/ physics.ins-det arXiv:1703.05993

High purity 100 GeV electron identification with synchrotron radiation

Depero, E. (Zurich, ETH) ; Banerjee, D. (Zurich, ETH) ; Burtsev, V. (Tomsk Polytechnic U.) ; Chumakov, A. (Tomsk Polytechnic U.) ; Cooke, D. (Zurich, ETH) ; Dermenev, A.V. (Moscow, INR) ; Donskov, S.V. (Serpukhov, IHEP) ; Dubinin, F. (Lebedev Inst.) ; Dusaev, R.R. (Tomsk Polytechnic U.) ; Emmenegger, S. (Zurich, ETH) ; Fabich, A. (CERN) ; Frolov, V.N. (Dubna, JINR) ; Gardikiotis, A. (Patras U.) ; Gninenko, S.N. (Moscow, INR) ; Hösgen, M. (Bonn U., HISKP) ; Karneyeu, A.E. (Moscow, INR) ; Ketzer, B. (Bonn U., HISKP) ; Kirsanov, M.M. (Moscow, INR) ; Konorov, I.V. (Munich, Tech. U.) ; Kramarenko, V.A. (SINP, Moscow) ; Kuleshov, S.V. (CCTVal, Valparaiso) ; Lyubovitskij, V.E. (Tomsk Polytechnic U.) ; Lysan, V. (Dubna, JINR) ; Matveev, V.A. (Dubna, JINR) ; Mikhailov, Yu.V. (Serpukhov, IHEP) ; Myalkovskiy, V.V. (Dubna, JINR) ; Peshekhonov, V.D. (Dubna, JINR) ; Peshekhonov, D.V. (Dubna, JINR) ; Polyakov, V.A. (Serpukhov, IHEP) ; Radics, B. (Zurich, ETH) ; Rubbia, A. (Zurich, ETH) ; Samoylenko, V.D. (Serpukhov, IHEP) ; Tikhomirov, V.O. (Lebedev Inst.) ; Tlisov, D.A. (Moscow, INR) ; Toropin, A.N. (Moscow, INR) ; Vasilishin, B. (Tomsk Polytechnic U.) ; Vasquez Arenas, G. (CCTVal, Valparaiso) ; Ulloa, P. (CCTVal, Valparaiso) ; Crivelli, P. (Zurich, ETH)

Pages: 10

Abstract: In high energy experiments such as active beam dump searches for rare decays and missing energy events, the beam purity is a crucial parameter. In this paper we present a technique to reject heavy charged particle contamination in the 100 GeV electron beam of the H4 beam line at CERN SPS. The method is based on the detection with BGO scintillators of the synchrotron radiation emitted by the electrons passing through a bending dipole magnet. A 100 GeV $\pi^-$ beam is used to test the method in the NA64 experiment resulting in a suppression factor of $10^{-5}$ while the efficiency for electron detection is $\sim$95%. The spectra and the rejection factors are in very good agreement with the Monte Carlo simulation. The reported suppression factors are significantly better than previously achieved.

Web-Page: http://inspirehep.net/record/1518143/files/spectra_tot.png; http://inspirehep.net/record/1518143/files/sup_mult.png; http://inspirehep.net/record/1518143/files/setupNA64.png; http://inspirehep.net/record/1518143/files/comp_spectra.png; http://inspirehep.net/record/1518143/files/sketch.png; http://inspirehep.net/record/1518143/files/ecal_v3.png; http://inspirehep.net/record/1518143/files/arXiv:1703.05993.pdf

Note: 10 pages, 6 figures

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 Record created 2017-04-03, last modified 2017-04-03

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