平板约束下激光诱导等离子体的动态仿真

为深入认识空间约束增强的物理机理,采用二维可压缩流体模型,建立平板约束下激光诱导等离子体动力学行为的数值模拟模型,计算了平板约束下等离子体的演化过程,得到的一系列时间分辨的温度分布结果与实验结果基本一致.揭示了平板约束下,反射激波对等离子体的压缩作用导致等离子体温度升高的机理.对不同激光能量和不同约束板间距对等离子体温度增强效果和增强时刻的影响进行了研究,两板间距增加,增强时刻明显延迟,等离子体温度的增强效果削弱.

Dynamic Simulation of Laser-produced Plasma under Plate Constraint

For further understanding the physical mechanism of space constraints,we used the two-dimensional compressible fluid model,established dynamic simulation of laser-produced plasma under plate constraint,and calculated the evolution of the plasma process under the plate constraint.A series of time-resolved temperature distribution results obtained are basically identical with the experimental results.The mechanism of plasma temperature increase caused by the compression effect of reflected shock wave under the constraint of flat plate is revealed.The effects of different laser energies and different spacing of restraint plates on the peak temperature and the peak time of plasma temperature were also studied.The distance between the two plates increases,the peak time is obviously delayed and the enhancement effect on plasma temperature is weakened.