Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 35: Semiconductor Detectors - Radiation Hardness, New Materials and Concepts
T 35.8: Vortrag
Dienstag, 16. März 2021, 17:45–18:00, Tj
Effects of gamma radiation on DEPFET pixel sensors for the Belle II experiment — Jochen 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.