Author/Authors :
Genolini، نويسنده , , B. and Barrillon، نويسنده , , P. and Blin، نويسنده , , S. and Campagne، نويسنده , , J.-E. and Combettes، نويسنده , , B. and Conforti، نويسنده , , S. and Dehaine، نويسنده , , A.-G. and Duchesneau، نويسنده , , D. and Dulucq، نويسنده , , F. and Dumont-Dayot، نويسنده , , N. and Favier، نويسنده , , J. and Fouché، نويسنده , , F. and Hermel، نويسنده , , R. and de La Taille، نويسنده , , C. and Martin-Chassard، نويسنده , , G. and Nguyen Trung، نويسنده , , T. and Périnet، نويسنده , , C. and Peyré، نويسنده , , J. and Pouthas، نويسنده , , J. and Raux، نويسنده , , L. and Rindel، نويسنده , , E. and Rosier، نويسنده , , P. and Tassan-Viol، نويسنده , , J. and Wei، نويسنده , , W. and Zghiche، نويسنده , , A.، نويسنده ,
Abstract :
The next generation of proton decay and neutrino experiments, the post-Super-Kamiokande detectors as those that will take place in megaton size water tanks, will require very large surfaces of photodetection and a large volume of data. Even with large hemispherical photomultiplier tubes, the expected number of channels should reach hundreds of thousands. A funded R&D program to implement a solution is presented here. The very large surface of photodetection is segmented in macro pixels made of 16 hemispherical (12 in) photomultiplier tubes connected to an autonomous front-end which works on a triggerless data acquisition mode. The expected data transmission rate is 5 Mb/s per cable, which can be achieved with existing techniques. This architecture allows reducing considerably the cost and facilitating the industrialization.
ocument presents the simulations and measurements which define the requirements for the photomultipliers and the electronics. A prototype of front-end electronics was successfully tested with 16 photomultiplier tubes supplied by a single high voltage, validating the built-in gain adjustment and the calibration principle. The first tests and calculations on the photomultiplier glass led to the study of a new package optimized for a 10 bar pressure in order to sustain the high underwater pressure.
