July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

FACT – Influence of SiPM Crosstalk on the Performance of an Operating Cherenkov Telescope

Jul 30, 2015, 3:30 PM
Mississippi Foyer (World Forum)

Mississippi Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 68
Poster contribution GA-EX Poster 1 GA


Mr Jens Buß (TU Dortmund)


The First G-APD Cherenkov telescope (FACT) is the first operational telescope of its kind with a camera equipped with silicon photon detectors (G-APD aka. SiPM). SiPMs have a high photon detection efficiency (PDE), while being more robust to bright light conditions than the commonly used photo-multiplier tubes. This technology has allowed us to increase the duty cycle beyond that of the current generation of imaging air Cherenkov telescopes. During the last four years, the operation of FACT has proven that SiPMs are a suitable photon detectors for an application in the field of earth-bound gamma-ray astronomy. Nevertheless, it has been argued that crosstalk, after-pulses and dark counts are the main drawback of SiPMs, as these effects produce photon-like signals that would add up the signal background. Consequently, it is necessary to understand their impact on the analysis of data from FACT. In this presentation, we will show results of a study about the influence of different settings of crosstalk and dark counts on the performance of FACT i.e. its energy resolution and energy threshold. For that purpose, we used Monte Carlo simulations and compared them to actual data from the SiPM camera of FACT.
Collaboration FACT
Registration number following "ICRC2015-I/" 910

Primary author

Mr Jens Buß (TU Dortmund)


Fabian Temme (TU Dortmund)

Presentation materials

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