15 October 2013 Slumping technique for the manufacturing of a representative x-ray grazing incidence mirror module for future space missions
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Proceedings Volume 8884, Optifab 2013; 88841Q (2013) https://doi.org/10.1117/12.2028908
Event: SPIE Optifab, 2013, Rochester, New York, United States
Abstract
The Astronomical Observatory of Brera (INAF-OAB, Italy), with the financing support of the European Space Agency (ESA), has concluded a study regarding a glass shaping technology for the production of grazing incidence segmented x-ray optics. This technique uses a hot slumping phase, in which pressure is actively applied on thin glass foils being shaped, to form a cylindrical approximation of Wolter I x-ray segments, and a subsequent cold slumping phase, in which the final Wolter I profile is then freeze into the glass segments during their integration in elemental X-ray Optical Units. The final goal of this study was the manufacturing of a prototype containing a number of slumped pair plates (meaning parabola and hyperbola couples) having representative dimensions to be tested both in UV light and in x-rays at the Panter facility (Germany). In this paper, the INAF-OAB slumping technique, comprising a shaping step and an integration step is described, together with the results obtained on the manufactured prototype modules: the first prototype was aimed to test the ad-hoc designed and built semi-automatic Integration MAchine (IMA) and debug its control software. The most complete module comprises 40 slumped segments of Schott D263 glass type of dimension 200 mm x 200 mm and thickness of 0.4 mm, slumped on Zerodur K20 mould and stacked together through glued BK7 glass structural ribs to form the first entire x-ray optical module ever built totally composed by glass. A last prototype was aimed at demonstrate the use of Schott glass AF32 type instead of D263. In particular, a new hot slumping experimental set-up is described whose advantage is to permit a better contact between mould and glass during the shaping process. The integration procedure of the slumped segments into the elemental module is also reviewed.
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Mauro Ghigo, Laura Proserpio, Stefano Basso, Oberto Citterio, Marta M. Civitani, Giovanni Pareschi, Bianca Salmaso, Giorgia Sironi, Daniele Spiga, Giampiero Tagliaferri, Gabriele Vecchi, Alberto Zambra, Giancarlo Parodi, Francesco Martelli, Daniele Gallieni, Matteo Tintori, Marcos Bavdaz, Eric Wille, Ivan Ferrario, Vadim Burwitz, "Slumping technique for the manufacturing of a representative x-ray grazing incidence mirror module for future space missions", Proc. SPIE 8884, Optifab 2013, 88841Q (15 October 2013); doi: 10.1117/12.2028908; https://doi.org/10.1117/12.2028908
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