The T2K Near Detector will use approximately 40,000 optical channels housed within a 0.2T magnetic field. A new novel type of photo-sensor will be used inside this environment: Geiger-Mode Multi-Pixel Avalanche Photo-Diodes. Sample photoelectron spectra of a 400 pixel Hamamatsu Multi-Pixel Photon-Counter are presented and device gain, breakdown voltage and pixel capacitance extracted.
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