ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 55, (4) 418 - 424 (2011)


GLASS AND SILICON FOILS FOR X-RAY SPACE TELESCOPE MIRRORS
 
Mika M. 1, Pina L. 2, Landova M. 1, Jankovsky O. 1, Kacerovsky R. 1, Sveda L. 2, Havlikova R. 2, Hudec R. 3, Marsikova V. 4, Inneman A. 4
 
1 Institute of Chemical Technology, Technicka 5, Prague, Czech Republic
2 Czech Technical University, Faculty of Nuclear Sciences, Brehova 7, Prague, Czech Republic
3 Astronomical Institute, Academy of Sciences, Fricova 298, Ondrejov, Czech Republic
4 Rigaku Innovative Technologies Europe s.r.o., Novodvorska 994, Prague, Czech Republic

Keywords: Glass, Silicon, Thermal forming, X-ray
 

Unique observations delivered by space X-ray imaging telescopes have been significantly contributing to important discoveries of current astrophysics. The telescopes’ most crucial part is a high throughput, heavily nested mirror array reflecting X-rays and focusing them to a detector. Future astronomical projects on large X-ray telescopes require novel materials and technologies for the construction of the reflecting mirrors. The future mirrors must be lightweight and precisely shaped to achieve large collecting area with high angular resolution of a few arc sec. The new materials and technologies must be cost-effective as well. Currently, the most promising materials are glass or silicon foils which are commercially produced on a large scale. A thermal forming process was used for the precise shaping of these foils. The forced and free slumping of the foils was studied in the temperature range of hot plastic deformation and the shapes obtained by the different slumping processes were compared. The shapes and the surface quality of the foils were measured by a Taylor Hobson contact profilemeter, a ZYGO interferometer and Atomic Forced Microscopy. In the experiments, both heat-treatment temperature and time were varied following our experiment design. The obtained data and relations can be used for modelling and optimizing the thermal forming procedure.


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