Study of avalanche microchannel photodiodes for use in a scintillating fiber muon beam profile monitor

We report a study on the use of avalanche microchannel photodiodes (AMPDs) with sensitive area 0.75×0.75mm2, density of microchannels 104/mm2104/mm2, and maximum gain of 3×1043×104, in a scintillating fiber muon beam detector. We show that an AMPD-based detector is efficient for 29 MeV/cc muons at count rates up to several MHz and is operational in magnetic fields up to a few Tesla.