Design and construction of the CMS Inner Tracker for the HL-LHC Upgrade

The High Luminosity Large Hadron Collider (HL-LHC) at CERN is expected to collide protons at a center -ofmass energy of 14 TeV and to reach the unprecedented peak instantaneous luminosity of 5-7 . 5 x 10 34 cm -2 s -1 with an average number of pileup events of 140-200. This will allow the ATLAS and CMS experiments to collect integrated luminosities up to 3000-4000 fb -1 during the project lifetime. To cope with this extreme scenario the CMS detector will be substantially upgraded before starting the HL-LHC, a plan known as the CMS Phase -2 upgrade. The entire CMS silicon pixel detector will be replaced and the new detector will feature increased radiation hardness, higher granularity and capability to handle the higher data rate and the longer trigger latency. In this contribution, the Phase -2 upgrade of the CMS silicon pixel detector will be reviewed, focusing on the features of the detector layout and technological choices and summarizing the R&D activities.