Abstract
A dedicated R&D is ongoing for the charged particle identification system of the ALICE 3 experiment proposed for the LHC Run 5 and beyond.One of the subsystems for the high-energy charged particle identification will be a Ring-Imaging Cherenkov (RICH) detector.The possibility of integrating Cherenkov-based charged particle timing measurements is currently under study.The proposed system is based on a proximity-focusing RICH configuration including an aerogel radiator separated from a SiPM array layer by an expansion gap. A thin high-refractive index window of transparent material, acting as a second Cherenkov radiator, is glued on the SiPM array to enable time-of-flight measurements of charged particles by exploiting the yield of Cherenkov photons in the thin window.We assembled a small-scale prototype instrumented with different Hamamatsu SiPM array sensors with pitches ranging from 1 to 3 mm, readout by custom boards equipped with the front-end Petiroc 2A ASICs to measure charges and times.The primary Cherenkov radiator consisted of a 2 cm thick aerogel tile, while various window materials, including SiO2 and MgF2, were used as secondary Cherenkov radiators.The prototype was successfully tested in a campaign at the CERN PS T10 beam line with pions and protons. This paper summarizes the results achieved in the 2023 test beam campaign.
Published Version
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