Abstract

The electromagnetic calorimeter (ECAL) of the Compact Muon Solenoid Experiment (CMS) is operating at the Large Hadron Collider (LHC) in 2016 with proton-proton collisions at 13 TeV center-of-mass energy and at a bunch spacing of 25 ns. Challenging running conditions for CMS are expected after the High-Luminosity upgrade of the LHC (HL-LHC). We review the design and R&D studies for the CMS ECAL crystal calorimeter upgrade and present first test beam studies. Particular challenges at HL-LHC are the harsh radiation environment, the increasing data rates and the extreme level of pile-up events, with up to 200 simultaneous proton-proton (p-p) collisions. We also report on the R&D for the new readout and trigger electronics, which must be upgraded due to the increased trigger and latency requirements at the HL-LHC.

Highlights

  • The physics goals for the HL-Large Hadron Collider (LHC) phase (Phase II) [1,2] foresee precise measurements of the Higgs boson couplings and studies of rare SM processes, crucial for searches for new physics

  • We review the design and R&D studies for the Compact Muon Solenoid Experiment (CMS) electromagnetic calorimeter (ECAL) crystal calorimeter upgrade and present first test beam studies

  • We report on the R&D for the new readout and trigger electronics, which must be upgraded due to the increased trigger and latency requirements at the High-Luminosity upgrade of the LHC (HL-LHC)

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Summary

Introduction

The physics goals for the HL-LHC phase (Phase II) [1,2] foresee precise measurements of the Higgs boson couplings and studies of rare SM processes, crucial for searches for new physics To successfully exploit these data which will be collected during the HL-LHC phase, it is necessary to reduce the effects of the increased simultaneous interactions per bunch crossing (pileup (PU)). At the same time the calorimeters should provide performance similar to that delivered so far but with beam intensities that will result in 200 PU arising from a peak instantaneous luminosity of 5×1034cm−2s−1. This will be a difficult challenge for the endcap region (EE), due to the fact that the radiation levels will change by a factor of 100 between |η| =1.48 and |η| = 3.0. ECAL has excellent performance at 13 TeV [4] and in particular the photon energy resolution was 1-3% in EB and 2.5-4.5% in EE+ES

ECAL Barrel Upgrade
Motivations
Timing performance
Findings
Conclusions
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