等离子体开关器件电极设置的基础模拟分析

Fundamental Simulation Analysis on Electrode Settings of Plasma Switch Device

利用Xoopic软件,采用有限时域差分(FDTD)和YEE网格法,对所设计的冷阴极交叉场等离子体调制开关的工作过程进行了数值模拟,模拟分析了源栅极和控制栅极的相对电位、源栅极和控制栅极的相对位置、以及电磁场分布等因素对预电离的产生和预电离区域稳定性的影响,同时也着重模拟分析了阴极材料的二次发射系数、二次发射程度、电磁场分布等因素对开关通导及其过程稳定性的影响,确定了影响系统放电状态、点火时间和对脉冲电流峰值有效调制的因素,得到了当栅极透明度为0.5,两栅极半径之比小于0.9时,控制栅极能对器件的通断起到有效控制的结论。

The active process of cold cathode cross-field plasma modulation switch has been simulated by Xoopic software with FDTD and YEE meshing method.Particular emphasis is laid on the analysis of the emergence of preionization and stability of preionization region which are influenced by electric potential difference between source grid and control grid,relative position of two grids,and distribution of electrical magnetic field.This paper also analyze the influence of the secondary emission coefficient and secondary emission level of cathode materials,and electromagnetic field distribution on the introduction and working process stability of switch.The factors influence the discharge status of ignition time of the system and effective modulation of peak pulse current are determined.It is also known that if the radio of the two grids radius is less than 0.9,the control grid can play an effective role in the control for working process of the switching device.