计算物理 ›› 2000, Vol. 17 ›› Issue (S1): 113-120.DOI: 10.3969/j.issn.1001-246X.2000.01.020

• 论文 • 上一篇    下一篇

激光在高温等离子体中的成丝不稳定性数值模拟

陈志华, 俞汉清, 屠琴芬   

  1. 西北核技术研究所, 陕西 西安 710024
  • 收稿日期:1999-08-05 修回日期:1999-10-08 出版日期:2000-12-25 发布日期:2000-12-25
  • 作者简介:陈志华(1971~),男,湖北鄂山,硕士生,土要从事激光与等离子体的研究
  • 基金资助:
    国家863高技术惯性约束聚变资助(863-416-6)

NUMERICAL SIMULATING OF THE LASER FILAMENTATION IN HIGHTEMPERATURE PLASMA

CHEN Zhi-hua, YU Han-qing, TU Qin-fen   

  1. Northwest Institute of Nuclear Technology, Xi'an, 710024, P R China
  • Received:1999-08-05 Revised:1999-10-08 Online:2000-12-25 Published:2000-12-25

摘要: 简要介绍激光-靶耦合中,二维(y,z)、三维(x,y,z)成丝不稳定性数值模拟方法及计算结果。该方法包括非局域热传导和Landau阻尼。二维(y,z)成丝过程的发展与一维双温单流体力学计算同步耦合,成丝的零级量由一维双温单流体力学计算提供。三维(x,y,z)成丝的模拟采用固定时刻的零级量为背景进行计算。成丝过程的发展除与成丝背景有关外,还与扰动波长、入射激光强度、激光波长等有关。计算结果表明:成丝不稳定的产生和发展,将严重影响光束质量,应进一步深入、系统地研究。

关键词: 成丝, 低密度等离子体, 数值模拟

Abstract: Abstract] 2-D and 3-D numerical simulation methods of filamentation instability in laser-target interaction are presented.The Landau-fluid models are adopted with a simplified 3-D numerical method,it simulates filamentation process for laser beams in underdense plasma.Plasma background resulted by 1D simultaneously calculation of the laser-target coupling is used to investigate the filamentation process and several reasonable results have been obtained.Nonlinear and relativistic modification of transport coefficients,and nonlinear hydrodynamics computation prove to be needed for the case of intense laser beams.

Key words: filamentation, underdense plasma, numerical simulation

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