High-repetition-rate hydrogen spark gap
High-repetition-rate hydrogen spark gap
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DOI：
10.1109/modsym.1990.201064
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发表时间：
1990-06
期刊：
影响因子：
--
通讯作者：
S. Moran;L. W. Hardesty
中科院分区：
文献类型：
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作者：
S. Moran;L. W. Hardesty
为了研制一种紧凑、高功率、高重复频率的开关，对未吹气的加压气体火花隙的恢复特性进行了研究。采用了一种双脉冲技术，其中第一个脉冲使间隙击穿，第二个脉冲用于确定恢复情况。对于在接近自击穿条件下触发的未吹气火花隙，对于大多数气体（如空气、氮气和SF₆），典型的恢复时间约为10毫秒。研究发现，使用具有高热扩散率的氢气，可使恢复时间加快一个数量级，约为1毫秒。通过在远低于自击穿的条件下触发开关，可使开关的恢复速度更快。通过使工作电压显著低于直流击穿电压，可在气体仍处于高温时重新施加电压，从而缩短恢复时间。对氢气的测试表明，当间隙欠压约50%时，（恢复到工作电压的）恢复时间可进一步缩短一个数量级。最近的测试表明，在一种触发管结构中使用高压氢气，未吹气的火花隙可在100毫秒内恢复。
The recovery of unblown pressurized gas spark-gaps has been studied in an effort to develop a compact, high-power, high-repetition-rate switch. A two-pulse technique has been used in which the first pulse breaks down the gap and the second is used to determine recovery. For an unblown spark gap triggered near self-break, typical recovery times are about 10 ms for most gases such as air, nitrogen, and SF/sub 6/. It was found that using hydrogen gas, with its high thermal diffusivity, allows the recovery time to be an order-of-magnitude faster, or about 1 ms. Recovery of the switch can be made even faster by triggering the switch well below self-break. Recovery time can be decreased by making the operating voltage significantly less than the DC breakdown voltage, allowing voltage to be reapplied while the gas is still hot. Tests with hydrogen have shown that recovery times (to the operating voltage) can be further reduced an order-of-magnitude when the gap is undervolted by approximately 50%. Recent tests have demonstrated 100-ms recovery of an unblown spark gap using high-pressure hydrogen in a trigatron configuration.>