The CERES RICH detector system

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ID: 272339
1994
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Ranked #58 of 88 articles by views in nuclear instruments and methods in physics research section a: accelerators, spectrometers, detectors and associated equipment

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Abstract
We describe the two RICH detectors of the CERES electron pair spectrometer at the CERN SPS which are used for electron identification and, in conjunction with a novel silicon drift detector, for tracking in pp, pA and AA collisions. The RICH detectors are operated at a high γth ⋍ 32 (CH4 at 1 atm.) and are thus rather insensitive to hadrons. The UV-detectors are multistep counters with a multiwire chamber as the last stage. They are operated at gains of 2–4 × 105 using a mixture of He + 6% C2H6 (or CH4) + TMAE. The two UV-detectors are equipped with 53 800 (48 400) square pads. The front end electronics consists of modules with 256 (121) channels, based on a 64-channel charge-sensitive preamplifier VLSI chip. The total readout time is 280 (1600) μs per event. Subsets of the pad data are used as input to a fast trigger processor selecting events with at least two separated electron rings. The trigger achieved an enrichment factor of ∼ 100 in proton-induced interactions, and a factor of ∼3 in 32SAu collisions. The RICH detectors perform very close to their design values. We observe clean Cherenkov rings with an average number of 11.2 (12.5) photons/ring. This is consistent with the calculated value N0 = 131 (75) cm−1 within the systematical error of about 10%. The spatial resolutions of 1.0 and 0.8 mrad (rms) for individual photons are dominated by chromatic aberration and in very good agreement with theoretical expectations.
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Authors R. Baur,A. Breskin,R. Chechik,A. Drees,U. Faschingbauer,P. Fischer,Z. Fraenkel,J. Gläss,P. Glässel,Carlos Pérez De Los Heros,D. Irmscher,R. Männer,A. Pfeiffer,A. Schön,J. Schukraft,Ch. Schwick,A. Shor,H.J. Specht,V. Steiner,S. Tapprogge,G. Tel-Zur,Itzhak Tserruya,Th. Ullrich,J.P. Wurm;R. Baur;A. Breskin;R. Chechik;A. Drees;U. Faschingbauer;P. Fischer;Z. Fraenkel;J. Gläss;P. Glässel;Carlos Pérez De Los Heros;D. Irmscher;R. Männer;A. Pfeiffer;A. Schön;J. Schukraft;Ch. Schwick;A. Shor;H.J. Specht;V. Steiner;S. Tapprogge;G. Tel-Zur;Itzhak Tserruya;Th. Ullrich;J.P. Wurm;
Journal nuclear instruments and methods in physics research section a: accelerators, spectrometers, detectors and associated equipment
Year 1994
DOI
10.1016/0168-9002(94)90537-1
URL
https://sciprofiles.com/publication/view/aaf24a1ca66c6cf59171e5f26621ea63
Keywords
pad ch4 rich detectors ceres rich detector uv detectors theoretical expectations

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