18 July 2014 The glass cold-shaping technology for the mirrors of the Cherenkov Telescope Array
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Abstract
The next generation of imaging atmospheric Cherenkov telescopes will require the production of thousands of mirror segments; an unprecedented amount of optical surface. To accomplish this, the Italian Istituto Nazionale di AstroFisica (INAF) has recently developed a successful technique. This method, called glass cold-shaping, is mainly intended for the manufacturing of mirrors for optical systems with an angular resolution of a few arcminutes, intended to operate in extreme environments. Its principal mechanical features are very low weight and high rigidity of the resulting segments, and its cost and production time turn out to be very competitive as well. The process is based on the shaping of thin glass foils by means of forced bending at room temperature; a sandwich structure is then assembled for retaining the imposed shape. These mirrors are composted of commercial, off-the-shelf materials. In this contribution we give an overview of the latest results achieved in the manufacturing of the pre-production series of mirrors for the Medium Size and Small Size Telescopes of the Cherenkov Telescope Array observatory.
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Rodolfo Canestrari, Rodolfo Canestrari, Giacomo Bonnoli, Giacomo Bonnoli, Giuseppe Crimi, Giuseppe Crimi, Mauro Fiorini, Mauro Fiorini, Enrico Giro, Enrico Giro, Nicola La Palombara, Nicola La Palombara, Giovanni Pareschi, Giovanni Pareschi, Luca Perri, Luca Perri, Gabriele Rodeghiero, Gabriele Rodeghiero, Giorgia Sironi, Giorgia Sironi, Luca Stringhetti, Luca Stringhetti, Giorgio Toso, Giorgio Toso, Carlo Pelliciari, Carlo Pelliciari, "The glass cold-shaping technology for the mirrors of the Cherenkov Telescope Array", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512V (18 July 2014); doi: 10.1117/12.2055838; https://doi.org/10.1117/12.2055838
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