高电压技术2023，Vol.49Issue(12)：5228-5236,9.DOI:10.13336/j.1003-6520.hve.20221796
逃逸电子对纳秒短脉冲大气压空气击穿的影响
Effect of Runaway Electrons on the Breakdown of Nanosecond Short Pulse in Atmospheric Air
李雨泰 1刘志刚 1付洋洋 1邹晓兵 1王新新1
作者信息
- 1. 清华大学电机工程与应用电子技术系,北京 100084
- 折叠
摘要
Abstract
Because the classical streamer discharge theory is difficult to explain the rapid breakdown of gas under nano-second short pulse voltage,the runaway electron breakdown theory is proposed.In order to help understand the theory of runaway electron breakdown,this paper first gives a brief introduction of its development history,and then presents our PIC/MCC simulation results for nanosecond short pulse discharge in atmospheric air.Under negative polarity,with the increase of breakdown voltage,the evolution of runaway electrons from nothing was observed,and sufficient conditions for the generation of runaway electrons were proposed.The pre-ionization channel generated by runaway electron in front of discharge channel head was found and its important role in the rapid breakdown of air gap was indicated.The time re-quired for the channel to cross the air gap under the positive and negative 26 kV breakdown voltage was compared,and the polarity effect reversal of the breakdown voltage was explained.It is found that the highest energy electrons only ap-pear in the strong electric field area at the head of the discharge channel.Even if the electric field there exceeds the critical value,it is difficult for the electrons to enter the continuous acceleration mode.Therefore,the energy of the highest energy electrons is much smaller than that in the negative polarity.Finally,the contribution of high-energy electrons to the rapid breakdown of the air gap is pointed out.关键词
纳秒脉冲/气体击穿/逃逸电子/脉冲放电/极性效应Key words
nanosecond pulse/gas breakdown/runaway electron/pulsed discharge/poolarity effect引用本文复制引用
李雨泰,刘志刚,付洋洋,邹晓兵,王新新..逃逸电子对纳秒短脉冲大气压空气击穿的影响[J].高电压技术,2023,49(12):5228-5236,9.
