Development of the CMS detector for the CERN LHC Run 3

TL;DR

The paper details comprehensive upgrades to the CMS detector for LHC Run 3, enhancing its components and systems to improve data collection and analysis capabilities starting in 2022.

Contribution

It presents the complete overhaul and upgrade of the CMS detector systems for Run 3, including new hardware, electronics, and computing infrastructure.

Findings

Enhanced detector performance for Run 3

Improved data acquisition and processing

Upgraded muon and calorimeter systems

Abstract

Since the initial data taking of the CERN LHC, the CMS experiment has undergone substantial upgrades and improvements. This paper discusses the CMS detector as it is configured for the third data-taking period of the CERN LHC, Run 3, which started in 2022. The entire silicon pixel tracking detector was replaced. A new powering system for the superconducting solenoid was installed. The electronics of the hadron calorimeter was upgraded. All the muon electronic systems were upgraded, and new muon detector stations were added, including a gas electron multiplier detector. The precision proton spectrometer was upgraded. The dedicated luminosity detectors and the beam loss monitor were refurbished. Substantial improvements to the trigger, data acquisition, software, and computing systems were also implemented, including a new hybrid CPU/GPU farm for the high-level trigger.