion targets

Description: Concern over hydrodynamic instabilities in small fusion targets has prompted numerous studies of instability onset, but few studies of the consequences. Here for the first time a mechanism is identified which tends to suppress ignition in small fusion targets. The mechanism is that of radiative energy loss into the increased area of a perturbed surface. Quantitative assessment of this mechanism is provided by modeling it in a 12 parameter burn code. It is contrasted with two other mechanisms an… more
Date: January 1, 1981
Creator: Kirkpatrick, R.C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Report of the Internal Target Working Group

Description: The goals of the internal target working group are to explore: (1) physics experiments which require or would benefit from an internal target method, and (2) the technical feasibility of internal target experiments. Two general classes of physics which require an internal target method are experiments involving polarized targets which necessarily have very low densities from the polarization process and experiments which require thin targets, i.e., the reaction products have high stopping power… more
Date: January 1, 1985
Creator: Holt, R.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Target factory in perspective

Description: A target factory diagram has been constructed for an analysis of the shell coating process system in relation to target production. The number of deposition units needed to achieve the coating requirements will be a major target production operating cost.
Date: April 11, 1980
Creator: Sherohman, J.W. & Hendricks, C.D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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An analysis of the survivability of sensor darts in impacts with trees.

Description: A methodology was developed for computing the probability that the sensor dart for the 'Near Real-Time Site Characterization for Assured HDBT Defeat' Grand-Challenge LDRD project will survive deployment over a forested region. The probability can be decomposed into three approximately independent probabilities that account for forest coverage, branch density and the physics of an impact between the dart and a tree branch. The probability that a dart survives an impact with a tree branch was det… more
Date: July 1, 2005
Creator: Prentice, John K. (Sci-Tac, Inc., Boulder, CO.) & Gardner, David Randall
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Performance evaluation of the Antares Reference Telescope System

Description: The Antares Reference Telescope System is a complicated electro-optical-mechanical system whose main purpose is to enable positioning of targets used in the Antares Laser System to within 10 ..mu..m of a selected nominal position. To date, it has been used successfully to position targets ranging in size from 300 ..mu..m to 2 mm. The system consists of two electro-optical systems positioned in a nearly orthogonal manner. This ''cross telescope'' configuration facilitates accurate positioning in… more
Date: January 1, 1985
Creator: Parker, J. R.; Woodfin, G. L. & Viswanathan, V. K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Gaseous Laser Targets and Optical Dignostics for Studying Compressible Turbulent Hydrodynamic Instabilities

Description: The possibility of studying compressible turbulent flows using gas targets driven by high power lasers and diagnosed with optical techniques is investigated. The potential advantage over typical laser experiments that use solid targets and x-ray diagnostics is more detailed information over a larger range of spatial scales. An experimental system is described to study shock - jet interactions at high Mach number. This consists of a mini-chamber full of nitrogen at a pressure {approx} 1 atms. Th… more
Date: February 8, 2005
Creator: Edwards, M J; Hansen, J; Miles, A R; Froula, D; Gregori, G; Glenzer, S et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Temperature-dependent tensile strength, surface roughness diagnostics, and magnetic support and positioning of polymer ICF shells. Final report, October 1, 1993--April 30, 1995

Description: During the course of this grant, we perfected emissivity and accommodation coefficient measurements on polymer ICF shells in the temperature range 250 to 350 K. Values for polystyrene shells are generally between 10{sup -2} and 10{sup -3}, which are very advantageous for ICF at cryogenic temperatures. Preliminary results on Br doped target shells indicate an accommodation coefficient, presumably associated with surface roughness on an atomic scale, about an order of magnitude larger than for or… more
Date: December 15, 1995
Creator: Honig, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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HUD PowerSaver Pilot Loan Program

Description: The U.S. Department of Housing and Urban Development (HUD) recently announced the creation of a pilot loan program for home energy improvements. The PowerSaver loan program is a new, energy-focused variant of the Title I Property Improvement Loan Insurance Program (Title I Program) and is planned for introduction in early 2011. The PowerSaver pilot will provide lender insurance for secured and unsecured loans up to $25,000 to single family homeowners. These loans will specifically target reside… more
Date: December 10, 2010
Creator: Zimring, Mark & Hoffman, Ian
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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