The TRD was built by CERN and LAPP d'Annecy . The shower generally extends into the electromagnetic calorimeter. The electromagnetic calorimeter measures photon and electron energies. It permits a more detailed study of the two last modes described above. The hadronic calorimeter is composed of plastic scintillator planes installed in the iron block that closes the magnetic field.
Hadrons interact in the iron and produce showers that are detected by scintillators.
The muon detector is composed of 5 modules containing each four sensitive wire planes. This system allows to determine the muon trajectories with an intrinsic resolution of 400 micrometers. The muons interact only weakly with matter and go through the whole detector. A neutrino interaction in the target does not produce any signal in V but a signal in T1 and T2.