Abstract
We developed a timing counter with a monolithic array of multi-pixel photon counters (MPPCs) coupled to a <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$10 \times 12.6 \times 24~\hbox{mm}^3$</tex></formula> plastic scintillator. A signal of the MPPC was processed and its fast components were amplified by a developed readout circuit to improve the timing. The performances of the counter were evaluated by electrons with energies of 855 MeV. A set of the MPPC based scintillation counter and a PMT based reference counter achieved the TOF resolution less than 80 ps ( <formula formulatype="inline" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex Notation="TeX">$\sigma $</tex></formula> ). The gain was almost constant up to the count rate of 170 kHz.
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