Clip 2 of video by CERN regarding the LHC (Large Hadron Collider) replacing the LEP (Large Electron Positron collider). Video date- 1998. Video source- http://cdsweb.cern.ch/collection/Video%20Movies The detector they refer to at the beginning of the clip is more than likely the ATLAS experiment (A Toroidal LHC ApparatuS) as this is the largest and most well known detector proposed.