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Title: Hohlraum energetics with smoothed laser beams

Abstract

Measurements of radiation temperatures from empty and gas-filled hohlraums heated at the Nova Laser Facility [E. M. Campbell et al., Laser Part. Beams 9, 209 (1991)] show efficient coupling of the laser power to the target when applying laser beam smoothing techniques. Scattering losses are reduced to the 3% level while the radiation temperatures increased by {approx}15 eV for smoothed laser beams. The experimental findings and supporting calculations indicate that filamentation and gain for stimulated Raman and Brillouin scattering is suppressed in the hohlraum plasma for smoothed laser beams. The scaling of the radiation temperature is well described by integrated radiation hydrodynamic LASNEX modeling [G. B. Zimmerman and W. L. Kruer, Comments Plasma Phys. Controlled Fusion 2, 85 (1975)] following the Marshak scaling. Peak radiation temperatures are in excess of 230 eV in gas-filled hohlraums in agreement with the detailed LASNEX modeling. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. L-437, Lawrence Livermore National Laboratory, University of California, P.O. Box 808, California 94551 (United States)
  2. L-437, Lawrence Livermore National Laboratory, University of California, P.O. Box 808, California 94551 (United States) (and others)
Publication Date:
OSTI Identifier:
20216549
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 6; Other Information: PBD: Jun 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; NOVA FACILITY; LASER-PRODUCED PLASMA; TEMPERATURE MEASUREMENT; RADIATION TRANSPORT; LASER TARGETS; COUPLING; LASER FUSION REACTORS; BRILLOUIN EFFECT; RAMAN EFFECT; LIGHT SCATTERING; EXPERIMENTAL DATA

Citation Formats

Glenzer, S. H., Suter, L. J., Berger, R. L., Estabrook, K. G., Hammel, B. A., Kauffman, R. L., Kirkwood, R. K., MacGowan, B. J., Moody, J. D., and Rothenberg, J. E. Hohlraum energetics with smoothed laser beams. United States: N. p., 2000. Web. doi:10.1063/1.874100.
Glenzer, S. H., Suter, L. J., Berger, R. L., Estabrook, K. G., Hammel, B. A., Kauffman, R. L., Kirkwood, R. K., MacGowan, B. J., Moody, J. D., & Rothenberg, J. E. Hohlraum energetics with smoothed laser beams. United States. doi:10.1063/1.874100.
Glenzer, S. H., Suter, L. J., Berger, R. L., Estabrook, K. G., Hammel, B. A., Kauffman, R. L., Kirkwood, R. K., MacGowan, B. J., Moody, J. D., and Rothenberg, J. E. Thu . "Hohlraum energetics with smoothed laser beams". United States. doi:10.1063/1.874100.
@article{osti_20216549,
title = {Hohlraum energetics with smoothed laser beams},
author = {Glenzer, S. H. and Suter, L. J. and Berger, R. L. and Estabrook, K. G. and Hammel, B. A. and Kauffman, R. L. and Kirkwood, R. K. and MacGowan, B. J. and Moody, J. D. and Rothenberg, J. E.},
abstractNote = {Measurements of radiation temperatures from empty and gas-filled hohlraums heated at the Nova Laser Facility [E. M. Campbell et al., Laser Part. Beams 9, 209 (1991)] show efficient coupling of the laser power to the target when applying laser beam smoothing techniques. Scattering losses are reduced to the 3% level while the radiation temperatures increased by {approx}15 eV for smoothed laser beams. The experimental findings and supporting calculations indicate that filamentation and gain for stimulated Raman and Brillouin scattering is suppressed in the hohlraum plasma for smoothed laser beams. The scaling of the radiation temperature is well described by integrated radiation hydrodynamic LASNEX modeling [G. B. Zimmerman and W. L. Kruer, Comments Plasma Phys. Controlled Fusion 2, 85 (1975)] following the Marshak scaling. Peak radiation temperatures are in excess of 230 eV in gas-filled hohlraums in agreement with the detailed LASNEX modeling. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.874100},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 6,
volume = 7,
place = {United States},
year = {2000},
month = {6}
}