Z-pinch内爆等离子体时空分辨诊断技术

Time-space-resolved diagnostic technique for Z-pinch plasma investigation

为了深入认识和理解Z-pinch物理机制并对物理实验进行优化设计，需要研究内爆等离子体及其辐射的时空分布特性诊断技术，建立诊断装置与设备，通过实验研究等离子体内爆时间过程及其空间分布特性，利用所获得的实验诊断数据校核数值模拟程序。简要介绍近几年开展的X光空间积分功率谱测量、X光时间积分针孔照相、X光时分幅针孔照相、X光时间分辨1维空同分布、紫外探针阴影照相等时空分辨诊断技术研究工作，并给出在1～3MA电流驱动装置上进行的喷气和丝阵内爆实验中获得的部分时空分辨诊断结果，包括辐射功率、拉链速度、内爆速度、收缩比等。

In order to further understand the Z-pinch physical process and to optimize the experimental design, it is necessary to develop time-space-resolved diagnostic technique and corresponding equipments for investigation of imploding plasma and radiation distribution. Based on these diagnostic technique and equipments, experimental studies of plasma imploding process and spatial distribution can be conducted, which provide experimental verifications of numerical simulations. A brief summary of recent researches on the time-space-resolved diagnostic technique is given, including spatially integrated time-dependent X-ray power measurement, temporally integrated X-ray pinhole photography, X-ray framing photography, time-resolved 1D imaging, and plasma shadowgraph using UV laser probing. Typical experimental results obtained in gas-puff and wire-array experiments on 1 -3 MA facilities are also presented, including radiation power, zipper velocity, imploding velocity, convergence ratio, etc.