Beam-based calibrations of the BPM offset at C-ADS Injector Ⅱ

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Wei-Long Chen, Zhi-Jun Wang, Chi Feng, Wei-Ping Dou, Yue Tao, Huan Jia, Wang-Sheng Wang, Shu-Hui Liu and Yuan He. Beam-based calibrations of the BPM offset at C-ADS Injector Ⅱ[J]. Chinese Physics C, 2016, 40(7): 077003. doi: 10.1088/1674-1137/40/7/077003
Wei-Long Chen, Zhi-Jun Wang, Chi Feng, Wei-Ping Dou, Yue Tao, Huan Jia, Wang-Sheng Wang, Shu-Hui Liu and Yuan He. Beam-based calibrations of the BPM offset at C-ADS Injector Ⅱ[J]. Chinese Physics C, 2016, 40(7): 077003.  doi: 10.1088/1674-1137/40/7/077003 shu
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Received: 2015-09-09
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    Supported by National Natural Science Foundation of China (91426303, 11525523)

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Beam-based calibrations of the BPM offset at C-ADS Injector Ⅱ

    Corresponding author: Yuan He,
Fund Project:  Supported by National Natural Science Foundation of China (91426303, 11525523)

Abstract: Beam-based BPM offset calibration was carried out for Injector Ⅱ at the C-ADS demonstration facility at the Institute of Modern Physics (IMP), Chinese Academy of Science (CAS). By using the steering coils integrated in the quadrupoles, the beam orbit can be effectively adjusted and BPM positions recorded at the Medium Energy Beam Transport of the Injector Ⅱ Linac. The studies were done with a 2 mA, 2.1 MeV proton beam in pulsed mode. During the studies, the "null comparison method" was applied for the calibration. This method is less sensitive to errors compared with the traditional transmission matrix method. In addition, the quadrupole magnet's center can also be calibrated with this method.

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