High-Energy Frontier Circular Colliders

Starting from the LHC experience in 2010-12, I review the plan for the next ten years, followed by a presentation of the HL-LHC project. Next, the combination of LHeC (ep) and SAPPHiRE (gamma-gamma) is discussed as a pair of intermediate Higgs factories, which could be run in parallel to the HL-LHC, and which would provide the RF system and injector complex for a later e+e- Higgs factory. Possible future higher-energy hadron colliders include HE-LHC and VHE-LHC. The 80-100 km tunnel built for the latter could also host a circular e+e- Higgs factory, TLEP, offering extremely high resolution for many of the Higgs coupling parameters, with sensitivity to new physics at multi-TeV scales. Finally I propose a coherent long-term strategy based on a sequence of circular high-energy colliders. Invited presentation at 2013 Annual CHIPP Meeting, Sursee, Switzerland, 25 June 2013.