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T: Fachverband Teilchenphysik

T 43: Invited Topical Talks I

T 43.2: Invited Topical Talk

Mittwoch, 18. März 2026, 14:15–14:45, AudiMax

Entering the high-granularity calorimetry era: the CMS HGCAL upgrade — •Antoine Laudrain — Deutches Elektronen-Synchrotron, Hamburg, Germany

The LHC has seen a successful data taking over the last 15 years. However, 90% of the planned dataset will be recorded in the upcoming High-Luminosity phase of the LHC (HL-LHC). While this enormous dataset will enable the high-precision measurements on a range of topics, the LHC experiments will come under a high stress: radiation damage, detector occupancy, data rate, etc. To cope with these challenging conditions, the CMS experiment is upgrading most of its subsystems, including its end-cap calorimeters: they will be completely removed and replaced by the High-Granularity Calorimeter. The HGCAL uses a mixture of silicon sensors in the high-radiation areas, and plastic scintillator tiles readout by SiPMs in the lower radiation areas. It totals more than 6 million channels, 2 orders of magnitude more than the current calorimeter system. The scintillator section alone is composed of 4000 modules hosting more than 270'000 individual channels which poses challenges for the production scalability, especially automating the assembly and quality control. This contribution will present the HGCAL upgrade and the German contributions to its construction: DESY, one of the two assembly centres worldwide for the scintillator section, will build and test half of these modules, while KIT is involved in the readout electronics in.

Keywords: HL-LHC; CMS; Calorimetry; High-Granularity