On 29 June 2026 the Large Hadron Collider Is Being Switched Off 💡
Why It Matters
The HL‑LHC’s tenfold increase in data will accelerate fundamental discoveries and cement CERN’s position as the world’s premier particle‑physics laboratory.
Key Takeaways
- •LHC shutdown begins June 29, 2026 for four-year upgrade
- •1.2 km of ring replaced with high‑luminosity magnets
- •New HL‑LHC will be ten times brighter, delivering tenfold data
- •Test facility achieved 1.9 K superconducting operation milestone, significant
- •Updated design and installation procedures validated before tunnel work
Summary
On June 29, 2026 CERN will power down the Large Hadron Collider for a four‑year shutdown to install the High‑Luminosity LHC (HL‑LHC). The plan replaces roughly 1.2 km of the 27‑km ring with new superconducting magnets, marking the most extensive upgrade in two decades.
The HL‑LHC is designed to be ten times brighter than the current machine, delivering tenfold more collision data. By squeezing proton bunches into smaller volumes, the new high‑field magnets increase collision rates dramatically, opening unprecedented opportunities to probe rare processes.
A test facility has already demonstrated the technology, operating a superconducting liquid‑helium system at 1.9 K—a critical milestone. Engineers report that design tweaks derived from these tests have been incorporated, and the installation procedure has been rehearsed successfully.
When the upgrade is complete, CERN will enable experiments that could reshape particle‑physics, attract renewed funding, and maintain Europe’s leadership in fundamental research. The enhanced data volume will also accelerate discoveries in dark matter, Higgs boson properties, and beyond‑Standard‑Model physics.
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