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Title: Symmetry experiments in gas-filled hohlraums at NOVA

Abstract

Understanding drive symmetry in gas-filled hohlraums is currently of interest because the baseline design of the indirect drive ignition target for the planned National Ignition Facility uses a gas-filled hohlraum. This paper reports on the results of a series of experiments performed at the Nova laser [C. Bibeau {ital et} {ital al}. Appl. Opt. {bold 31}, 5799 (1992)] facility at Lawrence Livermore National Laboratory with the goal of understanding time-dependent drive symmetry in gas filled hohlraums. Time-dependent symmetry data from capsule implosions and reemission targets in gas-filled hohlraums are discussed. Results of symmetry measurements using thin wall gas-filled hohlraums are also discussed. The results show that the gas is effective in impeding the motion of the wall blowoff material, and that the resulting implosion performance of the capsule is not significantly degraded from vacuum results. The implosion symmetry in gas differs from vacuum results with similar laser pointing indicating a shift in beam position on the hohlraum wall and hotter drive at the capsule{close_quote}s poles than at the equator. A theory has been proposed to explain the observed shift as a plasma physics effect: beam steering due to filamentation and transverse plasma flows. {copyright} {ital 1996 American Institute of Physics.}

Authors:
; ;  [1];  [2];  [3]; ; ; ;  [1];  [4];  [1]; ; ;  [2];  [1];  [2];  [1]; ; ;  [2] more »; ;  [1];  [5] « less
  1. Los Alamos National Laboratory, MS E-526, Los Alamos, New Mexico 87545 (United States)
  2. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  3. Centre DEtudes De Limeil-Valenton (France)
  4. Physics International, San Leandro, California 94577 (United States)
  5. General Atomics, San Diego, California 85608 (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory
OSTI Identifier:
283727
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 3; Journal Issue: 5; Other Information: PBD: May 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; INDIRECT DRIVE LASER IMPLOSION; SYMMETRY; NOVA FACILITY; LASER FUSION REACTORS; LASER RADIATION; ICF DEVICES; ABLATION; LASER-PRODUCED PLASMA; BEAM-PLASMA SYSTEMS; GOLD; X RADIATION

Citation Formats

Delamater, N D, Murphy, T J, Hauer, A A, Kauffman, R L, Richard, A L, Lindman, E L, Magelssen, G R, Wilde, B H, Harris, D B, Failor, B A, Wallace, J, Powers, L V, Pollaine, S M, Suter, L J, Chrien, R, Shepard, T D, Rose, H A, Williams, E A, Nelson, M B, Cable, M D, Moore, J B, Salazar, M A, and Gifford, K. Symmetry experiments in gas-filled hohlraums at NOVA. United States: N. p., 1996. Web. doi:10.1063/1.871999.
Delamater, N D, Murphy, T J, Hauer, A A, Kauffman, R L, Richard, A L, Lindman, E L, Magelssen, G R, Wilde, B H, Harris, D B, Failor, B A, Wallace, J, Powers, L V, Pollaine, S M, Suter, L J, Chrien, R, Shepard, T D, Rose, H A, Williams, E A, Nelson, M B, Cable, M D, Moore, J B, Salazar, M A, & Gifford, K. Symmetry experiments in gas-filled hohlraums at NOVA. United States. doi:10.1063/1.871999.
Delamater, N D, Murphy, T J, Hauer, A A, Kauffman, R L, Richard, A L, Lindman, E L, Magelssen, G R, Wilde, B H, Harris, D B, Failor, B A, Wallace, J, Powers, L V, Pollaine, S M, Suter, L J, Chrien, R, Shepard, T D, Rose, H A, Williams, E A, Nelson, M B, Cable, M D, Moore, J B, Salazar, M A, and Gifford, K. Wed . "Symmetry experiments in gas-filled hohlraums at NOVA". United States. doi:10.1063/1.871999.
@article{osti_283727,
title = {Symmetry experiments in gas-filled hohlraums at NOVA},
author = {Delamater, N D and Murphy, T J and Hauer, A A and Kauffman, R L and Richard, A L and Lindman, E L and Magelssen, G R and Wilde, B H and Harris, D B and Failor, B A and Wallace, J and Powers, L V and Pollaine, S M and Suter, L J and Chrien, R and Shepard, T D and Rose, H A and Williams, E A and Nelson, M B and Cable, M D and Moore, J B and Salazar, M A and Gifford, K},
abstractNote = {Understanding drive symmetry in gas-filled hohlraums is currently of interest because the baseline design of the indirect drive ignition target for the planned National Ignition Facility uses a gas-filled hohlraum. This paper reports on the results of a series of experiments performed at the Nova laser [C. Bibeau {ital et} {ital al}. Appl. Opt. {bold 31}, 5799 (1992)] facility at Lawrence Livermore National Laboratory with the goal of understanding time-dependent drive symmetry in gas filled hohlraums. Time-dependent symmetry data from capsule implosions and reemission targets in gas-filled hohlraums are discussed. Results of symmetry measurements using thin wall gas-filled hohlraums are also discussed. The results show that the gas is effective in impeding the motion of the wall blowoff material, and that the resulting implosion performance of the capsule is not significantly degraded from vacuum results. The implosion symmetry in gas differs from vacuum results with similar laser pointing indicating a shift in beam position on the hohlraum wall and hotter drive at the capsule{close_quote}s poles than at the equator. A theory has been proposed to explain the observed shift as a plasma physics effect: beam steering due to filamentation and transverse plasma flows. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.871999},
journal = {Physics of Plasmas},
number = 5,
volume = 3,
place = {United States},
year = {1996},
month = {5}
}