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Proceedings Paper

JWST beryllium telescope: material and substrate fabrication
Author(s): Thomas B. Parsonage
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Paper Abstract

A new grade of beryllium, O-30, has been chosen for the primary, secondary, and tertiary cryogenic optics for the James Webb Space Telescope (JWST) program. This paper will describe the characterization of O-30 beryllium for this cryogenic space telescope, including cryogenic material properties. It will also show the cryogenic performance data that resulted in the selection of the O-30 beryllium for the JWST primary mirror, as compared to the other material candidate ULE. The paper will also describe the consolidation process of this 1.315-meter hexagon segment to produce a highly isotropic mirror segment. In addition, this paper will describe a technology effort called near net shape (NNS), to significantly reduce the cost of beryllium substrates for future cryogenic telescopes like SPICA, SAFIR, and GMST.

Paper Details

Date Published: 24 September 2004
PDF: 10 pages
Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004); doi: 10.1117/12.552030
Show Author Affiliations
Thomas B. Parsonage, Brush Wellman Inc. (United States)

Published in SPIE Proceedings Vol. 5494:
Optical Fabrication, Metrology, and Material Advancements for Telescopes
Eli Atad-Ettedgui; Philippe Dierickx, Editor(s)

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