http://www.sciencemag.org/news/2019/01/european-physicists-unveil-plans-particle-collider-would-be-longer-panama-canal

An artist’s impression of a particle collision in CERN’s future collider

European particle physicists today released a conceptual design for a successor to the world’s biggest atom smasher, the 27-kilometer-long Large Hadron Collider (LHC), which straddles the border between Switzerland and France. The report calls for an even bigger accelerator, that would be 100 kilometers in circumference, to study in detail the Higgs boson, the weird new particle that the LHC discovered to great fanfare in 2012. The new machine, known for the moment as the Future Circular Collider (FCC), would cost €9 billion. It would begin operations around 2040, after the LHC is scheduled to shut down, according to a statement issued by CERN, the European particle physics laboratory near Geneva, Switzerland.