丝阵Z箍缩X射线辐射机制数值分析

基于简化模型编写了结构简单、运行高效的Z箍缩计算程序，并已应用于阳加速器上开展的Z箍缩物理研究。在阳加速器和PTS的参数范围内进行了数值计算，结果表明:对于质量较轻的负载，激波加热是产生辐射的主要原因；对于质量较重的负载，辐射由激波加热和绝热压缩共同主导。激波加热功率与绝热压缩功率之比随丝阵质量增大而减小。烧蚀产生的先驱质量减弱激波加热，对峰值功率的提高不利，但这部分质量能抑制磁瑞利-泰勒不稳定性。因此综合激波加热和磁瑞利-泰勒不稳定性两方面的考虑，应该存在一个最优的烧蚀率。

Numerical analysis of X-ray radiation mechanism in wire array Z-pinch

An efficient total-variation-diminishing radiation magnetohydrodynamics code FOI-1a has been developed. Calculations with FOI have been performed with in the parameters range of Yang accelerator and PTS facility. Numerical results demonstrate that for light array the radiation at peak is dominated by shock heating, while for massive array by shock heating together with adiabatic compression. The ratio of shock heating to adiabatic compression decreases with increasing of array mass. Precursor plasma produced by ablation weakens shock heating and hence has a negative effect on peak radiation. However, precursor plasma has another stabilization effect on magnetic-Rayleigh-Taylor instability, so there should be an optimum ablation rate that maximizes the peak radiation.