Abstract
The CMS Electromagnetic Calorimeter (ECAL) is a homogeneous PbWO4-based detector. The upcoming High-Luminosity upgrade of the CERN LHC will provide detectors with unprecedented instantaneous luminosity, entailing an increase of the average number of proton-proton collisions per bunch crossing up to a value of 200. To cope with such busy environment and with the trigger latency and rate, the ECAL readout and trigger electronics system will be replaced. The front-end electronics will deploy custom ASICs optimised for precise timing, improved signal discrimination, lossless data compression, and fast transmission. Off-detector FPGA processor boards will form trigger primitives and perform basic signal reconstruction. The upgraded system has been validated over several test beam campaigns. In terms of physics performance, it will match the outstanding energy resolution of the current ECAL detector, while significantly enhancing the time resolution of electrons and photons above 50 GeV.
Published Version
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