aTLAS detector Muon Detecto s Electromagnetic Calorimeters 回 Solenoid Forward Calor meters Barrel Toroid Had onic Calorimeters OLong: 44 meters, 12.5 meters in radius, -7000 tons (One Eiffel tower, 100 jet 747) u components built within 35 countries Muon Spectrometer, Hadronic Calorimeter Electromagnetic(EM) Calorimeter, Inner Detector, 2/2/2021ATLAS detector 4 2/2/2021 ❑Long: 44 meters，12.5 meters in radius, ~7000 tons. (One Eiffel tower ,~100 jet 747). ❑ components built within 35 countries : Muon Spectrometer, Hadronic Calorimeter, Electromagnetic (EM) Calorimeter ，Inner Detector