CERN Future Circular Collider

CERN Future Circular Collider
Name	Future Circular Collider
Caption	Conceptual layout of a large circular collider near Geneva
Location	Geneva, France/Switzerland border region
Organization	CERN
Status	Proposed
Cost	Estimated tens of billions of euros
Groundbreaking	Proposed 2030s
Type	Particle accelerator

CERN Future Circular Collider

The Future Circular Collider is a proposed next-generation particle accelerator project developed by the CERN study group to succeed the Large Hadron Collider and expand experimental reach beyond the Standard Model. Advocates frame the project as a strategic follow-up to discoveries such as the Higgs boson observation announced by ATLAS and CMS collaborations, intending to push collision energies, luminosities, and detector sensitivities to probe phenomena hinted at by neutrino oscillation results from Super-Kamiokande and anomalies discussed at Neutrino 2020 sessions. The initiative engages institutions like the European Union, national laboratories including Fermilab, DESY, KEK, and bodies such as the International Committee for Future Accelerators.

Overview

The design study outlines a large circular tunnel encircling the Geneva region, conceptually paralleling scale discussions from projects like the Superconducting Super Collider and the Very Large Hadron Collider proposals. The FCC concept includes multiple collider options comparable to plans from ILC and complements agendas set by High-Luminosity LHC upgrades at CERN, linking to technology roadmaps developed with ITER materials studies and cryogenics expertise from European XFEL. Community reports by panels such as the European Strategy for Particle Physics and input from agencies like the U.S. Department of Energy and National Science Foundation inform prioritization, alongside advisory contributions from the Institute of Physics and networks including G7 and G20 science working groups.

Design and Technology

Technical proposals center on a 80–100 km tunnel accommodating accelerator rings for electron–positron (FCC-ee), proton–proton (FCC-hh), and electron–proton options, drawing on superconducting magnet developments similar to those at LHC and R&D programs at CERN laboratories. Key enabling technologies include high-field niobium-tin superconducting magnets, cryogenic systems inspired by LHC cryogenics, and radio-frequency cavities akin to those used at LEP and SLAC. Detector concepts leverage lessons from ATLAS, CMS, LHCb, and ALICE with upgrades in silicon tracker technology pioneered by groups at Rutherford Appleton Laboratory and Lawrence Berkeley National Laboratory. Engineering plans reference tunneling precedents set by the Channel Tunnel and geological studies from the Alpine region, coordinating with civil authorities in Geneva Canton and national agencies such as Swiss Federal Office of Energy.

Physics Goals and Research Program

Primary goals include precision studies of the Higgs boson couplings and self-coupling to discriminate between Supersymmetry scenarios and alternative mechanisms like composite Higgs models examined at conferences such as ICHEP and EPS-HEP. The hadron collider phase aims to extend mass reach for searches for dark matter mediators, extra dimensions frameworks proposed by ADD model and Randall–Sundrum model, and heavy resonances analogous to those predicted in GUT extensions. Flavor physics and CP violation programs build on anomalies reported by LHCb and precision electroweak fits originating from inputs such as LEP and SLC. Neutrino-related measurements and synergy with projects like DUNE and Hyper-Kamiokande broaden the program, while connections to cosmology and Big Bang nucleosynthesis probes link collider outputs to data from the Planck mission and Dark Energy Survey.

Project Timeline and Cost Estimates

Study documents from CERN and community panels sketch staged implementation: preparatory R&D in the 2020s, tunnel construction in the 2030s, FCC-ee operation mid-century followed by an FCC-hh upgrade. Estimated costs, discussed in white papers circulated among stakeholders including the European Commission, range into multiple tens of billions of euro, comparable in scale to earlier mega-science facilities like ITER and requiring multi-decadal financing strategies involving national funding agencies such as CNRS, INFN, STFC, and DOE. Timeline contingencies reference precedent projects including the extended schedules of the International Space Station and delays experienced by Large Hadron Collider commissioning, and incorporate governance reviews by the Scientific Advisory Committee and international roadmaps coordinated through entities like the OECD.

Environmental, Safety, and Societal Impact

Environmental assessments consider tunnel excavation impacts informed by studies for the Gotthard Base Tunnel and groundwater management practices employed in Swiss infrastructure projects overseen by the Federal Office for the Environment (Switzerland). Radiation safety protocols build on frameworks from CERN Radiation Protection policies and lessons from radiological monitoring at facilities such as Brookhaven National Laboratory. Societal debates engage stakeholders from European Parliament committees, local municipalities in Canton of Geneva and neighboring French departments, and civil society groups that previously participated in consultations for infrastructure works like the High-Speed 2 rail project. Outreach and education plans draw upon public engagement models used by Science Museum (London) and Smithsonian Institution exhibits, while workforce development links to university programs at University of Geneva, ETH Zurich, Université Paris-Saclay, and University of Oxford.

International Collaboration and Governance

Governance models propose a consortium approach echoing frameworks of CERN itself, with participation from national research agencies including DFG, ANR, NSERC, and bilateral partnerships with institutes like KEK and Fermilab. Negotiations involve multilateral funding discussions analogous to those for CERN–EU cooperation and procurement agreements similar to international consortia for Square Kilometre Array components. The organizational structure would feature technical boards and scientific advisory panels comparable to those of the Large Hadron Collider experiments, coordinating intellectual property, procurement, and data policies in line with precedents set by the W3C and multinational research infrastructures cataloged by the European Strategy Forum on Research Infrastructures.

Category:Particle accelerators Category:Physics projects