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Upgrade of Beam Energy Measurement System at BEPC-II

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arxiv 1510.08167 v1 pith:PJQQKQBL submitted 2015-10-28 physics.ins-det hep-ex

Upgrade of Beam Energy Measurement System at BEPC-II

Jian-Yong Zhang , Xiao Cai , Xiao-Hu Mo , Di-Zhou Guo , Jian-Li Wang , Bai-Qi Liu , M. N. Achasov , A. A. Krasnov
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N.Yu. Muchnoi E. E. Pyata E. V. Mamoshkina F. A. Harris
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classification physics.ins-det hep-ex
keywords systemenergybeammeasurementbepc-iisubsystemaccuratebes-iii
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The beam energy measurement system is of great importance and profit for both BEPC-II accelerator and BES-III detector. The system is based on measuring the energies of Compton back-scattered photons. Many advanced techniques and precise instruments are employed to realize the highly accurate measurement of positron/electron beam energy. During five year's running period, in order to meet the requirement of data taking and improve the capacity of measurement itself, the upgradation of system is continued, which involve the component reformation of laser and optics subsystem, replacement of view-port of the laser to vacuum insertion subsystem, the purchase of electric cooling system for high purity germanium detector, and the improvement of data acquisition and processing subsystem. The upgrading of system guarantees the smooth and efficient measuring of beam energy at BEPC-II and accommodates the accurate offline energy values for further physics analysis at BES-III.

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