Upgrade of beam energy measurement system at BEPC-Ⅱ

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英文篇名：Upgrade of beam energy measurement system at BEPC-Ⅱ 作者：张建勇 ; 蔡啸 ; 莫晓虎 ; 郭迪舟 ; 王建力 ; 刘佰奇 ; M.N.Achasov ; A.A.Krasnov ; N.Yu.Muchnoi ; E.E.Pyata ; E.V.Mamoshkina ; F.A.Harris 英文作者：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;F.A.Harris;Institute of High Energy Physics, Chinese Academy of Sciences;Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences;Novosibirsk State University;University of Hawaii; 英文关键词：laser;;HPGe detector;;beam energy measurement 中文刊名：KNWL 英文刊名：中国物理C 机构：Institute of High Energy Physics, Chinese Academy of Sciences;Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences;Novosibirsk State University;University of Hawaii; 出版日期：2016-07-15 出版单位：Chinese Physics C 年：2016 期：v.40 基金：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 Zn Se viewports is supported by the Russian Science Foundation(14-50-00080) 语种：英文; 页：KNWL201607013 页数：10 CN：07 ISSN：11-5641/O4 分类号：94-103

摘要

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.
        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.

引文

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