等离子体断路开关和电感负载间的功率流特性
Power flow characteristics between a plasma opening switch and an inductive load
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摘要: 利用PIC (particle-in-cell) 方法，结合实验装置的几何结构和实验结果，采用动态开关模型，对微秒等离子体断路开关和电感负载间的功率流特性进行了研究。模拟得到了与实验结果符合较好的开关电压和负载电流波形，并给出了开关下游出现的稀薄等离子体的密度(约1012 cm-3)和速度(约1 cm/ns), 同时也得到了开关下游的空间电流分布。模拟结果表明，开关下游的结构应避免阻抗突变以减少电流损失，同时提高开关阻抗可有利于提高负载上的最大功率。Abstract: Power flow characteristics between a plasma opening switch (POS) and an inductive load were investigated via particle-in-cell simulations based on the experimental parameters. A dynamic switch model was adopted to simulate the POS. The switch voltage and load current from the simulations agree well with the experiments, and electron flow along the anode and the propagation of the low density plasma (about 1012·cm－3) at 1cm/ns from the POS to the load were observed in the simulations. It was shown that larger POS impedance would increase the power transferred to the load. It was inferred that large current loss exists in the discontinuity of the geometrical impedance, which should be avoided in the design．
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Key words:
- inductive storage /
- plasma opening switch /
- power flow /
- particle-in-cell simulation
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