The ATLAS Inner Detector commissioning and calibration

Journal article

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 μm and a relative momentum resolution σp/p=(4. 83±0. 16)×10-4 GeV-1×pT have been measured for high momentum tracks. © 2010 CERN for the benefit of the ATLAS collaboration.

Authors: Aad, G; Abbott, B; Abdallah, J; Abdelalim, A; Abdesselam, A

• Publication status: Published
• Journal: EUROPEAN PHYSICAL JOURNAL C
• Volume: 70
• Issue: 3
• Pages: 787-821
• Publication date: 2010-12-01
• DOI: 10.1140/epjc/s10052-010-1366-7
• EISSN: 1434-6052
• ISSN: 1434-6044
• Language: English