Towards Future Circular Colliders

The international Future Circular Collider (FCC) study, launched in 2014, is finalizing a multi-volume conceptual design report. The FCC develops high-energy circular collider options based on a new 100 km tunnel. Long-term goal is a 100 TeV center of mass proton-proton collider (FCC-hh). The study includes a high-luminosity electron-positron collider (FCC-ee) as a possible first step, and it also examines lepton-hadron scenarios (FCC-he). In addition, the FCC study includes the design of the High Energy LHC (HE-LHC), housed in the LHC tunnel, and based on the same high-field magnet technology as the FCC-hh. The FCC study further includes an elaboration of the physics cases, including for heavy-ion collisions, and detector concepts, as well as staging and implementation scenarios. This report summarizes the study achievements with special emphasis on the HE-LHC.