Electron-Muon Ranger: performance in the MICE Muon Beam

TL;DR

The Electron-Muon Ranger (EMR) is a highly efficient detector component in MICE that accurately identifies muons and electrons, aiding the study of ionization cooling with precise momentum reconstruction.

Contribution

This paper presents the design, performance, and capabilities of the EMR as a particle-identification and momentum reconstruction tool in the MICE experiment.

Findings

Electron identification efficiency of 98.6%

Beam purity exceeds 99.8%

Muon momentum reconstruction in 100-280 MeV/c range

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/$c$.