Time-and-space resolved measurements of the emission uniformity of carbon fibre cathode in high-current pulsed discharge

被引：4
|
作者：
Liu Lie [1 ]
Li Li-Min [1 ]
Xu Qi-Fu [1 ]
Cheng Guo-Xin [1 ]
Chang Lei [1 ]
机构：
[1] Natl Univ Def Technol, Coll Photoelect Sci & Engn, Changsha 410073, Hunan, Peoples R China
来源：
CHINESE PHYSICS B | 2010年 / 19卷 / 03期
基金：
国家高技术研究发展计划(863计划);
关键词：
cold cathode; emission uniformity; x rays; time-and-space resolved measurement; EXPLOSIVE ELECTRON-EMISSION; VELVET; PLASMA; OSCILLATOR; DIODES; BEAMS;
D O I：
10.1088/1674-1056/19/3/032902
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The remaining challenges, confronting high-power microwave (HPM) sources and pulsed power generators, stimulate the developments of robust relativistic electron beam sources. This paper presents a carbon fibre cathode which is tested in a single pulsed power generator. The distribution and the development of cathode plasma are observed by time-and-space resolved diagnostics, and the uniformity of electron beam density is checked by taking x-ray images. A quasistationary behaviour of cathode plasma expansion is observed. It is found that the uniformity of the extracted electron beam is satisfactory in spite of individual plasma jets on the cathode surface. These results show that carbon fibre cathodes can provide a positive prospect for developing a high-quality electron beam.
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页数：7
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