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T: Fachverband Teilchenphysik
T 12: Silicon Detectors II
T 12.4: Vortrag
Montag, 16. März 2026, 17:00–17:15, KH 01.022
Core column issue investigation on ATLAS ITk pixel detector modules in Siegen — Markus Cristinziani1, Qader Dorosti1, Olivier Fox1, Daniel Groth1, •Luke Hammer1, Stefan Heidbrink2, Lasse Jäderberg1, Nils Krengel1, Leonie Krippendorf1, Denise Müller1, Jason Müller1, Lina Reifenberg1, Noah Siegemund1, Waldemar Stroh2, Darshil Vagadiya1, Wolfgang Walkowiak1, Jens Winter2, Michael Ziolkowski2, and Alessia Zuev1 — 1Experimentelle Teilchenphysik, Center for Particle Physics Siegen, Universität Siegen — 2Elektronikentwicklungslabor Physik, Universität Siegen
The High-Luminosity Large Hadron Collider (HL-LHC) upgrade will substantially increase the LHC’s instantaneous luminosity, requiring a complete replacement of the ATLAS Inner Detector with the new all-silicon Inner Tracker (ITk). For the ITk pixel quad modules, a silicon sensor is connected to four front-end readout chips based on the ITkPix application-specific integrated circuit. During module production, characteristic inefficiencies in multiple columns of pixels, referred to as core column issues, were observed in ITkPix v1.1 and v2 quad modules. In this talk, results from dedicated investigations of these inefficiencies are presented. These studies in Siegen use and extend electrical testing tools developed by the collaboration. The observed response patterns are categorized and their impact on module performance is assessed. These investigations provide insight into the core column behavior observed during production and support quality assurance for reliable module operation in the future ATLAS ITk.
Keywords: ATLAS experiment; ITk pixel detector; HL-LHC upgrade; Pixel module testing; Core column issues