Author(s)

Jianyong Zhang¹, Xiao Cai¹, Xiaohu Mochizuki¹, Muchnoi Nickolai², Achasov Mikhail², Elena Abakumova², Harris Fred³

¹Institute of High Energy Physics, CAS, Beijing, China.
²Budker Institute of Nuclear Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia.
³University 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.

Laser, HPGe Detector, Beam Energy Measurement

Zhang, J. , Cai, X. , Mochizuki, X. , Nickolai, M. , Mikhail, A. , Abakumova, E. and Fred, H. (2016) Improvement of Beam Energy Measurement System for BES-III. World Journal of Nuclear Science and Technology, 6, 261-283. doi: 10.4236/wjnst.2016.64025.