ATLAS Pixel Detector Operational Experience and Performance at the Large Hadron Collider

The tracking performance of the ATLAS detector relies critically on its 4-layer Pixel Detector. As the closest detector component to the interaction point, this detector is subjected to a significant amount of radiation over its lifetime. At the start of the LHC proton-proton collision RUN3 in 2022, the innermost layer IBL, consisting of planar and 3D pixel sensors, had received an integrated fluence of approximately Φ = 1 × 10^15 1 MeV neq/cm2. The ATLAS collaboration is continually evaluating the impact of radiation on the Pixel Detector. In this talk the key status and performance metrics of the ATLAS Pixel Detector are summarised, and the operational experience and requirements to ensure optimum data quality and data taking efficiency will be described, with special emphasis to radiation damage experience. A quantitative analysis of charge collection, dE/dX, occupancy reduction with integrated luminosity, underdepletion effects, effects of annealing will be presented and discussed, as well as the operational issues and mitigation techniques adopted for the LHC Run3.