Physics – Instrumentation and Detectors
Scientific paper
2010-06-21
Nucl.Instrum.Meth.A652:528-531,2011
Physics
Instrumentation and Detectors
Proceedings paper for SORMA 2010 conference
Scientific paper
10.1016/j.nima.2010.08.051
Many characteristics of Silicon Photomultipliers can be tuned with temperature and operation voltage. We present preliminary results of a study of the effect of these two operation parameters on the time resolution of large active area Multi-Pixel Photon Counters (MPPCs) manufactured by Hamamatsu. Measurements at -10 C, 0 C, and 10 C at different bias voltages were performed. The time resolution is best at low temperature and high over-voltage. Most significant improvements can be achieved in cases with low number of fired pixels (<10 pixels). Between the worst and best case among the considered conditions a factor of 5 improvement was observed. In cases with large number of fired pixels (>40 pixels) the effect of temperature and operation voltage becomes smaller. The timing performance still improves with decreasing temperature (~ factor of 2) but it hardly depends on the operation voltage. The study shows, that especially in applications where only few photons are available for detection a careful optimization of temperature and operation voltage are advisable to obtain optimum timing results with the MPPC.
Ahmed Gama
Bühler Paul
Marton Johann
Suzuki Ken
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