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Proceedings Paper

Slumped glass optics for x-ray telescopes: advances in the hot slumping assisted by pressure
Author(s): B. Salmaso; C. Brizzolari; S. Basso; M. Civitani; M. Ghigo; G. Pareschi; D. Spiga; G. Tagliaferri; G. Vecchi
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Paper Abstract

Slumped Glass Optics is a viable solution to build future X-ray telescopes. In our laboratories we use a direct hot slumping approach assisted by pressure, in which the glass optical surface is in contact with the mould, and a pressure is applied to enforce the replication of the mould shape on the glass optical surface. Several prototypes have been already produced and tested in X-rays, showing a continuous improvement in our technology. In this paper, we present the advances in our technology, in terms of slumped glass foils quality and expected performances upon an ideal integration. By using Eagle XG glass foils and Zerodur K20 for the slumping mould, we have fine tuned several process parameters: we present a critical analysis correlating the changes in the process to the improvements in different spatial frequency ranges encompassing the profile and roughness measurements. The use of a re-polished K20 mould, together with the optimized process parameters, lead to the latest result of glass foils with expected performance of less than 3 arcsec in single reflection at 1 keV X-ray energy. This work presents all the relevant steps forward in the hot slumping technology assisted by pressure, aimed at reaching angular resolutions of 5 arcsec for the whole mirror assembly.

Paper Details

Date Published: 21 September 2015
PDF: 16 pages
Proc. SPIE 9603, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VII, 96030O (21 September 2015); doi: 10.1117/12.2187539
Show Author Affiliations
B. Salmaso, INAF - Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi dell’Insubria (Italy)
C. Brizzolari, INAF - Osservatorio Astronomico di Brera (Italy)
Univ. degli Studi di Milano-Bicocca (Italy)
S. Basso, INAF - Osservatorio Astronomico di Brera (Italy)
M. Civitani, INAF - Osservatorio Astronomico di Brera (Italy)
M. Ghigo, INAF - Osservatorio Astronomico di Brera (Italy)
G. Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
D. Spiga, INAF - Osservatorio Astronomico di Brera (Italy)
G. Tagliaferri, INAF - Osservatorio Astronomico di Brera (Italy)
G. Vecchi, INAF - Osservatorio Astronomico di Brera (Italy)


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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