SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 140: Gamma Astronomy VI

T 140.1: Vortrag

Donnerstag, 23. März 2023, 17:30–17:45, POT/0151

Influence of varying pulse shapes on the response of FlashCam — •Fabian Leuschner for the CTA FlashCam collaboration — IAAT, 72076 Tübingen, Germany

FlashCam is a fully digital camera for Imaging Air Cherenkov Telescopes (IACTs) and is foreseen to be used for the Medium-Sized Telescopes (MSTs) at the southern site of the upcoming CTA Observatory. Since 2019, a fully functional advanced prototype is installed to CT5, the world’s largest IACT that is part of the H.E.S.S. array in Namibia. Accurate reconstruction of the input light intensity in each individual pixel is key for correctly reconstructing air showers and consecutively for observations of very high energetic gamma rays. Extensive measurements with tuneable light-pulses from two pulsed lasers have been used to assess the performance of the reconstruction algorithms. The setup provides dual pulses, each with less than a nanosecond duration. Pulses are emitted either synchronously or with an adjustable time delay of multiples of 0.5 ns between each pulse.

After a short introduction into the FlashCam concept, I will discuss the influence of such pulses with varying length, shape, and intensity on the camera response. The results show that FlashCam is able to reconstruct the intensity of incoming light pulses over the required dynamic range with accuracies on the percent scale and meets the requirements for use in the CTA Observatory.