基于电磁驱动实验装置CQ-7研制需求, 设计了一套6间隙气体开关, 开关高131 mm, 直径108 mm, 总间隙36 mm, 开关电感约40 nH。采用模拟软件Ansoft Maxwell计算分析开关电场强度分布, 电场分布较均匀, 不均匀系数为1.14。开展了开关放电特性研究, 充电±100 kV条件下, 开关放电电流峰值可达70 kA, 放电延时约35 ns, 抖动3 ns。根据开关自击穿电压值, 采用正态分析开关自击穿概率, 开关80%安全系数下, 自放电概率小于10-4。该开关满足CQ-7实验装置研制需求。

In this paper, a six-stage switch for the electro-magnetically driven experimental facility CQ-7 is developed. The switch is 131 mm tall with a radius of 108 mm, the total gap is 36 mm, and the inductance of the switch is about 40 nH. The simulation of the electric field strength between the electrodes shows that the electric field is uniformly distributed with the non-uniform coefficient 1.14. The characteristic experiment studies of the switch show that, when the switch work with the voltage in plus or minus 100 kV, the peak current is 70 kA, the switch breakdown delay time and jitter are 35 ns and 3 ns respectively. Analyzed by Gaussian function, the self-breakdown probability is less than 1×10-4 when the switch work with the safety coefficient 80%. The switch can meet the requirements of the development of the electro-magnetically driven experimental facility CQ-7.