First ATLAS 7TeV collisions recorded, 30th March 2010. (Image: ATLAS Experiment/CERN)

After ramping of the beams to 3.5 TeV and tuning, final checks, and some emotions due to an unforeseen beam dump, the 7 TeV collisions finally appeared on the on-line monitors of the ATLAS Control Room.

A new energy window is open for the scientists to look through!