Speaker
Description
In preparation for the High-Luminosity LHC, the CMS experiment is upgrading its endcap calorimeters with the High-Granularity Calorimeter (HGCal), a novel imaging calorimeter featuring fine spatial segmentation and precise timing. The detector integrates silicon sensors in high-radiation regions and plastic scintillator tiles with SiPM readout in low-radiation regions. The scintillator-based ("SiPM-on-Tile") section consists of approximately 3900 detector modules ("tilemodules"), each hosting between 24 and 144 channels. Each channel consists of one SiPM collecting the light output from a scintillator tile (4 cm^2 to 25 cm^2, 3mm thickness) wrapped in on ESR reflective foil. The assembly of the detector components into tilemodules is fully automated, including the assembly of components in readout boards, production of machined and molded tiles, wrapping of the 300k tiles, and gluing of the tiles on the boards. A comprehensive set of automated quality control (QC) tests has been developed to ensure fully functional tilemodules. The QC tests range from tile size measurement, electrical validation of the boards at warm and cold temperatures, and initial calibration and characterization of the channel. This talk presents the assembly and QC procedures used to build the 3900 tilemodules, together with the results obtained from early production.