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Chin. Phys. B, 2010, Vol. 19(3): 032902    DOI: 10.1088/1674-1056/19/3/032902
NUCLEAR PHYSICS Prev   Next  

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
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.
Keywords:  cold cathode      emission uniformity      x rays      time-and-space resolved measurement  
Received:  09 February 2009      Revised:  05 August 2009      Accepted manuscript online: 
PACS:  52.80.-s (Electric discharges)  
  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)  
Fund: Project supported by the National High Technology Research and Development Program of China.

Cite this article: 

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 2010 Chin. Phys. B 19 032902

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