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T: Fachverband Teilchenphysik

T 37: Silicon trackers 2

T 37.4: Talk

Tuesday, March 5, 2024, 16:45–17:00, Geb. 30.22: kl. HS B

Performance of CMS Inner Tracker pixel assemblies for the Phase-2 Upgrade — •Bianca Raciti, Massimiliano Antonello, Erika Garutti, Chin-Chia Kuo, Jörn Schwandt, and Georg Steinbrück — University of Hamburg, 22761, Luruper Chaussee 149, Hamburg, Germany

During Long Shutdown 3, the entire CMS Tracking System will be replaced to operate during the High Luminosity LHC running phase with considerably increased luminosity. The pixel sensor modules for the CMS Inner Tracker will have to fulfill stringent requirements to operate in an extremely harsh radiation environment and to cope with the high data readout rate.

An extensive campaign has taken place to characterize the first half-size pixel chip demonstrator (RD53A), which led to the submission and production of the first full-size prototype chip (RD53B_CMS).

Sensor-readout chip assemblies have been extensively tested both in the laboratory and at the CERN and DESY testbeam facilities.

This study presents results on the analysis of testbeam data acquired with RD53B_CMS assemblies irradiated to fluences up to Φ_eq=1.0×10¹⁶ N_eq cm⁻². For all investigated fluences, the requirement of reaching a hit efficiency є_hit>99% has been met, while keeping the percentage of pixels masked as noisy below 1%. Additionally, measurements of crosstalk levels observed in RD53B_CMS assemblies equipped with final design pixel sensors will be presented.

Keywords: Testbeam; Crosstalk; RD53B_CMS; Pixel detectors; Phase-2 upgrade