A possible long-term strategy for high-energy physics at colliders,
after the exploitation of the Large Hadron Collider (LHC) and its High
Luminosity upgrade, considers a tunnel of about 100 km circumference,
which takes advantage of the present CERN accelerator complex. The
Future Circular Colliders (FCC) concept follows on the successful
experience and outcomes of the LEP-LHC machines. A possible first step of
the project is to fit in the tunnel a high-luminosity e+e- collider aimed at
studying comprehensively the electroweak scale with centre-of-mass
energies ranging from the Z pole up to beyond the tt production threshold. A
100 TeV proton-proton collider is considered as the ultimate goal of the
project and defines the infrastuctures.
Future Circular Collider study groups have been formed in a 5 years
design study hosted by CERN, aiming at a Conceptual Design Report and a
review cost in time for next European Strategy milestone at the
horizon of 2020, when the full statistics of the LHC Run 1 and Run 2
will have been analyzed.
I will review the status of the Design study for both machines, giving
an emphasis on the e+e- collider potential first step