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Proceedings Paper

The glass cold-shaping technology for the mirrors of the Cherenkov Telescope Array
Author(s): Rodolfo Canestrari; Giacomo Bonnoli; Giuseppe Crimi; Mauro Fiorini; Enrico Giro; Nicola La Palombara; Giovanni Pareschi; Luca Perri; Gabriele Rodeghiero; Giorgia Sironi; Luca Stringhetti; Giorgio Toso; Carlo Pelliciari
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Paper 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.

Paper Details

Date Published: 18 July 2014
PDF: 10 pages
Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91512V (18 July 2014); doi: 10.1117/12.2055838
Show Author Affiliations
Rodolfo Canestrari, INAF - Osservatorio Astronomico di Brera (Italy)
Giacomo Bonnoli, INAF - Osservatorio Astronomico di Brera (Italy)
Giuseppe Crimi, INAF - Osservatorio Astronomico di Brera (Italy)
Mauro Fiorini, INAF - IASF Milano (Italy)
Enrico Giro, INAF - Osservatorio Astronomico di Padova (Italy)
Nicola La Palombara, INAF - IASF Milano (Italy)
Giovanni Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
Luca Perri, INAF - Osservatorio Astronomico di Brera (Italy)
Gabriele Rodeghiero, INAF - Osservatorio Astronomico di Padova (Italy)
Giorgia Sironi, INAF - Osservatorio Astronomico di Brera (Italy)
Luca Stringhetti, INAF - IASF Milano (Italy)
Giorgio Toso, INAF - IASF Milano (Italy)
Carlo Pelliciari, INAF - Osservatorio Astronomico di Brera (Italy)


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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