Technical Proposal for the Phase-II Upgrade of the CMS Detector

TLDR

The High Luminosity LHC will deliver about 2500 fb⁻¹ over ten years, substantially extending CMS’s mass reach for new particles and enabling deeper Higgs boson studies. The proposal aims to upgrade CMS for the High Luminosity LHC by addressing detector aging and enhancing its capability to isolate and precisely measure collision products through conceptual designs and performance plans. The upgrades involve conceptual designs, performance expectations, and infrastructure improvements, including installation logistics in the experimental area. Initial cost estimates for the upgrades are presented.

Abstract

This Technical Proposal presents the upgrades foreseen to prepare the CMS experiment for the High Luminosity LHC. In this second phase of the LHC physics program, the accelerator will provide to CMS an additional integrated luminosity of about 2500 fb-1 over 10 years of operation, starting in 2025. This will substantially enlarge the mass reach in the search for new particles and will also greatly extend the potential to study the properties of the Higgs boson discovered at the LHC in 2012. In order to meet the experimental challenges of unprecedented p-p luminosity, the CMS collaboration will need to address the aging of the present detector and to improve the ability of the apparatus to isolate and precisely measure the products of the most interesting collisions. This document describes the conceptual designs and the expected performance of the upgrades, along with the plans to develop the appropriate experimental techniques. The infrastructure upgrades and the logistics of the installation in the experimental area are also discussed. Finally, the initial cost estimates of the upgrades are presented.