Influence of metal surface morphology on the threshold of vacuum breakdown
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    Abstract:

    It is important for the development and application of pulsed power technology to explore the way to improve vacuum breakdown threshold. On the basis of metal surface electron emission theory, the change law of electrode surface field with diode voltage is analyzed by finite element method. The experimental system is designed and the research is carried out. The experiment compares the TC4 cathodes’ vacuum breakdown thresholds under different surface roughness(Rz). The experimental results demonstrate that the surface roughness of cathodes is 26.13 μm, 10.41 μm, 6.75 μm, 1.12 μm and 0.13 μm; and the breakdown threshold is 306 kV/cm, 345 kV/cm, 358 kV/cm, 392 kV/cm and 428 kV/cm respectively. When the Rz goes from 26.13 μm to 0.13 μm, the breakdown threshold is increased by 39%. The metal surface breakdown threshold increases with the decreasing of Rz. Reducing the Rz of metal surface is an effective way to improve the vacuum breakdown threshold.

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胡祥刚,宋 玮,向 导,朱晓欣,李小泽,谭维兵,张立刚,沈志远,程攀伦,宁 齐,梁 旭.金属表面形貌对真空击穿阈值的影响[J]. Journal of Terahertz Science and Electronic Information Technology ,2019,17(1):174~178

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History
  • Received:November 15,2017
  • Revised:September 25,2018
  • Adopted:
  • Online: March 27,2019
  • Published: