Test beam performance of a CBC3-based mini-module for the Phase-2 CMS Outer Tracker before and after neutron irradiation

TL;DR

This study evaluates the performance of a CMS detector module prototype, based on CBC3 ASIC, in a test beam before and after neutron irradiation, demonstrating its suitability for high-radiation environments in the HL-LHC upgrade.

Contribution

It presents the first performance assessment of a CBC3-based module for the CMS Outer Tracker, including irradiation effects, showing it meets the necessary operational requirements.

Findings

Module provides efficient tracking after irradiation.

Performance remains stable before and after neutron exposure.

Prototype satisfies the CMS upgrade specifications.

Abstract

The Large Hadron Collider (LHC) at CERN will undergo major upgrades to increase the instantaneous luminosity up to 5-7.5$\times10^{34}$ cm$^{-2}$s$^{-1}$. This High Luminosity upgrade of the LHC (HL-LHC) will deliver a total of 3000-4000 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 13-14 TeV. To cope with these challenging environmental conditions, the strip tracker of the CMS experiment will be upgraded using modules with two closely-spaced silicon sensors to provide information to include tracking in the Level-1 trigger selection. This paper describes the performance, in a test beam experiment, of the first prototype module based on the final version of the CMS Binary Chip front-end ASIC before and after the module was irradiated with neutrons. Results demonstrate that the prototype module satisfies the requirements, providing efficient tracking information, after being irradiated with a total fluence comparable to the one expected through the lifetime of the experiment.