等离子体融断开关磁场Hall渗透机制的模拟研究
Particle simulation study of hall magnetic field penetration in plasma erosion opening switch
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摘要: 利用自行研制的2-1/2维全电磁柱坐标粒子模拟程序对等离子体融断开关磁场渗透机制进行了模拟研究。模拟结果表明在磁场Hall渗透机制特征长度远远小于等离子体离子的无碰撞趋肤深度的条件下，等离子体内部磁场渗透过程主要由电子流体运动的Hall项来控制。对于等离子体空间分布存在较大的密度梯度的物理问题，必须考虑二维空间特性对磁场渗透速度的影响。在磁场已渗透经过的等离子体区域中，等离子体呈现非电中性，离子受静电场的作用会加速运动到达阴极，最终形成真空鞘层。Abstract: A 2-1/2D cylindrical full electromagnetic particle-in-cell code is used to simulate magnetic field penetration in plasma erosion opening switch. The simulation results show that the penetrat ion of magnetic field into plasma is due to Hall field on the condition that the characteristic Hall length is small compared with the ion collisionless skin depth. Strong two dimensional effect on the field penetrating speed should be included in the fluid analysis for a plasma space distribution with high density gradient. The region where the magnetic field has penetrated shows no neutral characteristic, and the electric field can accelerate ions to the cathode and form the vacuum sheath.
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Key words:
- particle simulation /
- plasma opening switch /
- magnetic field penetration
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