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Slumped glass foils as substrate for adjustable x-ray optics

Date Issued
2016
Author(s)
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Hołyszko, Joanna
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Pelliciari, Carlo
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DOI
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.
Coverage
Adaptive X-Ray Optics IV
All editors
O'Dell, Stephen L.; Khounsary, Ali M.
Series
Volume
9965
Start page
99650B
Conferenece
Adaptive X-ray Optics IV
Conferenece place
San Diego, CA, USA
Conferenece date
28-29 August, 2016
Uri
Url
Issn Identifier
0277-786X
Ads BibCode
2016SPIE.9965E..0BS
Rights
open.access
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