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ISSN - 01689002, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2011, vol. 659, p. 21-29

The beam energy measurement system for the Beijing electronpositron collider

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

The beam energy measurement system (BEMS) for the upgraded Beijing electronpositron 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 2×10-5. The relative uncertainty of the beams energy spread is about 6%. © 2011 Elsevier B.V. All rights reserved.