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

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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
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 shu
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Received: 2015-04-24
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    Supported by National Natural Science Foundation of China (11375245)

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

    Corresponding author: YANG Xiao-Dong,
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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