UNT Libraries Government Documents Department - 19 Matching Results

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open access

Communicating health physics

Description: This report describes methods for communicating health physics information to personnel.
Date: June 26, 1997
Creator: Hochheiser, E.
open access

Crystal growth and roughening of solid D{sub 2}

Description: Near the triple point, growth shapes of vapor deposited hexagonal close packed D{sub 2} crystals reveal two crystal orientations contain facets which persist up to the melt. This observation is in contrast with previous experiments on rare gas solids and H{sub 2} where the highest T{sub r} measured is 0.8 T{sub tp}.
Date: March 26, 1997
Creator: Kozioziemski, B.J.; Collins, G.W. & Bernat, T.P.
open access

Designs for a high power superconducting delay line

Description: Potential designs for a high power superconducting delay line of approximately 10 microsecs duration are described. The transmitted signal should have low dispersion and little attenuation to recapture the original signal. Such demands cannot be met using conventional metal conductors. This paper outlines a proposal for a new transmission line design using low temperature superconducting material which meets system specifications. The 25 omega line is designed to carry pulsed signals with an ap… more
Date: June 26, 1997
Creator: Chen, Y. J. & Caporaso, G.
open access

Effects of symmetry on circular and linear magnetic dichroism in angle-resolved photoemission spectra of Gd/Y (0001) and Fe-Ni//Cu (001)

Description: We have observed circular and linear magnetic dichroism in angle- resolved photoemission spectra of 50-monolayer Gd film grown on Y(0001) and 6-monolayer Fe-Ni alloy films grown on Cu(001). The 4f level of Gd and the Fe 3p level of the Fe-Ni alloy were measured. A different geometry was used for the magnetic circular dichroism than was used to measure the magnetic linear dichroism. The geometries were chosen so that the shape of the magnetic circular dichroism is predicted to be equal to the sh… more
Date: March 26, 1997
Creator: Goodman, K. W.; Tobin, J. G.; Schumann, F. O.; Willis, R. F.; Gammon, J. W.; Pappas, D. P. et al.
open access

Experimental and numerical study of E-beam evaporation of titanium

Description: An experimental and numerical study is performed for the electron- beam evaporation of pure titanium from a bottom fed vapor source. In the experiments, an electron beam operating in the nominal range of 30-40 [kW] was used to evaporate metal from the top of a 3 inch diameter rod. Variations were made in the e-beam power, sweep pattern, and sweep frequency, and the total evaporation rate was measured from feed consumption and laser absorption. The solid-pool interface was obtained from metallog… more
Date: November 26, 1997
Creator: McClelland, M. A.; Westerberg, K. W.; Meier, T. C.; Braun, D. G.; Berrins, L. V. & Anklam, T. M.
open access

F-Theory, T-Duality on K3 Surfaces and N = 2 Supersymmetric Gauge Theories in Four Dimensions

Description: We construct T-duality on K3 surfaces. The T-duality exchanges a 4-brane R-R charge and a O-brane R-R charge. We study the action of the T-duality on the moduli space of O-branes located at points of K3 and 4-branes wrapping it. We apply the construction to F-theory compactified on a Calabi-Yau 4-fold and study the duality of N = 2 SU(N{sub c}) gauge theories in four dimensions. We discuss the generalization to the N = 1 duality scenario.
Date: February 26, 1997
Creator: Hori, K. & Oz, Y.
open access

The Faraday effect in Cd{sub 0.57}Mn{sub 0.43}Te in high magnetic field

Description: The experimental results of Faraday rotation (FR) measurements in dilute magnetic semiconductors in high magnetic field are presented (Dirac Series--Los Alamos). The magnetic field is produced by an explosive-driven flux-compression generator (150 T). Measurements have been carried with samples of Cd{sub 1{minus}x}Mn{sub x}Te with x = 0.43 using 633 nm light at liquid helium temperature. The FR increases in such samples when the magnetic field exceeds 60 T. Interband exchange interaction and th… more
Date: March 26, 1997
Creator: Platonov, V.V.; Tatsenko, O.M. & Bykov, A.I.
open access

High-energy x-ray microscopy of laser-fusion plasmas at the National Ignition Facility

Description: Multi-keV x-ray microscopy will be an important laser-produced plasma diagnostic at future megajoule facilities such as the National Ignition Facility (NIF).In preparation for the construction of this facility, we have investigated several instrumentation options in detail, and we conclude that near normal incidence single spherical or toroidal crystals may offer the best general solution for high-energy x-raymicroscopy at NIF and at similar large facilities. Kirkpatrick-Baez microscopes using … more
Date: August 26, 1997
Creator: Koch, J. A.; Landen, O. L. & Hammel, B. A.
open access

LLNL flash x-ray radiography machine (FXR) double-pulse upgrade diagnostics

Description: When the FXR machine was first tuned on the 1980`s, a minimal amount of diagnostics was available and consisted mostly of power monitors. During the recent accelerator upgrade, additional beam diagnostics were added. The sensor upgrades included beam bugs (resistive wall beam motion sensors) and high-frequency B-dot. Even with this suite of measurement tools, tuning was difficult. For the current Double- Pulse Upgrade, beam transport is a more complex problem--the beam characteristics must be m… more
Date: June 26, 1997
Creator: Ong, M.; Avalee, C.; Richardson, R. & Zentler, J.
open access

Modeling the behavior of an earthquake base-isolated building.

Description: Protecting a structure against earthquake excitation by supporting it on laminated elastomeric bearings has become a widely accepted practice. The ability to perform accurate simulation of the system, including FEA of the bearings, would be desirable--especially for key installations. In this paper attempts to model the behavior of elastomeric earthquake bearings are outlined. Attention is focused on modeling highly-filled, low-modulus, high-damping elastomeric isolator systems; comparisons are… more
Date: November 26, 1997
Creator: Coveney, V. A.; Jamil, S.; Johnson, D. E.; Kulak, R. F. & Uras, R. A.
open access

Polyimide capsules may hold high pressure DT fuel without cryogenic support for the National Ignition Facility indirect-drive targets

Description: New target designs for the Omega upgrade laser and ignition targets in the National Ignition Facility (NIF) require thick (80 - 100 {micro}m) cryogenic fuel layers. The Omega upgrade target will require cryogenic handling after initial fill because of the high fill pressures and the thin capsule walls. For the NIF indirectly driven targets, a larger capsule size and new materials offer hope that they can be built, filled and stored in a manner similar to the targets used in the Nova facility wi… more
Date: March 26, 1997
Creator: Sanchez, J. J. & Letts, S. A.
open access

Preliminary paper - Integrated control process for the development of the mined geologic disposal system

Description: The US Department of Energy (DOE) Order 430.1, Life Cycle Asset Management, begins to focus DOE Programs and Projects on the total system life cycle instead of looking at project execution or operation as individual components. As DOE begins to implement this order, the DOE Management and Operating contractors must develop a process to control not only the contract baseline but also the overall life cycle baseline. This paper presents an integrated process that is currently being developed on t… more
Date: November 26, 1997
Creator: Daniel, Russell B.; Harbert, Kevin R. & Calloway, David E.
open access

Reengineering and health physics within the project Hanford management contract

Description: The impending transition of the Hartford Site management and operations (M&O) contract to a management and integrating (M&I) contract format, together with weak radiological performance assessments by external organizations and reduced financial budgets prompted the `re-engineering` of the previous Hanford prime contractor Radiological Control (Rad Con) organization. This paper presents the methodology, identified areas of improvements, and results of the re-engineering process. The conversion … more
Date: June 26, 1997
Creator: Atencio, E. M.
open access

Research and energy efficiency: Selected success stories

Description: Energy use and energy technology play critical roles in the U.S. economy and modern society. The Department of Energy (DOE) conducts civilian energy research and development (R&D) programs for the purpose of identifying promising technologies that promote energy security, energy efficiency, and renewable energy use. DOE-sponsored research ranges from basic investigation of phenomena all the way through development of applied technology in partnership with industry. DOE`s research programs are c… more
Date: June 26, 1997
Creator: Garland, P. W. & Garland, R. W.
open access

Sharing lessons learned - what have we learned?

Description: A set of viewgraphs for presenting what has been learned from experience with the Department of Energy`s Lessons Learned program, covering a brief history, the system and tools for sharing and accessing Lessons Learned, and how Lessons Learned can help the audience.
Date: November 26, 1997
Creator: Bickford, J. C.
open access

Simulation studies of vapor bubble generation by short-pulse lasers

Description: Formation of vapor bubbles is characteristic of many applications of short-pulse lasers in medicine. An understanding of the dynamics of vapor bubble generation is useful for developing and optimizing laser-based medical therapies. To this end, experiments in vapor bubble generation with laser light deposited in an aqueous dye solution near a fiber-optic tip have been performed. Numerical hydrodynamic simulations have been developed to understand and extrapolate results from these experiments. … more
Date: October 26, 1997
Creator: Amendt, P.; London, R. A. & Strauss, M.
open access

Sputter-deposited Be ablators for NIF target capsules

Description: We have performed a series of preliminary experiments to determine whether sputter deposition of doped Be is a practical route to producing NIF target capsules with Be ablators. Films ranging in thickness from 7 to {approximately} 120 {micro}m have been deposited on spherical polymer mandrels using a bounce pan to ensure uniform coating. With no voltage bias applied to the pan, relatively porous coatings were formed that were highly permeable to hydrogen. The surface finish of these films range… more
Date: March 26, 1997
Creator: McEachern, R.; Clford, C.; Cook, R.; Makowiecki, E. & Wallace, R.
open access

Time-resolved x-ray spectroscopy of deeply buried tracer layers as a density and temperature diagnostic for the fast ignitor

Description: The fast igniter concept for inertial confinement fusion relies on the generation of hot electrons, produced by a short-pulse ultra-high intensity laser, which propagate through high-density plasma to deposit their energy in the compressed fuel core and heat it to ignition. In preliminary experiments designed to investigate deep heating of high density matter, we used a 20 joule, 0.5-30 ps laser to heat solid targets, and used emission spectroscopy to measure plasma temperatures and densities a… more
Date: March 26, 1997
Creator: Nikitenko, A. I., Lebedev Physical Institute, Russian Academy of Sciences
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