Novel gaseous detectors of single photons for RICH applications have been developed and installed on COMPASS RICH-1 in 2016, covering a total area of 1.4 m(2). They have a hybrid architecture consisting of two staggered THGEM layers (one equipped with a CsI photoconverting layer) and a bulk Micromegas and operate stably and efficiently, providing a single photon angular resolution of similar to 1.8 mrad and about 10 detected photons per ring at saturation. The main aspects of their construction, commissioning, characterization and performance are presented.
The hybrid MPGD-based photon detectors of COMPASS RICH-1
M. Alexeev;M. Chiosso;D. Panzieri;
2020-01-01
Abstract
Novel gaseous detectors of single photons for RICH applications have been developed and installed on COMPASS RICH-1 in 2016, covering a total area of 1.4 m(2). They have a hybrid architecture consisting of two staggered THGEM layers (one equipped with a CsI photoconverting layer) and a bulk Micromegas and operate stably and efficiently, providing a single photon angular resolution of similar to 1.8 mrad and about 10 detected photons per ring at saturation. The main aspects of their construction, commissioning, characterization and performance are presented.
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