CMS Inner Tracker module production and qualification for the HL-LHC Upgrade

Abstract The High-Luminosity Large Hadron Collider (HL-LHC) operation will push the CMS experiment to its limits with a peak instantaneous luminosity of 7.5 × 10 34 cm -2 s -1 . This demanding environment will expose the CMS Inner Tracker (IT) pixel detector to unprecedented radiation levels and extreme hit rates. To withstand these conditions and manage the high pileup expected during operation, the new IT system features an optimized layout with thin silicon sensors, small pixel sizes, and fast, radiation-hard electronics based on advanced CMOS technology developed by the RD53 collaboration. Currently, pre-production modules are under construction, and extensive testing is ongoing to validate both the detector components and the associated quality control procedures. In the coming months, full-scale production of IT modules will begin. This contribution provides an overview of the IT upgrade and summarizes the status of module production at the assembly sites, highlighting the results from testing and qualification.