CERN's Large Hadron Collider Completes Third Run, Enters Long Shutdown for High-Luminosity Upgrade

The Large Hadron Collider (LHC) at CERN has successfully completed its third operational run, with proton beams circulating for the final time on June 27, 2026. The world's highest-energy particle accelerator now enters its third Long Shutdown (LS3), an ambitious program of upgrades that will transform it into the High-Luminosity LHC (HL-LHC). The LHC surpassed expectations during Run 3, delivering nearly double its original integrated luminosity target.

Context

The Large Hadron Collider, operational since 2008, has been instrumental in confirming key theories in physics, including the discovery of the Higgs boson in 2012. Each operational run allows scientists to collect data that can lead to new insights about the universe. The current transition to the High-Luminosity LHC is expected to increase the collision rate, enabling more precise measurements.

Why it matters

The completion of the LHC's third run marks a significant milestone in particle physics research. The upgrades planned during the Long Shutdown aim to enhance the collider's capabilities, which could lead to groundbreaking discoveries. As the world's highest-energy particle accelerator, the LHC plays a crucial role in advancing our understanding of fundamental particles and forces.

Implications

The enhancements to the LHC could significantly impact the field of particle physics, potentially leading to new discoveries that challenge existing theories. Researchers and institutions worldwide may benefit from increased access to data generated by the upgraded collider. The scientific community will closely watch how these developments influence ongoing and future experiments.

What to watch

During the Long Shutdown, scheduled upgrades will be implemented, which could take several years to complete. As work progresses, scientists will prepare for the next operational phase, focusing on new experiments and research goals. Observers will be keen to monitor the timeline for the completion of these upgrades and any advancements in related technologies.