Scintillator/WLS fiber readout with PSiPs

We report on the use of two varieties of Pixelated Silicon Photosensors (PSiPs) as the readout for two scintillator/wavelength shifting fiber configurations. One configuration, a rectangular cross-section scintillator bar similar to that used in the MINOS experiment, is under consideration for the muon system of an International Linear Collider detector; the second, a triangular cross-section scintillator bar developed for the MINERvA experiment, is planned for use in the T2K experiment pi-zero detector subsystem. The PSiPs tested were the 400 pixel Multi-Pixel Photon Counter (MPPC) from Hamamatsu Photonics K.K. (HPK) and the 556 pixel Metal-Resistor-Semiconductor (MRS) from the Center of Perspective Technologies and Apparatus (CPTA). Data were collected in a 120 GeV test beam at Fermi National Accelerator Laboratory. We report also on a new high density photosensor from aPeak inc. able to read out sixty four close-packed 1.2 mm diameters fibers on a single chip.