现代应用物理2016，Vol.7Issue(2)：020401-1-020401-5,5.
发射度效应占主导线性电子注的临界半径研究
Critical Radius of Emittance-Dominated Linear Electron Beams
曾鹏 1王光强 2王建国 1李爽 2王东阳 1滕雁2
作者信息
- 1. 西北核技术研究所，西安 710024
- 2. 高功率微波技术重点实验室，西安 710024
- 折叠
摘要
Abstract
The force balance equation for an electron at the radial edge of the magnetic field confined electron beam with emittance effect is derived to define the magnetic induction of the confined electron beam.The critical radius is obtained by comparing the confined magnetic induction for space charge effect with the one for emittance effect.The critical radius of elec-tron beam in the typical electron gun is analyzed,and the result shows that the impact of emittance gets more pronounced and increases markedly as the radius of beam decreases to sub-millimeter,with perveance less than 0.1μA·V-3/2 .In addition,the lower limits of crit-ical radius for linear electron beams with thermionic cathodes are also derived,which show that the qualities of electron beams could be improved by high current density cathode.Mo-reover,beams with current thermionic cathodes could become emittance-dominated when the radius is less than 0.05 mm.Besides,the critical radius is also the lower limit for the ration-al design of electron guns with traditional scaling rules.关键词
线性电子注/发射度效应/空间电荷效应/临界半径Key words
linear electron beam/emittance effect/space charge effect/critical radius分类
信息技术与安全科学引用本文复制引用
曾鹏,王光强,王建国,李爽,王东阳,滕雁..发射度效应占主导线性电子注的临界半径研究[J].现代应用物理,2016,7(2):020401-1-020401-5,5.
