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ATLAS Experiment CERN

Calorimeter
The calorimeter measures the energies of charged and neutral particles. It consists of metal plates (absorbers) and sensing elements. Interactions in the absorbers transform the incident energy into a "shower" of particles that are detected by the sensing elements. 
In the inner sections of the calorimeter, the sensing element is liquid argon. The showers in the argon liberate electrons that are collected and recorded.
In the outer sections, the sensors are tiles of scintillating plastic. The showers cause the plastic to emit light which is detected and recorded.








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