Results of the R&D program on a magnetized SCIFI calorimeter

A comprehensive R&D program has been developed on a magnetized scintillating fiber imaging calorimeter to be used for hadronic and electromagnetic energy measurements on neutrino events in a LBL ν beam. In this paper we report on the optimization of the optical readout, in particular on gain, linearity, time resolution and cathode uniformity measurements on several PMT types with standard, fine mesh or channel multiplier structure. The PMT response in the presence of the magnetized calorimeter fringe fields has also been studied.