What is the Future Circular Collider (FCC) project at CERN?

Updated

The Future Circular Collider (FCC) is a proposed next-generation particle collider that CERN presents as a possible successor to the Large Hadron Collider (LHC). It is a planning-stage project, not an existing facility: CERN's homepage describes it as something that "could be Europe's next-generation particle collider," and places it under a "Looking to the future" heading alongside the High-Luminosity LHC upgrade. If you are trying to understand CERN's long-term roadmap, the FCC is the forward-looking option to watch; if you need a machine that exists today, the LHC and its planned HiLumi upgrade are the relevant references.

Where the FCC sits in CERN's plans

CERN's homepage frames its work around unique machines used to explore how the Universe works, and it separates current and near-term work from longer-range proposals:

Project Status on CERN's site Relationship to the FCC
LHC Operating, undergoing upgrade work Current flagship collider
HiLumi LHC "In preparation" Increases luminosity by a factor of ten, enabling precision studies after 2030
Future Circular Collider "Looking to the future" Presented as a possible next-generation collider for Europe

The sequencing matters: the HiLumi LHC is the concrete, funded-in-principle upgrade that extends the LHC's physics programme beyond 2030, while the FCC is the longer-horizon proposal that would follow. The site does not state a construction date, cost, or approval status for the FCC, so treat any specific timeline as unconfirmed unless CERN publishes it.

What the site says — and what it doesn't

The homepage entry for the FCC is deliberately brief. It positions the project as a candidate for Europe's next collider and offers a "Learn more" link for further detail. It does not, on the homepage itself, specify:

  • the collision energy or circumference
  • the particle types or experiment design
  • a decision timeline or budget
  • whether approval has been granted

For a reader deciding how much weight to give the FCC, that absence is itself informative: the project is at the proposal and study stage, and the authoritative details live on the dedicated FCC pages rather than the homepage summary.

How to use this if you're researching CERN's future

  1. Start from the homepage's future-projects section. Look for the "Looking to the future" block, which groups the FCC with CERN's other forward-looking initiatives.
  2. Follow the "Learn more" link on the FCC entry to reach the project's own pages, where design and study details are published.
  3. Cross-check against the HiLumi LHC page to separate near-term upgrades from long-term proposals — the two are often mentioned together but have very different statuses.
  4. Verify status before citing dates or costs. Because the homepage gives no figures, any specific number should be traced to a CERN project page or official document.

A common pitfall is conflating the FCC with the HiLumi LHC: both appear in CERN's future-facing content, but only HiLumi is described as "in preparation," while the FCC remains a candidate concept. Another is assuming the FCC replaces the LHC imminently — the site's framing places it after the current upgrade era, not alongside it.

For background on the machines the FCC would eventually follow, see CERN's pages on the High-Luminosity LHC and on Long Shutdown 3, the current maintenance and upgrade phase centred on transforming the LHC into a high-luminosity machine.