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Pion contamination in the MICE muon beam

  • Author(s): Adams, D;
  • Alekou, A;
  • Apollonio, M;
  • Asfandiyarov, R;
  • Barber, G;
  • Barclay, P;
  • De Bari, A;
  • Bayes, R;
  • Bayliss, V;
  • Bertoni, R;
  • Blackmore, VJ;
  • Blondel, A;
  • Blot, S;
  • Bogomilov, M;
  • Bonesini, M;
  • Booth, CN;
  • Bowring, D;
  • Boyd, S;
  • Brashaw, TW;
  • Bravar, U;
  • Bross, AD;
  • Capponi, M;
  • Carlisle, T;
  • Cecchet, G;
  • Charnley, C;
  • Chignoli, F;
  • Cline, D;
  • Cobb, JH;
  • Colling, G;
  • Collomb, N;
  • Coney, L;
  • Cooke, P;
  • Courthold, M;
  • Cremaldi, LM;
  • Demello, A;
  • Dick, A;
  • Dobbs, A;
  • Dornan, P;
  • Drews, M;
  • Drielsma, F;
  • Filthaut, F;
  • Fitzpatrick, T;
  • Franchini, P;
  • Francis, V;
  • Fry, L;
  • Gallagher, A;
  • Gamet, R;
  • Gardener, R;
  • Gourlay, S;
  • Grant, A;
  • Greis, JR;
  • Griffiths, S;
  • Hanlet, P;
  • Hansen, OM;
  • Hanson, GG;
  • Hart, TL;
  • Hartnett, T;
  • Hayler, T;
  • Heidt, C;
  • Hills, M;
  • Hodgson, P;
  • Hunt, C;
  • Iaciofano, A;
  • Ishimoto, S;
  • Kafka, G;
  • Kaplan, DM;
  • Karadzhov, Y;
  • Kim, YK;
  • Kuno, Y;
  • Kyberd, P;
  • Lagrange, JB;
  • Langlands, J;
  • Lau, W;
  • Leonova, M;
  • Li, D;
  • Lintern, A;
  • Littlefield, M;
  • Long, K;
  • Luo, T;
  • Macwaters, C;
  • Martlew, B;
  • Martyniak, J;
  • Mazza, R;
  • Middleton, S;
  • Moretti, A;
  • Moss, A;
  • Muir, A;
  • Mullacrane, I;
  • Nebrensky, JJ;
  • Neuffer, D;
  • Nichols, A;
  • Nicholson, R;
  • Nugent, JC;
  • Oates, A;
  • Onel, Y;
  • Orestano, D;
  • Overton, E;
  • Owens, P;
  • Palladino, V;
  • Pasternak, J
  • et al.
Abstract

The international Muon Ionization Cooling Experiment (MICE) will perform a systematic investigation of ionization cooling with muon beams of momentum between 140 and 240 MeV/c at the Rutherford Appleton Laboratory ISIS facility. The measurement of ionization cooling in MICE relies on the selection of a pure sample of muons that traverse the experiment. To make this selection, the MICE Muon Beam is designed to deliver a beam of muons with less than ∼1% contamination. To make the final muon selection, MICE employs a particle-identification (PID) system upstream and downstream of the cooling cell. The PID system includes time-of-flight hodoscopes, threshold-Cherenkov counters and calorimetry. The upper limit for the pion contamination measured in this paper is fπ < 1.4% at 90% C.L., including systematic uncertainties. Therefore, the MICE Muon Beam is able to meet the stringent pion-contamination requirements of the study of ionization cooling.

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