Speaker
Description
The CMS electromagnetic calorimeter (ECAL) is a high resolution crystal calorimeter operating at the CERN LHC. The on-detector readout electronics digitizes the signals and provides information on the deposited energy in the ECAL to the hardware-based Level-1 trigger system. The L1 trigger system receives information from different CMS subdetectors at 40 MHz, the proton bunch collision rate, and decides for each collision whether the full detector must be read out, reducing the rate of accepted events to about 100 kHz. The increased luminosity of the LHC Run2 with respect to Run1 has required frequent calibrations during data taking operations to account at trigger level for radiation-induced changes in crystal and photodetector response. For the LHC Run3 (2022-24), further improvements in the energy and time reconstruction of the CMS ECAL trigger primitives are being explored. These exploit additional features of the on-detector electronics. In this presentation we will review the ECAL trigger primitives performance during LHC Run2 and present the improvements to the ECAL trigger system envisaged for the LHC Run3.
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