Dortmund 2021 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 89: Pixel Detectors IV

T 89.8: Vortrag

Donnerstag, 18. März 2021, 17:45–18:00, Tn

Characterization of Prototype Pixel Sensors for the CMS Inner Tracker at the High-Luminosity LHC — •Anna Liisa Puchert¹, Aliakbar Ebrahimi², Finn Feindt¹, Erika Garutti¹, Mohammadtaghi Hajheidari¹, Daniel Pitzl³, Peter Schleper¹, Jörn Schwandt¹, Georg Steinbrueck¹, and Irene Zoi¹ — ¹Institut für Experimentalphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Deutschland — ²Paul Scherrer Institut, Villingen, Switzerland — ³Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg

During the shutdown from 2025 to 2027 (LS3), the Large Hadron Collider (LHC) will undergo an upgrade. The luminosity will be increased to up to 7.5 × 10³⁵ cm⁻²s⁻¹. Consequently, the data rate as well as the particle flux through the detector will be increased. The silicon tracker of the CMS experiment will therefore need to be completely replaced. The sensors for the CMS Inner Tracker (IT) will have to fulfil stringent requirements, including high efficiency for hit detection (> 99 %) and excellent spatial resolution till the end of their lifetime. We report on performance measurements on prototype sensors. For this purpose, some of the sensors were irradiated to simulate the radiation after a certain runtime. The tests for efficiency and spatial resolution were performed at the DESY II test beam in Hamburg. Even after an irradiation of 2.1×10¹⁶ n_eq/cm², which approximately corresponds to the expected particle flux after 3000 fb⁻¹ for the first layer, the tested sensors still meet the requirements in terms of efficiency and resolution at bias voltages below 800 V.