• CERN chills giant magnet line for the world’s most powerful particle collider upgrade The upcoming Long Shutdown 3 will transform the LHC over four intensive years. • Scientists in Switzerland have begun the cooldown of a 312-foot-long test stand for the HiLumi upgrade of the world’s largest and most powerful particle collider, the LHC, to ensure the upgraded magnet systems work properly. • The European Organization for Nuclear Research (CERN) entered a critical phase in the High-Luminosity Large Hadron Collider (HiLumi LHC or HL-LHC) program, with the launch of the cryogenic cooldown. • The 312-foot (95-meter) above-ground test stand, also known as the Inner Triplet String (IT String), is reportedly a full-scale replica of the upgraded hardware that will eventually be installed deep beneath the French-Swiss border. • It is designed to validate the new magnet system, the inner triplet beam-focusing magnets, and its complex infrastructure, which is a crucial element in LHC’s major upgrade set to enter operation in 2030. • A complex cooldown Chilled to 1.9 Kelvin (-456 degrees Fahrenheit), a temperature colder than outer space, the system will meet the conditions for the superconducting magnets that will guide and tightly focus proton beams inside the upgraded collider.

Article Summaries:

  • CERN has begun the cryogenic cooldown of a 312‑foot (95‑m) test stand-known as the Inner Triplet String (IT String)-to validate the upgraded magnet system for the High‑Luminosity Large Hadron Collider (HL‑LHC). The test, part of the upcoming Long Shutdown 3, will chill the string to 1.9 K, the temperature required for the superconducting niobium‑tin (Nb₃Sn) inner triplet magnets that will focus proton beams more tightly. Successful operation of the IT String will confirm that the new magnets, cryogenics, protection systems and power infrastructure can work together before installation in the LHC tunnel. The HL‑LHC, slated to start in 2030, aims to deliver ten times more collisions than the current collider.

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