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Proceedings Paper

Figuring, polishing, metrology, and performance: analyses of Wolter type 1 forming mandrels for the Constellation-X mirror development program
Author(s): Wilhelm J. Egle; Axel Matthes; Georg Willma; Alexander Ilg; Andy Schmidt; Andreas Seifert
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Paper Abstract

Constellation-X, NASA's next major X-ray observatory, is planned to be launched in 2012/2013. Each of the four identical spacecraft contains a large diameter, spectroscopic X-ray telescope (SXT). The mirror assembly is compsed of many densely nested Wolter type 1 mirror reflectors, having segment angles of 30 or 60 degrees. The reflectors will be made of thin, accurately shaped glass sheets, onto which the reflective mirror surface is replicated from high precision, super polished Zerodur mandrels. One key issue for high-performance mirrors is the exact shape of the glass substrates. They are produced at NASA/GSFC by a dedicated hot forming process (slumping) from precision forming mandrels. The hot forming process requires special materials for the glass substrates and the forming mandrels. In this paper we report on figuring (precision machining), polishing, metrology and performance analyses of Wolter type 1 forming mandrels. The mandrels are characterized by the following features: Mandrel dimensions: 450 x 640 mm2; radius of curvature: ~800 mm; segment angle: ~40 deg; shape: hyperboloid or paraboloid; material: Zerodur K20 (Keatite) or fused silica (quartz).

Paper Details

Date Published: 11 October 2004
PDF: 10 pages
Proc. SPIE 5488, UV and Gamma-Ray Space Telescope Systems, (11 October 2004); doi: 10.1117/12.563521
Show Author Affiliations
Wilhelm J. Egle, Carl Zeiss Laser Optics GmbH (Germany)
Axel Matthes, Carl Zeiss Laser Optics GmbH (Germany)
Georg Willma, Carl Zeiss Laser Optics GmbH (Germany)
Alexander Ilg, Carl Zeiss Laser Optics GmbH (Germany)
Andy Schmidt, Carl Zeiss Laser Optics GmbH (Germany)
Andreas Seifert, Carl Zeiss Laser Optics GmbH (Germany)

Published in SPIE Proceedings Vol. 5488:
UV and Gamma-Ray Space Telescope Systems
Guenther Hasinger; Martin J. L. Turner, Editor(s)

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