高密度等离子体融断开关融蚀现象的粒子模拟研究
Particle simulation study of erosion phenomena in high-density plasma opening switch
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摘要: 利用自行研制的2.5维全电磁柱坐标粒子模拟程序对高密度等离子体融断开关融断区域中的融蚀现象进行了模拟研究，详细地介绍了计算模型的建立以及复杂边界的算法处理。模拟结果表明在融断开关导通电流的最后阶段，由于磁压力、磁场渗透作用和非中性静电融蚀作用，在融断区域的阴极附近会形成一定宽度的真空鞘层。由于等离子体密度的下降以及初始真空鞘层的存在，使得即使只有较小的离子电流，融蚀机制也完全可以导致PEOS最终断开。Abstract: A 2-1/2D cylindrical full electromagnetic particle-in-cell code is used to simulate erosion phenomena of a high-density plasma opening switch. The computational model involving complex boundaries has been briefly introduced. The simulation results show that at the end of the conduction phase a vacuum sheath will form near a cathode, the formation mechanisms include deformation of plasma by magnetic pressure, the penetration of magnetic field and electrostatic erosion. Because of the descent of the plasma density and the existence of vacuum sheath, plasma opening switch can be opened by erosion mechanism on the condition of smaller ion current density.
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