18 July 2014 SST dual-mirror telescope for Cherenkov Telescope Array: an innovative mirror manufacturing process
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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.
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Delphine Dumas, Delphine Dumas, Jean-Michel Huet, Jean-Michel Huet, Jean-Laurent Dournaux, Jean-Laurent Dournaux, Philippe Laporte, Philippe Laporte, Cameron Rulten, Cameron Rulten, Jurgen Schmoll, Jurgen Schmoll, Hélène Sol, Hélène Sol, Frédéric Sayède, Frédéric Sayède, Patrice Micolon, Patrice Micolon, Jean-François Glicenstein, Jean-François Glicenstein, Bernard Peyaud, Bernard Peyaud, } "SST dual-mirror telescope for Cherenkov Telescope Array: an innovative mirror manufacturing process", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512U (18 July 2014); doi: 10.1117/12.2055077; https://doi.org/10.1117/12.2055077
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