Speaker
Description
For the High-Luminosity LHC, the CMS experiment is replacing its endcap calorimeters with the High-Granularity Calorimeter (HGCAL), a 47-layer sampling calorimeter that uses roughly 26,000 hexagonal silicon modules and about six million readout channels to measure particle showers in fine spatial and timing detail. Texas Tech’s Advanced Particle Detector Laboratory is one of six Module Assembly Centers worldwide and is responsible for building nearly 5,000 of these modules in its cleanroom. This poster follows a module through the full production chain at TTU. It begins with pre-assembly validation: inspection of the baseplates, silicon sensors, and hexaboard readout electronics. It then covers the precision gantry assembly of the module stack, wire bonding of the sensor to the HGCROC front-end electronics, and encapsulation. It closes with post-assembly qualification, including current–voltage (IV) and pedestal/noise measurements used to grade each module before shipment. The poster then places this work in the context of the full detector. Finished modules are mounted onto cooled copper cassettes, which are stacked into the electromagnetic section and inserted between steel absorbers in the hadronic section. Finally, the poster discusses how HGCAL’s radiation tolerance, granularity, and precision timing will let CMS separate the 140–200 simultaneous collisions per bunch crossing expected at the HL-LHC, preserving and extending its physics reach through the 2030s.
