Contribution Contributed Oral
MPGD-based photon detector upgrade for COMPASS RICH
The RICH detector of the COMPASS Experiment at CERN SPS is undergoing an important upgrade: the central MWPC-based photon detectors have been replaced with novel Micropattern detectors, to cope with the challenging efficiency and stability requirements of the new COMPASS measurements.
The new hybrid MPGD detector consists of two layers of ThickGEMs and capacitive bulk Micromegas. Photoconversion takes place on the CsI layer deposited onto the first ThickGEM; while position information and signals are read out from the pad-segmented anode via capacitive coupling by analog FEE based on APV25 chips.
The presentation focuses on the main issues of production, detailed quality assessment technique, and the commissioning status of the first in-experiment MPGD-based RICH. The talk will be given on behalf of a the COMPASS RICH Group.