Abstract
ALICE is the LHC experiment dedicated to the study of heavy-ion collisions. At forward rapidity a muon spectrometer detects muons from low mass mesons, quarkonia, open heavy-flavor hadrons as well as weak bosons. A muon selection based on transverse momentum is made by a trigger system composed of 72 resistive plate chambers (RPCs). For the LHC Run 1 and the ongoing Run 2 the RPCs have been equipped with a non-amplified FEE called ADULT. However, in view of an increase in luminosity expected for Run 3 (2021–2023) the possibility to use an amplified FEE has been explored in order to improve the counting rate limitation and to prevent the aging of the detector, by reducing the charge per hit. A prototype of this new electronics (FEERIC) has been developed and tested first with cosmic rays before equipping one RPC in the ALICE cavern with it. In this paper the most important performance indicators— efficiency, dark current, dark rate, cluster size and total charge —of an RPC equipped with this new FEE will be reviewed and compared to the others read out with ADULT, in pp collisions at √s=5 and 13 TeV and in Pb-Pb collisions at √sNN=5 TeV.
Highlights
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The main goal of this front-end electronics upgrade is to reduce the total charge produced in the gas gap, in order to prevent aging effects and to improve the rate capability
Summary
The working point of the RPC equipped with FEERIC cards has been determined by means of a HV scan performed in June 2015 during low luminosity pp runs at 13 TeV, for three thresholds. As already noticed during the tests with cosmic rays, in maxi-avalanche mode (with ADULT cards with a threshold of 7 mV) the cluster size is lower, ∼ 1.4 for strips of 2 cm width [10]. By considering these results and the fact that no noise is observed in ALICE cavern for a threshold voltage above 33 mV (∼60 fC) for all FEERIC card formats and polarities, the working point has been set at 9375 V for a 70 mV (130 fC) threshold. The HV difference is of 750 V, in line with what was observed during preliminary tests with cosmic rays
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