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h1.First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment

Abstract¶

The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, the technique by which it is proposed to cool the muon beam at a future neutrino factory or muon collider. The emittance is measured from an ensemble of muons assembled from those that pass through the experiment. A pure muon ensemble is selected using a particle-identification system that can reject efficiently both pions and electrons. The position and momentum of each muon are measured using a high-precision scintillating-fibre tracker in a 4T solenoidal magnetic field. This paper presents the techniques used to reconstruct the phase-space distributions and reports the first particle-by-particle measurement of the emittance of the MICE Muon Beam as a function of muon-beam momentum.

Paper¶

MICE note: Note 498

Published in "tbc"
arXiv: https://arxiv.org/abs/1810.13224
DOI: "tbc"

"BibTeX":
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"Source":

Figures¶

Figure 1. SchematicdiagramoftheMICEexperiment.Theredrectanglesrepresentthecoilsofthespectrom- eter solenoids and focus-coil module. The individual coils of the spectrometer solenoids are labelled E1, C, E2, M1 and M2. The various detectors (time-of-flight hodoscopes (TOF0, TOF1), Cherenkov counters, scintillating-fibre trackers, KLOE-Light (KL) calorimeter , and Electron Muon Ranger (EMR)) are also represented. The Partial Return Yoke (PRY) is not shown. (PDF, jpg)

Figure 2. (a)Topand(b)sideviewsoftheMICEMuonBeamline,itsinstrumentation,andtheexperimental configuration. A titanium target dipped into the ISIS proton synchrotron and the resultant spill of particles was captured with a quadrupole triplet (Q1–3) and transported through momentum-selecting dipoles (D1, D2). The quadrupole triplets (Q4–6, Q7–9) transported particles to the upstream spectrometer module. The time-of-flight of particles, measured between TOF0 and TOF1, was used for particle identification. (PDF, jpg)

Figure 3. Distribution of the quantities that were used to select the sample used to reconstruct the emittance of the beam: a) the number of space-points in TOF0 plotted against the number of space-points in TOF1 for reconstructed data, and b) reconstructed simulation; c) distribution of the relative time-of-flight, trel; d) distribution of χ2/ndof ; and e) distribution of Rdiff . The 1D distributions show reconstructed data as solid (black) circles and reconstructed MAUS simulation as the solid (yellow) histogram. The solid (black) lines indicate the position of the cuts made on these quantities. Events enter these plots if all cuts other than the cut under examination are passed.(PDF, jpg)

Figure 4. Time of flight between TOF0 and TOF1 (t_01) plotted as a function of muon momentum, p, measured in the upstream tracker. All cuts other than the muon hypothesis have been applied. Particles within the black lines are selected. The white dotted line is the trajectory of a muon that loses the most probable momentum (20 MeV/c) between TOF1 and the tracker in a) reconstructed data, and b) reconstructed Monte Carlo. (PDF, jpg)

Figure 5. Data time of flight. (PDF, jpg)

Figure 6. Data radial position of beam centre against Pz. (PDF, jpg)

Figure 7. Data distribution of x against Px. (PDF, jpg)

Figure 8. Data distribution of x against Py. (PDF, jpg)

Figure 9. Data distribution of x against Pz. (PDF, jpg)

Figure 10. Data distribution of x against y. (PDF, jpg)

Figure 11. Data distribution of y against Px. (PDF, jpg)

Figure 12. Data distribution of y against Py. (PDF, jpg)

Figure 13. Data distribution of y against Pz. (PDF, jpg)

Figure 14. Monte Carlo distribution of Px against Py. (PDF, jpg)

Figure 15. Monte Carlo distribution of Px against Pz. (PDF, jpg)

Figure 16. Monte Carlo distribution of Py against Pz. (PDF, jpg)

Figure 17. Monte Carlo time of flight. (PDF, jpg)

Figure 18. Monte Carlo distribution of x against Px. (PDF, jpg)

Figure 19. Monte Carlo distribution of x against Py. (PDF, jpg)

Figure 20. Monte Carlo distribution of x against Pz. (PDF, jpg)

Figure 21. Monte Carlo distribution of x against y. (PDF, jpg)

Figure 22. Monte Carlo distribution of y against px. (PDF, jpg)

Figure 23. Monte Carlo distribution of y against py. (PDF, jpg)

Figure 24. Monte Carlo distribution of y against pz. (PDF, jpg)

Figure 25. Time of Flight against P at tracker. (PDF, jpg)

bq.Figures under review for ICHEP2016
TOF vs Tracker figure under review for ICHEP2016 (dotted line is fit for a muon to the mean momentum loss -- fit returns 20MeV loss between TOF1 and Tracker)