低密度等离子体融断开关的粒子模拟研究

 采用2.5维柱坐标粒子模拟程序研究了低密度等离子体融断开关（PEOS）工作过程中的物理现象，介绍了计算模型的建立和复杂边界的算法处理。模拟结果表明，在PEOS导通电流的过程中，电流通道最初在等离子体的发生器端形成，并且随着导通时间的增大而向负载端漂移。离子的空间分布并没有明显的变化，当PEOS发生断路时，等离子体离子的密度会迅速降低，并最终导致PEOS阴极附近的等离子体的密度已接近为零，此时，阴极电子完全受磁场箍缩作用而不能到达阳极，PEOS完全断开。

Particle simulation of a plasma erosion opening switch

A 2-1/2D cylindrical full electromagnetic particle-in-cell code ABLE2D is used to simulate conducting and opening procession of a low-density plasma erosion opening switch. The building of computing model and complex boundaries has been introduced in detail. In simulation results, current channel forms at the generator side of the plasma at first and migrates to the load side of the plasma with current increase. The electrons in the current channel move across plasma from cathode to anode by E xB drift, the magnetic field is advected with the electron flow as a frozen in field tied to the electrons. The ion density is almost unchanged in the conduction procession of PEOS, but become lower quickly in the opening procession. When PEOS is entirely opening, ion density near cathode is close to