Development of a new TOT-ASIC circuit for SiPM with a good time resolution*

Detectors with SiPMs and plastic scintillators have been widely used as timing counters. Discrete circuits with a fast amplifier are well applied and are achieved <100 ps time-resolution [1]. Since these circuits require large currents, development of miniaturized circuitry is essentially important for power-saving.

We are developing a new ASIC-based circuit to read out signals from Time-Of-Flight detectors combining a plastic scintillator and SiPM (Hamamatsu S13360-3050PE). This ASIC development is based on established TOF-PET ASIC, which obtains timing and charge information with Time Over Threshold (TOT) method [2]. We tested the circuit's performance with electrons from the accelerator at ELPH Tohoku. This new ASIC circuit is expected to be widely applicable not only to particle and nuclear experiments but also to space and medical applications.

I will present the results of the performance test of the TOF-PET ASIC with a plastic-scintillator paddle and the progress of the new ASIC development.

[1] 10.1109/TNS.2014.2321657, http://dx.doi.org/10.1109/TNS.2014. 2347576, arXiv:1402.1404.

[2] T. Orita et al., Nucl. Inst. and Meth. A 912 (2018) 303.