Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 12: Detectors 1 (electronics)

T 12.6: Talk

Monday, March 4, 2024, 17:15–17:30, Geb. 30.23: 2/1

Investigation of the Belle II Pixel Detector Power Supply Network — Patrick Ahlburg, Florian Bernlochner, Jochen Dingfelder, Hans Krüger, •Botho Paschen, and Paula Scholz — University of Bonn

The Belle II PiXel Detector (PXD) is based on modules with DEpleted P-channel Field Effect Transistor (DEPFET) sensors. Each module is powered by 23 dedicated power supply channels. Since the Power Supplies (PS) are located outside the Belle II detector, 15 m long cables and several decoupling capacitor stages are necessary in the powering path.

To better protect modules in case of beam loss events an active shutdown procedure is proposed. In addition to PS regulators shutting down, nets on the PS side are actively shorted by switches to reduce voltage settling times.

Because of the complicated powering path structure a dedicated characterization and simulation of all system components is necessary for a successful implementation of the active shutdown. The status of the investigations using different measurement and simulation tools (a.o. time domain reflectometry, network analyzer, LTspice, HyperLynx) are presented in this talk.

Keywords: Power Supply; Belle II; PXD