A new timing detector has been developed to measure â¼50 MeV/c positrons with a time resolution of Ïtâ30ps in the MEG II experiment. The detector are segmented into 512 scintillation counters, each of which consists of 120Ã(40or50)Ã5mm3 size BC-422 and two arrays of six AdvanSiD silicon photomultipliers. The single-counter resolutions are measured to be 70â80 ps. The counter layout is optimized to get the maximum number of hit counters (on average 9 for signal positrons). This multiple-counters measurement leads to a significant improvement in the time resolution down to 30 ps. Using the first one-fourth (128) counters, a pilot run was carried out using the MEG II beam of 7Ã107μ+/s and the basic functionality was tested.
30-ps time resolution with segmented scintillation counter for MEG II
De Gerone, M.;Gatti, F.;Pizzigoni, G.;
2017-01-01
Abstract
A new timing detector has been developed to measure â¼50 MeV/c positrons with a time resolution of Ïtâ30ps in the MEG II experiment. The detector are segmented into 512 scintillation counters, each of which consists of 120Ã(40or50)Ã5mm3 size BC-422 and two arrays of six AdvanSiD silicon photomultipliers. The single-counter resolutions are measured to be 70â80 ps. The counter layout is optimized to get the maximum number of hit counters (on average 9 for signal positrons). This multiple-counters measurement leads to a significant improvement in the time resolution down to 30 ps. Using the first one-fourth (128) counters, a pilot run was carried out using the MEG II beam of 7Ã107μ+/s and the basic functionality was tested.
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