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In this work, we describe the optical properties of the single photoelectron(SPE) calibration system designed for NectarCAM, a camera proposed for theMedium Sized Telescopes (MST) of the Cherenkov Telescope Array (CTA). One ofthe goals of the SPE system, as integral part of the NectarCAM camera, consistsin measuring with high accuracy the gain of its photo-detection chain. The SPEsystem is based on a white painted screen where light pulses are injectedthrough a fishtail light guide from a dedicated flasher. The screen - placed 15mm away from the focal plane - is mounted on an XY motorization that allowsmovements over all the camera plane. This allows in-situ measurements of theSPE spectra via a complete scan of the 1855 photo-multiplier tubes (PMTs) ofNectarCAM. This calibration process will enable the reduction of the systematicuncertainties on the energy reconstruction of $\gamma$-rays coming from distantastronomical sources and detected by CTA.

nuclear instruments and methods in physics research section a accelerators spectrometers detectors and associated equipment

Design and characterization of a single photoelectron calibration system  for the NectarCAM camera of the medium-sized telescopes of the Cherenkov  Telescope Array