Abstract
Timing resolution of the Multi-Pixel Photon Counter (MPPC) has been investigated over several years. In our previous work, differences in coincidence resolving time (CRT) depending on MPPC performance were not observed [1], probably due to other limitation such as the measurement conditions. Recently a low crosstalk (LCT) MPPC series with trenches has been developed such as the S13082-050CS, which makes it possible to apply high overvoltage and maintain good performance. In this work, CRT dependence on MPPC performance was investigated with new measurement conditions. Our results indicate that photon detection efficiency (PDE) significantly affects the absolute CRT value, while dark and crosstalk pulses only limit the operating voltage range. 100 µm LCT4 and 50 µm high fill factor (HFF) MPPCs which have high PDE showed good CRT, however energy resolution at high overvoltage was not good. 3×3 mm2 50 µm LCT5 and 75 µm LCT4 MPPCs coupled to 3×3×20 mm3 LFS (Lutetium Fine Silicate) scintillator achieved 195 ps and 180 ps CRT respectively at 5 V overvoltage.
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