Speaker
Description
The High Luminosity Large Hadron Collider (HL-LHC) operation will push the CMS experiment to its limits, with an instantaneous peak luminosity of $7.5 \times 10^{34} \, \text{cm}^{-2}\text{s}^{-1}$ and an integrated luminosity of $300 \, \text{fb}^{-1}$ per year. This environment will expose the CMS Inner Tracker (IT) Pixel Detector at the center of CMS to unprecedented radiation, with a 1 MeV neutron equivalent fluence of $2.3 \times 10^{16} \, \text{neq}/\text{cm}^2$ and a total ionizing dose of $1.2 \, \text{Grad}$. To endure these conditions and handle hit rates of $3.2 \, \text{GHz}/\text{cm}^2$ while managing a pileup of 140-200 collisions per bunch crossing, the new IT system will employ a highly granular design with thin silicon sensors, small pixels ($25 \times 100 \, \mu\text{m}^2$), and fast, radiation-hard electronics based on a $65 \, \text{nm}$ CMOS ASIC developed by the RD53 collaboration. A novel serial powering scheme and high-bandwidth readout system will support the upgraded modules, while lightweight carbon-fiber mechanics with two-phase CO$_2$ cooling will ensure structural integrity. The design will extend the tracking coverage up to $|\eta| \approx 4$. This contribution presents an overview of the CMS IT upgrade project, focusing on the ongoing activities and status of the module production of all the IT subsystems.
| Primary experiment | CMS collaboration |
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