'What CERN Does Next Matters For Science and For International Cooperation'

CERN faces a pivotal decision about its future as the Large Hadron Collider approaches the end of its usefulness by the early 2040s. Management proposes building the Future Circular Collider (FCC), a machine with a 90-kilometer circumference that would smash particles at eight times the energy of the LHC. This hugely consequential plan faces significant challenges. Much of the required technology doesn't exist yet, including superconducting magnets strong enough to bend high-energy particle beams.

The project also lacks the clear rationale that the LHC had in finding the Higgs boson. The proposal has divided physicists. Critics worry about the decades-long timeline, potential cost overruns, and the risk of sacrificing other valuable CERN activities. Germany, which provides 20% of the lab's budget, has already indicated it won't increase contributions. A council-appointed group is now gathering input from the physics community before making recommendations in December.

Nature's editorial board adds: Unless some nations step up with a major infusion of cash, the FCC faces an uncertain prospect of being funded. But waiting too long could mean that there will be a large gap between the new facility opening and the closure of the LHC, and precious expertise could end up being lost.

Although physicists might disagree on what CERN should do, they nearly unanimously care about the lab's future. They and their leaders must now make the case for why European taxpayers, who fund most of the lab's yearly budget should care, too. The stakes are beyond science, and even beyond Europe.

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