4 MV激光触发多级多通道开关特性

 报道了4 MV激光触发多级多通道开关的结构设计和初步的实验结果及分析。该开关采用轴向聚焦触发方式，设计为匀场结构，采用场调整环与匀压环调整开关间隙电场分布，电极-绝缘子序列采用堆栈结构替代榫接结构，独立定位、紧固。实验结果表明：4 MV激光触发多级多通道开关的自击穿电压偏差小于5%，自击穿电压与工作气压呈良好的线性关系；触发延迟时间约25 ns，极差小于±2.5 ns，抖动1.5 ns；等工作电压-气压比条件下，随着气压和工作电压的上升触发延迟时间及其抖动趋向下降。

Switching property of 4 MV laser-triggered multistage switch

The design and experimental results of the 22-stage 4 MV laser-triggered multi-channel switch are reported. The field distribution of the laser-triggered gap and the serial selfbreakdown gaps are symmetrical. The selfbreakdown gap is designed as an annular gap formed by disk electrodes and a column insulator stack. The field distribution of the switch section is regulated by the voltage-holding field regulation ring. The experimental results show that the maximal deviation of the selfbreakdown voltage is less than 5%. The difference between the average selfbreakdown voltage and the linear fit is less than 5%. The switch is triggered by a 4 ns, 35 mJ Nd:YAG fourth harmonic laser pulse. The delay is about 25 ns as the working ratio is 85%±3% of the selfbreakdown voltage. The maximal deviat