Schopper advocated a less energetic hadron, or proton, collider reaching about 9 TeV in each beam to sit above the ring of magnets for CERN's Large Electron-Positron (LEP) collider, a circular ...

The LHC itself replaced a previous electron–positron collider in the same tunnel, called LEP, that was built in the 1980s. But CERN hosts many other experiments and technology programmes ...