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Optical Engineering

Accurate integration of segmented x-ray optics using interfacing ribs
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Paper Abstract

Future lightweight and long-focal-length x-ray telescopes must guarantee a good angular resolution (e.g., 5 arc sec HEW) and reach an unprecedented large effective area. This goal can be reached with the slumping of borosilicate glass sheets that allow the fabrication of lightweight and low-cost x-ray optical units (XOU). These XOUs, based on mirror segments, have to be assembled together to form complete multishell Wolter-I optics. The technology for the fabrication and the integration of these XOUs is under development in Europe, funded by European Space Agency, and led by the Brera Observatory (INAF-OAB). While the achievement of the required surface accuracy on the glass segments by means of a hot slumping technique is a challenging aspect, adequate attention must be given to the correct integration and coalignment of the mirror segments into the XOUs. To this aim, an innovative assembly concept has been investigated, based on glass reinforcing ribs. The ribs connect pairs of consecutive foils, stacked into a XOU, with both structural and functional roles, providing robust monolithic stacks of mirror plates. Moreover, this integration concept allows the correction of residual low-frequency errors still present on the mirror foil profile after slumping. We present the integration concept, the related error budget, and the results achieved so far with a semi-robotic integration machine especially designed and realized to assemble slumped glass foils into XOUs.

Paper Details

Date Published: 24 June 2013
PDF: 11 pages
Opt. Eng. 52(9) 091809 doi: 10.1117/1.OE.52.9.091809
Published in: Optical Engineering Volume 52, Issue 9
Show Author Affiliations
Marta M. Civitani, INAF - Osservatorio Astronomico di Brera (Italy)
Stefano Basso, INAF - Osservatorio Astronomico di Brera (Italy)
Oberto Citterio, INAF - Osservatorio Astronomico di Brera (Italy)
Paolo Conconi, INAF - Osservatorio Astronomico di Brera (Italy)
Mauro Ghigo, INAF - Osservatorio Astronomico di Brera (Italy)
Giovanni Pareschi, INAF - Osservatorio Astronomico di Brera (Italy)
Laura Proserpio, INAF - Osservatorio Astronomico di Brera (Italy)
Bianca Salmaso, INAF - Osservatorio Astronomico di Brera (Italy)
Giorgia Sironi, INAF - Osservatorio Astronomico di Brera (Italy)
Daniele Spiga, INAF - Osservatorio Astronomico di Brera (Italy)
Gianpiero Tagliaferri, INAF - Osservatorio Astronomico di Brera (Italy)
Alberto Zambra, INAF - Osservatorio Astronomico di Brera (Italy)
Francesco Martelli, BCV Progetti S.r.l. (Italy)
Giancarlo Parodi, BCV Progetti S.r.l. (Italy)
Pierluigi Fumi, A.D.S. International S.r.l. (Italy)
Daniele Gallieni, A.D.S. International S.r.l. (Italy)
Matteo Tintori, A.D.S. International S.r.l. (Italy)
Marcos Bavdaz, European Space Research and Technology Ctr. (Netherlands)
Eric Wille, European Space Research and Technology Ctr. (Netherlands)


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