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Upgrade of beam energy measurement system at BEPC-Ⅱ

Chinese Physics C 2016年第7期40卷 90-99页

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 Institute of High energy Physics Chinese Academy of SciencesBeijing 100049China Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences11 LavrentyevNovosibirsk 630090Russia Novosibirsk State University Novosibirsk 630090Russia University of Hawaii HonoluluHawaii 96822USA

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.

关键词： laser HPGe detector beam energy measurement

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Improvement of beam energy measurement System for BES-III

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World Journal of Nuclear Science and Technology 2016年第4期6卷 261-283页

作者： Jianyong Zhang Xiao Cai Xiaohu Mochizuki Muchnoi Nickolai Achasov Mikhail Elena Abakumova Harris Fred Institute of High energy Physics CAS Beijing China Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences Novosibirsk Russia University of Hawaii Honolulu USA

The beam energy measurement system is significant and profit for both BES-III detector and BEPC-II accelerator. The detection of the high energy scattering photons is realized by virtue of the Compton backscattering principle. Many advanced techniques and precise instruments are employed to acquire the highly accurate measurement of positron/electron beam energy. During five years’ running period, in order to satisfy the requirement of data taking and enhance the capacity of measurement itself, the upgradation of system is continued, which involves the components reformation of laser and optics subsystem, replacement of view-port of the laser to vacuum insertion subsystem, the usage of electric cooling system for high purity germanium detector, and the refinement of data acquisition and processing subsystem. The upgrading of system guarantees the smooth and effective measuring of beam energy at BEPC-II and accommodates the accurate offline energy values for further physics analysis at BES-III.

关键词： Laser HPGe Detector beam energy measurement

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measurement of the ripple of magnet power supply and its effect to the beam energy

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Radiation Detection Technology and Methods 2017年第1期1卷 48-53页

作者： Jian-Yong Zhang Xiao Cai Xiao-Hu Mo Guang-Yi Tang Shu-Jun Wei Feng-Li Long Bin Chen MNAchasov NYuMuchnoi Institute of High energy Physics Chinese Academy of SciencesBeijing 100049China Budker Institute of Nuclear Physics Siberian Branch of the Russian Academy of Sciences11 LavrentyevNovosibirskRussia 630090 Novosibirsk State University NovosibirskRussia 630090

Objective:This study is aimed at measuring the ripple of magnetic power supply of BEPCII and checking its effect to beam *** and methods:A sensor made of printed circuit board coils is designed and *** sensor was inserted into a good area region of the magnetic field with the surface perpendicular to the field force *** change of the magnetic field would be detected according to Faraday’s ***:The experiment result indicates that the timedependent ripple of the magnetic field is in the magnitude of ***:Such a small effect of the time-dependent ripplecan be negligibleto beam energy.

关键词： Laser HPGe detector beam energy measurement

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