The Silicon Vertex Detector of the Belle II Experiment
November 16, 2022
The Belle II experiment started taking data at the SuperKEKB collider in spring 2019. As part of
the inner tracker system, the silicon vertex detector (SVD) has been operating reliably. It provided
good data quality, a good signal-to-noise ratio, an excellent hit efficiency greater than 99% and
precise spatial resolution, which result in good tracking efficiency. The current occupancy, which
is dominated by beam-background hits, is around 0.5% in the innermost layer and does so far not
cause problems to the SVD data reconstruction. Due to the estimated increase in occupancy at
higher luminosity in the next years, specific strategies aiming to preserve the tracking performance
were developed and tested on data. Strip noise, sensor currents and depletion voltages have
been measured to check for the first effects of radiation damage. So far no harmful impact on
the detector performance has been observed. Extrapolations for the next years do not imply
upcoming problems, although these background estimates are still affected by large uncertainties.
No damage due to beam losses or sudden intense radiation bursts were detected.
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