阴极爆炸发射电子电离气体原初过程的动力学模拟

Dynamic simulations on initial process of the gas ionization by cathode explosive emission electrons

基于阴极爆炸发射电子和电子对气体的碰撞电离模型 ,用胞中粒子 (PIC)模拟方法对单间隙冷阴极气体放电过程中阴极爆炸发射产生的电子和电子碰撞电离产生质子的动力学特性进行了研究。分别给出了在 1.33× 10 - 2 Pa氢气压和 10kV间隙电压下 ,气体放电过程中电子和质子的空间和相空间分布、速度统计分布以及轴线上电荷密度分布 ,分析了阴极爆炸发射电子电离过程。模拟结果表明 ,间隙中电子的最大速度达 5 .8× 10 7m/s ,而只有少数的气体电离产生的质子最大速度达到 1.3× 10 6 m/s。

Dynamic characteristics of initial process of gas ionization by explosive electrons emitted from the cathode have been simulated by using particle-in-cell MAGIC code and based on the models of the cathode explosive electron emission and the neutral gas ionization. The profiles of space and phase space, and the histograms of velocity for electrons and protons in the gap, as well as the total charge density along the symmetrical axis direction are presented at a hydrogen pressure of 1.33×10 -2 Pa and an applied voltage of 10kV, respectively. The initial processes of electron emission and gas discharge as well as behavior of particles were analyzed. The results also showed that the maximum velocity of electrons and protons are 5.8×10 7m/s and 1.3×10 6m/s, respectively.