气体火花开关初始放电等离子体演化过程北大核心CSCD

气体火花开关的初始放电过程对研究其工作状态有着非常重要的影响,通过基于网格粒子法-直接蒙特卡罗法(PIC-DSMC)耦合算法模拟了气体火花开关从放电开始到等离子体通道初步形成的完整过程,得到了电子和离子的数密度时空分布变化,分析了间隙中电场分布随时间变化规律,完整清晰地揭示了气体火花开关从放电初始到等离子体通道初步形成的物理过程,并初步开展了气体火花开关击穿过程的光学诊断实验,为进一步深入研究气体火花开关的物理机理打下了基础。

Plasma evolution of initial discharge in gas spark gap

It is important to study initial discharge for researching operating process in gas spark gap. The whole initial discharge process in gas spark gap was simulated in this paper by PIC-DSMC code. The evolutions of electron density distribution and ion density distribution were obtained, the electric field distribution in the gap was analyzed, and the process from electron emission to plasma channel was presented. Finally, the gas spark gap discharge experiment was performed with high speed camera. This is basis for further researching on physics mechanism of the gas spark gap.