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arxiv: 1812.06971 · v1 · pith:332RYNJ5new · submitted 2018-12-17 · ⚛️ physics.ins-det · hep-ex· nucl-ex

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

J.Agarwala , M.Alexeev , C.D.R.Azevedo , F.Bradamante , A.Bressan , M.Buechele , C.Chatterjee , M.Chiosso
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A.Cicuttin P.Ciliberti M.L.Crespo S.Dalla Torre S.Dasgupta O.Denisov M.Finger M.Finger Jr. H.Fischer M.Gregori G.Hamar F.Herrmann S.Levorato A.Martin G.Menon D.Panzieri G.Sbrizzai S.Schopferer M.Slunecka M.Sulc F.Tessarotto J.F.C.A.Veloso Y.Zhao
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classification ⚛️ physics.ins-det hep-exnucl-ex
keywords theycompassdetectorshybridphotonphotonsrich-1single
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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.

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