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Long Ion Mean-Free Path and Nonequilibrium Radiation Effects on High-Aspect-Ratio Laser-Driven Implosions

Published online by Cambridge University Press:  09 March 2009

Takashi Yabe  and
Kazuo A. Tanaka
Takashi Yabe
Affiliation:
Department of Electronics, Gunma University, Tenjin-chou, Kiryu, Gunma 376, Japan
Kazuo A. Tanaka
Affiliation:
Institute of Laser Engineering, Osaka University, Yamada-Oka 2–6, Suita, Osaka 565
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Abstract

The implosion dynamics of experiments with high-aspect-ratio laser-driven targets are re-examined by taking account of long ion-mean-free paths. The mean-free path is found to be comparable to the fuel size and this can cause a significant departure from a fluid-like description. One of such effects stemming from the long ion-mean-free path; namely, real viscosity, seriously changes the results; the compression ratio becomes 5 times smaller with this real viscosity. In addition to this, inclusion of non-LTE (local thermodynamic equilibrium) atomic process is shown to critically determine the implosion dynamics because of bound-free opacity associated with a small fraction of hydrogen-like ions.

Type
Research Article
Information
Laser and Particle Beams , Volume 7 , Issue 2 , May 1989 , pp. 259 - 265
Copyright
Copyright © Cambridge University Press 1989

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