The Latest Performance and Refurbishment of the Pixelated Timing Counter (ptc) in the MEG II Experiment

T. Yonemoto,G. Boca, P. W. Cattanneo,G. Dal Maso,M. De Gerone,L. Ferrari Barusso,F. Gatti,W. Ootani, A. Papa,M. Rossella,Y. Uchiyama

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT（2024）

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摘要

We have operated the MEG II pixelated timing counter maintaining its overall timing resolution at high level for precise timing measurement of positrons. Since its construction in 2017, the detector’s pixels have shown degradation with high-rate beam irradiation and components (plastic scintillators, SiPMs) aging over time. In 2024, using new 960 SiPMs, we produced and mounted new 80 pixels onto the detector with estimation of the performance improvement.

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关键词

Silicon photo-multiplier (siPM),Plastic scintillator tile,Positron timing measurement

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