Alignment of the Atlas Inner detector

The ATLAS detector at LHC has an innermost charged particle precision tracking system for measurement of the trajectories of the charged particles emerging out of proton-proton collisions. To achieve its physics goals the alignment of the tracking detector elements should be known to a precision of a few microns. However, due to the large number of tracking devices, this poses a real challenge. This slide gives a brief overview of the inner detector alignment procedures employed at ATLAS and presents the alignment performance using the data collected from proton-proton collisions at √s = 7 TeV.