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Chinese Physics, 2005, Vol. 14(9): 1779-1783    DOI: 10.1088/1009-1963/14/9/016
NUCLEAR PHYSICS Prev   Next  

Velvet's multi-pulsed emission and multi-pulsed electron beams

Xia Lian-Sheng (夏连胜), Zhang Huang (张篁), Chen De-Biao (陈德彪), Zhang Kai-Zhi (张开志), Shi Jin-Shui (石金水), Zhang Lin-Wen (章林文)
Institute of Fluid Physics, CAEP, Mianyang 621900,China
Abstract  The velvet electron emission characteristics and beams' brightness are investigated with a multi-pulsed mode. The results indicate that in the multi-pulsed mode the velvet emission is not uniform and the periphery emission is much stronger than that from the centre. The periphery emission contributes much more to the formation of the cathode plasma than the centre emission, which leads to diode impendence breakdown. The relationship between the cathode plasma expansion and the initial emittance of the cathode is deduced to describe the characteristics of the multi-pulsed vacuum diode. The emittance of the multi-pulsed beams is measured to be less than 1000mm \cdot mrad. The brightness of the electron beams is better than $1\times 10^{8}$A/(m$\cdot$rad)$^{2}$.
Keywords:  velvet      multi-pulsed diode      cathode plasma      brightness  
Received:  10 December 2004      Revised:  26 April 2005      Accepted manuscript online: 
PACS:  52.75.Fk (Magnetohydrodynamic generators and thermionic convertors; plasma diodes)  
  29.25.Bx (Electron sources)  
Fund: Project supported by the Advanced Research for National Defence of China.

Cite this article: 

Xia Lian-Sheng (夏连胜), Zhang Huang (张篁), Chen De-Biao (陈德彪), Zhang Kai-Zhi (张开志), Shi Jin-Shui (石金水), Zhang Lin-Wen (章林文) Velvet's multi-pulsed emission and multi-pulsed electron beams 2005 Chinese Physics 14 1779

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