多脉冲电子束发射度测量

夏连胜; 张篁; 陈德彪; 张开志; 章林文; 邓建军

doi:doi:10.3788/hplpb20102204.0812

强激光与粒子束, 2010, 22 (4): 812, 网络出版: 2010-06-22

多脉冲电子束发射度测量

Measurement of multi-pulsed electron beams emittance

论文大纲

夏连胜 ^*张篁陈德彪张开志章林文邓建军

作者单位

中国工程物理研究院流体物理研究所,四川绵阳 621900

电子束多脉冲发射度亮度 multi-pulsed electron beams emittance brightness cathode plasma

摘要

采用多孔板并结合电子束在石英片相互作用产生的契仑柯夫辐射,对以天鹅绒为阴极发射的强流多脉冲电子束发射度和亮度进行了实验研究和测量。实验观测到了有外加磁场条件下的电子束发生旋转现象。对于电子能量为600 kV左右的电子束,多孔板处的磁场小于2.7 mT时,电子束元的偏离已经小于2°。分别测量了天鹅绒阴极发射的强流四脉冲电子束和双脉冲电子束的积分亮度,分别为7.5×107 A/(m·rad)2和4.14×108 A/(m·rad)2。结果表明,双脉冲电子束的积分亮度明显优于四脉冲电子束的积分亮度,进而验证了阴极等离子体对多脉冲电子束亮度具有重要影响,降低了电子束的品质。

Abstract

The emittance of multi-pulsed electron beams was experimentally measured using pepper pot and thus the corresponding brightness was calculated. Different from using fluorescent screen as the recorder of beam divergence angle,a quartz foil was used to record the information through Cerenkov radiation,which is generated by the interaction of electron beamlets and the quartz foil. The phenomenon of beam rotation in magnetic field was observed in the experiment,and the integrated brightness of double-pulsed and four-pulsed beams were measured. For the electron beam of about 600 kV,the divergence of beamlets was below 2° when the magnetic field at the pepper plate was lower than 2.7 mT. The calculated brightnesses of the double-pulsed and four-pulsed beams were 4.14×108 A/(m·rad)2 and 7.5×107 A/(m·rad)2 respectively. The difference may be due to the movement of cathode plasma.

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夏连胜, 张篁, 陈德彪, 张开志, 章林文, 邓建军. 多脉冲电子束发射度测量[J]. 强激光与粒子束, 2010, 22(4): 812. Xia Liansheng, Zhang Huang, Chen Debiao, Zhang Kaizhi, Zhang Linwen, Deng Jianjun. Measurement of multi-pulsed electron beams emittance[J]. High Power Laser and Particle Beams, 2010, 22(4): 812.

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