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Proceedings Paper

Slumped glass foils as substrate for adjustable x-ray optics
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Paper Abstract

Thin glass modular mirrors are a viable solution to build future X-ray telescopes with high angular resolution and large collecting area. In our laboratories, we shape thin glass foils by hot slumping and we apply pressure to assist the replication of a cylindrical mould figure; this technology is coupled with an integration process able to damp low frequency errors and produces optics in the Wolter I configuration, typical for the X-ray telescopes. From the point of view of the hot slumping process, the efforts were focused in reducing low-, mid- and high- frequency errors of the formed Eagle glass foils. Some of our slumped glass foils were used for the development of active X-ray optics, where piezoelectric actuators are used to correct the slumped glass foil deviations from the ideal shape. In particular, they were used for the Adjustable X-raY optics for astrOnoMy project (AXYOM) developed in Italy, and the X-ray Surveyor mission, as developed at the Smithsonian Astrophysical Observatory / Center for Astrophysics (SAO/CfA) in USA. In this paper we describe the optimisation of the hot slumping process, comparing the results with the requirements of the considered active optics projects. Finally, since the present configuration of the Pennsylvania State University (PSU) coating equipment is limited to 100 x 100 mm2, the slumped glass foils used for the SAO project were cut from 200 x 200 mm2 to 100 x 100 mm2, and a low-frequency change was observed. A characterisation of the profile change upon cutting is presented.

Paper Details

Date Published: 8 September 2016
PDF: 15 pages
Proc. SPIE 9965, Adaptive X-Ray Optics IV, 99650B (8 September 2016); doi: 10.1117/12.2238933
Show Author Affiliations
Bianca Salmaso, INAF - Brera Astronomical Observatory (Italy)
Stefano Basso, INAF - Brera Astronomical Observatory (Italy)
Marta Civitani, INAF - Brera Astronomical Observatory (Italy)
Mauro Ghigo, INAF - Brera Astronomical Observatory (Italy)
Joanna Hołyszko, INAF - Brera Astronomical Observatory (Italy)
Carlo Pelliciari, INAF - Brera Astronomical Observatory (Italy)
Daniele Spiga, INAF - Brera Astronomical Observatory (Italy)
Gabriele Vecchi, INAF - Brera Astronomical Observatory (Italy)
Giovanni Pareschi, INAF - Brera Astronomical Observatory (Italy)

Published in SPIE Proceedings Vol. 9965:
Adaptive X-Ray Optics IV
Stephen L. O'Dell; Ali M. Khounsary, Editor(s)

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