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Characterisation and testing of CHEC-M—A camera prototype for the small-sized telescopes of the Cherenkov telescope array.

Zorn, J. and White, R. and Watson, J.J. and Armstrong, T.P. and Balzer, A. and Barcelo, M. and Berge, D. and Bose, R. and Brown, A.M. and Bryan, M. and Chadwick, P.M. and Clark, P. and Costantini, H. and Cotter, G. and Dangeon, L. and Daniel, M. and De Franco, A. and Deiml, P. and Fasola, G. and Funk, S. and Gebyehu, M. and Gironnet, J. and Graham, J.A. and Greenshaw, T. and Hinton, J.A. and Kraus, M. and Lapington, J.S. and Laporte, P. and Leach, S.A. and Le Blanc, O. and Malouf, A. and Molyneux, P. and Moore, P. and Prokoph, H. and Okumura, A. and Ross, D. and Rowell, G. and Sapozhnikov, L. and Schoorlemmer, H. and Sol, H. and Stephan, M. and Tajima, H. and Tibaldo, L. and Varner, G. and Zink, A. (2018) 'Characterisation and testing of CHEC-M—A camera prototype for the small-sized telescopes of the Cherenkov telescope array.', Nuclear instruments and methods in physics research section A: accelerators, spectrometers, detectors and associated equipment., 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 -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 mm 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 -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.

Item Type:Article
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.1016/j.nima.2018.06.078
Publisher statement:© 2018 This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Date accepted:27 June 2018
Date deposited:04 July 2018
Date of first online publication:04 July 2018
Date first made open access:04 July 2019

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