A low-jitter self-triggered spark-discharge pre-ionization switch: primary research on its breakdown characteristics and working mechanisms

Tianchi WANG (王天驰); Yingchao DU (杜应超); Wei CHEN (陈伟); Junna LI (李俊娜); Haiyang WANG (王海洋); Tao HUANG (黄涛); Linshen XIE (谢霖燊); Le CHENG (程乐); Ling SHI (石凌)

doi:10.1088/2058-6272/ac2420

Plasma Science and Technology > 2021 > 23(11): 115508. > DOI: 10.1088/2058-6272/ac2420

Tianchi WANG (王天驰), Yingchao DU (杜应超), Wei CHEN (陈伟), Junna LI (李俊娜), Haiyang WANG (王海洋), Tao HUANG (黄涛), Linshen XIE (谢霖燊), Le CHENG (程乐), Ling SHI (石凌). A low-jitter self-triggered spark-discharge pre-ionization switch: primary research on its breakdown characteristics and working mechanisms[J]. Plasma Science and Technology, 2021, 23(11): 115508. DOI: 10.1088/2058-6272/ac2420

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A low-jitter self-triggered spark-discharge pre-ionization switch: primary research on its breakdown characteristics and working mechanisms

1 Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084, People's Republic of China
2 Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
3 State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi'an 710024, People's Republic of China
4 State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University, Xi'an 710049, People's Republic of China

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Received Date: June 22, 2021
Revised Date: September 02, 2021
Accepted Date: September 05, 2021

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Abstract

Abstract

MV pulsed switch plays a key role as the transfer switch in large electromagnetic pulse simulators. To broaden the range of self-triggering time, a novel spark-discharge pre-ionization switch, in which the main gap electric field is superposed at the trigger gap to let the electrons in its spark channel also become initial electrons, is proposed and tested. The design idea is: as electrons in the spark channel of the trigger gap always exist after its breakdown, the injection time of pre-ionization should have a more negligible effect on reducing the switch jitter. The experiment results under pulses with a rise time of ∼100 ns support the above assumptions. When the operating voltage is from ∼300 to ∼800 kV and the self-triggering time is ∼45% to ∼75% of the peak time, the breakdown time delay jitter is less than 2 ns, and the breakdown voltage jitter is smaller than 1.25%. Under specific self-triggering time, the breakdown time delay jitter is less than 1.5 ns, and the breakdown voltage jitter is smaller than 0.8%.
- gas switch,
- self-triggering,
- pre-ionization,
- jitter,
- nanosecond pulse

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References

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A low-jitter self-triggered spark-discharge pre-ionization switch: primary research on its breakdown characteristics and working mechanisms