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HK: Fachverband Physik der Hadronen und Kerne

HK 60: Instrumentation XVI

HK 60.5: Vortrag

Donnerstag, 31. März 2022, 15:00–15:15, HK-H5

Measurements of the Timing Characteristics of Silicon Photomultipliers
— •Christopher Wenzel — Ruhr-Universität Bochum, Institut für Experimentalphysik I

Silicon Photomultipliers (SiPMs) are solid-state detectors with single-photon sensitivity. Samples of the latest generation combine high gain with low noise and have an improved detection efficiency for blue and near-UV light. Due to short rise times below a few hundred picoseconds SiPMs are well suited for fast timing applications such as Time-of-Flight PET.

Within the UFaCal project, various SiPMs are being tested for possible application in a calorimeter prototype that will provide precise timing information in addition to energy.

To compare the timing performance of different SiPMs, the Single Photon Time Resolution (SPTR) was measured. The intrinsic time resolution of the photodetector can be extracted by deconvolving the measured SPTR value and the different contributions of the measurement setup. A limiting factor of the measurable SPTR is given by the pulse width of the used laser system.

This talk presents a setup for SPTR measurements using a femtosecond laser in combination with an optical trigger. Femtosecond pulses grant the ability to neglect the contribution of the laser pulse width to the measured SPTR value. The timing characteristics of a large selection of commercially available SiPMs will be presented.

Funded by BMBF