Plasma Dynamics in Opening Switches
Plasma Dynamics in Opening Switches
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DOI：
10.1109/tps.2008.917518
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发表时间：
2008-04
影响因子：
1.5
通讯作者：
S. Loginov
中科院分区：
文献类型：
--
作者：
S. Loginov
计算了等离子体开启开关在导通阶段的能量平衡，其中磁活塞效应导致磁场穿透等离子体体积是主导过程。这种机制是典型的微秒等离子体开启开关在兆安培范围。磁场穿透开关等离子体的过程是由磁活塞附近的磁场扩散决定的，然后是等离子体中磁场的对流输运。这种传输是由于磁场被冻结在激波前后面的等离子体流中，这是在磁场压力加速的等离子体中形成的。激波的传播导致在磁活塞和激波前之间的区域形成密度、速度和压力下降的定向等离子体流。下面对气体动力学和相关电磁问题的分析揭示了决定等离子体和磁场动力学的最重要过程。
The energy balance of a plasma opening switch in the conduction stage is calculated, in which the dominant process is magnetic field penetration into the plasma volume due to the magnetic piston effect. This mechanism is typical for a microsecond plasma opening switch of the mega-ampere range. It is also shown that the process of magnetic field penetration into the switch plasma is determined by the field diffusion near the magnetic piston, followed by the convective transport of magnetic field in the plasma. This transport is due to the field being frozen-in into the plasma flow behind the shock wavefront, which is formed in the plasma accelerated by the magnetic field pressure. The shock wave propagation leads to the formation of directed plasma flow with falling density, velocity, and pressure in the region between the magnetic piston and the shock wavefront. The following analysis of gas dynamics and related electromagnetic problems reveals the most important processes determining plasma and magnetic field dynamics.