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Title: Characterisation and testing of CHEC-M—A camera prototype for the small-sized telescopes of the Cherenkov telescope array
Authors: Zorn, J
White, R
Watson, JJ
Armstrong, TP
Balzer, A
Barcelo, M
Berge, D
Bose, R
Brown, AM
Bryan, M
Chadwick, PM
Clark, P
Costantini, H
Cotter, G
Dangeon, L
Daniel, M
De Franco, A
Deiml, P
Fasola, G
Funk, S
Gebyehu, M
Gironnet, J
Graham, JA
Greenshaw, T
Hinton, JA
Kraus, M
Lapington, JS
Laporte, P
Leach, SA
Le Blanc, O
Malouf, A
Molyneux, P
Moore, P
Prokoph, H
Okumura, A
Ross, D
Rowell, G
Sapozhnikov, L
Schoorlemmer, H
Sol, H
Stephan, M
Tajima, H
Tibaldo, L
Varner, G
Zink, A
First Published: 4-Jul-2018
Publisher: Elsevier for North-Holland
Citation: Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2018, 904, pp. 44-63
Abstract: The Compact High Energy Camera (CHEC) is a camera design for the Small-Sized Telescopes (SSTs; 4 m diameter mirror) of the Cherenkov Telescope Array (CTA). The SSTs are focused on very-high-energy γ-ray detection via atmospheric Cherenkov light detection over a very large area. This implies many individual units and hence cost-effective implementation, as well as shower detection at large impact distance, and hence large field of view (FoV), and efficient image capture in the presence of large time gradients in the shower image detected by the camera. CHEC relies on dual-mirror optics to reduce the plate-scale and make use of 6 × 6 mm2 pixels, leading to a low-cost (∼150 k€), compact (0.5 m × 0.5 m), and light (∼45 kg) camera with 2048 pixels providing a camera FoV of ∼9 degrees. The CHEC electronics are based on custom TARGET (TeV array readout with GSa/s sampling and event trigger) application-specific integrated circuits (ASICs) and field programmable gate arrays (FPGAs) sampling incoming signals at a gigasample per second, with flexible camera-level triggering within a single backplane FPGA. CHEC is designed to observe in the γ-ray energy range of 1–300 TeV, and at impact distances up to ∼500 m. To accommodate this and provide full flexibility for later data analysis, full waveforms with 96 samples for all 2048 pixels can be read out at rates up to ∼900 Hz. The first prototype, CHEC-M, based on multi-anode photomultipliers (MAPMs) as photosensors, was commissioned and characterised in the laboratory and during two measurement campaigns on a telescope structure at the Paris Observatory in Meudon. In this paper, the results and conclusions from the laboratory and on-site testing of CHEC-M are presented. They have provided essential input on the system design and on operational and data analysis procedures for a camera of this type. A second full-camera prototype based on Silicon photomultipliers (SiPMs), addressing the drawbacks of CHEC-M identified during the first prototype phase, has already been built and is currently being commissioned and tested in the laboratory.
DOI Link: 10.1016/j.nima.2018.06.078
ISSN: 0168-9002
Embargo on file until: 4-Jul-2019
Version: Post-print
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © Elsevier 2018. After an embargo period this version of the paper will be an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License (, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Description: The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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