Investigation of laser-triggered water switch under 130 kV microsecond rise-time pulse
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摘要: 开展了百kV s前沿脉冲作用下激光触发水开关的研究。水开关采用球板电极结构，球头轴向开激光通孔，高压极为平板电极。开关自击穿电压133 kV，抖动263 ns。实验研究了激光击穿弧长占据间隙不同比例、不同触发能量和不同触发时刻等因素对触发抖动的影响。结果表明激光触发可将抖动有效减小到30 ns以内。触发能量高于19 mJ时触发抖动与能量大小关系不大。Abstract: Experiments about the laser-triggered water switch under microsecond rise-time pulse were done. Relation between the jitter of trigger breakdown delay time and the length of laser-induced water breakdown arc, laser energy and trigger time was researched. A water gap was designed for these experiments. The gap has two electrodes, one is a hemispheroid and the other is a plate. A hole in the hemispheroid electrode is designed for the laser. From self-breakdown experiments results, self-breakdown voltage of the water switch is about 133 kV, and jitter of self-breakdown delay time is about 263 ns. The jitter of breakdown delay time was reduced to less than 30 ns by laser-triggering. The laser energy has little influence on the jitter of breakdown delay time when the energy is higher than 19 mJ in the experiments.
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Key words:
- laser-triggered /
- water switch /
- jitter /
- breakdown delay time
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