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

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

doi:10.1088/1674-1137/39/12/127003

Chinese Physics C> 2015, Vol. 39> Issue(12) : 127003 DOI: 10.1088/1674-1137/39/12/127003

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

TANG Mei-Tang ^1,2 ,
YANG Xiao-Dong ^1,, ,
MAO Li-Jun ¹ ,
LI Jie ¹ ,
MA Xiao-Ming ¹ ,
YAN Tai-Lai ¹ ,
ZHENG Wen-Heng ^1,2 ,
ZHAO He ^1,2 ,
WU Bo ^1,2 ,
WANG Geng ^1,2 ,
RUAN Shuang ^1,2 ,
SHA Xiao-Ping ¹

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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 m ²³⁸U³²⁺ ions 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.
- electron cooler ,
- tune shift ,
- tune spread ,
- resonance

References

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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 and SHA Xiao-Ping. Side-effects of the space charge field introduced by a hollow electron beam in the electron cooler of CSRm[J]. Chinese Physics C, 2015, 39(12): 127003. doi: 10.1088/1674-1137/39/12/127003

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Received: 2015-04-24

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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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

Corresponding author: YANG Xiao-Dong,

Received Date: 2015-04-24

Available Online: 2015-12-20

Fund Project: Supported by National Natural Science Foundation of China (11375245)

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 m ²³⁸U³²⁺ ions 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.

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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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