A hadron collider is a very large particle accelerator built to test the predictions of various theories in particle physics and high-energy physics. A hadron collider uses underground tunnels and vast amounts of energy to cause closely monitored collisions of two particle beams in order to detect and study hadrons.
- Intersecting Storage Rings (ISR), CERN, in operation 1971-1984.
- Super Proton Synchrotron (SPS), CERN, used as a hadron collider 1981-1984.
- Tevatron, Fermi National Accelerator Laboratory (Fermilab), in operation 1983-2011.
- Large Hadron Collider (LHC), CERN, in operation since 2008.
Other underground particle accelerators at CERN are connected to the Large Hadron Collider and have been used in conjunction with it.