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Analysis of rippled shock-wave propagation and ablation-front stability by theory and hydrodynamic simulation

Published online by Cambridge University Press:  01 January 1999

N. MATSUI ,
K. MIMA ,
M. HONDA  and
A. NISHIGUCHI
N. MATSUI
Affiliation:
Institute of Laser Engineering, Osaka University, 2–6 Yamada-Oka, Suita, Osaka, 565-0871 Japan
K. MIMA
Affiliation:
Institute of Laser Engineering, Osaka University, 2–6 Yamada-Oka, Suita, Osaka, 565-0871 Japan
M. HONDA
Affiliation:
Institute of Laser Engineering, Osaka University, 2–6 Yamada-Oka, Suita, Osaka, 565-0871 Japan
A. NISHIGUCHI
Affiliation:
Institute of Laser Engineering, Osaka University, 2–6 Yamada-Oka, Suita, Osaka, 565-0871 Japan Present address: Osaka Institute of Technology, Omiya Asahi-ku, Osaka, 535 Japan.
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Abstract

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The hydrodynamic start-up problem is one of the most crucial issues in laser-driven symmetrical implosion. The target-surface roughness and initial imprint by nonuniform laser irradiation result in Rayleigh–Taylor instability in the acceleration and deceleration phase. To estimate the tolerance of the target-surface roughness, the temporal behaviour of corrugated ablation surface and rippled shock-wave propagation are investigated using a perturbation analysis of the fluid equation, which is solved under the boundary model of a fire-polished ablation surface. The results show good agreement with two- dimensional hydrodynamic simulation and experimental results [T. Endo et al., Phys. Rev. Lett.74, 3608 (1995)].

Type
Research Article
Information
Journal of Plasma Physics , Volume 61 , Issue 1 , January 1999 , pp. 43 - 50
Copyright
© 1999 Cambridge University Press