Alignment of the Silicon Detectors of the ATLAS Experiment

The ATLAS Experiment is one of the four large detectors located at the
Large Hadron Collider at CERN in Geneva, Switzerland. Data taking
of ATLAS is expected to start in 2007. The reconstruction of
particle tracks is performed by silicon and drift tube based subdetectors.
In order not to degenerate the track measurements the position of the
silicon detector elements have to be  known to a precision better than
about 10 micrometers. This precision can be achieved by track based
alignment algorithms combined with measurements from hardware based
alignment techniques. The proposed alignment algorithms for the ATLAS
inner detector and their implementation into the common ATLAS
software framework are presented. First results from a testbeam
setup and from cosmic ray data are shown and discussed.