强激光与粒子束2013，Vol.25Issue(4)：950-958,9.DOI:10.3788/HPLPB20132504.0950
高功率微波沿面闪络击穿机制粒子模拟
PIC simulation of mechanism of high power microwave flashover and breakdown on dielectric surface
摘要
Abstract
For investigating the mechanism of high power microwave flashover and breakdown on dielectric surface, the theoretical modeling is put forward, including dynamic equations, particle-in-cell method, secondary emission and Monte-Carlo collision between electrons and gas atoms. Based on the theoretical model, the 1D3V PIC-MCC code is programmed. By using this code, we numerically study vacuum multipactor discharge, volume breakdown under high-pressure gas and surface breakdown under low-pressure gas course, including the number of electrons and ions, electron trajectories, electron and ion density distributions, the time and space distribution of space charge field, the average electron energy, the average energy of impact electrons, the number of impact electrons, electron energy distribution functions, average secondary emission ratio and energy balance. The numerical results are concluded as follows: vacuum multipactor could not cause breakdown for low deposited power (about 1% microwave power); volume breakdown is caused by high-level number of electrons with low energy, the breakdown position is far from dielectric surface, and the forming time is at the level of microseconds; flashover and breakdown on dielectric surface are caused by the continuous increase of deposited power resulting from many high-energy electrons, the breakdown position is near to dielectric surface, and the forming time is at the level of nanoseconds.关键词
高功率微波/介质沿面闪络击穿/二次电子倍增/蒙特卡罗碰撞/粒子模拟Key words
high power microwave/ flashover and breakdown on dielectric surface/ multipactor discharge/ Monte Carlo collision/ PIC simulation分类
数理科学引用本文复制引用
董烨,周前红,董志伟,杨温渊,周海京,孙会芳..高功率微波沿面闪络击穿机制粒子模拟[J].强激光与粒子束,2013,25(4):950-958,9.基金项目
中国工程物理研究院科学技术发展基金项目(2012B0402064,2009B0402046) （2012B0402064,2009B0402046）
国家高技术发展计划项目 （）
国家自然科学基金项目(11105018) （11105018）
