激光在高温等离子体中的成丝不稳定性数值模拟

NUMERICAL SIMULATING OF THE LASER FILAMENTATION IN HIGHTEMPERATURE PLASMA

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。

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. [