JWST beryllium telescope: material and substrate fabrication

Thomas B. Parsonage

doi:10.1117/12.552030

24 September 2004 JWST beryllium telescope: material and substrate fabrication

Thomas B. Parsonage

Proceedings Volume 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes; (2004) https://doi.org/10.1117/12.552030
Event: SPIE Astronomical Telescopes + Instrumentation, 2004, Glasgow, United Kingdom

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.

Citation Download Citation

Thomas B. Parsonage "JWST beryllium telescope: material and substrate fabrication", Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004); https://doi.org/10.1117/12.552030

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