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We have developed a new laser-based time calibration system for the MEG IItiming counter dedicated to timing measurement of positrons. The detectorrequires precise timing alignment between $\sim\,$500 scintillation counters.In this study, we present the calibration system which can directly measure thetime offset of each counter relative to the laser-synchronized pulse. Wethoroughly tested all the optical components and the uncertainty of this methodis estimated to be 24 ps. In 2017, we installed the full system into the MEG IIenvironment and performed a commissioning run. This method shows excellentstability and consistency with another method. The proposed system provides aprecise timing alignment for SiPM-based timing detectors. It also has potentialin areas such as TOF-PET.

A Laser-based Time Calibration System for the MEG II Timing Counter