Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 48: Pixel detectors III

T 48.1: Talk

Wednesday, April 1, 2020, 16:30–16:45, H-HS V

Optimization of the new Pixel Vertex Detector for Physics Running in the Belle II Experiment — •Markus Reif for the Belle II collaboration — Max Planck Institute for Physics

The Pixel Vertex Detector (PXD) is the innermost subdetector of the new Belle II detector at the asymmetric energy electron positron collider SuperKEKB in Tsubkuba, Japan. For Phase 3, 20 modules were installed, arranged cylindrically around the interaction point. Each module contains 192000 Depleted P-channel Field-Effect Transistor (DEPFET) pixels.

In Phase 3, which started in March 2019, for the first time physical data was taken with the 'full' detector.

To cope with inhomogeneities between pixels of PXD modules a dedicated software calculates a specific current that is added to each pixel to shrink the pedestal distribution. Since the modules suffer radiation damages in physics runs, these offsets have to be recalibrated frequently.

As a preparation step for the offset calibration, the pedestals of the modules have to be shifted to the lower region of the dynamic range, which is currently done by hand.

In this talk a newly developed software, which speeds up and simplifies this preparation step, is presented.