A triple GEM detector with two dimensional readout

TL;DR

This paper presents an improved triple GEM detector with two-dimensional readout, demonstrating enhanced performance for potential use in LHCb inner tracking through beam and cosmic ray tests.

Contribution

It introduces a new design of triple GEM detector featuring thinner transfer gaps, segmented GEM foils, and 2D readout, with performance evaluation.

Findings

Successful operation with intense hadronic beams

Effective cosmic ray detection performance

Enhanced detector stability and resolution

Abstract

The triple GEM detector is a micropattern gas detector which consists of a primary ionisation gap and three consecutive gas electron multiplier (GEM) foils. A printed circuit board with readout strips detects the current induced by the drifting electron cloud originating from the last GEM stage. Thus the gas amplification and the signal readout are completely separated. Triple GEM detectors are being developed as a possible technology for the inner tracking in the LHCb experiment. In an earlier note we have reported first experience with such a detector in a test beam at PSI. Here we describe the construction of an improved version (thinner transfer gaps, segmented GEM foils, two dimensional readout). Results from performance measurements are presented using intense hadronic beams as well as cosmic ray data.