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T: Fachverband Teilchenphysik

T 18: Exp. Methods, CTA, others

T 18.1: Vortrag

Montag, 20. März 2023, 16:30–16:45, POT/0081

Characterization of PMTs for the FlashCam project — •Oleg Kalekin for the CTA FlashCam collaboration — Erlangen Centre for Astroparticle Physics, FAU Erlangen-Nürnberg, Nikolaus-Fiebiger-Str. 2, 91058 Erlangen, Germany

High quantum efficiency PMTs of type R12199-100-5 from Hamamatsu have been selected for the cameras of telescopes of the Cherenkov Telescope Array (CTA). The FlashCam group has developed a camera design suitable for installation in Medium-Sized Telescopes of CTA.

Using PMTs delivered in 2017, an advanced FlashCam prototype was produced and installed in the central CT5 telescope of the H.E.S.S. experiment in Namibia in fall 2019. Since then the PMTs are in field operation for more than 2 years already, and provide very stable performance. To control the quality of the PMTs, sub-samples delivered in 2017 and 2021-2022 have been characterized in laboratory for timing parameters, gain, afterpulsing and Quantum Efficiency (QE). The results on spectral shape of QE and homogeneity of QE over photocathode area as well as an evolution of these parameters with time will be presented.