四阳极直流辉光放电正柱区数值分析

分析了具有中间开窗电极四阳极直流辉光放电装置的氦气放电中阴极与较近阳极间放电正柱区的电子密度、电子温度和等离子体碰撞频率, 及其空间分布随放电气压变化规律。结果表明电子密度在径向上呈类似于抛物线的分布, 而碰撞频率和电子温度在整个放电管内近似均匀分布。探讨了不锈钢阳极座和矩形窗口对这些参数的影响, 为进一步进行装置仿真和实验研究提供参考。

Theoretical investigation for the positive column of the four-anode DC glow discharges

In helium DC glow discharges in the four-anode device with a rectangle window in the center of each electrode,the radial behaviors of the electron densities, the temperatures of electrons and the plasma collision frequencies in the positive column among the cathode and two adjacent anodes are analyzed, as well as their change in profile with pressure. Results show that the radial electron profile is about parabolic, and the collision frequencies and electron temperatures are homogeneous in the whole discharge tube. The effects of stainless steel anode-seats and rectangle widows on above parameters are discussed. The results provide a reference for further simulation and experiment.