I'm Sorry Dave. I'm Afraid I Must Collide Proton Beams.

cache.boston.com — Assembly and installation of the ATLAS Hadronic endcap Liquid Argon Calorimeter. The ATLAS detector contains a series of ever-larger concentric cylinders around the central interaction point where the LHC's proton beams collide. Sep 9, 2008 View in Crawl 4