GOAL
Muons can penetrate through the calorimeters and reach the outermost part of ATLAS, known as the muon spectrometer. This spectrometer surrounds the calorimeters and measures the trajectories of muons to determine their direction, their electric charge and their momentum. This happens inside a volume of magnetic field produced by superconducting toroïd magnets. The detection elements (the muon chambers) are made of thousands of metal tubes equiped with a central wire and filled with gas.