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Abstract
The performance of the CMS electromagnetic calorimeter (ECAL) has been continuously monitored at the LHC. The evolution of this performance is a critical issue for the future. Work has started to assess the need for possible changes to the detector to ensure adequate performance for High-Luminosity LHC (HL-LHC) operation, planned for 2022 and beyond. Results from CMS running, beam tests and laboratory measurements on proton-irradiated crystals are combined to predict the performance of the current detector at the HL-LHC. This is achieved using MC simulations of the CMS detector, where the ECAL response has been tuned to account for the ageing of the detector components. In addition, various R&D studies are presented in case modification or replacement of the ECAL Endcaps is needed for the HL-LHC period.
Highlights
The performance of the CMS electromagnetic calorimeter (ECAL) has been continuously monitored at the LHC
The LHC is at the beginning of its operation, with ∼30 fb−1 of integrated luminosity, evidence of some radiation damage is already visible in the ECAL
The observation is in general agreement with expectations and is taken into account in data analysis, to ensure the high quality of the ECAL detector performance and the corresponding physics results
Summary
LHC =8 delivered TeV with an an integrated luminosity of about instantaneous peak luminosity of. In order to fully exploit the LHC potential, a major upgrade is foreseen in 2022. It is expected to operate for 10 years and to collect Ldt = 3000 fb−1, by the end of 2033. During this Phase II (HL-LHC) operation, there will be a very challenging running environment with a peak luminosity 5 × the initial design conditions and radiation levels typically a factor 6 higher, with strong pseudo-rapidity dependence in the EE. The ECAL will have been operated beyond its design specifications by the end of Phase I. It is crucial that the current performance is maintained during Phase II, to fully exploit the HL-LHC potential
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