Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine
Direct measurements of anode/cathode gap plasma in cylindrically imploding loads on the Z machine
复制标题
在 Z 机器上的圆柱形内爆负载中直接测量阳极/阴极间隙等离子体
作者：
A. Porwitzky;D. Dolan;M. Martin;G. Laity;R. Lemke;T. Mattsson
通过采用基于光子多普勒测速的等离子体诊断技术，我们直接观测到了圆柱形聚束脉冲功率靶负极/阴极间隙中的低密度等离子体。这种等离子体的到来与阳极和阴极之间的总电流损失和细微的功率流差异在时间上相关。密度在与电磁方程中的霍尔项相关的范围内，但在通常用于设计、分析和优化脉冲功率实验的磁流体动力学代码中缺乏这种物理特性。这项工作证明了传统的阻性磁流体力学之外的物理学对于设计脉冲功率目标和驱动器的重要性。
By deploying a photon Doppler velocimetry based plasma diagnostic, we have directly observed low density plasma in the load anode/cathode gap of cylindrically converging pulsed power targets. The arrival of this plasma is temporally correlated with gross current loss and subtle power flow differences between the anode and the cathode. The density is in the range where Hall terms in the electromagnetic equations are relevant, but this physics is lacking in the magnetohydrodynamics codes commonly used to design, analyze, and optimize pulsed power experiments. The present work presents evidence of the importance of physics beyond traditional resistive magnetohydrodynamics for the design of pulsed power targets and drivers.