虚火花放电初始过程的PIC模拟  

PIC Simulation of the Initial Discharge of a Pseudospark Discharge

作　　者：张红卫[1] 蒙林[2] 鄢杨[2] 于新华[2] 胡庆[2] 

机构地区：[1]南京航空航天大学金城学院,南京211156 [2]电子科技大学物电学院,成都610054

出　　处：《电子科技大学学报》2007年第5期927-930,共4页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金资助项目(60571078)

摘　　要：比较了两种计算气体放电的模型——流体模型和PIC模型。利用PIC方法对虚火花放电初始放电过程进行了计算机模拟,揭示了三个放电阶段电离增长的特点。对不同的气压和阴极孔径下虚阳极的形成时间和传播速度进行了模拟计算。较高的气压和较大的阴极孔径能够加速虚阳极的形成,并加快向空心阴极扩展速度。研究了较高气压和低气压下空心阴极效应在形成虚阳极过程中的作用。在低气压下,空心阴极效应在起始放电过程中具有重要作用。Two models used in computing gas discharge PIC model and fluid model are compared. The initial pseudospark discharge is simulated with PIC model and the properties of the three ionization growth regimes are presented. The virtual anode formation time and propagation velocity at different pressures with different cathode apertures are calculated. The formation of virtual anode is accelerated, as well as its propagation towards hollow cathode either at higher pressure or with larger-diameter aperture.The formation of virtual anode effected by hollow cathode is investigated at different pressures. The results show that the effect of hollow cathode plays a more important role in initial discharge at low pressure.

关 键 词：气体放电 空心阴极 PIC模拟 虚火花 虚阳极 

分 类 号：O53[理学—等离子体物理]