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On Sunday morning, Dec 6, 2009, the LHC achieved for the first time 900 GeV collisions under stable-beam conditions. This allowed ATLAS to fully ramp the high voltage of the inner most pixel and silicon-strip tracking detectors. The following displays show events from run 141749 taken during this period.
Two beams of circulating particles traveling in opposite directions at 1.18 trillion electron volts (TeV) produced the collisions. The Atlas, one of four major detectors in cathedral-sized rooms in the collider's underground tunnel at Geneva, had part of its equipment turned on and could register collisions. "They recorded a handful of collisions, and one of them looks quite nice, so it's on their web site," Dr Sutton said. Dr Sutton said the collisions occurred when the machine was ramped up briefly to 1.18 TeV.
Originally posted by woodwytch
And it does seem to be increasingly unlikely that a failed, Russian rocket launch was responsible after all.