|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.