The hybrid MPGD-based photon detectors of COMPASS RICH-1

Agarwala, J.; Alexeev, M.; Azevedo, C. D. R.; Bradamante, F.; Bressan, A.; Buchele, M.; Chatterjee, C.; Chiosso, M.; Cicuttin, A.; Ciliberti, P.; Crespo, M. L.; Dalla Torre, S.; Dasgupta, S.; Denisov, O.; Finger, M.; Finger, Jr. M.; Fischer, H.; Gregori, M.; Hamar, G.; Herrmann, F.; Levorato, S.; Martin, A.; Menon, G.; Panzieri, D.; Sbrizzai, G.; Schopferer, S.; Slunecka, M.; Sulc, M.; Tessarotto, F.; Veloso, J. F. C. A.; Zhao, Y.

doi:10.1016/j.nima.2019.01.058

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 m2. 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 ∼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 / Agarwala, J., Alexeev, M., Azevedo, C.D.R., Bradamante, F., Bressan, A., Buchele, M., Chatterjee, C., Chiosso, M., Cicuttin, A., Ciliberti, P., Crespo, M.L., Dalla Torre, S., Dasgupta, S., Denisov, O., Finger, M., Finger, Jr.M., Fischer, H., Gregori, M., Hamar, G., Herrmann, F., et al.. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - STAMPA. - 952:(2020), pp. 161832.1-161832.4. [10.1016/j.nima.2019.01.058]