What Happened to CERN (European Organization for Nuclear Research)?

CERN, the European Organization for Nuclear Research, remains a global leader in fundamental particle physics, continuously pushing the boundaries of human knowledge and technological innovation. As of July 1, 2026, the organization is in a pivotal transitional phase, marked by the conclusion of a significant operational period and the commencement of an ambitious upgrade project, alongside strategic planning for its long-term future.

The Large Hadron Collider (LHC), CERN's flagship accelerator, successfully completed its third data-taking period (Run 3) on June 29, 2026. This run, which began in March 2026, saw the LHC deliver a record amount of data in 2025 and achieve first-time collisions with oxygen and neon ions. Immediately following Run 3, the LHC entered Long Shutdown 3 (LS3), a comprehensive four-year program of maintenance, consolidation, and upgrades. This extensive intervention, the most significant since the LHC's initial construction, is designed to transform the machine into the High-Luminosity LHC (HL-LHC). The HL-LHC aims to increase the collider's luminosity by a factor of ten, enabling researchers to collect vastly larger datasets and perform precision studies of the Higgs boson, while also enhancing the potential for discovering new phenomena beyond the Standard Model. The HL-LHC is scheduled to begin operations in 2030, with the accelerator complex gradually restarting from mid-2028 onwards.

Leadership at CERN also saw a change at the beginning of 2026, with British physicist Mark Thomson assuming the role of Director-General on January 1, 2026, for a five-year mandate. His tenure begins amidst these major technical upgrades and crucial decisions regarding CERN's future research infrastructure. In May 2026, the CERN Council updated the European Strategy for Particle Physics, endorsing the electron-positron Future Circular Collider (FCC-ee) as the preferred option for the next flagship project to succeed the LHC. The FCC-ee, envisioned as a 91-kilometer underground ring, would serve as a 'Higgs factory' to study the Higgs boson in unprecedented detail and explore other fundamental questions in physics, including dark matter and matter-antimatter asymmetry. The project is estimated to cost around CHF 15.3 billion (approximately $19 billion), with a final decision on its construction expected around 2028 and potential operation by the mid-2040s.

Beyond the major accelerator projects, CERN continues its broader scientific and societal contributions. In March 2026, CERN secured funding for 13 new projects from the European Union's Horizon Europe program, focusing on areas like energy efficiency, sustainable innovation, and medical radionuclides. The organization also expanded its international collaboration, with Chile becoming an Associate Member State in April 2026, and Latvia anticipated to become a full Member State in 2026. A new study published in June 2026 highlighted CERN's significant socio-economic benefits, including fostering innovation, technological advancement, and global partnerships, with startups in its CERN Venture Connect program raising 5.6 million CHF in 2025. These developments underscore CERN's ongoing commitment to scientific discovery, technological progress, and international collaboration, even as it navigates complex technical challenges and significant financial considerations for its next generation of research facilities. The passing of Nobel laureate François Englert, a co-discoverer of the Higgs boson, on June 18, 2026, also marked a moment of reflection for the particle physics community.