ATLAS SemiConductor Tracker: Operation and performance

The SemiConductor Tracker (SCT) is a silicon strip detector and one of the key precision tracking devices in the Inner Detector of the ATLAS (A Toroidal LHC ApparatuS) experiment at CERN. The SCT installation in the ATLAS experimental cavern was completed in 2007 and it has been operational since then. An extensive commissioning phase followed, during which calibration data was collected and the performance of the system was studied. The SCT was ready for the first LHC proton-proton collisions and it continues recording data successfully since then. In this paper, the current status, operation and performance of the SCT is reviewed, including results from data-taking periods in 2010 and 2011.