Measuring characteristics of Hamamatsu Multi Pixel Photon Counter for Electromagnetic Calorimeters

The poster presents the results of the characterization of the Hamamatsu Multi-pixel photon counter (MPPC), a type of Silicon Photomultiplier (SiPM), which will be used for the readout of a prototype barrel electromagnetic calorimeter (EMC). The next generation of high-energy particle experiments, such as the proposed Electron Ion Collider (EIC) at Brookhaven National Labs, require high resolution EMCs with $4\pi$ coverage. SiPMs are attractive because of their ability to operate in the presence of strong magnetic fields and high neutron fluxes while retaining a compact size. We analyzed a large batch (280) of these detectors for their gain, relative photon detection efficiency and optical cross talk as a function of bias voltage and temperature. Prototype EIC detectors designed with these SiPM calorimeters will be tested at FermiLab in February 2014.