Title: The ATLAS Experiment: The 2009 Run and Prospects for Top Physics in 2010


After 20 years of design and construction, the ATLAS detector has recorded successfully the first LHC collisions last November and December. I will review the performance of the ATLAS detector in this first collision run at sqrt(s)=900 GeV. I will highlight in particular the performance of the main LBL detector responsability: the pixel detector. We now look forward to the 2010 physics run at increased energy and luminosity. I will review how establishing a top quark signal is of great importance for the ATLAS physics program, and will discuss the prospects for measuring the top quark pair cross-section in the next year.