The ATLAS Inner Detector commissioning and calibration

THE ATLAS COLL. , G. AAD; MARIA TERESA DOVA ET AL

EUROPEAN PHYSICAL JOURNAL C - PARTICLES AND FIELDS

SPRINGER

Lugar: Berlin; Año: 2010 vol. 70 p. 787 - 821

1434-6044

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 datataking with single LHC beams and cosmic rays. The initial detector operation, hardware commissioning and in-situ alibrations 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 22:10:9 mm and a relative momentum resolution sp=p = (4:830:16)10􀀀4 GeV􀀀1 pT have been measured for high momentum tracks.