n_TOF third generation spallation target

Assembly phase of the third generation n_TOF neutron spallation target. Insertion of the pure lead core and its aluminum alloy frame in the stainless steel pressurized vessel and related aluminum alloy moderators. The step is very delicate as it involves precise movement of a 1.5 ton mass with tight tolerances. The Pb cradle is required in order to keep the Pb blocks in place when impacted by the proton beam and to act as a distribution manifold for the nitrogen cooling loop.