CERN Accelerating science

Article
Report number	arXiv:1703.05993
Title	High purity 100 GeV electron identification with synchrotron radiation
Related title	High purity 100 GeV electron identification with synchrotron radiation
Author(s)	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. (Santa Maria U., 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. (Santa Maria U., Valparaiso) ; Ulloa, P. (Santa Maria U., Valparaiso) ; Crivelli, P. (Zurich, ETH)
Publication	2017-09-11
Imprint	2017-03-17
Number of pages	6
Note	10 pages, 6 figures
In:	Nucl. Instrum. Methods Phys. Res., A 866 (2017) 196-201
DOI	10.1016/j.nima.2017.05.028
Subject category	hep-ex ; Particle Physics - Experiment ; physics.ins-det ; Detectors and Experimental Techniques
Accelerator/Facility, Experiment	CERN SPS ; NA64 CERN SPS
Test beam	H4
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.
Copyright/License	publication: (License: CC-BY-4.0) The Authors (License: arXiv nonexclusive-distrib. 1.0)

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