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Proceedings Paper

Prototyping iridium coated mirrors for x-ray astronomy
Author(s): Thorsten Döhring; Anne-Catherine Probst; Manfred Stollenwerk; Florian Emmerich; Veronika Stehlíková; Adolf Inneman
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Paper Abstract

X-ray astronomy uses space-based telescopes to overcome the disturbing absorption of the Earth´s atmosphere. The telescope mirrors are operating at grazing incidence angles and are coated with thin metal films of high-Z materials to get sufficient reflectivity for the high-energy radiation to be observed. In addition the optical payload needs to be light-weighted for launcher mass constrains. Within the project JEUMICO, an acronym for “Joint European Mirror Competence”, the Aschaffenburg University of Applied Sciences and the Czech Technical University in Prague started a collaboration to develop mirrors for X-ray telescopes. The X-ray telescopes currently developed within this Bavarian- Czech project are of Lobster eye type optical design. Corresponding mirror segments use substrates of flat silicon wafers which are coated with thin iridium films, as this material is promising high reflectivity in the X-ray range of interest. The deposition of the iridium films is based on a magnetron sputtering process. Sputtering with different parameters, especially by variation of the argon gas pressure, leads to iridium films with different properties. In addition to investigations of the uncoated mirror substrates the achieved surface roughness has been studied. Occasional delamination of the iridium films due to high stress levels is prevented by chromium sublayers. Thereby the sputtering parameters are optimized in the context of the expected reflectivity of the coated X-ray mirrors. In near future measurements of the assembled mirror modules optical performances are planned at an X-ray test facility.

Paper Details

Date Published: 31 May 2017
PDF: 8 pages
Proc. SPIE 10235, EUV and X-ray Optics: Synergy between Laboratory and Space V, 1023504 (31 May 2017); doi: 10.1117/12.2265931
Show Author Affiliations
Thorsten Döhring, Hochschule Aschaffenburg (Germany)
Anne-Catherine Probst, Hochschule Aschaffenburg (Germany)
Manfred Stollenwerk, Hochschule Aschaffenburg (Germany)
Florian Emmerich, Hochschule Aschaffenburg (Germany)
Veronika Stehlíková, Czech Technical Univ. in Prague (Czech Republic)
Max-Planck Institute for Extraterrestrial Physics (Germany)
Adolf Inneman, Czech Technical Univ. in Prague (Czech Republic)

Published in SPIE Proceedings Vol. 10235:
EUV and X-ray Optics: Synergy between Laboratory and Space V
René Hudec; Ladislav Pina, Editor(s)

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