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

doi:10.1088/1674-1056/19/3/032902

中国物理B ›› 2010, Vol. 19 ›› Issue (3): 32902-032902.doi: 10.1088/1674-1056/19/3/032902

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

刘列, 李立民, 徐启福, 程国新, 苌磊

College of Photoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China

收稿日期:2009-02-09 修回日期:2009-08-05 出版日期:2010-03-15 发布日期:2010-03-15
基金资助:
Project supported by the National High Technology Research and Development Program of China.

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

Liu Lie(刘列)^†, Li Li-Min(李立民), Xu Qi-Fu(徐启福), Cheng Guo-Xin(程国新), and Chang Lei(苌磊)

College of Photoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China

Received:2009-02-09 Revised:2009-08-05 Online:2010-03-15 Published:2010-03-15
Supported by:
Project supported by the National High Technology Research and Development Program of China.

摘要/Abstract

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.

Abstract: 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.

Key words: cold cathode, emission uniformity, x rays, time-and-space resolved measurement

中图分类号: (Electric discharges)

52.80.-s

52.50.Dg (Plasma sources) 41.75.Ht (Relativistic electron and positron beams) 52.70.Kz (Optical (ultraviolet, visible, infrared) measurements) 29.25.Bx (Electron sources)

刘列, 李立民, 徐启福, 程国新, 苌磊. Time-and-space resolved measurements of the emission uniformity of carbon fibre cathode in high-current pulsed discharge[J]. 中国物理B, 2010, 19(3): 32902-032902.

Liu Lie(刘列), Li Li-Min(李立民), Xu Qi-Fu(徐启福), Cheng Guo-Xin(程国新), and Chang Lei(苌磊). Time-and-space resolved measurements of the emission uniformity of carbon fibre cathode in high-current pulsed discharge[J]. Chin. Phys. B, 2010, 19(3): 32902-032902.

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

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

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