Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 28: Silicon Detectors IV (SiPMs, HG timing)

T 28.6: Vortrag

Dienstag, 1. April 2025, 17:30–17:45, VG 1.101

Correction of Non-Linear Response of Silicon Photomultipliers — •Lukas Brinkmann, Massimiliano Antonello, Erika Garutti, and Jörn Schwandt — Universität Hamburg, Hamburg, Germany

The finite number of pixels in a silicon photomultiplier (SiPM) limits its dynamic range. The SiPM response deviates from linear by more than 5% already for signals comparable to 50-60% of the total number of pixels. Correcting the non-linear response is essential to extend the SiPMs dynamic range. One challenge in determining the non-linear response correction is providing a reference linear light source. Instead, the single-step method used to calibrate PMTs is applied, based on the difference in responses to two light sources. With this method, the response of various SiPMs with different pixel geometries was measured and corrected. The study shows that the response function does not depend on the operation voltage in the range 2−4 V overvoltage and it is only mildly dependent on temperature over a range of 40 K. Linearity within 1% can be restored by applying a single correction function in a range of ±5 K and ±2 V around the original conditions of the measurement.

Keywords: Silicon Photomultiplier; Non Linear Response