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Report of the Working Group on Media Accelerators

Description: A summary is given of the activities of those in the Media Accelerator Group. Attention was focused on the Inverse Cherenkov Accelerator, the Laser Focus Accelerator, and the Beat Wave Accelerator. For each of these the ultimate capability of the concept was examined as well as the next series of experiments which needs to be performed in order to advance the concept.
Date: April 12, 1982
Creator: Sessler, Andrew M.
Partner: UNT Libraries Government Documents Department
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Lawrence Livermore National Laboratory laser-fusion program

Description: The goals of the Laser-Fusion Program at Lawrence Livermore National Laboratory are to produce well-diagnosed, high-gain, laser-driven fusion explosions in the laboratory and to exploit this capability for both military applications and for civilian energy production. In the past year we have made significant progress both theoretically and experimentally in our understanding of the laser interaction with both directly coupled and radiation-driven implosion targets and their implosion dynamics.… more
Date: July 12, 1982
Creator: Ahlstrom, H.G.
Partner: UNT Libraries Government Documents Department
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Target plane imaging system for the Nova laser

Description: The Nova laser, in operation since December 1984, is capable of irradiating targets with light at 1.05 ..mu..m, 0.53 ..mu..m, and 0.35 ..mu..m. Correct alignment of these harmonic beams uses a system called a target plane imager (TPI). It is a large microscope (four meters long, weighing one thousand kilograms) that relays images from the target chamber center to a video optics module located on the outside of the chamber. Several modes of operation are possible including: near-field viewing an… more
Date: December 12, 1985
Creator: Swift, C. D.; Bliss, E. S.; Jones, W. A.; Reeves, R. J.; Seppala, L. G.; Shelton, R. T. et al.
Partner: UNT Libraries Government Documents Department
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Novel, convenient, and nonpersistent radiotracer for environmental and energy applications

Description: A newly-available radioisotopic system, /sup 172/Hf-/sup 172/Lu, has excellent potential for tracer applications in which nuclear data acquisition must be accomplished in real time. The 6.7-day half-life of /sup 172/Lu is sufficient for a large fraction of tracer experiments, and should allow the direct incorporation of /sup 172/Lu into tests that have traditionally utilized much longer-lived radionuclides. Since /sup 172/Lu is the daughter component of a radioisotope generator, however, its ef… more
Date: March 12, 1984
Creator: Grant, P.M.
Partner: UNT Libraries Government Documents Department
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Determination of the beta energy (E/sub max/) using thin window instruments

Description: The use of simple survey instruments for beta-energy analysis is complicated by large differences that exist in the beta spectra shapes. These spectral shapes are often complex and change continuously as the betas are absorbed in air. Changes are also caused by absorbing material between the source and the detector. One may frequently encounter a combination of beta energies, either from multiple emissions from a single isotope or from several isotopes in the sample being evaluated. There may a… more
Date: August 12, 1983
Creator: Hankins, D.E.
Partner: UNT Libraries Government Documents Department
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Radiological design criteria for fusion power test facilities

Description: The quest for fusion power and understanding of plasma physics has resulted in planning, design, and construction of several major fusion power test facilities, based largely on magnetic and inertial confinement concepts. We have considered radiological design aspects of the Joint European Torus (JET), Livermore Mirror and Inertial Fusion projects, and Princeton Tokamak. Our analyses on radiological design criteria cover acceptable exposure levels at the site boundary, man-rem doses for plant p… more
Date: February 12, 1982
Creator: Singh, M.S. & Campbell, G.W.
Partner: UNT Libraries Government Documents Department
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Test problems in radiative transfer calculations

Description: Several test problems are presented for evaluating the radiation diffusion equations. For spatial transport schemes, 1-D problems with known analytic solutions are tested on 2-D domains with non-orthogonal meshes. It is shown that a scheme based on the Finite Element Method is insensitive to grid distortions when the diffusion term is dominant. Other test problems deal with Compton scattering, specifically the 1-D Fokker-Planck equation coupled to an equation describing the change in electron t… more
Date: January 12, 1989
Creator: Shestakov, A. I.; Kershaw, D. S. & Zimmerman, G. B.
Partner: UNT Libraries Government Documents Department
open access

Nova: a high energy laser system

Description: This review briefly describes the laser system, spatial filter, computer control system, and the 46 cm disk amplifier. (MOW)
Date: October 12, 1979
Creator: Godwin, R. O.
Partner: UNT Libraries Government Documents Department
open access

Recent results from the PEP4-TPC on quark fragmentation

Description: The physics goals for the PEP-4/PEP-9 experiment concentrate on two areas: the fragmentation properties of quarks and gluons produced in e+e- annihilation, and the investigation of hadron production in 2-photon collisions. Only the first of these topics is addressed. Despite the many successes of QCD in the description of deep inelastic reactions, the basic fragmentation process of quarks and gluons is not very well understood. This lack of knowledge has been shown to jeopardize precise test of… more
Date: November 12, 1983
Creator: Hofmann, W.
Partner: UNT Libraries Government Documents Department
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Test and evaluation of the BBC CQK 200-4 modulator tube for the MFTF sustaining neutral beam power supply system

Description: The BBC CQK 200-4 Tube was tested by Aydin at LLL, to confirm that it would switch 90 kV after conducting 88 amperes for 30 seconds. The CQK 200-4 is a recent modification of the CQK 200-3, an Rf transmitter tube designed for continuous loading, to increase the anode hold-off voltage to 150 kV. During the design life of the tube it will be subjected to 10/sup 5/ to 10/sup 6/ cyclic thermal loads. Two concerns are that (1) during the 30 second high current load, the screen grid may have excessiv… more
Date: November 12, 1979
Creator: Eckard, R.D.; Van Ness, H.W. & Hesselgrave, D.
Partner: UNT Libraries Government Documents Department
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Laser driven fusion fission hybrids

Description: The role of the fusion-fission hybrid reactor (FFHR) as a fissile fuel and/or power producer is discussed. As long range options to supply the world energy needs, hybrid-fueled thermal-burner reactors are compared to liquid metal fast breeder reactors (LMFBR). A discussion of different fuel cycles (thorium, depleted uranium, and spent fuel) is presented in order to compare the energy multiplication, the production of fissile fuel, the laser efficiency and pellet gain requirements of the hybrid … more
Date: July 12, 1977
Creator: Hansen, L. F. & Maniscalco, J. A.
Partner: UNT Libraries Government Documents Department
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Condensed Matter at High Shock Pressures

Description: Experimental techniques are described for shock waves in liquids: Hugoniot equation-of-state, shock temperature and emission spectroscopy, electrical conductivity, and Raman spectroscopy. Experimental data are reviewed and presented in terms of phenomena that occur at high densities and temperatures in shocked He, Ar, N/sub 2/, CO, SiO/sub 2/-aerogel, H/sub 2/O, and C/sub 6/H/sub 6/. The superconducting properties of Nb metal shocked to 100 GPa (1 Mbar) and recovered intact are discussed in ter… more
Date: July 12, 1985
Creator: Nellis, W. J.; Holmes, N. C.; Mitchell, A. C.; Radousky, H. B. & Hamilton, D.
Partner: UNT Libraries Government Documents Department
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Large aperture optical switching devices

Description: We have developed a new approach to constructing large aperture optical switches for next generation inertial confinement fusion lasers. A transparent plasma electrode formed in low pressure ionized gas acts as a conductive coating to allow the uniform charging of the optical faces of an electro-optic material. In this manner large electric fields can be applied longitudinally to large aperture, high aspect ratio Pockels cells. We propose a four-electrode geometry to create the necessary high c… more
Date: December 12, 1983
Creator: Goldhar, J. & Henesian, M.A.
Partner: UNT Libraries Government Documents Department
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Inertial confinement fusion (ICF). [Review of research progress]

Description: The principal goal of the inertial confinement fusion program is the development of a practical fusion power plant in this century. Rapid progress has been made in the four major areas of ICF--targets, drivers, fusion experiments, and reactors. High gain targets have been designed. Laser, electron beam, and heavy ion accelerator drivers appear to be feasible. Record-breaking thermonuclear conditions have been experimentally achieved. Detailed diagnostics of laser implosions have confirmed predi… more
Date: October 12, 1977
Creator: Nuckolls, J.
Partner: UNT Libraries Government Documents Department
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Conservative Differencing of the Electron Fokker-Planck Transport Equation

Description: We need to extend the applicability and improve the accuracy of kinetic electron transport codes. In this paper, special attention is given to modelling of e-e collisions, including the dominant contributions arising from anisotropy. The electric field and spatial gradient terms are also considered. I construct finite-difference analogues to the Fokker-Planck integral-differential collision operator, which conserve the particle number, momentum and energy integrals (sums) regardless of the coar… more
Date: January 12, 1981
Creator: Langdon, A. B.
Partner: UNT Libraries Government Documents Department
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Heterodyne phase shift diagnostic for measuring atomic vapor density

Description: We describe a technique for atomic density measurements. We generate and recombine frequency shifted laser beams producing beat signals on reference and signal detectors. Opacity in the signal detector leg is proportional to the phase difference between detector signals. 4 refs., 2 figs.
Date: November 12, 1987
Creator: Crane, J. K.; Paisner, J. A.; Johnson, M. A.; Story, T. W.; Barclay, C.; George, J. D. et al.
Partner: UNT Libraries Government Documents Department
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Vacuum measurements on the Tandem Mirror Experiment Upgrade (TMX-U) fusion experiment

Description: The gas inventory of the Tandem Mirror Experiment Upgrade (TMX-U) must be carefully controlled, if it is to successfully create various plasma configurations for thermal-barrier experiments designed to provide an improved performance for tandem-mirror experiments. This paper is a progress report on the calibration methods and pressure measurements of machine conditions deriving from recently improved neutral-beam gas control, and changes to the internal baffling geometry and the gettering syste… more
Date: August 12, 1983
Creator: Calderon, M. O.; Hunt, A. L.; Lang, D. D.; Nexsen, W. E.; Pickles, W. L. & Turner, W. C.
Partner: UNT Libraries Government Documents Department
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MFTF supervisory control and diagnostics system hardware

Description: The Supervisory Control and Diagnostics System (SCDS) for the Mirror Fusion Test Facility (MFTF) is a multiprocessor minicomputer system designed so that for most single-point failures, the hardware may be quickly reconfigured to provide continued operation of the experiment. The system is made up of nine Perkin-Elmer computers - a mixture of 8/32's and 7/32's. Each computer has ports on a shared memory system consisting of two independent shared memory modules. Each processor can signal other … more
Date: November 12, 1979
Creator: Butner, D.N.
Partner: UNT Libraries Government Documents Department
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Development of a Plasma Streaming System for the Mirror Fusion Test Facility

Description: The Plasma Streaming System (PSS) is an essential portion of the Mirror Fusion Test Facility (MFTF), scheduled for completion in October 1981. The PSS will develop a plasma density of at least 2 x 10/sup 12/ particles/cm/sup 3/ at the MFTF magnet centerline by injecting particles along the field lines. The plasma will have a midplane plasma radius as large as 40 cm with variable plasma particle energy and beam geometry. Minimum amounts of impurities will be injected, with emphasis on minimizing… more
Date: November 12, 1979
Creator: Holdsworth, T.; Clark, R.N.; McCotter, R.E.; Rossow, T.L. & Cruz, G.E.
Partner: UNT Libraries Government Documents Department
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X-ray backlighting sources of 4 to 10 keV for laser-fusion targets

Description: High-intensity, short-duration x-ray pulses are necessary to diagnose the compression of laser film targets. Present target designs are such that backlighting sources ranging from a few thousand electron volts to 100 keV will be necessary. The desired source durations range from a few tens of picoseconds for flash radiography to several nanoseconds for streaked backlighting, and the source occurrence must be tightly synchronized to that of the target-irradiating laser pulse. For the latter reas… more
Date: May 12, 1981
Creator: Rupert, V. C.; Matthews, D. L. & Koppel, L. N.
Partner: UNT Libraries Government Documents Department
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