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in publisher: "Rochester Univ., NY United States. Lab. for Laser Energetics"  
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Laboratory for Laser Energetics annual report, 1 October 1991--30 September 1992. Inertial Fusion Program and National Laser Users Facility Program

Description: This is an annual report covering research progress on laser fusion and the OMEGA Upgrade design and development. In laser fusion, line-spectroscopy methods were demonstrated to be useful in diagnosing the core temperature and densities of polymer-shell targets; a theoretical analysis of nonlocal heat transport effects on filamentation of light in plasmas confirms that the principle mechanism driving filamentation is kinetic thermal rather than ponderomotive; a new method (spatial beam deflecti… more
Date: January 1, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laser-driven ICF experiments: Laboratory Report No. 223

Description: Laser irradiation uniformity is a key issue and is treated in some detail. The basic irradiation uniformity requirements and practical ways of achieving these requirements are both discussed, along with two beam-smoothing techniques: induced spatial incoherence (ISI), and smoothing by spectral dispersion (SSD). Experiments to measure and control the irradiation uniformity are also highlighted. Following the discussion of irradiation uniformity, a brief review of coronal physics is given, includ… more
Date: April 1, 1991
Creator: McCrory, R. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laser-driven ICF experiments: Laboratory Report No. 223

Description: Laser irradiation uniformity is a key issue and is treated in some detail. The basic irradiation uniformity requirements and practical ways of achieving these requirements are both discussed, along with two beam-smoothing techniques: induced spatial incoherence (ISI), and smoothing by spectral dispersion (SSD). Experiments to measure and control the irradiation uniformity are also highlighted. Following the discussion of irradiation uniformity, a brief review of coronal physics is given, includ… more
Date: April 1, 1991
Creator: McCrory, R. L.
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, January 2, 1992--June 30, 1993

Description: Our experimental efforts over the past 5 years have been aimed at cazrying out ICF shots with spin-polarized 0 fuel. We successfully prepared polarized 0 in HD, and solved the problems of loading target shells with our carefully prepared isotopic -rnixt.l.l?-es, polarizing them so that the 0 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 target is … 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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LLE Review, Quarterly Report: Volume 61, October-December 1994

Description: This volume of the LLE review, covering the period of October--December 1994, contains articles on a diagnostic method employing krypton spectroscopy for measurement of temperature and shell-fuel mixing in high-temperature implosions; the first direct assessment of the ion-acoustic decay instability in a large-scale length, hot plasma; measurements of polarization mode dispersion and group-velocity walkaway in birefringent media using a frequency domain interferometer; an evaluation of the magn… more
Date: December 31, 1994
Creator: Marshall, Kenneth L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laboratory for Laser Energetics annual report, 1 October 1991--30 September 1992

Description: This is an annual report covering research progress on laser fusion and the OMEGA Upgrade design and development. In laser fusion, line-spectroscopy methods were demonstrated to be useful in diagnosing the core temperature and densities of polymer-shell targets; a theoretical analysis of nonlocal heat transport effects on filamentation of light in plasmas confirms that the principle mechanism driving filamentation is kinetic thermal rather than ponderomotive; a new method (spatial beam deflecti… more
Date: January 1, 1993
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Charge collectors for the omega upgrade

Description: Charge collectors placed at several distances from the target measure the current of ions resulting from target disassembly and expansion, as a function of arrival time at the detector. Since the expanding plasma is neutral, comprising both electrons and ions moving together, the role of the charge collector is to separate out the electrons, so that the net ion current can be measured. The time-integrated current, or the total charge, can yield the total mass ablated from the target, provided t… more
Date: August 1, 1993
Creator: Yaakobi, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Stability analysis of unsteady ablation fronts

Description: The linear stability analysis of unsteady ablation fronts, is carried out for a semi-infinite uniform medium. For a laser accelerated target, it is shown that a properly selected modulation of the laser intensity can lead to the dynamic stabilization or growth-rate reduction of a large portion of the unstable spectrum. The theory is in qualitative agreement with the numerical results obtained by using the two-dimensional hydrodynamic code ORCHID.
Date: August 1, 1993
Creator: Betti, R.; McCrory, R. L. & Verdon, C. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

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.
Item Type: Refine your search to only Report
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.
Item Type: Refine your search to only Report
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.
Item Type: Refine your search to only Report
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.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 51, April-June 1992

Description: This volume of the LLE Review, covering the period April--June 1992, contains articles on laser-plasma interaction experiments in long-scale-length plasmas and on the theory of a new form of the stimulated Brillouin scattering instabilitity. The advanced technology section includes reports on the optical response of superconducting films, the development of high-reflectance transport mirrors for the OMEGA Upgrade, and a new high-brightness mono-mode laser oscillator. Finally, the activities of … more
Date: December 31, 1992
Creator: Short, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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LLE Review, Quarterly Report: Volume 48, July-September 1991

Description: This volume of the LLE Review, contains articles describing the results of imploding-target burnthrough experiments using smoothing by spectral dispersion (SSD), and a practical nonlocal model for electron transport in laser plasmas. The section on advanced technology includes a report on explosion fraction measurements of water-cooled xenon flashlamps, results on perfluorinated copolymer coatings for high-power laser applications, and a time-resolved study of surface disordering of Pb(110). A … more
Date: December 31, 1991
Creator: Jaanimagi, P. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

LLE Review, Quarterly Report: Volume 52, July-September 1992

Description: This volume of the LLE Review, covering the period July--September 1992, contains articles on methods of balancing the beam power on the OMEGA Upgrade and on the damping of ion-sound waves in laser-produced plasmas. The advanced technology section includes reports on optical nonlinearities in high-temperature superconductors, a method of increasing gas retention time for laser-fusion targets, and a study of stimulated Raman scattering of laser beams in air. Highlights of the research reported i… more
Date: December 31, 1992
Creator: Short, R. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

LLE Review, Quarterly Report: Volume 56, July-September 1993

Description: This volume of the LLE Review, covering the period July--September 1993, contains articles on self-focusing of broad-bandwidth laser light with angular dispersion, laser patterning of thin-film circuits, and construction of foam-shell fusion targets. Reports on the detailed designs of major subsystems of the OMEGA Upgrade and on the continuing activation of the upgraded Glass Development Laser system are summarized. Descriptions of research proposals for NLUF are also included in this issue. Hi… more
Date: December 31, 1993
Creator: Hutchison, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

LLE Review, Quarterly Report: Volume 53, October-December 1992

Description: This volume of the LLE Review covers the three-month period October--December 1992. On 18 December, the OMEGA Laser Facility fired its last shot. It will be decommissioned during the next quarter to make room for the OMEGA Upgrade Laser Facility. This volume deals with two areas of interest for the OMEGA Upgrade, the development of advanced x-ray and neutron diagnostics and the development of long-pulse (>1-ns) laser sources. The first three articles discuss the development of time-dependent di… more
Date: December 31, 1992
Creator: Meyerhofer, D. D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

LLE Review, Quarterly Report: Volume 57, October-December 1993

Description: During this quarter, the visible fruits of long design labors on the OMEGA Upgrade began to appear. The target mirror structure was put in place, along with the target chamber itself. The laser bay structures were also installed, and the bay is now being prepared to receive optomechanical, control, and laser assemblies. Further details are in the OMEGA Upgrade Status Report in this issue. Theory and analysis of previous experiments continued during this reporting period. Articles contained here… more
Date: December 31, 1993
Creator: Simon, A.
Item Type: Refine your search to only Report
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
Item Type: Refine your search to only Report
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
Item Type: Refine your search to only Report
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.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

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.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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