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http://hdl.handle.net/20.500.12386/23640
Title: | Ion beam figuring technique used as final step in the manufacturing of the optics for the E-ELT | Authors: | GHIGO, Mauro VECCHI, Gabriele BASSO, Stefano Citterio, Oberto CIVITANI, Marta Maria PARESCHI, Giovanni SIRONI, GIORGIA |
Issue Date: | 2015 | Journal: | MEMORIE DELLA SOCIETA ASTRONOMICA ITALIANA | Number: | 86 | First Page: | 412 | Abstract: | The INAF-Astronomical Observatory of Brera (INAF-OAB) is exploring the technical problems related to the ion beam figuring (IBF) of the Zerodur hexagonal mirrors (1.45 m corner to corner) of M1 for the European Extremely Large Telescope (E-ELT). As starting step a scaled down version mirror of the same material having size of 1 m corner to corner has been used to assess the relevant figuring problems. This specific mirror is spherical and has a radius of curvature of 3 m which allows a simple interferometric measurement setup. A mechanical support was designed to minimize its deformations due to gravity. The Ion Beam Figuring Facility used for this study has been recently completed in the Brera Observatory and has a figuring area of 170 cm x 140 cm. Aim of this study is the estimation and optimization of the time requested for the correction of the surface using also strategies to control the well-known thermal problems related to the Zerodur material. In this paper we report the results obtained figuring the 1 m corner-to-corner test segment. | URI: | http://hdl.handle.net/20.500.12386/23640 | URL: | http://sait.oat.ts.astro.it/MSAIt860315/index.html | ISSN: | 0037-8720 | Bibcode ADS: | 2015MmSAI..86..412G | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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2015MmSAI..86..412G.pdf | PDF editoriale | 707.39 kB | Adobe PDF | View/Open |
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