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Title: Computer simulations of laser hot spots and implosion symmetry kiniform phase plate experiments on Nova

Abstract

LASNEX computer code simulations have been performed for radiation symmetry experiments on the Nova laser with vacuum and gas-filled hohlraum targets [R. L. Kauffman et al., Phys. Plasmas 5, 1927 (1998)]. In previous experiments with unsmoothed laser beams, the symmetry was substantially shifted by deflection of the laser beams. In these experiments, laser beams have been smoothed with Kiniform Phase Plates in an attempt to remove deflection of the beams. The experiments have shown that this smoothing significantly improves the agreement with LASNEX calculations of implosion symmetry. The images of laser produced hot spots on the inside of the hohlraum case have been found to differ from LASNEX calculations, suggesting that some beam deflection or self-focusing may still be present or that emission from interpenetrating plasmas is an important component of the images. The measured neutron yields are in good agreement with simulations for vacuum hohlraums but are far different for gas-filled hohlraums. (c) 2000 American Institute of Physics.

Authors:
 [1];  [2];  [2];  [2]
  1. Fusion Technology Institute, University of Wisconsin-Madison, 1500 Engineering Drive, Madison, Wisconsin 53706 (United States)
  2. Los Alamos National Laboratory, MS B220, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216037
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; NOVA FACILITY; COMPUTERIZED SIMULATION; PLASMA SIMULATION; IMPLOSIONS; HOT SPOTS; LASER RADIATION; LASER FUSION REACTORS; THEORETICAL DATA

Citation Formats

Peterson, R. R., Lindman, E. L., Delamater, N. D., and Magelssen, G. R. Computer simulations of laser hot spots and implosion symmetry kiniform phase plate experiments on Nova. United States: N. p., 2000. Web. doi:10.1063/1.873974.
Peterson, R. R., Lindman, E. L., Delamater, N. D., & Magelssen, G. R. Computer simulations of laser hot spots and implosion symmetry kiniform phase plate experiments on Nova. United States. doi:10.1063/1.873974.
Peterson, R. R., Lindman, E. L., Delamater, N. D., and Magelssen, G. R. Mon . "Computer simulations of laser hot spots and implosion symmetry kiniform phase plate experiments on Nova". United States. doi:10.1063/1.873974.
@article{osti_20216037,
title = {Computer simulations of laser hot spots and implosion symmetry kiniform phase plate experiments on Nova},
author = {Peterson, R. R. and Lindman, E. L. and Delamater, N. D. and Magelssen, G. R.},
abstractNote = {LASNEX computer code simulations have been performed for radiation symmetry experiments on the Nova laser with vacuum and gas-filled hohlraum targets [R. L. Kauffman et al., Phys. Plasmas 5, 1927 (1998)]. In previous experiments with unsmoothed laser beams, the symmetry was substantially shifted by deflection of the laser beams. In these experiments, laser beams have been smoothed with Kiniform Phase Plates in an attempt to remove deflection of the beams. The experiments have shown that this smoothing significantly improves the agreement with LASNEX calculations of implosion symmetry. The images of laser produced hot spots on the inside of the hohlraum case have been found to differ from LASNEX calculations, suggesting that some beam deflection or self-focusing may still be present or that emission from interpenetrating plasmas is an important component of the images. The measured neutron yields are in good agreement with simulations for vacuum hohlraums but are far different for gas-filled hohlraums. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.873974},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 7,
place = {United States},
year = {2000},
month = {5}
}