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X-ray mirror prototype based on cold shaping of thin glass foils
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Paper Abstract

The Slumping Glass Optics technology for the fabrication of astronomical X-ray mirrors has been developed in recent years in USA and Europe. The process has been used for making the mirrors of the Nustar, mission. The process starts with very thin glass foils hot formed to copy the profile of replication moulds. At INAF - Osservatorio Astronomico di Brera a process based on cold shaping is being developed, based on an integration method involving the use of interconnecting ribs for making stacks. Each glass foil in the stack is shaped onto a very precise integration mould and the correct shape is frozen by means of glued ribs that act as spacers between one layer and the next one (the first layers being attached to a thick substrate). Therefore, the increasing availability of flexible glass foils with a thickness of a few tens of microns (driven by electronic market for ultra-thin displays) opens new possibilities for the fabrication of X-ray mirrors. This solution appears interesting especially for the fabrication of mirrors for hard X-rays (with energy > 10 keV) based on multilayer coatings, taking advantage from the intrinsic low roughness of the glass foils that should grant a low scattering level. The stress frozen on the glass due to the cold shaping is not negligible, but it is kept into account in the errors of the X-ray optics design. As an exercise, we have considered the requirements and specs of the FORCE hard Xray mission concept (being studied by JAXA) and we have designed the mirror modules assuming the cold slumping as a fabrication method. In the meantime, a prototype (representative of the FORCE mirror modules) is being design and integrated in order to demonstrate the feasibility and the capacity to reach good angular resolution.

Paper Details

Date Published: 29 August 2017
PDF: 11 pages
Proc. SPIE 10399, Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII, 1039911 (29 August 2017); doi: 10.1117/12.2275335
Show Author Affiliations
Stefano Basso, INAF - Osservatorio Astronomico di Brera (Italy)
Marta Civitani, INAF - Osservatorio Astronomico di Brera (Italy)
Mauro Ghigo, INAF - Osservatorio Astronomico di Brera (Italy)
Joanna Hołyszko, INAF - Osservatorio Astronomico di Brera (Italy)
Giovanni Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
Bianca Salmaso, INAF - Osservatorio Astronomico di Brera (Italy)
Gabriele Vecchi, INAF - Osservatorio Astronomico di Brera (Italy)
Vadim Burwitz, Max-Planck-Institut für extraterrestrische Physik (Germany)
Carlo Pelliciari, Max-Planck-Institut für extraterrestrische Physik (Germany)
Gisela D. Hartner, Max-Planck-Institut für extraterrestrische Physik (Germany)
Elias Breunig, Max-Planck-Institut für extraterrestrische Physik (Germany)


Published in SPIE Proceedings Vol. 10399:
Optics for EUV, X-Ray, and Gamma-Ray Astronomy VIII
Stephen L. O'Dell; Giovanni Pareschi, Editor(s)

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