Abstract

The Muon Ionization Cooling Experiment (MICE) will demonstrate the principle of muon beam phase-space reduction via ionization cooling. Muon beam cooling will be required for the proposed Neutrino Factory or Muon Collider. The phase-space before and after the cooling cell must be measured precisely. This is achieved using two scintillating-fibre trackers, each placed in a solenoidal magnetic field. This paper describes the software reconstruction for the fibre trackers: the GEANT4 based simulation; the implementation of the geometry; digitisation; space-point reconstruction; pattern recognition; and the final track fit based on a Kalman filter. The performance of the software is evaluated by means of Monte Carlo studies and the precision of the final track reconstruction is evaluated.

Highlights

  • : The Muon Ionization Cooling Experiment (MICE) will demonstrate the principle of muon beam phase-space reduction via ionization cooling

  • Muon beam cooling will be required for the proposed Neutrino Factory or Muon Collider

  • This paper describes the software reconstruction for the fibre trackers: the GEANT4 based simulation; the implementation of the geometry; digitisation; space-point reconstruction; pattern recognition; and the final track fit based on a Kalman filter

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Summary

Overview

The Muon Ionization Cooling Experiment (MICE) will perform a practical demonstration of muon ionization cooling. Muon beams are generated via pion decay, and have a large emittance, which must be reduced so that a reasonable fraction of the beam will fall within the acceptance of the downstream acceleration system. Ionization cooling was proposed in the early 1970s [3, 4], but has not yet been demonstrated at the energies of interest for the Neutrino Factory or Muon Collider. Ionization cooling reduces emittance by passing a beam through some suitable material of low atomic-number such as liquid hydrogen. This leads to the reduction of all components of momentum due to ionization energy loss. The first step of the programme, consisting of the muon beam line with particle identification, is complete and results are MICE Muon Beam (MMB). The present step of the program, which introduced the trackers and the first absorber module, began taking data in 2015

The scintillating fibre trackers
Channels and digits
Planes and clusters
Stations and spacepoints
Trackers and tracks
Tracker reconstruction data structure
Digitization
Cluster reconstruction
Spacepoint reconstruction
Helical pattern recognition
Straight line pattern recognition
Track fit
Kuno’s conjecture
Track finding efficiency
Findings
Conclusion
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