SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 45: Si-Strips, Pixel

T 45.2: Vortrag

Dienstag, 21. März 2023, 17:15–17:30, WIL/C307

Producing high quality and long-lasting modules for the ATLAS ITk strip detector — •Ben Brüers — Deutsches Elektronen-Synchrotron DESY, Zeuthen, Germany

For the high luminosity phase of the LHC, the ATLAS collaboration plans to upgrade its current tracking detector with a new, all silicon pixel and strip detector, referred to as Inner Tracker (ITk). Core components of the ITk strip detector are modules that consist of sensors and printed circuit flex boards carrying the read-out and powering chips. To ensure reliable operation of the ITk strip detector, all module components are extensively tested and characterised before module building. After and during module assembly, the quality of the modules is additionally assessed to verify that they fulfil the high standards determined to lead to the required quality by the ATLAS collaboration. This talk will give an overview of the means of ensuring this level of quality for the modules and their components. Special focus will be on stress-tests of ASIC stuffed printed circuit boards and on temperature cycling of modules. During the quality assessment of a module and its components it is paramount to not damage the wire-bonds connecting the ASICs and the printed circuit boards, e.g. through resonances induced by the cooling or vibrations. A new approach to determine the resonance frequency of the wire-bonds is presented in this talk. Knowledge of this frequency is also relevant to prevent damages due to wire-bond oscillations excited by currents through the wires in the 2 T magnetic field of the ATLAS detector.