Determination of the single photo-electron spectrum and gain measurement for the Cherenkov Telescope Array camera NectarCAM

0552566 - FZÚ 2022 RIV US eng C - Conference Paper (international conference)
Caroff, S. … Total 5 authors
Determination of the single photo-electron spectrum and gain measurement for the Cherenkov Telescope Array camera NectarCAM.
Proceedings of SPIE. Vol. 11119. Bellingham: SPIE, 2019 - (O'Dell, S.; Pareschi, G.), s. 1-10, č. článku 111191W. ISBN 9781510629318. ISSN 0277-786X. E-ISSN 1996-756X.
[SPIE Optical Engineering + Applications, Optics for EUV, X-Ray, and Gamma-Ray Astronomy /9./. San Diego, California (US), 13.08.2019-15.08.2019]
Research Infrastructure: CTA-CZ - 90046
Keywords : Cherenkov Telescope Array * photons
OECD category: Particles and field physics
https://doi.org/10.1117/12.2530996

The measurement of the photomultiplier gain is a crucial step for Imaging Atmospheric Cherenkov Telescopes in order to translate the measured charge to a number of photons. For that, one of the possibility is to perform measurements with a flashing light source at a low intensity level, in order to reconstruct the charge distribution of a single photon. In this contribution, we will present a method to reconstruct the single photo electron spectrum using low intensity charge distribution. We will show that the usually adopted Gaussian assumption [1] does not reproduce well this data, and will present a new model which explains the data behavior. The impact of this measurement on the gain determination will be presented, and the associated uncertainty will be discussed.
Permanent Link: http://hdl.handle.net/11104/0327678