# International Conference on New Photo-Detectors (PD15)

6-9 July 2015
Moscow, Troitsk
Europe/Moscow timezone
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# Pixelated Positron Timing Counter with SiPM-readout Scintillator for MEG II experiment

## Speakers

• Miki NISHIMURA

## Content

We have been developing a positron timing counter for the MEG II experiment which aims to search for $\mu^{+} \rightarrow e^{+} \gamma$ decay with an unprecedented sensitivity. It is expected to have an ultimate time resolution of $\sim$30 ps in the high rate environment of the MEG II experiment. We employed a “pixelated” design with $\sim$500 small counters, each of which is based on a fast plastic scintillator plate readout by multiple SiPMs connected in series. This SiPM readout scheme provides a sharp signal waveform and a maximum light collection and thus, a good time resolution of each counter. Furthermore the overall time resolution can be significantly improved by simultaneous multiple timing measurements with several counters. We performed beam tests with a prototype detector and achieved an excellent overall time resolution of $\sim$35ps. In this talk the design and performance of the pixelated timing counter will be presented

## Author's Institution

The University of Tokyo

## Co-author's Institution

INFN Pavia, Dipartimento di Fisicà dell’Università di Pavia, INFN Genova, Universitá degli Studi di Genova