Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 95: Pixel Detectors 3

T 95.1: Vortrag

Donnerstag, 24. März 2022, 16:15–16:30, T-H26

Effects of gamma radiation on DEPFET pixel sensors for the Belle II experiment — •Georgios Giakoustidis¹, Jochen Dingfelder¹, Ariane Frey², Botho Paschen¹, 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 E_CM = 10.58 GeV with an instantaneous luminosity of 8·10³⁵ cm⁻²s⁻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.