Test Beam Studies of Prototype Module and Test Measurements of MaPSA for The CMS Outer Tracker Phase-2 Upgrade

Abstract

This thesis presents contributions to key aspects of the CMS Outer Tracker upgrade, including both 2S and PS module development. The first part focuses on the assembly and characterization of prototype 2S modules, with a sensor thickness of 240μm. The 2S prototype module demonstrated excellent performance, as validated through electrical and beam tests conducted at DESY, achieving a particle detection e ciency above 99.9% and a stub detection e ciency exceeding 99.7%. Beam tests also confirmed the design concept for discriminating low transverse momentum tracks, showing agreement with expectations. The second part focuses on the development of a test stand for the quality assurance of the Macro Pixel Sub-Assembly (MaPSA), a main component of the PS module. Established to support the production of over 1250 PS modules at DESY, the test stand facilitates the testing and grading of MaPSAs. A comprehensive electrical testing workflow was implemented, including current measurements, pixel functionality tests, bump bonding evaluations, and threshold equalization. The threshold equalization procedure was opti- mized to achieve precise alignment of pixel responses, minimizing the risk of misclassifying untrimmable pixels. Through successful evaluations of prototype MaPSAs, the test stand has demonstrated its reliability and readiness for the production phase.