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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. We report on the results of a series of experiments performed at the Nova laser facility at Lawrence Livermore National Laboratory with the goal of understanding time dependent drive symmetry in gas filled hohlraums. Time dependent symmetry data from implosions in gas filled hohlraums will be discussed. The purpose of filling the hohlraum with gas is to tamp the motion of the high-{ital Z} material ablating from the hohlraum walls, reducing the motion of the laser deposition regions and resultant temporal variations in drive symmetry. We have obtained time integrated and time resolved x-ray images of the implosion of plastic deuterium filled capsules, neutron yields, implosion times and spectroscopy of argon emission from the imploded core. Preliminary results show that the gas is effective in impeding the motion of the wall blowoff material, and that the resulting implosion is in qualitative agreement with modeling. These experiments are relevant to those currently being planned for the National Ignition Facility. {copyright} {ital 1996 American Institute of Physics.}

Authors:
 [1];  [2];  [1];  [2];  [3]; ; ;  [1]; ; ;  [2]; ;  [1]; ; ;  [2];  [4];  [2]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
  2. Lawrence Livermore National Laboratory, Livermore, California 94551 (United States)
  3. Centre D`Etudes De Limeil-Valenton (France)
  4. General Atomics, San Diego, California (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory
OSTI Identifier:
397209
Report Number(s):
CONF-950476-
Journal ID: APCPCS; ISSN 0094-243X; TRN: 96:029286
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 369; Journal Issue: 1; Conference: 12. international conference on laser interaction and related plasma phenomena, Osaka (Japan), 24-28 Apr 1995; Other Information: PBD: May 1996
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION; INERTIAL CONFINEMENT; LASER TARGETS; DEUTERIUM TARGET; THERMONUCLEAR REACTIONS; THERMONUCLEAR IGNITION; LASER IMPLOSIONS; X-RAY DETECTION; IMAGES; FUSION YIELD

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, Powers, L V, Pollaine, S M, Suter, L J, Chrien, R, Harris, D B, Nelson, M B, Cable, M D, Moore, J B, Gifford, K, and Wallace, R J. Symmetry experiments in gas filled Hohlraums at Nova. United States: N. p., 1996. Web. doi:10.1063/1.50525.
Delamater, N D, Murphy, T J, Hauer, A A, Kauffman, R L, Richard, A L, Lindman, E L, Magelssen, G R, Wilde, B H, Powers, L V, Pollaine, S M, Suter, L J, Chrien, R, Harris, D B, Nelson, M B, Cable, M D, Moore, J B, Gifford, K, & Wallace, R J. Symmetry experiments in gas filled Hohlraums at Nova. United States. doi:10.1063/1.50525.
Delamater, N D, Murphy, T J, Hauer, A A, Kauffman, R L, Richard, A L, Lindman, E L, Magelssen, G R, Wilde, B H, Powers, L V, Pollaine, S M, Suter, L J, Chrien, R, Harris, D B, Nelson, M B, Cable, M D, Moore, J B, Gifford, K, and Wallace, R J. Wed . "Symmetry experiments in gas filled Hohlraums at Nova". United States. doi:10.1063/1.50525.
@article{osti_397209,
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 Powers, L V and Pollaine, S M and Suter, L J and Chrien, R and Harris, D B and Nelson, M B and Cable, M D and Moore, J B and Gifford, K and Wallace, R J},
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. We report on the results of a series of experiments performed at the Nova laser facility at Lawrence Livermore National Laboratory with the goal of understanding time dependent drive symmetry in gas filled hohlraums. Time dependent symmetry data from implosions in gas filled hohlraums will be discussed. The purpose of filling the hohlraum with gas is to tamp the motion of the high-{ital Z} material ablating from the hohlraum walls, reducing the motion of the laser deposition regions and resultant temporal variations in drive symmetry. We have obtained time integrated and time resolved x-ray images of the implosion of plastic deuterium filled capsules, neutron yields, implosion times and spectroscopy of argon emission from the imploded core. Preliminary results show that the gas is effective in impeding the motion of the wall blowoff material, and that the resulting implosion is in qualitative agreement with modeling. These experiments are relevant to those currently being planned for the National Ignition Facility. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.50525},
journal = {AIP Conference Proceedings},
number = 1,
volume = 369,
place = {United States},
year = {1996},
month = {5}
}