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Pion contamination in the MICE muon beam

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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 f_{\pi} < 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.

Paper:

Published in: 2016 JINST 11 P03001
arXiv: 1511.00556
RAL Preprint: RAL-P-2015-009
DOI: Forthcoming

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Figures:

Fig. 1, Fig. 2, Fig. 3a, Fig. 3b, Fig. 4a, Fig. 4b, Fig. 5, Fig. 6, Fig. 7

Tables:

Table 1, Table 2, Table 3

Electron-Muon Ranger: performance in the MICE Muon Beam

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Abstract

The Muon Ionization Cooling Experiment (MICE) will perform a detailed study of ionization cooling to evaluate the feasibility of the technique. To carry out this program, MICE requires an efficient particle-identification (PID) system to identify muons. The Electron-Muon Ranger (EMR) is a fully-active tracking-calorimeter that forms part of the PID system and tags muons that traverse the cooling channel without decaying. The detector is capable of identifying electrons with an efficiency of 98.6%, providing a purity for the MICE beam that exceeds 99.8%. The EMR also proved to be a powerful tool for the reconstruction of muon momenta in the range 100--280 MeV/c.

Paper:

Published in: 2015 JINST 10 P12012
arXiv: 1510.08306
RAL Preprint: RAL-P-2015-008
DOI: 10.1088/1748-0221/10/12/P12012

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Figures:

Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19

Characterisation of the muon beams for the Muon Ionization Cooling Experiment

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Abstract:

A novel single-particle technique to measure emittance has been developed and used to characterise seventeen different muon beams for the Muon Ionisation Cooling Experiment (MICE). The muon beams, whose mean momenta vary from 171 to 281 MeV/c, have emittances of approximately 1.5--2.3 \pi mm-rad horizontally and 0.6--1.0 \pi mm-rad vertically, a horizontal dispersion of 90--190 mm and momentum spreads of about 25 MeV/c. There is reasonable agreement between the measured parameters of the beams and the results of simulations. The beams are found to meet the requirements of MICE.

Paper:

Published in European Journal of Physics C, Volume 73, Number 10
arXiv: 1306.1509
DOI: 10.1140/epjc/s10052-013-2582-8
INSPIRE HEP

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Figures:

Fig. 1, Fig. 2, Fig. 3, Fig. 4a, Fig. 4b, Fig. 5, Fig. 6, Fig 7a--f, Fig. 8a--c, Fig. 9a, Fig. 9b, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15

Tables:

Table 1, Table 2, Table 3, Table 4

The MICE Muon Beam on ISIS and the beam-line instrumentation of the Muon Ionization Cooling Experiment

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Abstract:

The international Muon Ionization Cooling Experiment (MICE), which is under construction at the Rutherford Appleton Laboratory (RAL), will demonstrate the principle of ionization cooling as a technique for the reduction of the phase-space volume occupied by a muon beam. Ionization cooling channels are required for the Neutrino Factory and the Muon Collider. MICE will evaluate in detail the performance of a single lattice cell of the Feasibility Study 2 cooling channel. The MICE Muon Beam has been constructed at the ISIS synchrotron at RAL, and in MICE Step I, it has been characterized using the MICE beam-instrumentation system. In this paper, the MICE Muon Beam and beam-line instrumentation are described. The muon rate is presented as a function of the beam loss generated by the MICE target dipping into the ISIS proton beam. For a 1 V signal from the ISIS beam-loss monitors downstream of our target we obtain a 30 KHz instantaneous muon rate, with a neglible pion contamination in the beam.

Paper:

Published in Journal of Instrumentation, Volume 7, Number 5
arXiv: 1203.4089
DOI: 10.1088/1748-0221/7/05/P05009
INSPIRE HEP

BibTeX

Figures:

Tables:

pion_contamination.bib (444 Bytes) Rogers, Chris, 22 January 2016 16:27

runTable.tex (993 Bytes) Soler, Paul, 23 January 2016 12:05

beam_settingsTable.tex (499 Bytes) Soler, Paul, 23 January 2016 12:05

systematicsTable.tex (1.2 kB) Soler, Paul, 23 January 2016 12:10