Speaker
Description
For the upcoming high-luminosity LHC, the endcap calorimeters of the CMS experiment will be replaced by the high-granularity calorimeter (HGCAL). HGCAL is a sampling calorimeter using both silicon and scintillator as active materials in different regions depending on the radiation dose. The scintillator-based part of HGCAL consists of 4000 detector modules, each hosting between 24 and 144 plastic scintillator tiles and SiPMs, covering a total area of 370 m² with 280k readout channels. Up to five tile modules are read out through a motherboard, which houses data concentrator ASICs and provides an optical link to the Serenity back-end boards. In this contribution, we introduce HGCAL's scintillator section and present how the system was validated: First, we have tested the complete pre-series readout chain in a particle beam while operating in a 3T magnetic field. Secondly, we have built and tested a stainless steel absorber stack instrumented with fifteen tile modules, with the goal to study the calorimetric and timing performance. And finally, we have commissioned a complete horizontal slice of scintillator tile modules for system tests under realistic grounding and powering conditions. The successful conclusion of these milestones forms an important contribution towards the construction and operation of HGCAL.
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