Upgrade of beam energy measurement system at BEPC-Ⅱ

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Jian-Yong Zhang, Xiao Cai, Xiao-Hu Mo, Di-Zhou Guo, Jian-Li Wang, Bai-Qi Liu, M. N. Achasov, A. A. Krasnov, N. Yu. Muchnoi, E. E. Pyata, E. V. Mamoshkina and F. A. Harris. Upgrade of beam energy measurement system at BEPC-Ⅱ[J]. Chinese Physics C, 2016, 40(7): 076001. doi: 10.1088/1674-1137/40/7/076001
Jian-Yong Zhang, Xiao Cai, Xiao-Hu Mo, Di-Zhou Guo, Jian-Li Wang, Bai-Qi Liu, M. N. Achasov, A. A. Krasnov, N. Yu. Muchnoi, E. E. Pyata, E. V. Mamoshkina and F. A. Harris. Upgrade of beam energy measurement system at BEPC-Ⅱ[J]. Chinese Physics C, 2016, 40(7): 076001.  doi: 10.1088/1674-1137/40/7/076001 shu
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Received: 2015-10-27
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    Supported in part by National Natural Science Foundation of China (NSFC)(11375206, 10775142, 10825524, 11125525, 11235011), the Ministry of Science and Technology of China (2015CB856700, 2015CB856705), State key laboratory of particle and detection and electronics

    and the CAS Center for Excellence in Particle Physics (CCEPP)

    the RFBR grant(14-02-00129-a), U.S. Department of Energy (DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118), U.S. National Science Foundation, part of this work related to the design of ZnSe viewports is supported by the Russian Science Foundation (14-50-00080)

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Upgrade of beam energy measurement system at BEPC-Ⅱ

    Corresponding author: Jian-Yong Zhang,
    Corresponding author: Xiao-Hu Mo,
Fund Project:  Supported in part by National Natural Science Foundation of China (NSFC)(11375206, 10775142, 10825524, 11125525, 11235011), the Ministry of Science and Technology of China (2015CB856700, 2015CB856705), State key laboratory of particle and detection and electronics and the CAS Center for Excellence in Particle Physics (CCEPP) the RFBR grant(14-02-00129-a), U.S. Department of Energy (DE-FG02-04ER41291, DE-FG02-05ER41374, DE-FG02-94ER40823, DESC0010118), U.S. National Science Foundation, part of this work related to the design of ZnSe viewports is supported by the Russian Science Foundation (14-50-00080)

Abstract: The beam energy measurement system is of great importance for both BEPC-Ⅱ accelerator and BES-Ⅲ detector. The system is based on measuring the energies of Compton back-scattered photons. In order to meet the requirements of data taking and improve the measurement accuracy, the system has continued to be upgraded, which involves the updating of laser and optics subsystems, replacement of a view-port of the laser to the vacuum insertion subsystem, the use of an electric cooling system for a high purity germanium detector, and improvement of the data acquisition and processing subsystem. The upgrade system guarantees the smooth and efficient measurement of beam energy at BEPC-Ⅱ and enables accurate offline energy values for further physics analysis at BES-Ⅲ.

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