Commissioning of the ATLAS Pixel Detector with Cosmics Ray Data

The ATLAS Pixel Detector is the innermost detector of the ATLAS experiment at the Large Hadron Collider at CERN. It consists of silicon sensors equipped with approximately 80 M electronic channels and will allow to detect particle tracks and secondary vertices with very high precision. After connection of cooling and services and verification of their operation the ATLAS Pixel Detector is now in the final stage of its commissioning phase. Prior to the first beams expected in Autumn 2009, a full characterization of the detector was performed. Calibrations of optical connections, verification of the analog performance and special DAQ runs for noise studies were done. Combined operation with other subdetectors in ATLAS allowed to qualify the detector with physics data from cosmic muons. This paper will show all aspects of detector operation, including the monitoring and safety system, the DAQ system and calibration procedures. The summary of calibration tests on the whole detector as well as analysis of physics runs with cosmics data will be presented.