Speaker
Description
The ALICE Collaboration is proposing a completely new apparatus, ALICE 3, for the LHC Run 5 and beyond. A key subsystem for high-energy charged particle identification will be a Ring-Imaging Cherenkov (RICH) detector consisting of an aerogel radiator and a photodetector surface based on Silicon Photomultiplier (SiPM) arrays in a proximity-focusing configuration. A thin high-refractive index slab of transparent material (window), acting as a second Cherenkov radiator, is glued on the SiPM arrays to achieve precise charged particle timing. Requiring time matching between aerogel Cherenkov photon and track hits also leads to an improvement of pattern recognition by discarding the uncorrelated SiPM dark count hits.
We assembled a small-scale prototype instrumented with different Hamamatsu SiPM array sensors with pitches ranging from 1 to 3 mm. The Cherenkov radiator consisted of a 2 cm thick aerogel tile with a refractive index of 1.03. SiPM arrays coupled with two different window materials (SiO2 and MgF2) were used. The prototype was successfully tested in beam test campaigns at the CERN PS T10 beam line.
The data were collected with a complete chain of front-end and readout electronics based on the Petiroc 2A and Radioroc 2 together with a picoTDC to measure charges and times. We measured a charged particle detection efficiency above 99% and a single photon angular resolution better than 4 mrad with time resolution better than 70 ps on the tracks of charged particles.
In this talk we present the current status of the R&D performed for the ALICE 3 RICH detector and the expected full scale system performance. A special focus will be given to the beam test results obtained with the RICH prototype.
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