ATLAS status, performance and first results
Prof. Lucia Masetti (Institut für Physik, Mainz)

The ATLAS detector at the Large Hadron Colider (LHC) has recorded 50 pb^{-1}~pb of data at a centre-of-mass energy of 7 TeV this year.
Within half a year from the start of the data taking at 7 TeV the peak luminosity could be increased by several orders of magnitude, the first physics results were published and more are to come shortly.
This talk will start with an overview over the detector status and its performance for physics objects, followed by a selection of the first physics results and an outlook on the physics potential for 2011.