SMuK 2023 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 123: Pixel/Belle II, Si/Other
T 123.3: Vortrag
Donnerstag, 23. März 2023, 16:20–16:35, REC/C213
Simulation of power lines for the Investigation of the Emergency Shutdown system of the DEPFET pixel detector — •Paula Scholz1, Florian Bernlochner1, Jochen Dingfelder1, Hans Krüger1, Botho Paschen1, Matthias Hoek2, Jannes Schmitz1, and Patrick Ahlburg1 for the Belle II collaboration — 1University of Bonn, Germany — 2Institut für Kernphysik JGU Mainz, Germany
The Belle II Pixel Detector (PXD) is based on DEpleted P-channel Field Effect Transistor (DEPFET) matrices. To control the sensors, voltage levels have to be switched by 20 V within a few nanoseconds per readout cycle (50 kHz). The voltage switching is implemented in Application Specific Integrated Circuits (ASICs), the so-called switchers, on the detector modules. These switchers have been observed to be vulnerable to sudden irradiation bursts, which can occur during beam loss events in the SuperKEKB accelerator. To safeguard the modules from damage caused by beam loss events, the modules have to be switched off as fast as possible when a loss of beam control is imminent. Several beam monitoring systems are employed in the experiment to detect these situations. On PXD hardware side it is investigated how the vulnerable channels can be switched off fast and securely. Therefore, an electronics circuit simulation of the complex PXD power system is being set up to understand the limitations and conduct studies of possible hardware modifications. This talk will concentrate on the necessary steps for creating such a simulation.