Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 39: Pixel Detectors II

T 39.8: Talk

Tuesday, March 16, 2021, 17:50–18:05, Tn

Irradiation burst study of Belle II PXD module components — Jochen Dingfelder¹, Georgios Giakoustidis¹, Martin Hensel², Matthias Hoek³, Florian Lütticke¹, Botho Paschen¹, •Jannes Schmitz¹, and Marike Schwickardi⁴ for the Belle II collaboration — ¹University of Bonn, Germany — ²HLL of Max-Planck-Society, Munich, Germany — ³University of Mainz, Germany — ⁴University of Göttingen, Germany

The Belle II detector started recording collision data in spring 2019. During physics runs in 2019 and 2020, 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 (800 nA) pencil beam of 855 MeV electrons was used to irradiate full system demonstrators in several spatially confined fiducial regions. In this talk, the results of these campaigns will be presented and compared to the observed impact of the irradiation bursts on the PXD modules installed inside Belle II.