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Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 35: Semiconductor Detectors - Radiation Hardness, New Materials and Concepts

T 35.8: Talk

Tuesday, March 16, 2021, 17:45–18:00, Tj

Effects of gamma radiation on DEPFET pixel sensors for the Belle II experimentJochen Dingfelder1, Ariane Frey2, •Georgios Giakoustidis1, Botho Paschen1, Harrison Schreeck2, Benjamin Schwenker2, and Marike Schwickardi2 for the Belle II collaboration — 1University of Bonn, Germany — 2University of Göttingen, Germany

For the Belle II experiment at KEK (Tsukuba, Japan) the KEKB accelerator was upgraded to deliver e+e collisions at a center of mass energy of ECM = 10.58 GeV with an instantaneous luminosity of 8 · 1035 cm−2 s−1. As the innermost part of the Belle II detector, the PiXel Detector (PXD), based on DEpleted P-channel Field Effect Transistor (DEPFET) technology, is most exposed to radiation from the accelerator. Prototypes as well as a module from the final Belle II production batch were irradiated with X-rays to doses up to 20 Mrad, corresponding to the expected lifetime exposure. The performance of the DEPFET sensors and front-end electronics will be presented and the results of two recent campaigns will be compared to previous results.

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