ATLAS detector at CERN. Timelapse footage of a technical service taking place at the ATLAS detector at CERN, the European particle physics laboratory, Geneva, Switzerland. ATLAS (A Toroidal LHC Apparatus) is one of seven particle detectors constructed at CERN's Large Hadron Collider (LHC). The LHC, the world's largest and most powerful particle collider, began operating in 2008. Results from ATLAS, a detector the size of a 5-storey building, helped discover a particle consistent with the Higgs boson in 2012. Footage obtained in November 2014.