Emittance measurement & optimization for the photocathode RF gun with laser profile shaping

被引：0

作者：

刘圣广 ^{[1
]}

Masafumi Fukuda ^{[2
]}

Sakae Araki ^{[2
]}

Nobuhiro Terunuma ^{[2
]}

Junji Urakawa ^{[2
]}

机构：

[1] Institute of High Energy Physics,Chinese Academy of Sciences

[2] High Energy Accelerator Research Organization,1-1,Oho,Tsukuba,Ibaraki,305-0801,Japan

来源：

中国物理C | 2010年 / 34卷 / 05期

关键词：

D O I：

暂无

中图分类号：

TL503.3 [注入装置];

学科分类号：

082701 ;

摘要：

The Laser Undulator Compact X-ray source(LUCX) is a test bench for a compact high brightness X-ray generator,based on inverse Compton Scattering at KEK,which requires high intensity multi-bunch trains with low transverse emittance.A photocathode RF gun with emittance compensation solenoid is used as an electron source.Much endeavor has been made to increase the beam intensity in the multi-bunch trains.The cavity of the RF gun is tuned into an unbalanced field in order to reduce space charge effects,so that the field gradient on the cathode surface is relatively higher when the forward RF power into gun cavity is not high enough.A laser profile shaper is employed to convert the driving laser profile from Gaussian into uniform.In this research we seek to find the optimized operational conditions for the decrease of the transverse emittance.With the uniform driving laser and the unbalanced RF gun,the RMS transverse emittance of a 1 nC bunch has been improved effectively from 5.46 πmm.mrad to 3.66 πmm.mrad.

引用

页码：584 / 588

页数：5

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