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

Abstract

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 $\gamma$-rays coming from distant astronomical sources and detected by CTA.

References in corpus (16)

• Design Concepts for the Cherenkov Telescope Array
• Calibration of cameras of the H.E.S.S. detector
• Teraelectronvolt Astronomy
• Design and Operation of FACT -- The First G-APD Cherenkov Telescope
• An LED-based Flasher System for VERITAS
• The Active Mirror Control of the MAGIC Telescope
• The ASTRI SST-2M Prototype: Camera and Electronics
• NectarCAM, a camera for the medium sized telescopes of the Cherenkov Telescope Array
• Bokeh Mirror Alignment for Cherenkov Telescopes
• Performance of the upgraded H.E.S.S. cameras
• FlashCam: A fully digital camera for CTA telescopes
• Procedures for the relative calibration of the SiPM gain on ASTRI SST-2M camera
• Photosensor Characterization for the Cherenkov Telescope Array: Silicon Photomultiplier versus Multi-Anode Photomultiplier Tube
• The Atmospheric Monitoring Strategy for the Cherenkov Telescope Array
• The Camera Calibration Strategy of the Cherenkov Telescope Array
• Contributions of the Cherenkov Telescope Array (CTA) to the 6th International Symposium on High-Energy Gamma-Ray Astronomy (Gamma 2016)

Cited by in corpus (3)

• Measurement of performance of the NectarCAM photodetectors
• The NectarCAM Timing System
• A single photo-electron calibration system for theNectarCAM camera of the Cherenkov Telescope ArrayMedium-Sized Telescopes