Prototyping and qualification of 2S modules for the CMS Outer Tracker upgrade at the HL-LHC

TL;DR

This paper discusses the development, assembly, and testing of 2S silicon sensor modules for the CMS Outer Tracker upgrade at the HL-LHC, focusing on qualification procedures to ensure reliable operation.

Contribution

It presents the assembly procedures and qualification test results for 2S modules, advancing the readiness of tracker modules for the HL-LHC upgrade.

Findings

Successful qualification of 2S modules through electronic, thermal, and vibration tests

Development of assembly procedures ensuring module reliability

Preparation of modules for high-luminosity LHC operation

Abstract

In preparation for the High Luminosity LHC, the entire tracker detector of the CMS experiment will be exchanged as part of the Phase-2 Upgrade. The new Outer Tracker will comprise approximately 13,000 silicon sensor modules, of which 7608 are "2S modules" consisting of two parallel mounted silicon strip sensors, and 5592 are "PS modules" consisting of one pixel and one strip sensor in a single module. These modules provide tracking information to the Level 1 trigger by correlating the hit information of both sensor layers, allowing discrimination of particle tracks by their transverse momentum. To guarantee successful operation during data-taking, the production of the outer tracker modules has to fulfill strict requirements. This note will discuss the assembly procedures as well as some key results of the electronic, thermal and vibration tests performed at CERN for qualifying the 2S module design and for preparing the module assembly procedures.