R&D results on a CsI-TTGEM based photodetector

TL;DR

This paper reports on laboratory and beam test results of a CsI-TTGEM based photodetector for high momentum particle identification in the ALICE experiment, demonstrating stable detection of Cherenkov photons with MIPs.

Contribution

It presents the first stable operation of a CsI-TTGEM detector for Cherenkov photon detection in a RICH prototype with combined particle detection capabilities.

Findings

Successful detection of Cherenkov photons with MIPs

Stable operation mode achieved in prototype tests

Preliminary beam test results support further development

Abstract

The very high momentum particle identification detector proposed for the ALICE upgrade is a focusing RICH using a C4F10 gaseous radiator. For the detection of Cherenkov photons, one of the options currently under investigation is to use a CsI coated Triple-Thick-GEM (CsI-TTGEM) with metallic or resistive electrodes. We will present results from the laboratory studies as well as preliminary results of beam tests of a RICH detector prototype consisting of a CaF2 radiator coupled to a 10x10 cm2 CsI-TTGEM equipped with a pad readout and GASSIPLEX-based front-end electronics. With such a prototype the detection of Cherenkov photons simultaneously with minimum ionizing particles has been achieved for the first time in a stable operation mode.