# Triple GEM performance in magnetic field

## TL;DR

This study evaluates the spatial resolution of triple GEM detectors in strong magnetic fields using muon beams, demonstrating that a combined reconstruction method maintains resolution below 150 μm up to 1 T.

## Contribution

It introduces a combined charge centroid and micro-Time-Projection-Chamber reconstruction method for GEM detectors in magnetic fields.

## Key findings

- Spatial resolution better than 150 μm up to 1 T magnetic field.
- Combined reconstruction method improves performance in magnetic environments.
- Empirical evaluation using CERN muon beam tests.

## Abstract

Performance of triple GEM prototypes in strong magnetic field has been evaluated bymeans of a muon beam at the H4 line of the SPS test area at CERN. Data have been reconstructedand analyzed offline with two reconstruction methods: the charge centroid and the micro-Time-Projection-Chamber exploiting the charge and the time measurement respectively. A combinationof the two reconstruction methods is capable to guarantee a spatial resolution better than 150{\mu}min magnetic field up to a 1 T.