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VACUUM ›› 2023, Vol. 60 ›› Issue (2): 63-67.doi: 10.13385/j.cnki.vacuum.2023.02.11

• Measurement and Control • Previous Articles     Next Articles

Study on Low Vacuum Breakdown Characteristics of Microseconds Pulse in Two-electrode Switch

XIA Ji-lu1,2, ZHANG Zi-cheng1,2, LIU Shi-fei1,2, LI Dian-geng1,2   

  1. 1. College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China;
    2. State Key Laboratory of Pulsed Power Laser Technology, Changsha 410073, China
  • Received:2022-06-09 Online:2023-03-25 Published:2023-03-27

Abstract: The breakdown characteristics of the Paschen curve in the low vacuum range are not revealed in detail, and it is only applicable to the case of uniform electric field. This paper explores the breakdown characteristics of 10-3-10 Pa in microsecond pulse of two-electrode switch. The vacuum breakdown test was carried out with spherical electrode at different electrode spacing to explore and summarize its breakdown rules. Firstly, the field intensity distribution of the discharge cavity with different electrode spacing is simulated. The simulation results show that the field distribution is slightly uneven, and the maximum field intensity is concentrated between the spherical vertices of the electrodes. Then, the state of the electrode surface after the experiment is observed by optical microscope, and the variation of the breakdown field strength and dispersion with the vacuum degree and electrode gap is analyzed. The results show that the ablation of cathode is more obvious than that of anode, and the vacuum breakdown is mainly caused by cathode in small gap. The breakdown field strength increases rapidly with the decrease of pressure, the rising slope increases first and then decreases, and the breakdown field strength tends to be stable, which accords with the rule of vacuum breakdown. The dispersion of vacuum breakdown also increases with vacuum degree, which verifies the randomness and dispersion of vacuum breakdown.

Key words: microsecond pulse, vacuum breakdown, low vacuum

CLC Number: 

  • TL503
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