The ATLAS Inner Detector commissioning and calibration

Understand

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.