Development of the next generatiof PPD camera for the ground based gamma-ray telescope

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We studied the basic characteristics of MPPC(3mm×3mm size,50μm pitch), and found that the temperature characteristics of the gain is-3.1×10^4/℃, noise rate depends on both overvoltage and temperature, cross talk probability as a function of overvoltage is expressed by a combination of exponential function and linear function, and the sum probability of cross talk and after pulse don't depend on the temperature. Then we built prototype camera for an atmospheric Cherenkov telescope, which consist of 4 discrete arrays of 4ch by 4ch MPPCs (3mm×3mm size, 50μm pitch). We didn't succeed to detect atmospheric Cherenkov image mainly due to higher trigger rate compared to pulse width of MPPC signals.