Emission Uniformity of an Annular Graphite Cathode With a Focusing Electrode in a High Power Vacuum Diode

Xiaoling Wu; Changhua Chen; Ping Wu; Yan Teng; Shuang Li; Xiaoxin Zhu

doi:10.1109/ACCESS.2020.2968630

IEEE Access (Jan 2020)

Emission Uniformity of an Annular Graphite Cathode With a Focusing Electrode in a High Power Vacuum Diode

Xiaoling Wu,
Changhua Chen,
Ping Wu,
Yan Teng,
Shuang Li,
Xiaoxin Zhu

Affiliations

Xiaoling Wu: ORCiD; Key Laboratory of Particle and Radiation Imaging, Ministry of Education, Tsinghua University, Beijing, China
Changhua Chen: ORCiD; Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an, China
Ping Wu: ORCiD; Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an, China
Yan Teng: ORCiD; Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an, China
Shuang Li: ORCiD; Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an, China
Xiaoxin Zhu: ORCiD; Science and Technology on High Power Microwave Laboratory, Northwest Institute of Nuclear Technology, Xi’an, China

DOI: https://doi.org/10.1109/ACCESS.2020.2968630
Journal volume & issue: Vol. 8
pp. 19026 – 19032

Abstract

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The emission uniformity of an annular knife-edged cathode in a coaxial diode with a focusing electrode and operating in a low macro electric field has been investigated. It was found that the emission uniformity deteriorated as the cathode width increased from 0.5 mm to 2.0 mm. To improve the emission uniformity, a grooved graphite cathode was prepared by a laser micro-etching treatment. Experimental results demonstrated that the emission threshold for the grooved cathode may be reduced and thus the delay in explosive emission can be decreased. Visual inspection of photographs of the cathode plasmas operating under different guiding magnetic fields (GMFs) was used to confirm improvements in emission uniformity. Even under a low GMF of 0.21 T, good emission uniformity was realized.

Published in IEEE Access

ISSN: 2169-3536 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering
Website: https://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=6287639

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