TY - JOUR
T1 - Design and characterization of a single photoelectron calibration system for the NectarCAM camera of the medium-sized telescopes of the Cherenkov Telescope Array
AU - Biasuzzi, Barbara
AU - Pressard, Kevin
AU - Biteau, Jonathan
AU - Geoffroy, Brice
AU - Goncalves, Carlos Domingues
AU - Hull, Giulia
AU - Imre, Miktat
AU - Josselin, Michaël
AU - Maroni, Alain
AU - Mathon, Bernard
AU - Seminor, Lucien
AU - Suomijarvi, Tiina
AU - Trung, Thi Nguyen
AU - Vatrinet, Laurent
AU - Brun, Patrick
AU - Caroff, Sami
AU - Fegan, Stephen
AU - Ferreira, Oscar
AU - Jean, Pierre
AU - Karkar, Sonia
AU - Olive, Jean François
AU - Rivoire, Stéphane
AU - Sizun, Patrick
AU - Thiant, Floris
AU - Tsiahina, Adellain
AU - Toussenel, François
AU - Vasileiadis, Georges
N1 - Publisher Copyright:
© 2019 Elsevier B.V.
PY - 2020/1/11
Y1 - 2020/1/11
N2 - In this work, we describe the optical properties of the single photoelectron (SPE) calibration system designed for NectarCAM, a camera proposed for the Medium Sized Telescopes (MST) of the Cherenkov Telescope Array (CTA). One of the goals of the SPE system, as integral part of the NectarCAM camera, consists in measuring with high accuracy the gain of its photo-detection chain. The SPE system is based on a white painted screen where light pulses are injected through a fishtail light guide from a dedicated flasher. The screen – placed 15 mm away from the focal plane – is mounted on an XY motorization that allows movements over all the camera plane. This allows in-situ measurements of the SPE spectra via a complete scan of the 1855 photo-multiplier tubes (PMTs) of NectarCAM. This calibration process will enable the reduction of the systematic uncertainties on the energy reconstruction of γ-rays coming from distant astronomical sources and detected by CTA. We discuss the design of the screen used in the calibration system and we present its optical performances in terms of light homogeneity and timing of the signal.
AB - In this work, we describe the optical properties of the single photoelectron (SPE) calibration system designed for NectarCAM, a camera proposed for the Medium Sized Telescopes (MST) of the Cherenkov Telescope Array (CTA). One of the goals of the SPE system, as integral part of the NectarCAM camera, consists in measuring with high accuracy the gain of its photo-detection chain. The SPE system is based on a white painted screen where light pulses are injected through a fishtail light guide from a dedicated flasher. The screen – placed 15 mm away from the focal plane – is mounted on an XY motorization that allows movements over all the camera plane. This allows in-situ measurements of the SPE spectra via a complete scan of the 1855 photo-multiplier tubes (PMTs) of NectarCAM. This calibration process will enable the reduction of the systematic uncertainties on the energy reconstruction of γ-rays coming from distant astronomical sources and detected by CTA. We discuss the design of the screen used in the calibration system and we present its optical performances in terms of light homogeneity and timing of the signal.
KW - CTA
KW - Medium sized telescope
KW - NectarCAM
U2 - 10.1016/j.nima.2019.162949
DO - 10.1016/j.nima.2019.162949
M3 - Article
AN - SCOPUS:85073514061
SN - 0168-9002
VL - 950
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
M1 - 162949
ER -