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The beam energy measurement system for the Beijing electron-positron collider

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arxiv 1109.5771 v1 pith:R6GAF2F7 submitted 2011-09-27 physics.acc-ph hep-ex

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
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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
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classification physics.acc-ph hep-ex
keywords beamenergysystembeijingcolliderelectron-positronmeasurementrelative
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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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