Abstract
Abstract The ATLAS Pixel Detector is the innermost detector of the ATLAS experiment at the Large Hadron Collider at CERN. It consists of 1744 silicon sensors equipped with approximately 80 million electronic channels, providing typically three measurement points with high resolution for charged particles emerging from the beam-interaction region, thus allowing the reconstruction of particle tracks and secondary vertices with very high precision. Before the start of LHC operations, the completed Pixel Detector was operated for many months under nominal conditions in the ATLAS experimental hall. This allowed for the optimization of the operating parameters of the system, and to qualify the detector with physics data from cosmic muons. After the commissioning phase was complete, the Pixel Detector was 97.5% operational during the first LHC pp collisions run. Noise occupancy and hit efficiency exceed the design specifications. The alignment is close enough to the ideal to allow good track reconstruction and invariant mass determination. A review of the commissioning and first operational experience with the Pixel Detector will be presented. This will include detector calibration procedures, online data quality monitoring, module timing optimization and the status of the Pixel Detector during the first year of LHC operations.
Highlights
Introduction y The LHC and theATLAS experiment at CERN y The ATLAS Pixel DetectorDetector commissioning and operation y Current status y Operational safety y Online Monitoring y Beam backgrounds
A proton-proton collider located on the France-Switzerland border outside of Geneva y 27 km long ring previously housing LEP y 1232 superconducting dipole magnets y 7 TeV nominal beam energy y 1034 cm-2 s-1 nominal luminosity y 2808 proton bunches per beam y 25 ns bunch spacing (40 Mhz)
8-way VCSEL arrays y Information transferred to and from the detector over an 80 m optical link y 1 downlink per module, 1 uplink for L2, L1 and Disk, 2 uplinks for B-layer y Trigger and configuration sent at 40 Mbit/s from the readout driver’s Back of Crate (BOC) card y Data is transferred from the detector at different rates depending on location
Summary
A proton-proton collider located on the France-Switzerland border outside of Geneva y 27 km long ring previously housing LEP y 1232 superconducting dipole magnets y 7 TeV nominal beam energy y 1034 cm-2 s-1 nominal luminosity y 2808 proton bunches per beam y 25 ns bunch spacing (40 Mhz)
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