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In order to reconstruct the trajectories of charged particles, ATLAS relies on an Inner Detector (ID) tracking system. Positions of signals (hits) recorded in individual detector elements are used to reconstruct the trajectories of charged particles inside the tracker and ultimately to estimate their kinematic parameters. The accuracy of this process is intrinsically limited by the finite resolution of the sensitive devices. Any detector misalignment adds to the uncertainty on the hit position and consequently on the reconstructed track parameters. Therefore, it is important to know the positions of all the ID detector elements within the detector volume as accurately as possible. The alignment procedure determines these positions and is necessary before any reliable physics measurements can be performed.
On this seminar I will explain which are the basics of a track-based alignment framework together with the experimental techniques developed and applied to detect and eliminate various systematics present in the ID alignment that the track-based cannot correct. Also I will talk about its performance during LHC Run-I and the last upgrades introduced in order to face the Run-II of LHC. Latest results obtained during the 2014-2015 ATLAS cosmic rays campaign would be also commented.