The ATLAS Inner Detector commissioning and calibration

The ATLAS Collaboration, Wahid Bhimji, Andy Buckley, Philip Clark, Robert Harrington, Victoria Martin

Research output: Contribution to journalArticlepeer-review


The ATLAS Inner Detector is a composite tracking system consisting of silicon pixels, silicon strips and straw tubes in a 2 T magnetic field. Its installation was completed in August 2008 and the detector took part in data- taking with single LHC beams and cosmic rays. The initial detector operation, hardware commissioning and in-situ calibrations are described. Tracking performance has been measured with 7.6 million cosmic-ray events, collected using a tracking trigger and reconstructed with modular pattern-recognition and fitting software. The intrinsic hit efficiency and tracking trigger efficiencies are close to 100%. Lorentz angle measurements for both electrons and holes, specific energy-loss calibration and transition radiation turn-on measurements have been performed. Different alignment techniques have been used to reconstruct the detector geometry. After the initial alignment, a transverse impact parameter resolution of 22.1+/-0.9 {\mu}m and a relative momentum resolution {\sigma}p/p = (4.83+/-0.16) \times 10-4 GeV-1 \times pT have been measured for high momentum tracks.
Original languageEnglish
Pages (from-to)787-821
Number of pages35
JournalEuropean Physical Journal C
Publication statusPublished - 2010


  • physics.ins-det


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