激光触发多级多通道开关触发延迟及其抖动特性

Delay and jitter characteristic of the laser triggered multi-stage multi-channel switch

研究了激光触发多级多通道开关的触发延迟时间及其抖动与激光脉冲能量等实验参量的依赖关系,建立了零维数值模拟模型对实验现象进行了理论解释。实验结果表明:触发延迟时间及其抖动随激光脉冲能量、工作电压、气压上升呈下降趋势;随SF6 N2混合气中SF6体积百分含量上升呈上升趋势。欠压比大于等于90%时200kV原理型激光触发多级多通道开关触发延迟时间抖动小于1ns。

The dependences of the delay and jitter of the laser triggered multistage multi-channel switch on the energy of laser pulse, voltage, gas species and pressure were reported in this paper. The experimental phenomena was illustrated by a 0-dimension model in which the delay of the laser triggered gap was calculated by a 2-2 model and the delay of the self-breakdown gaps was calculated by T.H. Martin formulas adjusted by Levinson's data. The laser ionization mechanism in gas indicated by 2-2 model as 2-photon excitation metastable state of gas particles was followed by 2-photon ionization of the excited gas particles. The delay and jitter decreased as the energy of laser pulse, voltage, pressure increased, and increased as the percentage of SF6 in SF6-N2, SF6-Ar mixtures increased. The jitter of 200 kV switch was less than 1 ns.