High purity 100 GeV electron identification with synchrotron radiation

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...

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Detalles Bibliográficos
Autores principales: Depero, E., Banerjee, D., Burtsev, V., Chumakov, A., Cooke, D., Dermenev, A.V., Donskov, S.V., Dubinin, F., Dusaev, R.R., Emmenegger, S., Fabich, A., Frolov, V.N., Gardikiotis, A., Gninenko, S.N., Hösgen, M., Karneyeu, A.E., Ketzer, B., Kirsanov, M.M., Konorov, I.V., Kramarenko, V.A., Kuleshov, S.V., Lyubovitskij, V.E., Lysan, V., Matveev, V.A., Mikhailov, Yu.V., Myalkovskiy, V.V., Peshekhonov, V.D., Peshekhonov, D.V., Polyakov, V.A., Radics, B., Rubbia, A., Samoylenko, V.D., Tikhomirov, V.O., Tlisov, D.A., Toropin, A.N., Vasilishin, B., Vasquez Arenas, G., Ulloa, P., Crivelli, P.
Lenguaje:eng
Publicado: 2017
Materias:
hep-ex
Particle Physics - Experiment
physics.ins-det
Detectors and Experimental Techniques
Acceso en línea:https://dx.doi.org/10.1016/j.nima.2017.05.028
http://cds.cern.ch/record/2256460
Descripción
Sumario: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 ∼ 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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