CERN teams have begun installing the mammoth cooling systems needed for its High-Luminosity Large Hadron Collider (HL-LHC) upgrade. The installation of two 16-meter-long cold boxes marks a critical step in preparing the world’s largest particle accelerator for a new era of discovery, set to begin in 2030.
What does it take to see the universe’s tiniest building blocks? At CERN, the answer involves creating some of the coldest places in the galaxy. The Large Hadron Collider (LHC) is already the world’s largest cryogenic installation, chilling over 23 kilometers of its ring to a frosty 1.9 kelvin (-271 °C) to keep its superconducting magnets working. But to see more, and see clearer, scientists need to push the machine even harder.
That’s where the HL-LHC project comes in. This major upgrade will squeeze particle beams more tightly to create up to ten times more collisions for experiments like ATLAS and CMS. The new, more powerful equipment generates more heat, requiring a serious boost in cooling power, reported CERN. The solution? Install two brand-new, industrial-scale refrigerators on the surface, one at each major experiment site.
Think of your kitchen refrigerator, but one scaled up to the size of a small building and designed to operate within a degree of absolute zero. The heart of these new systems is the colossal cold box, a cylindrical behemoth measuring 16 meters long and 3.5 meters in diameter. These units, manufactured by the German industrial gas giant Linde, undertook an epic journey to get to Geneva, traveling by barge along the Danube, Main, and Rhine rivers before a final road trip to the CERN campus.
“This installation is a key milestone for the HL-LHC’s cryogenic system,” said a CERN project engineer. “These cold boxes are where we begin the intensive process of chilling the helium down to its operational temperature.” The work is part of a carefully choreographed sequence. Last October, six large compression units were put in place. Now, with the cold boxes installed, teams will spend the next year connecting miles of piping and installing sophisticated control systems.
But the cooling doesn’t stop at the surface. The helium, chilled to 4.5 kelvin (-268.6 °C) in these surface boxes, will then travel through newly installed cryogenic lines deep underground. There, in February 2025, two smaller cold boxes will take over, performing the final temperature drop to the operational 1.9 kelvin. This multi-stage process is essential for managing the immense thermal load.
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Why go through all this trouble? The superconducting magnets and radiofrequency cavities at the core of the HL-LHC upgrade simply cannot function without this extreme cold. At these temperatures, helium becomes a superfluid, allowing it to cool the massive machinery with incredible efficiency. By the end of 2026, the entire new cryogenic system will undergo rigorous testing using heaters to simulate the exact thermal conditions of the future accelerator.
For the scientists awaiting data, this engineering marvel is the unsung hero of their research. The successful installation and operation of these giant freezers are what will enable the HL-LHC to peer into cosmic mysteries that have remained just out of reach, making the sub-zero winter at CERN a very hot topic indeed for the future of physics.
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