多间隙气体开关紫外光预电离结构
UV pre-ionizing structures for multi-gap gas switch
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摘要: 针对一种用于快前沿直线脉冲变压器驱动源的多间隙气体开关，设计了针式和孔式两种预电离触发结构，获得了两种预电离结构下开关的自击穿特性和触发特性。实验结果表明:增加预电离针后，开关静态特性没有明显变化，开关自击穿电压平均值变化幅度小于3%;开关触发特性明显改善，开关工作电压150 kV、触发电压60 kV时，触发抖动减小约20%，触发阈值降低5~10 kV。对于针式预电离结构，实验研究了不同触发电压、工作气压、电离间隙距离时紫外光强度的变化规律,结果表明在电离间隙距离1.5~3.0 mm时，开关触发抖动小于2.0 ns，预电离效果明显。Abstract: This paper summarizes the structural design and experimental study of UV pre-ionizing for multi-gap gas switch. The structures of needle UV pre-ionizing and hole UV pre-ionizing are designed. Static properties of switches with three trigger structures are obtained. There is no evident change of static field in switches and the change of self-breakdown voltage is under 3% with UV pre-ionizing. The jitter of UV pre-ionizing switches is about 20% less than that of the switch without UV pre-ionizing. The needle UV pre-ionizing method can lower the trigger voltage by 10 kV, and the hole UV one by 5 kV. For needle UV pre-ionizing, the UV intensity with different trigger voltages, gas pressures and distance of UV gap are measured. The optimum distance of UV gap is experimentally determined as 1.5
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Key words:
- multi-gap gas switch /
- uv pre-ionizing /
- self-breakdown voltage /
- trigger jitter
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