Alignment of the Atlas Inner Detector

Details Alignment of the Atlas Inner Detector Alignment of the Atlas Inner Detector

2010-10-08

arxiv.org/abs/1010.1670v1

Physics

Instrumentation and Detectors

4 pages, Hadron Collider Physics Symposium 2010, conference proceedings

Scientific paper

ATLAS is one of the two general purpose detectors at the world's largest particle accelerator, the Large Hadron Collider (LHC). The LHC will be colliding proton beams at a center of mass energy {\surd}s= 14 TeV and is currently operating at {\surd}s = 7 TeV. During the commissioning phase since September 2008, the ATLAS recorded cosmic-rays data and proton-proton collisions at {\surd}s = 0.9 TeV. This data has extensively been used for the alignment and calibration of various sub-detectors. The ATLAS detector has a precision tracking system installed around the beam pipe for the measurements of the position and momentum of charged particles emerging from the collisions. The precise knowledge of misalignments of the tracking devices is crucial for the important physics measurements. At the time of writing the alignment corrections were obtained from the cosmic-rays and 0.9 TeV proton-proton collisions data, while the large statistics of proton-proton collisions at 7 TeV was used to check the performance of the alignment. This article gives an overview of the alignment strategy and the alignment performance using the data collected from proton-proton collisions at 7 TeV.

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