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Side-effects of the space charge field introduced by a hollow electron beam in the electron cooler of CSRm

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【作者】 汤梅堂杨晓东冒立军李杰马晓明晏太来郑文亨赵贺吴波王耿阮爽沙小平

【Author】 TANG Mei-Tang;YANG Xiao-Dong;MAO Li-Jun;LI Jie;MA Xiao-Ming;YAN Tai-Lai;ZHENG Wen-Heng;ZHAO He;WU Bo;WANG Geng;RUAN Shuang;SHA Xiao-Ping;Institute of Modern Physics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;

【机构】 Institute of Modern Physics,Chinese Academy of SciencesUniversity of Chinese Academy of Sciences

【摘要】 An electron cooler is used to improve the quality of the ion beam in a synchrotron;however it also introduces a nonlinear electromagnetic field to the accelerator,which causes tune shift,tune spread and may drive resonances leading to ion beam loss.In this paper the tune shift and the tune spread caused by the nonlinear electromagnetic field of a hollow electron beam is investigated,and the resonance driving terms of the nonlinear electromagnetic field are analysed.The differences are presented compared with a solid electron beam.Calculations are performed for 238U32+ ion of energy 1.272 MeV stored in the main Cooler Storage Ring(CSRm) at the Institute of Modern Physics,Lanzhou.It is found that in this situation the nonlinear field caused by the hollow electron beam does not lead to serious resonances.

【Abstract】 An electron cooler is used to improve the quality of the ion beam in a synchrotron;however it also introduces a nonlinear electromagnetic field to the accelerator,which causes tune shift,tune spread and may drive resonances leading to ion beam loss.In this paper the tune shift and the tune spread caused by the nonlinear electromagnetic field of a hollow electron beam is investigated,and the resonance driving terms of the nonlinear electromagnetic field are analysed.The differences are presented compared with a solid electron beam.Calculations are performed for 238U32+ ion of energy 1.272 MeV stored in the main Cooler Storage Ring(CSRm) at the Institute of Modern Physics,Lanzhou.It is found that in this situation the nonlinear field caused by the hollow electron beam does not lead to serious resonances.

【关键词】 electron coolertune shifttune spreadresonance
【Key words】 electron coolertune shifttune spreadresonance
【基金】 Supported by National Natural Science Foundation of China(11375245)
  • 【文献出处】 Chinese Physics C ,中国物理C , 编辑部邮箱 ,2015年12期
  • 【分类号】TL503
  • 【下载频次】22
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