This tunnel would house both the FCC-ee, an electron-positron collider, and the FCC-hh, a new proton-proton colliding machine. The FCC-ee, with a proposed 90-350 GeV energy would be used to ...

but it is estimated that at least two-thirds of the cost of building the FCC-ee will come from CERN’s 24 member states. Four committees will now review the feasibility study, beginning with CERN’s ...