Measurement of silicon photomultipliers at different operating points and simulation with GEANT4

A temperature regulation and stabilization system for silicon photomultipliers is de- signed, tested and integrated into an optical test stand. A set of operating parameters of different silicon photomultipliers at various temperatures is obtained by measure- ment. These parameters are the pulse shape of the signal, the thermal noise rate, the crosstalk probability and the after pulsing probability. For detector simulations a dedicated silicon photomultiplier simulation model in GEANT4 is extended and adapted. This model is then fed with the previously obtained parameters. Subse- quently, the functionality of the model is validated by means of performing the same analysis on the simulation output as before on the measured data. The model proves itself to be capable of simulating all basic features of a silicon photomultiplier.