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Proceedings Paper

Development of cold-slumping glass mirrors for imaging Cherenkov telescopes
Author(s): D. Vernani; R. Banham; O. Citterio; F. Sanvito; G. Valsecchi; G. Pareschi; M. Ghigo; E. Giro; M. Doro; M. Mariotti
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Paper Abstract

The development of lightweight glass mirrors manufactured via cold-slumping technique for Imaging Atmospheric Cherenkov Telescope is presented. The mirror elements have a sandwich-like structure where the reflecting and backing facets are composed by glass sheets with an interposed honeycomb aluminum core. The reflecting coating is deposited in high vacuum by means of physical vapor deposition and consists of aluminum with an additional protective layer of SiO2. The mirror fabrication and environmental qualification by accelerated ageing, thermal cycling and coating adhesion are presented together with the optical performances measured as angular resolution and reflectivity obtained on spherical, 1 squared meter mirror prototypes.

Paper Details

Date Published: 25 July 2008
PDF: 11 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180V (25 July 2008); doi: 10.1117/12.790631
Show Author Affiliations
D. Vernani, Media Lario Technologies (Italy)
R. Banham, Media Lario Technologies (Italy)
O. Citterio, Media Lario Technologies (Italy)
F. Sanvito, Media Lario Technologies (Italy)
G. Valsecchi, Media Lario Technologies (Italy)
G. Pareschi, INAF-Osservatorio Astronomico di Brera (Italy)
M. Ghigo, INAF-Osservatorio Astronomico di Brera (Italy)
E. Giro, INAF-Osservatorio Astronomico di Padova (Italy)
M. Doro, Univ. and INFN Padova (Italy)
M. Mariotti, Univ. and INFN Padova (Italy)

Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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