Speaker
Description
The High Luminosity LHC (HL-LHC) aims to achieve instantaneous luminosities a factor of 5 to 7.5 larger than the nominal LHC value. In ten years of running, integrated luminosities of 3000 to 4000 fb−1 will be delivered to the CMS experiment. During Long Shutdown 3, the entire CMS tracking system will be replaced in preparation for the HL-LHC to mitigate the increased radiation and data rate. It consists of an Inner Tracker (IT) based on silicon pixel modules, and an Outer Tracker. The innermost part of the IT will be exposed to extreme conditions such as unprecedented radiation levels of up to Φeq = 2.6E16 cm−2 (after 3000 fb-1) and a hit rate of 3.2 GHz/cm2. New modules relying on novel technologies are designed for the IT, which are hybrid detectors consisting of CMS readout chips manufactured in 65 nm CMOS (RD53B_CMS) and silicon pixel sensors with a pixel size of 25 x 100 µm2 and a thickness of 150 µm, coupled via fine-pitch flip-chip bump bonding. A novel serial powering scheme and high-bandwidth readout system will support the upgraded modules, while lightweight carbon-fiber mechanics with two-phase CO2 cooling will ensure structural integrity. The design will extend the tracking coverage up to |η| ≈ 4. This contribution presents an overview of the CMS IT upgrade project, including the ongoing activities and status of the module production of all the IT subsystems.
