The Beam Energy Measurement System for the Beijing Electron-Positron Collider

E. V. Abakumova,M. N. Achasov,V. E. Blinov,X. Cai,H. Y. Dong,C. D. Fu,F. A. Harris,V. V. Kaminsky,A. A. Krasnov, Q. Liu,X. H. Mo,N. Yu. Muchnoi,I. B. Nikolaev, Q. Qin,H. M. Qu,S. L. Olsen,E. E. Pyata,A. G. Shamov,C. P. Shen,K. Yu. Todyshev, G. S. Varner, Y. F. Wang, Q. Xiao, J. Q. Xu, J. Y. Zhang, T. B. Zhang, Y. H. Zhang, A. A. Zhukov

Nuclear physics B, Proceedings supplement/Nuclear physics B, Proceedings supplements（2012）

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摘要

The beam energy measurement system (BEMS) for the upgraded Beijing electron-positron collider BEPC-II is described. The system is based on measuring the energies of Compton back-scattered photons. The relative systematic uncertainty of the electron and positron beam energy determination is estimated as 2 x 10(-5). The relative uncertainty of the beam's energy spread is about 6%. (C) 2011 Elsevier B.V. All rights reserved.

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关键词

Compton backscattering,Beam energy calibration,Collider BEPC-II,τ-charm factory

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