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Proceedings Paper

A design study of mirror modules and an assembly based on the slumped glass for an Athena-like optics
Author(s): Stefano Basso; Marta Civitani; Giovanni Pareschi; Enrico Buratti; Josef Eder; Peter Friedrich; Maria Fürmetz
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Paper Abstract

The Athena mission was selected for the second large-class mission, due for launch in 2028, in ESA’s Cosmic Vision program. The current solution for the optics is based on the Silicon Pore Optics (SPO) technology with the goal of 2m2 effective area at 1keV (aperture about 3m diameter) with a focal length of 12m. The SPO advantages are the compactness along the axial direction and the high conductivity of the Silicon. Recent development in the fabrication of mirror shells based on the Slumped Glass Optics (SGO) makes this technology an attractive solution for the mirror modules for Athena or similar telescopes. The SGO advantages are a potential high collecting area with a limited vignetting due to the lower shadowing and the aptitude to curve the glass plates up to small radius of curvature. This study shows an alternative mirror design based on SGO technology, tailored for Athena needs. The main challenges are the optimization of the manufacturing technology with respect to the required accuracy and the thermal control of the large surface in conjunction with the low conductivity of the glass. A concept has been elaborated which considers the specific benefits of the SGO technology and provides an efficient thermal control. The output of the study is a preliminary design substantiated by analyses and technological studies. The study proposes interfaces and predicts performances and budgets. It describes also how such a mirror system could be implemented as a modular assembly for X-ray telescope with a large collecting area.

Paper Details

Date Published: 4 September 2015
PDF: 13 pages
Proc. SPIE 9603, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VII, 96030N (4 September 2015); doi: 10.1117/12.2188509
Show Author Affiliations
Stefano Basso, INAF - Osservatorio Astronomico di Brera (Italy)
Marta Civitani, INAF - Osservatorio Astronomico di Brera (Italy)
Giovanni Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
Enrico Buratti, INAF - Osservatorio Astronomico di Brera (Italy)
Josef Eder, Max-Planck-Institut für extraterrestrische Physik (Germany)
Peter Friedrich, Max-Planck-Institut für extraterrestrische Physik (Germany)
Maria Fürmetz, Max-Planck-Institut für extraterrestrische Physik (Germany)

Published in SPIE Proceedings Vol. 9603:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VII
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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