空心阴极类火花放电初始电离过程的PIC/MCC模拟

The initiation phase of pseudospark discharge in a hollow cathode via PIC/MCC simulation

采用粒子模拟与蒙特卡罗相结合(PIC/MCC)的方法,应用静电模型,编写了准三维的模拟程序.该程序能够较好地描述空心阴极类火花放电初始电离过程的演化步骤.通过研究电离过程的细节,可以认为该阶段电离过程是空心阴极效应和局部强电场共同作用的结果.从起始电离到空心阴极初始阶段,局部强电场在电离过程中起到了支配作用;随后空心阴极效应占据主导地位.

We have developed a theoretical and computational model to study the initiation phase of pseudospark discharges in a hollow cathode via a quasi-three-dimensional electrostatic particle-in-cell plus Monte Carlo collision（PIC/MCC） method. The numerical results clearly identified different processes of ionization growth. It has been found that the ionization processes are determined by hollow cathode effect and local electric field. The growth is dependent on a ionization multiplication due to local space charge in the stage from initial ionization growth to the onset of the hollow cathode effect, and then the hollow cathode effect becomes the leading factor.