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T: Fachverband Teilchenphysik
T 95: Pixel Detectors 3
T 95.3: Talk
Thursday, March 24, 2022, 16:45–17:00, T-H26
Irradiation burst study of Belle II PXD module components — Florian Bernlochner1, Jochen Dingfelder1, Georgios Giakoustidis1, Matthias Hoek2, Botho Paschen1, and •Jannes Schmitz1 for the Belle II collaboration — 1University of Bonn, Germany — 2University of Mainz, Germany
The Belle II detector started recording collision data in spring 2019. During physics runs, unexpected irradiation burst events occurred, which exposed the inner detectors and especially the PXD (PiXel Detector) to unwanted levels of prompt irradiation. Dedicated measurement campaigns were carried out at the Mainz Microtron (MAMI), which aimed to reproduce the observed effects of irradiation bursts on the PXD in Belle II. To this end, a focused high intensity (up to 10uA) pencil beam of 855 MeV electrons was used to irradiate full system demonstrators in several spatially confined fiducial regions. During first campaigns in 2020 the observed failure mode could be reproduced and restricted to vulnerable regions in one specific module component. In this talk, the results of the latest measurement campaign in December 2021 will be presented, focussing on possible protective measures against the impact of irradiation bursts on the PXD modules installed inside Belle II.