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M. Benedikt, A. Ballarino, T. Baumgartner, J. Bernardi, A. Doblhammer, M. Eisterer, M. Hofer, S. Holleis, J. Keintzel, A. Moros, M. Ortino, S. Pfeiffer, E. Renner, M. Stöger-Pollach, J. Gutleber, C. Senatore, A. Saba, V. Völkl, C. Köberl, H. Kritscher, T. Hoehn, M. Aburaia, A. Kollegger, M. Lackner, P. Keinz, M. Putti, H. Humer et al.:
"HE-LHC: The High-Energy Large Hadron Collider Future Circular Collider Conceptual Design Report Volume 4";
European Physical Journal - Special Topics, 228 (2019), 1109 - 1382.

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 100km 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 fourth volume
of the FCC Conceptual Design Report, devoted to the High-Energy
Large Hadron Collider HE-LHC. It summarizes the HE-LHC physics
discovery opportunities, presents the HE-LHC accelerator design, performance
reach, and 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 HE-LHC design aims at
a hadron collider with about twice the centre-of-mass collision energy
that the LHC can reach. Its performance aims at exploring physics
beyond the Standard Model, signi cantly extending the LHC's direct
and indirect sensitivity to new physics and discoveries.

http://dx.doi.org/10.1140/epjst/e2019-900088-6