XeCl激光触发气体开关的实验研究
EXPERIMENTAL STUDIES OF XeCl LASER-TRIGGERED GAS SWITCHES
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摘要: 通过实验研究了在自流工作状态下,XeCl准分子激光（λ=308nm,FWHM=21ns）对N2和SF6两种气体开关的触发特性。实验结果表明:（1）在p=0.1 MPa,开关工作电压90％VSB(VSB为开关的自击穿电压)时,XeCl激光对N2和SF6两种气体开关的触发阈值约为108W/cm2。（2）开关的触发延时和抖动随着激光能量和开关欠压比的增大而减小,当激光能量为33.8mJ,开关工作电压90％VSB(VSB=36.5kV)时,充N2开关的延时和抖动分别为85.5ns和400ps。相同欠压比下,SF6气体开关(VSB=52kV)的最小抖动度为2ns。（3）SF6气体开关的触发延时与用T.H.Martin公式计算的结果一致。Abstract: The performance of XeCl excimer laser-triggered DC-charged gas (N2, SF6) switches was studied. The experimental results indicated that triggering thresholds of XeCl laser (λ = 308nm, FWHM=21ns) for N2 and SF6 were about 108W/cm2 at 0.1 MPa and 80% VSB and the delay and jitter time decreased with increasing of laser energy and undervoltage ratio. At 90% Fsg (VSB = 36.5kV) and 33.8mJ of laser energy, the delay and jitter time of nitrogen switch was less than 85.5ns and 400ps, respectively. At the same undervoltage ratio, the minimum jitter for SF6 switch (VSB=52kV) was 2ns. The delay of SF6 gas switch was consistent with that given by T. H.Martin's formula.
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Key words:
- laser triggering /
- triggering threshold /
- delay /
- jitter
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