• Voir en HiLumi LHC: full-scale tests start Scientists at CERN have triggered the complex cooldown of a 95-m-long test stand that reproduces the underground configuration of innovative technologies for the Large Hadron Collider’s high-luminosity upgrade 23 February, 2026 View of the IT String magnet line (Image: CERN) CERN has reached a crucial milestone in the advancement of the High-Luminosity Large Hadron Collider (HiLumi LHC) project with the start of the cryogenic cooldown to 1.9 K (‑271.3 °C) of its 95-metre-long test stand - a full-scale replica of the innovative equipment that will transform the LHC in the coming years. • The test stand is designed to validate the novel magnet system (the inner triplet beam-focusing magnets) and its complex infrastructure, which is a key element in a major upgrade of the LHC that is set to enter operation in 2030. • This summer will mark the start of a four-year-long intensive work period (Long Shutdown 3 - LS3) to transform the LHC into the HiLumi LHC-a groundbreaking accelerator that will usher in a new era for high-energy physics. • The HiLumi LHC will increase by a factor of ten the number of particle collisions (called “luminosity”), vastly increasing the volume of physics data available for researchers. • This leap forward will allow physicists to explore the behaviour of the Higgs boson and other elementary particles with unprecedented precision and to uncover rare new phenomena that might reveal themselves. • “I don’t think it is possible to overstate the importance and excitement of the High-Luminosity LHC, which is the largest project undertaken by CERN for the past 20 years,” explains Mark Thomson, CERN Director-General.

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  • CERN has reached a crucial milestone in the advancement of the High-Luminosity Large Hadron Collider (HiLumi LHC) project with the start of the cryogenic cooldown to 1.9 K (‑271.3 °C) of its 95-metre-long test stand - a full-scale replica of the innovative equipment that will transform the LHC in the coming years. The test stand is designed to validate the novel magnet system (the inner triplet beam-focusing magnets) and its complex infrastructure, which is a key element in a major upgrade of the LHC that is set to enter operation in 2030. This summer will mark the start of a four-year-long in

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