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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 componentsJochen 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.

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