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Testing light concentrators prototypes for the Cherenkov Telescope Array
Author(s): François Hénault; Pierre-Olivier Petrucci; Laurent Jocou; Brahim Arezki; Yves Magnard; Bruno Khélifi; Pascal Manigot; Jean-François Olive; Pierre Jean; Michael Punch
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Paper Abstract

With more than 30 Medium-Size Telescopes (MST) located in both North and South hemispheres, the Cherenkov Telescope Array (CTA) shall be the largest cosmic gamma ray detector ever built. Each MST focal plane consists in an array of some 1800 photomultipliers equipped with their own light concentrating optics in order to maximizing the amount of Cherenkov radiation collected by the telescope and to block stray light originating from ground environment. Within the CTA Consortium, the Institut de Planétologie et d’Astrophysique de Grenoble (IPAG) is in charge of designing, subcontracting the realization to industry, and testing the MST light concentrators. Two different optical solutions were pre-selected, respectively based on CPCs (Winston cones) and non-imaging concentrating lenses. Prototypes were manufactured by different industrial companies and tested in our laboratory on a test bench specifically built for the project. After shortly describing both optical designs, this communication is essentially focused at experimental results. Each type of concentrator has been submitted to extensive performance measurements, including radiometric efficiency at different wavelengths, rejection curves, and qualitative shape error test. The final selected concentrator is the CPC, although non-imaging lenses exhibit interesting properties in terms of radiometric performance.

Paper Details

Date Published: 7 September 2017
PDF: 14 pages
Proc. SPIE 10379, Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV, 103790B (7 September 2017); doi: 10.1117/12.2272786
Show Author Affiliations
François Hénault, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble-Alpes, CNRS (France)
Pierre-Olivier Petrucci, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble-Alpes, CNRS (France)
Laurent Jocou, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble-Alpes, CNRS (France)
Brahim Arezki, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble-Alpes, CNRS (France)
Yves Magnard, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble-Alpes, CNRS (France)
Bruno Khélifi, Lab. Leprince-Ringuet, Ecole Polytechnique (France)
Pascal Manigot, Lab. Leprince-Ringuet, Ecole Polytechnique (France)
Jean-François Olive, Institut de Recherche en Astrophysique et Planétologie (France)
Pierre Jean, Institut de Recherche en Astrophysique et Planétologie (France)
Michael Punch, Univ. Paris 7-Diderot (France)


Published in SPIE Proceedings Vol. 10379:
Nonimaging Optics: Efficient Design for Illumination and Solar Concentration XIV
Roland Winston; Sarah R. Kurtz, Editor(s)

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