PT Journal AU FCC Collaboration (Abada, Aea Aguilera-Verdugo, JJ Hernandez, P Ramirez-Uribe, NS Renteria-Olivo, AE Rodrigo, G Sborlini, GFR Valle, JWF TI HE-LHC: The High-Energy Large Hadron Collider Future Circular Collider Conceptual Design Report Volume 4 SO European Physical Journal-Special Topics JI Eur. Phys. J.-Spec. Top. PY 2019 BP 1109 EP 1382 VL 228 IS 5 DI 10.1140/epjst/e2019-900088-6 LA English AB In response to the 2013 Update of the European Strategy for Particle Physics (EPPSU), the Future Circular Collider (FCC) study was launched as a world-wide international collaboration hosted by CERN. The FCC study covered an energy-frontier hadron collider (FCC-hh), a highest-luminosity high-energy lepton collider (FCC-ee), the corresponding 100 km tunnel infrastructure, as well as the physics opportunities of these two colliders, and a high-energy LHC, based on FCC-hh technology. This document constitutes the third volume of the FCC Conceptual Design Report, devoted to the hadron collider FCC-hh. It summarizes the FCC-hh physics discovery opportunities, presents the FCC-hh accelerator design, performance reach, and staged operation plan, discusses the underlying technologies, the civil engineering and technical infrastructure, and also sketches a possible implementation. Combining ingredients from the Large Hadron Collider (LHC), the high-luminosity LHC upgrade and adding novel technologies and approaches, the FCC-hh design aims at significantly extending the energy frontier to 100 TeV. Its unprecedented centre-of-mass collision energy will make the FCC-hh a unique instrument to explore physics beyond the Standard Model, offering great direct sensitivity to new physics and discoveries. ER