金属目标表面气体放电单元放电过程的PIC-MCC模拟

 对目标表面的浮地导体边界的存在及其对单元气体放电过程所产生的影响进行了研究，针对导体边界条件，应用高斯定理和电荷守恒定律推导出这种边界条件的数值处理方法，得到了有界等离子体空间电势的数值分布。电场的数值计算表明，浮地导体的电势随着内部场的变化而变化，其大小介于两个电极的电势之间，对放电区域的电场分布产生较大的影响。 对金属目标表面放电单元的放电过程的PIC-MCC模拟结果表明， 浮地导体的存在能够改变放电空间的电场结构，形成不均匀场，有利于气体的电离和等离子体区域的形成，同时将使虚阳极所形成的电势平台在边界附近下陷，导致等离子体壳层的厚度变小。

PIC-MCC simulation of discharge cell fixed on metal object surface

Discharge cell fixed on metal objects surface has great application values,so it is necessary to study its discharge features.In this paper,the discharge process is simulated.To solve the float conductor boundary condition problem,a method is proposed by using charge conservation law and Gaussian law.It is found that the potential of float conductor is between the potential of anode and that of cathode and varies as the inner field of plasma region varies.Using PIC-MCC method,a simulation of the discharge process is successfully done.The results show that the existence of float conductor boundary changes the inner field structure,which is favorable for gas discharge as well as the formation of plasma region.Moreover,the float conductor forms a float electrode that drives away and shortens the potential platform produced by gas discharge,which results in the shrink of plasma shield.