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Proceedings Paper

Determination of the single photo-electron spectrum and gain measurement for the Cherenkov Telescope Array camera NectarCAM
Author(s): Sami Caroff; Stephen Fegan; Pierre Jean; Jean-François Olive; Adellain Tsiahina
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Paper Abstract

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 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.

Paper Details

Date Published: 9 September 2019
PDF: 10 pages
Proc. SPIE 11119, Optics for EUV, X-Ray, and Gamma-Ray Astronomy IX, 111191W (9 September 2019);
Show Author Affiliations
Sami Caroff, LPNHE (France)
Stephen Fegan, Lab. Leprince-Tinguet, Ecole Polytechnique (France)
Pierre Jean, Institut de Recherche en Astrophysique et Planétologie (France)
Jean-François Olive, Institut de Recherche en Astrophysique et Planétologie (France)
Adellain Tsiahina, Institut de Recherche en Astrophysique et Planétologie (France)


Published in SPIE Proceedings Vol. 11119:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy IX
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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