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LLE Review, Quarterly Report: Volume 49, October-December 1991

Description: This volume of the LLE Review, covering the period October-December 1991, contains articles on the analysis of argon-filled target experiments, and a theoretical analysis of the impact of nonlocal heat transport in laser filamentation in plasmas. In the Advanced Technology section there is an article on mechanisms that affect thin-film conductivity, and a report on the gain characteristics of the 20-cm SSA prototype amplifier to be used in the OMEGA Upgrade. Finally, the activities of the Natio… more
Date: January 1, 1991
Creator: Keck, R. L.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 54, January-March 1993

Description: This volume of the LLE Review covers the three-month period January--March 1993. The OMEGA laser facility was decommissioned during this quarter to make room for the OMEGA Upgrade laser facility. The decommissioning is described in this volume. Electron thermal transport in the corona and laser-irradiation uniformity are related issues for direct-drive laser fusion. Thermal transport can affect the laser-irradiation uniformity requirements. The status of Fokker-Planck modeling of electron trans… more
Date: July 1, 1993
Creator: Meyerhofer, D. D.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 43, April-June 1990

Description: This volume of the LLE Review, covering the period April--June 1990, contains articles in two main sections, Progress in Laser Fusion and Advanced Technology Developments. The first article presents the theoretical interpretation of the glass-ablator cryogenic-implosion experiments recently conducted on OMEGA. It is followed by an article describing the analysis of neutron time-of-flight data taken during DT and DD experiments; and a discussion of the improvements to laser diagnostics that now … more
Date: January 1, 1990
Creator: Kumpan, S. A.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 55, April-June 1993

Description: This volume of the LLE Review, covering the period April--June 1993, contains articles on spectral features from argon-filled target implosions on OMEGA, and on the theory of an implicit difference scheme for the Fokker-Planck equation. The advanced technology section includes reports on a novel polymer liquid-crystal wave plate and a new scheme for phase conversion of the OMEGA Upgrade beams that results in greater, smoother energy deposition on fusion targets. Finally, reports on the as-desig… more
Date: October 1, 1993
Creator: Hutchison, R. J.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 58, January-March 1994

Description: This volume of the LLE Review, covering the period Jan - Mar 1994, contains articles on backlighting diagnostics; the effect of electron collisions on ion-acoustic waves and heat flow; using PIC code simulations for analysis of ultrashort laser pulses interacting with solid targets; creating a new instrument for characterizing thick cryogenic layers; and a description of a large-aperture ring amplifier for laser-fusion drivers. Three of these articles - backlighting diagnostics; characterizing … more
Date: July 1, 1994
Creator: Simon, A.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 62, January-March 1995

Description: This volume of the LLE review, covering the period of January-March 1995, contains articles on the evaluation of the mechanism for laser damage in OMEGA UV multilayer coatings using a combination of conventional laser-damage characterization methods and atomic force microscopy; a dual-amplitude, fiber-coupled waveguide integrated-optic modulation device for generating temporally shaped optical pulses in OMEGA-, a proposal for modifying the indirect-drive irradiation geometry of the National Ign… more
Date: July 1, 1995
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 69, October-December 1996

Description: This volume of the LLE Review, covering the period October-December 1996, includes a review of 2-D SSD as implemented on the OMEGA laser system. A summary of the detailed mathematical formalism is shown, and the predicted level of uniformity achievable on OMEGA is given. The first experimental results on uniformity using narrow-band 2-D SSD are compared to theoretical calculations. Excellent agreement between experiment and theory is found, which gives confidence that broadband 2-D SSD with pol… more
Date: April 1, 1997
Creator: Town, Richard
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 68, July-September 1996

Description: This volume of the LLE Review, covering the period of July-September 1996, includes a description of an important experiment carried out on OMEGA by researchers from LANL, LLNL, and LLE to demonstrate the feasibility of using OMEGA for indirect drive. Additional topics include tetrahedral hohlraums, the speckle properties of phase- converted laser beams, design criteria for SSD phase modulators, and the design of slab amplifiers. Highlights of the research presented in this issue are (1) Result… more
Date: July 1, 1996
Creator: Skledon, Mark E.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 67, April-June 1996

Description: This volume contains articles detailing several nonlinear processes associated with lasers and their use, as well as an article describing the computer control systems necessary to maintain and operate a large laser system such as the 60-beam OMEGA laser. The specific topics discussed in this issue include stimulated scattering in laser plasmas, power exchange between interacting laser beams, charged particles interacting with a laser pulse, thermal equilibration of optically excited states, an… more
Date: November 1, 1996
Creator: Skeldon, Mark D.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 66, January-March 1996

Description: This volume of the LLE Review, covering the period January-March 1996, contains three articles related to spherical implosions and their diagnosis, one article that provides an analysis of laser-plasma interactions, and three articles on advanced technologies developed at LLE.
Date: June 1, 1996
Creator: Boehly, T. R.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 71, April-June 1997

Description: This volume of the LLE Review, covering the period April-June 1997, includes an article discussing the results from recent experiments performed on OMEGA. These experiments used a new beam-smoothing device-distributed polarization rotators-in concert with existing techniques to improve the on-target uniformity of each beam. The result of this improved radiation uniformity was a substantive reduction in imprinting-the nonuniformity caused by the laser. A novel way to study the time dependence of… more
Date: October 1, 1997
Creator: Harding, David
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 72, July-September 1997

Description: This volume of the LLE Review, covering the period July--September 1997, begins with a general introduction to LLE`s experimental physics program and a report on recent results. This article includes a useful summary of the system`s operational capabilities and system parameters. Other highlights of the wide variety of research presented in this issue are: a promising method to directly observe the cold compressed shell of an imploding target. The shell is normally observed by backlighting. The… more
Date: February 1, 1998
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 84, July-September 2000

Description: This volume of the LLE Review, covering July-September 2000, begins with an article by T. R. Boehly, V. N. Goncharov, O. Gotchev, J. P. Knauer, D. D. Meyerhofer, D. Oron, S. P. Regan, Y. Srebro, W. Seka, D. Shvarts, S. Skupsky, and V.A. Smalyuk, who describe measurements of the effect of beam smoothing and pulse shape on imprinting. (Imprinting is defined as the imposition of pressure perturbations on the target by spatial variations in the laser intensity.) A principal result is the observatio… more
Date: December 1, 2000
Creator: Marshall, Frederic J.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 79, April-June 1999

Description: This volume of the Laboratory for Laser Energetics (LLE) Review, covering the period April-June 1999, features a theoretical analysis of direct-drive target performance on National Ignition Facility (NIF). In this article R. P. J. Town, J. A. Delettrez, R. Epstein, V. N. Goncharov, R. L. McCrory, P. W. McKenty, R. W. Short, and S. Skupsky detail ignition target designs developed at LLE specifically to achieve successful direct-drive ignition on the NIF facility. A baseline ''all-DT'' target des… more
Date: April 1, 1999
Creator: Morse, Samuel F. B.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 73, October-December 1997

Description: This progress report contains discussion on the following topics: A high-bandwidth electrical-waveform generator based on aperture-coupled striplines for OMEGA pulse-shaping applications; sweep deflection circuit development using computer-aided circuit design for the OMEGA multichannel streak camera; D-{sup 3}He protons as a diagnostic for target {rho}R; growth rates of the ablative Rayleigh-Taylor instability in inertial confinement fusion; three-dimensional analysis of the power transfer bet… more
Date: April 1, 1998
Creator: Jacobs, Stephen D.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 65, October-December 1995

Description: This volume of the LLE Review, covering the period October-December 1995, contains a description of the generation and characterization of continuous, deep-surface-relief phase plates that are more efficient and versatile than previous designs. The LLE program plan has scheduled a number of enhancements to OMEGA`s performance and uniformity, the first of which is the implementation of these new distributed phase plates. Other articles in this volume include the discussion of an x-ray diagnostic… more
Date: June 1, 1996
Creator: Boehly, T. R.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 64, July-September 1995

Description: This volume of the LLE Review, covering the period July--September 1995, includes a description of the first target experiments performed on the upgraded OMEGA laser system. These experiments, carried out to active and test several diagnostics systems, have demonstrated successful functioning of the overall experimental system and have produced high neutron yields and high core temperatures. Other articles in this volume describe the diagnosis of core conditions using krypton line spectroscopy,… more
Date: September 1, 1995
Creator: Craxton, R. S.
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 74, January-March 1998

Description: This volume of the LLE Review covers the period January--March 1998. The first of eight articles documents the in-house development, scale-up, and manufacture of 60 continuous distributed phase plates with high laser-damage resistance. D.J. Smith et al. describe how inert ion beams were used to etch a continuously varying pattern into the surface of fused silica to form these devices. Other highlights of research presented in this issue are: (1) a soft x-ray microscope with high spatial resolut… more
Date: July 1, 1998
Creator: Jacobs, S. D.
Partner: UNT Libraries Government Documents Department
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