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Proceedings Paper

Current concepts for cryogenic optical testing of the JWST secondary mirror
Author(s): Koby Z. Smith; John P. Schwenker; Robert J. Brown; Joseph F. Sullivan
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Paper Abstract

The James Webb Space Telescope (JWST) Secondary Mirror (SM) is a 738 mm edge-diameter convex hyperbola that will be operating at 30K. Due to JWST’s science and technical requirements, the requirements on the SM are relatively tight. Therefore highly accurate, rigorous cryogenic testing of the surface figure as well as the prescription is required. The optical testing of a convex mirror of this size has not been performed before at cryogenic temperatures. This paper discusses the testing approaches and configurations that are under consideration at Ball Aerospace & Technologies Corp. (BATC) for testing the JWST SM at cryogenic temperatures.

Paper Details

Date Published: 24 September 2004
PDF: 11 pages
Proc. SPIE 5494, Optical Fabrication, Metrology, and Material Advancements for Telescopes, (24 September 2004); doi: 10.1117/12.554420
Show Author Affiliations
Koby Z. Smith, Ball Aerospace & Technologies Corp. (United States)
John P. Schwenker, Ball Aerospace & Technologies Corp. (United States)
Robert J. Brown, Ball Aerospace & Technologies Corp. (United States)
Joseph F. Sullivan, Ball Aerospace & Technologies Corp. (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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