喷气Z箍缩内爆动力学过程的数值模拟研究

在分析了喷气Z箍缩内爆等离子体物理过程的基础上，作了必要的假定和简化，给出了物理模型和相应的数学方程组.研制了一维三温辐射磁流体动力学的数值模拟程序，对氖喷气Z箍缩内爆产生高温高密度等离子体过程进行了总体数值模拟，得到了等离子体各参量在内爆过程中的时空分布，再现了该内爆动力学整体过程，并与GAMBLE-Ⅱ装置的实验结果进行了比较.计算结果表明，在对热传导系数和等离子体电阻率作适当调整后，得到的计算结果是自洽的，其中内爆到心时刻、x射线辐射脉冲的脉宽和总能量等宏观量与实验结果比较接近.同时对喷气Z箍缩内爆过 关键词： 喷气Z箍缩 x射线辐射 辐射磁流体动力学

Numerical studies of neon gas-puff Z-pinch dynamic processes

Dynamic processes of neon gas-puff Z-pinch are studied numerically in this paper.A high temperature plasma with a high density can be generated in the process.Based on some physical analysis and assumption,a set of equations of one-dimensional Lagrangian radiation magneto-hydrodynamic (MHD) and its code are developed to solve the problem.Spatio-temporal distributions of plasma parameters in the processes are obtained,and their dynamic variations show that the major results are self-consistent.The duration for the plasma pinched to centre,as well as the width and the total energy of the x-ray pulse caused by the Z-pinch are in reasonable agreement with experimental results of GAMBLE-Ⅱ.A zipping effect is also clearly shown in the simulation.