ATLAS Pixel Detector System Test and Cosmic Run

The pixel Detector is the innermost sub detector of ATLAS (A Toroidal LHC Apparatus) experiment, a general purpose detector at LHC (Large Hadron Collider). People kept working on the Atlas Pixel Detector for a decade, while the most recent action was the so-called "system test". This series of work was aimed to verify that the integrated assembly will have expected performance upon installation into ATLAS. Here we will introduce the whole procedure of the system test, including peripheral service test, optoboard and module calibration, cosmics data taking, and connectivity test.