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The Multi Pixel Photon Counter (MPPC) is a novel photon senso r manufactured by Hamamatsu Photonics. It has many advantages compared to other photon s ensors (compact size, low cost, high gain and detection efficiency, insensitivity to magnet ic fields). In the GLD calorimeter group, study of the MPPC properties is extensively ongoing aiming t o utilize it as the photon sensor of a finely segmented calorimeter. As a result of the study, we ha ve confirmed that the current 1600 pixel MPPC has almost satisfactory gain, photon detect ion efficiency and noise rate for our requirements. We have also found that the dynamic range o f the 1600 pixel MPPC can be enhanced thanks to its short recovery time, which is useful f or calorimetric use. As a practical test for use at the GLD calorimeter, we have constructed a prototy pe of a scintillator-strip calorimeter and exposed it to 1-6 GeV positron beams and validated its per formance. As a result of the test, we have observed a satisfactory linearity and energy resolu tion of the scintillator-strip calorimeter with full MPPC readout.

Study and development of multi pixel photon counter for the GLD calorimeter readout