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Proceedings Paper

SST dual-mirror telescope for Cherenkov Telescope Array: an innovative mirror manufacturing process
Author(s): Delphine Dumas; Jean-Michel Huet; Jean-Laurent Dournaux; Philippe Laporte; Cameron Rulten; Jurgen Schmoll; Hélène Sol; Frédéric Sayède; Patrice Micolon; Jean-François Glicenstein; Bernard Peyaud
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Paper Abstract

The Observatoire de Paris is constructing a prototype Small-Sized Telescope (SST) for the Cherenkov Telescope Array (CTA), named SST-GATE, based on the dual-mirror Schwarzschild-Couder optical design. Considering the mirrors size and its specific curvature and the optical requirements for the Cherenkov imaging telescope, a non-conventional process has been used for designing and manufacturing the mirrors of the SST-GATE prototype. Based on machining, polishing and coating of aluminium bulk samples, this process has been validated by simulation and tests that will be detailed in this paper after a discussion on the Schwarzschild-Couder optical design which so far has never been used to design ground based telescopes. Even if the SST-GATE is a prototype for small size telescopes of the CTA array, the primary mirror of the telescope is 4 meters diameter, and it has to be segmented. Due to the dual-mirror configuration, the alignment is a complex task that needs a well defined and precise process that will be discussed in this paper.

Paper Details

Date Published: 18 July 2014
PDF: 14 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512U (18 July 2014); doi: 10.1117/12.2055077
Show Author Affiliations
Delphine Dumas, Observatoire de Paris à Meudon, CNRS, Univ. Paris Diderot (France)
Jean-Michel Huet, Observatoire de Paris à Meudon, CNRS, Univ. Paris Diderot (France)
Jean-Laurent Dournaux, Observatoire de Paris à Meudon, CNRS, Univ. Paris Diderot (France)
Philippe Laporte, Observatoire de Paris à Meudon, CNRS, Univ. Paris Diderot (France)
Cameron Rulten, Observatoire de Paris à Meudon, CNRS, Univ. Paris Diderot (France)
Jurgen Schmoll, Durham Univ. (United Kingdom)
Hélène Sol, Observatoire de Paris à Meudon, CNRS, Univ. Paris Diderot (France)
Frédéric Sayède, Observatoire de Paris à Meudon, CNRS, Univ. Paris Diderot (France)
Patrice Micolon, CEA-IRFU (France)
Jean-François Glicenstein, CEA-IRFU (France)
Bernard Peyaud, CEA-IRFU (France)


Published in SPIE Proceedings Vol. 9151:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation
Ramón Navarro; Colin R. Cunningham; Allison A. Barto, Editor(s)

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