纳秒脉冲气体放电机理探讨

 经典Townsend机理和流注理论是气体放电研究的基础，但在解释纳秒脉冲气体放电时均存在一定缺陷。基于经典气体放电理论，探讨纳秒脉冲气体放电机理，分析流注理论判据在纳秒脉冲气体放电中的有效性，解释纳秒脉冲下电子逃逸现象和基于电子逃逸的快速电离波击穿理论，仿真计算高能快电子的逃逸过程。结果认为基于高能量快电子的逃逸击穿将是可能解释纳秒脉冲下气体放电现象的依据。

Review on nanosecond-pulse discharge mechanism in gases

Both Townsend theory and the traditional streamer model are the basis for study on gas discharge, however, they both have drawbacks dealing with nanosecond pulse gas breakdown. Based on the traditional mechanisms, the paper summarizes nanosecond pulse breakdown mechanisms in gases, presents some analyses on the validity of streamer criterion in the range of nanosecond pulse, describes the phenomenon of electron runaway and the theory of fast ionization wave breakdown, and gives some simulation calculations about runaway process of high-energy fast electrons. The results show that the runaway breakdown model induced by high-energy fast electrons is promising as accounting for the nanosecond pulse discharge in gases.