【摘要】 本文叙述用一维非平衡辐射流体力学激光打靶程序模拟计算高功率密度(～10¹³W/cm²)激光照射中Z介质薄靶形成的等离子体状态。考虑的物理过程有轫致、光电离、电子碰撞电离及它们的逆过程,Compton散射过程等。Compton散射采用Fokker-Planck近似;电子和离子热传导采用限流扩散近拟;光子方程采用多群限流扩散近似;用平均原子模型计算布居数。激光的吸收主要考虑逆轫致吸收。 用功率密度分别为5×10¹³W/cm²和1×10¹⁴W/cm²,波长0.53μm,脉宽450ps的激光从两面和单面打se薄靶,模拟计算结果与国外的实验结果一致。更多还原

【Abstract】 In this paper we used one-dimentional non-LTE laser irradiated code to simulate the laser-produced plasmas conditions of thin middle Z targets with high intensities(about 1013W/cm2)irradiation.Following physical processes are considered; bremsstrahlung,radiative ionization,collisional ionization by electrons and their inverse processes, Compton scatterion. Fokker-Planck approximtaion is used in Compton scattering; The thermal flux limits are taken for electrons and ions in the calculating and the multigroup flux-limited diffusion approximation is taken for the radiative transport equations.Using average-atom model to calculate the population probabilities of atoms. Laser absorption via inverse bresstr-ahlung is considered to be the most important in our simulation.Using, laser beams with intensities 5×1013W/cm2 and 1 ×1014 W/cm2, λL= 0.53μm, τ= 450ps to irradiate thin Se target from single-side and double-sides separately, the computational results for laser-produced plasmas conditions are good agree with experimental results.更多还原