Flashover Characteristics and Inhibition Methods for a High-current Ceramic-vacuum Interface

被引：0
|
作者：
Xun T. [1 ]
Sun X. [2 ]
Zhu X. [1 ]
Wang L. [1 ]
Li H. [3 ]
Yang H. [1 ]
Liu J. [1 ]
Zhang J. [1 ]
Zhang J. [1 ]
Zhong H. [1 ]
机构：
[1] College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha
[2] Aerodynamic Research Center, Academy of Military Science PLA China, Mianyang
[3] BaoJi University of Arts and Science, Baoji
来源：
| 1600年 / Chinese Society for Electrical Engineering卷 / 41期
基金：
中国国家自然科学基金;
关键词：
Ceramic-vacuum interface; High-current electron vacuum source; Hold-on voltage test; Particle simulation; Surface treatment; Vacuum flashover;
D O I：
10.13334/j.0258-8013.pcsee.201794
中图分类号：
学科分类号：
摘要：
As a core part, the performance of a high-current electron beam source is essential for high-power sources and accelerators. Ceramic-vacuum interfaces are among the most important components of high current diodes, and the surface flashover seriously restricts their further applications in the field of HPM. In this paper, in order to improve the surface flashover voltage, a flashover dynamic simulation model of ceramic-vacuum interface was established via VSim. The flashover process was obtained by simulating the secondary electron emission coefficient, secondary electron multiplication and collision ionization. The influences of secondary electron emission coefficient, surface desorption gas, and surface charge on surface flashover for ceramic vacuum interface were analyzed. Further, from the perspectives of reducing secondary electron emission coefficient of ceramic and decreasing secondary electron multiplication process, two different methods of surface coating treatment and surface non-uniform corrugation were introduced for flashover inhibition. High voltage tests of ceramic interfaces with different surface treatment were carried out on a long-pulse repetitive platform. Results show that the two methods can improve the ceramic flashover voltage under high-voltage pulse. The surface coating treatment and non-uniform corrugation can increase the flashover voltage by 12.4% and 14.7%, respectively. These works set a good foundation for the application of ceramic-vacuum interfaces in the repetitive and long pulse high-current systems. © 2021 Chin. Soc. for Elec. Eng.
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页码：6796 / 6805
页数：9
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