利用脉冲火花预电离方式，设计了一种脉冲火花预电离触发的触发管气体开关。开关工作电压等级为100 kV,工作介质采用干燥空气，开关主间隙10 mm，电极材料采用304不锈钢，触发结构设计成盘环嵌套结构。实验结果表明：预电离能够显著减小低工作系数下触发管气体开关的触发时延和抖动。对于ns级快脉冲触发，预电离时刻越早，开关击穿时延和抖动越低。在30 kV/8 ns触发脉冲作用下，脉冲预电离触发的触发管开关在80%工作系数时，平均时延约为40 ns，抖动小于1 ns。

Using spark preionization, a trigatron gas switch is designed in the paper. The trigger electrode is disk-ring nested structure with 10 mm spacing, The electrode of switch is made from 304 stainless for operating voltage level up to 100 kV. Experimental results show that the preionization could reduce the trigger delay and jitter of the trigatron under low working voltage obviously. The earlier the preionization is imposed, the lower the delay and jitter of trigatron is under nanosecond trigger pulses. The average delay of 40 ns and jitter of 1 ns or better is achieved when the trigatron switch works at the coefficient of 80% with the trigger pulse of 30 kV and 8 ns risetime.