喷气Z箍缩内爆动力学过程的数值模拟研究

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

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箍缩内爆过程的“拉链”(zippering)效应也进行了分析计算 .

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.