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

被引：6
|
作者：
Wu, Xiaoling [1 ]
Chen, Changhua [2 ]
Wu, Ping [2 ]
Teng, Yan [2 ]
Li, Shuang [2 ]
Zhu, Xiaoxin [2 ]
机构：
[1] Tsinghua Univ, Key Lab Particle & Radiat Imaging, Minist Educ, Beijing 100084, Peoples R China
[2] Northwest Inst Nucl Technol, Sci & Technol High Power Microwave Lab, Xian 710024, Peoples R China
来源：
IEEE ACCESS | 2020年 / 8卷
关键词：
Emission uniformity; graphite cathode; grooved cathode; low guiding magnetic field; high power microwave generation; BACKWARD-WAVE OSCILLATOR; OPERATION;
D O I：
10.1109/ACCESS.2020.2968630
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
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.
引用
收藏
页码：19026 / 19032
页数：7
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