JWST beryllium telescope: material and substrate fabrication

Details JWST beryllium telescope: material and substrate fabrication JWST beryllium telescope: material and substrate fabrication

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5494...39p&link_type=abstract

Optical Fabrication, Metrology, and Material Advancements for Telescopes, Edited by E. Atad-Ettedgui and P. Dierickx. Procee

Physics

Optics

Scientific paper

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.

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