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High purity 100 GeV electron identification with synchrotron radiation

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arxiv 1703.05993 v1 pith:277VNI23 submitted 2017-03-17 physics.ins-det hep-ex

High purity 100 GeV electron identification with synchrotron radiation

E. Depero , D. Banerjee , V. Burtsev , A. Chumakov , D. Cooke , A. V. Dermenev , S. V. Donskov , F. Dubinin
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R. R. Dusaev S. Emmenegger A. Fabich V. N. Frolov A. Gardikiotis S. N. Gninenko M. H\"osgen A. E. Karneyeu B. Ketzer M. M. Kirsanov I. V. Konorov V. A. Kramarenko S. V. Kuleshov V. E. Lyubovitskij V. Lysan V. A. Matveev Yu. V. Mikhailov V. V. Myalkovskiy V. D. Peshekhonov D. V. Peshekhonov V. A. Polyakov B. Radics A. Rubbia V. D. Samoylenko V. O. Tikhomirov D. A. Tlisov A. N. Toropin B. Vasilishin G. Vasquez Arenas P. Ulloa P. Crivelli
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classification physics.ins-det hep-ex
keywords beamelectrondetectionenergyfactorshighmethodpurity
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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.

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Cited by 2 Pith papers

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