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
TL;DR
The paper describes a beam energy measurement system for BEPC-II that uses Compton back-scattering to achieve high precision in determining electron and positron beam energies with minimal systematic uncertainty.
Contribution
It introduces a novel measurement system based on Compton back-scattering, achieving a systematic uncertainty of 2×10^{-5} in beam energy determination.
Findings
System achieves 2×10^{-5} systematic uncertainty in energy measurement.
Energy spread uncertainty is approximately 6%.
System effectively measures beam energies for collider operations.
Abstract
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 \cdot 10^{-5}. The relative uncertainty of the beam's energy spread is about 6 %.
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