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The next generation of proton decay and neutrino experiments, thepost-SuperKamiokande detectors as those that will take place in megaton sizewater tanks, will require very large surfaces of photodetection and a largevolume of data. Even with large hemispherical photomultiplier tubes, theexpected number of channels should reach hundreds of thousands. A funded R&Dprogram to implement a solution is presented here. The very large surface ofphotodetection is segmented in macro pixels made of 16 hemispherical (12inches) photomultiplier tubes connected to an autonomous front-end which workson a triggerless data acquisition mode. The expected data transmission rate is5 Mb/s per cable, which can be achieved with existing techniques. Thisarchitecture allows to reduce considerably the cost and facilitate theindustrialization. This document presents the simulations and measurementswhich define the requirements for the photomultipliers and the electronics. Aproto-type of front-end electronics was successfully tested with 16photomultiplier tubes supplied by a single high voltage, validating thebuilt-in gain adjustment and the calibration principle. The first tests andcalculations on the photomultiplier glass led to the study of a new packageoptimized for a 10 bar pressure in order to sustain the high underwaterpressure.

PMm2: large photomultipliers and innovative electronics for the next-generation neutrino experiments