Current status of the CMS Inner Tracker upgrade for HL-LHC

TL;DR

The paper reviews the design, technological choices, and validation processes for the CMS Inner Tracker upgrade, which is essential for handling the increased collision rates during the HL-LHC era starting in 2030.

Contribution

It provides a comprehensive overview of the CMS Inner Tracker upgrade, including design decisions, prototype validation, and production preparations for the HL-LHC.

Findings

Successful validation of tracker prototypes.

Key technological innovations for high-rate data handling.

Preparation steps for large-scale production.

Abstract

During the High Luminosity programme of the LHC collider (called HL-LHC), planned to start in 2030, the instantaneous luminosity will be increased from \num{\sim 2e34}~\si{cm^{-2}s^{-1}} to an unprecedented figure of about \num{\sim 7.5e34}~\si{cm^{-2}s^{-1}}. This will allow the Compact Muon Solenoid (CMS) to collect up to \num{\sim 4000}~\si{fb^{-1}} of integrated luminosity over a decade. In order to cope with the much higher pp-collisions rate, CMS will undergo an extensive improvement known as \pII upgrade: in particular, the silicon tracker system will be entirely replaced to comply with the extremely challenging experimental conditions. This contribution will review the main upgrades of the CMS Inner Tracker and will present the most relevant design and technological choices. Moreover, the ongoing validation of prototypes and the preparation for the large-scale production will be discussed.