A high resolution Timing Counter for the MEG II experiment

De Gerone, M.; Bevilacqua, A.; Biasotti, M.; Boca, G.; Cattaneo, P. W.; Gatti, F.; Nishimura, M.; Ootani, W.; Pizzigoni, G.; Rossella, M.; Shibata, N.; Siccardi, F.; Simonetta, M.; Uchiyama, Y.; Yoshida, K.

doi:10.1016/j.nima.2015.11.022

The development of a Timing Counter detector designed for the MEGII upgrade of the MEG experiment, which strives to improve the sensitivity on theÎ¼+âe+Î³ decay of an order of magnitude, is presented. It is based on two sets of counters (sectors) arranged on a semi-cylindrical structure; each sector consists of 256 counters. Each counter consists of tile of fast scintillator with a dual-side read-out based on SiPM arrays in series connection. The high granularity has two advantages: optimized size for achieving high resolution (75 ps) for the single counter, and a signale+crosses several counters, so that resolution improves by averaging multiple time measurements. A prototype has been built and tested both in BTF and PSI facilities in order to prove the multi-hit scheme in MEG-like beam conditions. A 35 ps resolution with eight hits has been obtained with ae+beam at 100 kHz. The first sector will be tested in the MEG II pre-engineering run planned at the end of 2015.

A high resolution Timing Counter for the MEG II experiment

De Gerone, M.;Bevilacqua, A.;Biasotti, M.;Boca, G.;Cattaneo, P. W.;Gatti, F.;Nishimura, M.;Ootani, W.;Pizzigoni, G.;Rossella, M.;Shibata, N.;Siccardi, F.;Simonetta, M.;Uchiyama, Y.;Yoshida, K.

2016-01-01

Abstract

The development of a Timing Counter detector designed for the MEGII upgrade of the MEG experiment, which strives to improve the sensitivity on theÎ¼+âe+Î³ decay of an order of magnitude, is presented. It is based on two sets of counters (sectors) arranged on a semi-cylindrical structure; each sector consists of 256 counters. Each counter consists of tile of fast scintillator with a dual-side read-out based on SiPM arrays in series connection. The high granularity has two advantages: optimized size for achieving high resolution (75 ps) for the single counter, and a signale+crosses several counters, so that resolution improves by averaging multiple time measurements. A prototype has been built and tested both in BTF and PSI facilities in order to prove the multi-hit scheme in MEG-like beam conditions. A 35 ps resolution with eight hits has been obtained with ae+beam at 100 kHz. The first sector will be tested in the MEG II pre-engineering run planned at the end of 2015.