The Large Hadron Collider (LHC) officially ceased operations on June 27, 2026, initiating Long Shutdown 3 (LS3), a multi-year engineering and maintenance program directed by CERN to prepare the facility for its next high-intensity operational phase.
The 47-month shutdown represents the most extensive intervention on the accelerator complex since its original construction, aiming to transition the system into the High-Luminosity LHC (HL-LHC) by 2030.
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The upgrade will intensify the collider's proton-proton collision rate by a factor of 10, jumping from the current 2.4 billion interactions per second to generate vastly larger datasets for subatomic research.
The global scientific community plans to overhaul core infrastructure during the hiatus, focusing heavily on upgrading major independent detectors like ATLAS and CMS to handle up to 200 simultaneous collisions per bunch crossing.
Engineering Challenges and Global Coordination
"The LHC has exceeded every expectation," said Oliver Brüning, CERN Director for Accelerators and Technology.
Management teams are overseeing thousands of technicians and engineers worldwide who will dismantle and rebuild key components, including replacing 1.2 kilometers of magnets within the accelerator ring itself.
"Today we say goodbye to the LHC as we have known it, while preparing to welcome its successor: the HiLumi LHC, which will extend this scientific adventure far into the future," Brüning added.
Project leaders emphasized that the structural changes will demand meticulous logistical coordination across international research institutions to keep the complex upgrade timeline strictly on track.
