Abstract
Calorimetry at the High Luminosity LHC (HL-LHC) faces two enormous challenges, particularly in the forward direction: radiation tolerance and unprecedented in-time event pileup. To meet these challenges, the CMS experiment has decided to construct a High Granularity Calorimeter (HGCAL), featuring a previously unrealized transverse and longitudinal segmentation, for both electromagnetic and hadronic compartments. This will facilitate particle-flow-type calorimetry, where the fine structure of showers can be measured and used to enhance particle identification, energy resolution and pileup rejection. The majority of the HGCAL will be based on robust and cost-effective hexagonal silicon sensors with about 1cm2 or 0.5cm2 hexagonal cell size, with the final 5 interaction lengths of the hadronic compartment being based on highly segmented plastic scintillator with on-scintillator SiPM readout. We present an overview of the HGCAL project, including the motivation, engineering design, readout concept and simulated performance.
Highlights
The discovery in 2012 of the Higgs boson by the ATLAS and CMS experiments at the LHC [1, 2] is a major breakthrough in the understanding of the fundamental interactions
We present an overview of the High Granularity Calorimeter (HGCAL) project, including the motivation, engineering design, readout concept and simulated performance
If new particles are found during the Phase-I data taking period of the LHC, aiming at accumulating 300 fb−1 by 2023, their properties will have to be determined precisely to disentangle between various models beyond standard model (SM)
Summary
- HGCAL: a High-Granularity Calorimeter for the endcaps of CMS at HL-LHC A.-M. - Radiation hardness study of Silicon Detectors for the CMS High Granularity Calorimeter (HGCAL) E. - Construction and first beam-tests of silicon-tungsten prototype modules for the CMS High Granularity Calorimeter for HLLHC S.
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