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flag CERN finished the first HGCAL prototype, a high-precision silicon detector for the LHC’s 2030 upgrade, to study rare particle collisions.

flag Scientists at CERN have completed the first prototype cassette for the High-Granularity Calorimeter (HGCAL), a major upgrade for the CMS experiment ahead of the High-Luminosity LHC’s 2030 startup. flag The wedge-shaped component, built in France, is part of the largest silicon-based detector ever planned, designed to handle up to 40 million collisions per second with 140–200 occurring simultaneously. flag Featuring over 3 million channels across 47 layers, the HGCAL will provide unprecedented 5D detection—spatial position, energy, and timing precision down to trillionths of a second—improving particle identification and triggering. flag The electromagnetic section uses silicon modules from six global centers, while Fermilab builds the hadronic section. flag The detector will withstand intense radiation and enable more precise study of rare particle processes.

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