Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Detectors 8 (semiconductors)

T 92.2: Talk

Thursday, March 7, 2024, 16:15–16:30, Geb. 30.23: 2/1

Non-linear Response of Silicon Photomultipliers — •Lukas Brinkmann — University of Hamburg, 22761, Luruper Chaussee 149, Hamburg, Germany

In this talk, a method and novel setup are presented that study the non-linear response of SiPMs under different conditions.

The response function of the SiPM to increasing light intensity was measured. From this response function both the on-set of non-linearity can be determined as well as a correction that expands the dynamic range. An essential part of the correction is that it only depends on the measured SiPM response and does not require a linear light source.

The response function shows no dependence on operating voltage and minor dependence on the temporal distribution of light. For the given Hamamatsu SiPM investigated (S14160-1315PS, pixel pitch 15 µm, number of pixels 7296), the on-set of linearity was found to be at 15% of the total number of pixels fired, highlighting the limited dynamic range. With the correction function deviation from linearity by 5% occurs once the measured charge is equal to approximately 80% of the total number of pixels having fired.

The method and setup can be used to reliably measure the response function of the studied SiPM and increase the dynamic range by a factor of five.

Keywords: Silicon Photomultipliers; Non-linear Response