Abstract
The LHC is delivering collision data since November 2009 up to a 7 TeV center of mass energy world record. The ATLAS experiment has collected more than 1 nb−1 collision data until the end of April 2010. The ATLAS Liquid Argon (LAr) calorimeter system, operational since August 2006, has been carefully commissioned and checked using collision data as well as single beam data and cosmic data taken previously. This paper gives an overview of the ATLAS LAr calorimeters status and performance up to the latest 7 TeV collision data. Results on the LAr calorimeters high voltage, LAr temperature, purity and readout electronic stability as well as results on timing alignments and early collision performances are shown here. All indicates that the ATLAS LAr calorimeter system is well commissioned and shows good and promising performances for the physics at LHC era.
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