Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 113: Silicon trackers 6
T 113.4: Talk
Friday, March 8, 2024, 09:45–10:00, Geb. 30.22: kl. HS B
Upgrade of Belle II Vertex Detector with CMOS Pixel Technology — •Marike Schwickardi1, Ariane Frey1, Yannik Buch1, Benjamin Schwenker1, Maximilian Babeluk2, Ajit Kumar4, Ludovico Massaccesi3, Christian Finck4, Jerome Baudot4, Bernhard Pilsl2, and Christian Irmler2 — 1Georg-August Universität, 37077 Göttingen, Germany — 2Institute of High Energy Physics, Austrian Academy of Sciences, 1050 Vienna, Austria — 3Dipartimento di Fisica, Università di Pisa, I-56127 Pisa, Italy — 4Université de Strasbourg, CNRS, IPHC, UMR 7178, 67037 Strasbourg, France
The Belle II experiment at KEK in Japan considers upgrading its vertex detector system to address the challenges posed by high back-ground levels caused by the increased luminosity of the SuperKEKB collider. One proposal for upgrading the vertex detector aims to install a 5-layer all monolithic pixel vertex detector based on fully depleted CMOS sensors in 2027. The new system will use the OBELIX MAPS chips to improve background robustness and reduce occupancy levels through small and fast pixels. This causes better track finding, especially for low transverse momenta tracks elow 100 MeV. During the summer of 2023, electron-beam tests at DESY were conducted on the TJ-Monopix2, which served as the precursor to the OBELIX sensor. Initial measurements on irradiated modules, subjected to Protons at 5×1014 neq/cm2, were performed. Results from the laboratory and test beam evaluations, focusing on pixel response, efficiency, and spatial resolution, will be presented.
Keywords: Pixel-Detector; Radiated Sensors