空腔靶激光能量沉积的数值模拟  

NUMERICAL SIMULATION OF LASER ENERGY DEPOSITION IN CAVITY TARGETS

作　　者：朱森昌[1] 常铁强[1] 

机构地区：[1]北京应用物理与计算数学研究所

出　　处：《强激光与粒子束》1989年第2期145-152,共8页High Power Laser and Particle Beams

摘　　要：本文采用随机模拟方法和几何光学追踪方法。研究了不同条件下空腔靶中的激光传播光路:采用线性收缩假设,考虑了激光入射时注入孔的堵口问题 激光在等离子体中吸收的物理机制,包括了逆韧致吸收和共振吸收,还考虑了反向布里渊散射对吸收的影响。在此基础上,改变靶的不同尺寸,计算了不同激光入射条件下激光能量在腔内的沉积。Supposing that the space and time distributions of laser beam were Gus-sian. We selected the parameters of the laser beam that was traced using the Monte Carlo method and a beam-tracing method. According to some experimental data and theoretical considerations, the effect of the entrance hole closure was also calculated with an assumption of a constant closing velocity. To calculate the laser absorption in plasmas, the effect of Back-Brillouin scattering was also considered besides inverse brems-strahlung and resonant absorption. On this basis we developed the laser absorption code for cavity targets. Using the cade, we calculated the absorption and scattering of incident laser beams in cavity targets. In this paper, the method and results are discussed.

关 键 词：空腔靶 激光 能量沉积 数值模拟 

分 类 号：TN248.01[电子电信—物理电子学]