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Title: Observation of reduced beam deflection using smoothed beams in gas-filled hohlraum symmetry experiments at Nova

Abstract

Execution and modeling of drive symmetry experiments in gas-filled hohlraums have been pursued to provide both a better understanding of radiation symmetry in such hohlraums and to verify the accuracy of the design tools which are used to predict target performance for the National Ignition Facility (NIF) [J. Lindl, Phys. Plasmas 2, 3933 (1995)]. In this paper, the results of a series of drive symmetry experiments using gas-filled hohlraums at the Nova laser facility [C. Bibeau et al., Appl. Opt. 31, 5799 (1992)] at Lawrence Livermore National Laboratory are presented. A very important element of these experiments was the use of kineform phase plates (KPP) to smooth the Nova beams. The effect of smoothing the ten Nova beams with KPP phase plates is to remove most of the beam bending which had been observed previously, leaving a residual bending of only 1.5 degree sign , equivalent to a 35 {mu}m pointing offset at the hohlraum wall. The results show that the symmetry variation with pointing of implosions in gas-filled hohlraums is consistent with time integrated modeling. (c) 2000 American Institute of Physics.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Publication Date:
OSTI Identifier:
20216039
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; INERTIAL CONFINEMENT; PLASMA SIMULATION; LASER FUSION REACTORS; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Delamater, N. D., Lindman, E. L., Magelssen, G. R., Failor, B. H., Murphy, T. J., Hauer, A. A., Gobby, P., Moore, J. B., Gomez, V., and Gifford, K. Observation of reduced beam deflection using smoothed beams in gas-filled hohlraum symmetry experiments at Nova. United States: N. p., 2000. Web. doi:10.1063/1.873982.
Delamater, N. D., Lindman, E. L., Magelssen, G. R., Failor, B. H., Murphy, T. J., Hauer, A. A., Gobby, P., Moore, J. B., Gomez, V., & Gifford, K. Observation of reduced beam deflection using smoothed beams in gas-filled hohlraum symmetry experiments at Nova. United States. doi:10.1063/1.873982.
Delamater, N. D., Lindman, E. L., Magelssen, G. R., Failor, B. H., Murphy, T. J., Hauer, A. A., Gobby, P., Moore, J. B., Gomez, V., and Gifford, K. Mon . "Observation of reduced beam deflection using smoothed beams in gas-filled hohlraum symmetry experiments at Nova". United States. doi:10.1063/1.873982.
@article{osti_20216039,
title = {Observation of reduced beam deflection using smoothed beams in gas-filled hohlraum symmetry experiments at Nova},
author = {Delamater, N. D. and Lindman, E. L. and Magelssen, G. R. and Failor, B. H. and Murphy, T. J. and Hauer, A. A. and Gobby, P. and Moore, J. B. and Gomez, V. and Gifford, K.},
abstractNote = {Execution and modeling of drive symmetry experiments in gas-filled hohlraums have been pursued to provide both a better understanding of radiation symmetry in such hohlraums and to verify the accuracy of the design tools which are used to predict target performance for the National Ignition Facility (NIF) [J. Lindl, Phys. Plasmas 2, 3933 (1995)]. In this paper, the results of a series of drive symmetry experiments using gas-filled hohlraums at the Nova laser facility [C. Bibeau et al., Appl. Opt. 31, 5799 (1992)] at Lawrence Livermore National Laboratory are presented. A very important element of these experiments was the use of kineform phase plates (KPP) to smooth the Nova beams. The effect of smoothing the ten Nova beams with KPP phase plates is to remove most of the beam bending which had been observed previously, leaving a residual bending of only 1.5 degree sign , equivalent to a 35 {mu}m pointing offset at the hohlraum wall. The results show that the symmetry variation with pointing of implosions in gas-filled hohlraums is consistent with time integrated modeling. (c) 2000 American Institute of Physics.},
doi = {10.1063/1.873982},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 7,
place = {United States},
year = {2000},
month = {5}
}