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A method to determine the flux limiter via the motion of the M-band emission region in Au hohlraum

Published online by Cambridge University Press:  25 May 2012

Yiqing Zhao ,
Ke Lan ,
Peng Song ,
Wudi Zheng  and
Xin Li
Yiqing Zhao*
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
Ke Lan
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
Peng Song
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
Wudi Zheng
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
Xin Li
Affiliation:
Institute of Applied Physics and Computational Mathematics, Beijing, People's Republic of China
*
Address correspondence and reprint requests to: Yiqing Zhao, Institute of Applied Physics and Computational Mathematics, P.O. Box 8009-14, Beijing 100088, People's Republic of China. E-mail: [email protected]
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Abstract

In this paper, the influence of the electron flux limiter fe on hohlraum plasmas is studied by using the two-dimensional code LARED-H, and a method to experimentally determine fe via the motion of the M-band emission region in Au hohlraum is proposed. From our simulations, the limited free streaming flux may dominates the heat conduction in the regions with steep temperature gradient, including the laser deposition region, the flux-heated overcritical region, and the laser channel boundary between the hot laser plasmas and the surrounding radiation ablated plasmas, while these are important X-ray emission regions. Hence, the choosing of fe may influence the wall plasma expansion and the laser spot motion, and further influence the motion of the emission regions. From our study, the motion of the M-band (>1.5 keV) emission region is sensitive to fe when the limited free streaming flux dominates the heat conduction of the wall plasma expansion region, and so it is possible to determine fe via the motion of the M-band emission region. In this work, the model used in our simulations is taken from the wall and laser spot motion experiments done by Huser et al. (2009).

Keywords

Flux limiterHohlraumsPlasma expansion
Type
Research Article
Information
Laser and Particle Beams , Volume 30 , Issue 3 , September 2012 , pp. 387 - 396
Copyright
Copyright © Cambridge University Press 2012

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