激光线聚焦驱动平面银靶的二维数值模拟

2D Simulation of an Ag Planar Target Driven by Focus-line Laser

介绍新研制的二维非平衡辐射流体力学程序XRL2D的物理方程以及计算方法,并对神光II上典型的类镍银X光激光实验条件,用3种ALE计算方法模拟了预主脉冲线聚焦驱动银平面靶的流体运动.几种方法模拟给出的物理图像清晰且相似,类镍离子丰度分布呈弯月形,同实验上XRL场图呈弯月形分布一致.对3种计算方法给出的结果进行了细致的比较分析.

Physical equations and calculation methods of XRL2D code, a 2D non-equilibrium radiation hydrodynamics code, are introduced. With this code, three different ALE methods are adopted to simulate hydrodynamic behavior of focus-line plasma of an Ag planar target driven by pre-main-pulse laser, which is a typical Ni-like Ag-ray laser experiment on ShenguangⅡ. The methods give similar and clear physical pictures： abundance distribution of Ni-like ion shows a shape of bow which agrees with distribution of XRL intensity in experiment. The methods are compared in detail as well.