Discharge characteristics of trigger brick gas switches for 12-stage linear transformer driver
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摘要: 12级串联太瓦级直线型变压器驱动源（LTD）采用内置时序触发新方法，对触发支路气体开关提出了低自放概率、低触发阈值、低抖动、触发延时可调的技术要求。介绍了自行研制的基于电阻均压/电晕辅助触发技术的气体开关结构和工作原理；建立了气体开关特性测试平台，完成了12只气体开关的老练和击穿特性测试；开关应用于12级LTD脉冲源级联触发实验，获得了不同工作电压、工作系数下的触发特性参数。实验结果表明：开关工作电压±60～±80 kV，工作系数60%～80%，抖动小于2 ns，500余发实验未发生自放电，实现了12级LTD脉冲源触发支路按理想时序依次导通，触发时序系数0.83～1.17范围内可调。Abstract: The 12-stage linear transformer driver (LTD) adopts the novel method of internal in situ triggering in sequence, and puts forward the technical requirements of low pre-fire probability, low trigger threshold voltage, low jitter and adjustable trigger delay time for the trigger brick gas switches. This paper introduces the structure and working principle of the trigger brick gas switch based on resistance voltage balance and corona assisted triggering technology. The test platform of gas switch characteristics is established, and after the process of conditioning, the breakdown characteristics of 12 gas switches are tested. Then, the switches are applied to the 12-stage LTD to carry out cascade triggering experiments, and the triggering characteristic parameters under different charging voltages and working coefficients are obtained. The experimental results show that, when the charging voltage of the switch is ±60−±80 kV and the working coefficient is 60%−80%, the jitter is lower than 2 ns, and there is no pre-fire in more than 500 shots. The trigger brick gas switches of the 12-stage LTD can be sequentially closed according to the ideal sequence, and the trigger sequence coefficient can be adjusted in the range of 0.83−1.17.
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图 2 陶瓷筒外壁均压电阻
Figure 2. Resistors for voltage balance on the outer surface of the ceramic tube
图 3 触发时开关电场分布
Figure 3. Electrostatic field plot of the switch when the triggering process is about to start
图 7 12只开关老练过程中自击穿电压及标准差变化情况
Figure 7. Average and standard deviation of self-breakdown voltage during the process of conditioning
图 8 12只开关自击穿电压及标准差
Figure 8. Self-breakdown voltage and standard deviation of 12 switches
图 10 4#和8#开关触发考核延时
Figure 10. Delay time of the switches 4# and 8# during triggering test
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