Novel gaseous detectors of single photons for RICH applications have been developed and installed on COMPASS RICH-1 in 2016. They have a hybrid architecture consisting of two staggered THGEM layers (one equipped with a CsI photoconverting layer) and a bulk Micromegas; they cover a total area of 1.4 squared meters and operate stably and efficiently. They provide a single photon angular resolution of ~ 1.8 mrad and about 10 detected photons per ring at saturation. The main aspects of their construction and commissioning, their characterization and performance figures are presented.
@article{arxiv.1812.06971,
title = {The Hybrid MPGD-based photon detectors of COMPASS RICH-1},
author = {J. Agarwala and M. Alexeev and C. D. R. Azevedo and F. Bradamante and A. Bressan and M. Buechele and C. Chatterjee and M. Chiosso and A. Cicuttin and P. Ciliberti and M. L. Crespo and S. Dalla Torre and S. Dasgupta and O. Denisov and M. Finger and M. Finger and H. Fischer and M. Gregori and G. Hamar and F. Herrmann and S. Levorato and A. Martin and G. Menon and D. Panzieri and G. Sbrizzai and S. Schopferer and M. Slunecka and M. Sulc and F. Tessarotto and J. F. C. A. Veloso and Y. Zhao},
journal= {arXiv preprint arXiv:1812.06971},
year = {2018}
}