First beam seen by ATLAS

I also wanted to share the first beam events seen by ATLAS:





(It's really just the beam smashing into the collimator just before the detector.)

The circular views are cross-sections of the ATLAS detector (so the beam is coming into/out of the page). Green indicates splashes of energy in the calorimeter (calorimeter = energy detector; think high school chemistry class with a styrofoam cup). In the second picture, the red dots are where muons crossed the muon detectors ("hits").

And, for a laugh:



A bientôt!