中国物理B ›› 2005, Vol. 14 ›› Issue (9): 1779-1783.doi: 10.1088/1009-1963/14/9/016

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

夏连胜, 张篁, 陈德彪, 张开志, 石金水, 章林文   

  1. Institute of Fluid Physics, CAEP, Mianyang 621900,China
  • 收稿日期:2004-12-10 修回日期:2005-04-26 出版日期:2005-09-20 发布日期:2005-09-20
  • 基金资助:
    Project supported by the Advanced Research for National Defence of China.

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)   

  1. Institute of Fluid Physics, CAEP, Mianyang 621900,China
  • Received:2004-12-10 Revised:2005-04-26 Online:2005-09-20 Published:2005-09-20
  • Supported by:
    Project supported by the Advanced Research for National Defence of China.

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摘要： 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}.

关键词: velvet, multi-pulsed diode, cathode plasma, brightness

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)$^{2}$.

Key words: velvet, multi-pulsed diode, cathode plasma, brightness

中图分类号:  (Magnetohydrodynamic generators and thermionic convertors; plasma diodes)

  • 52.75.Fk
29.25.Bx (Electron sources)