Alignment of the ATLAS Inner Detector tracking system

The Large Hadron Collider (LHC) at CERN is the world's largest particle accelerator. After a successful start run at 900 GeV in 2009, it will collide, during 2010, two proton beams at an unprecedented centre of mass energy of 7 TeV. ATLAS is one of the four multipurpose experiments that will record the products of the LHC proton‐proton collisions. ATLAS is equipped, among others, with a charged particle tracking system built on two different technologies: silicon planar sensors and drift‐tube based detectors constituting the ATLAS Inner Detector (ID). We will present the outline of the track based alignment approaches, their code implementation within the ATLAS computing framework and their results when aligning the real detector. So far the proposed alignment algorithms have been applied on the real data recorded from both: the LHC collisions and cosmic ray data as well. Results will be shown using 2009 and 2010 LHC data. Finally the impact of the alignment on physics measurements will be discussed.