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Shock structuring due to fabrication joints in targets

Phys. Plasmas 6, 3327 (1999); doi:10.1063/1.873572

Issue Date: August 1999

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S. R. Goldman, S. E. Caldwell, M. D. Wilke, D. C. Wilson, Cris W. Barnes, W. W. Hsing, N. D. Delamater, G. T. Schappert, J. W. Grove, E. L. Lindman, J. M. Wallace, and R. P. Weaver
Los Alamos National Laboratory, Los Alamos, New Mexico 87545

A. M. Dunne, M. J. Edwards, P. Graham, and B. R. Thomas
Atomic Weapons Establishment, Aldermaston, Reading, RG7 4PR, United Kingdom
The use of copper-doped beryllium ablators on National Ignition Facility [J. A. Paisner et al., Laser Focus World 30, 75 (1994)] targets, in place of plastic, can require the bonding together of hemispheres with a joint of differing composition. Indirect drive experiments have been conducted on the Nova laser [J. L. Emmet, W. F. Krupke, and J. B. Trenholme, Sov. J. Quantum Electron. 13, 1 (1983)], and the resulting shock structuring compared with code simulations. It is concluded that one of the available codes, the RAGE code [R. M. Baltrusaitis et al., Phys. Fluids 8, 2471 (1996)] provides useful insight into the effect of joints. This code is then employed to obtain a physical picture of the shock front nonuniformity in terms of a secondary rarefaction and an oblique shock interacting with the main shock that propagates in the absence of the joint. A simple analysis reinforces this picture.©1999 American Institute of Physics.
History: Received 22 October 1998; accepted 30 April 1999
Permalink: http://link.aip.org/link/?PHPAEN/6/3327/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.50.Lp
    Physics of plasmas and electric discharges Plasma production and heating Plasma production and heating by shock waves and compression
  • 52.65.-y
    Physics of plasmas and electric discharges Plasma simulation
  • YEAR: 1999

PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
Publisher:
AIP is a member of CrossRef AIP

REFERENCES (22)
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  19. Two-dimensional Lasnex calculations indicate that the usage of gray in place of multi-group opacities introduces an incremental lag of order 1–2 µm in the shock front position near the joint without a qualitative effect on the shape of the shock front structuring.
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