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ATLAS The Underground Giant The world’s largest particle detector is at work in a 40m-high underground cave that would take up half of Notre Dame cathedral. ATLAS does research in the same area as CMS; in fact, the experiments using them monitor one other. It gets its name (A Toroidal LHC ApparatuS) from the outer doughnut-shaped magnet (torus).
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weight: 7,000 tonnes diameter: 25m Length: 46m