In the Belle II experiment, the Cherenkov ring detector is designed to identify fast charged particles. A charged particle emits photons when it moves through a medium faster than the speed of light. Photons are detected by position-sensitive sensors of individual photons. Background radiation causes damage to the crystal lattice of semiconductor detectors, which leads to an increase in dark current, that acts as a source of noise to our detected signal.
The purpose of the task is to assess the impact of radiation on the operation of the identification system by analyzing the supply currents of 420 hybrid avalanche photodiodes (HAPD) and to compare the obtained measurements with the expected values. We will also do a review of sensors that have been masked due to malfunctions.
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