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Proceedings Paper

The center of curvature optical assembly for the JWST primary mirror cryogenic optical test
Author(s): Conrad Wells; Gene Olczak; Cormic Merle; Tom Dey; Mark Waldman; Tony Whitman; Eric Wick; Aaron Peer
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Paper Abstract

The James Webb Space Telescope (JWST) Optical Telescope Element (OTE) consists of a 6.6 m clear aperture, allreflective, three-mirror anastigmat. The 18-segment primary mirror (PM) presents unique and challenging assembly, integration, alignment and testing requirements. A full aperture center of curvature optical test is performed in cryogenic vacuum conditions at the integrated observatory level to verify PM performance requirements. The Center of Curvature Optical Assembly (CoCOA), designed and being built by ITT satisfies the requirements for this test. The CoCOA contains a multi wave interferometer, patented reflective null lens, actuation for alignment, full in situ calibration capability, coarse and fine alignment sensing systems, as well as a system for monitoring changes in the PM to CoCOA distance. This paper will introduce the systems level architecture and optical layout of the CoCOA and its main subsystems.

Paper Details

Date Published: 19 July 2010
PDF: 12 pages
Proc. SPIE 7739, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation, 77390L (19 July 2010); doi: 10.1117/12.858617
Show Author Affiliations
Conrad Wells, ITT Geospatial Systems (United States)
Gene Olczak, ITT Geospatial Systems (United States)
Cormic Merle, ITT Geospatial Systems (United States)
Tom Dey, ITT Geospatial Systems (United States)
Mark Waldman, ITT Geospatial Systems (United States)
Tony Whitman, ITT Geospatial Systems (United States)
Eric Wick, ITT Geospatial Systems (United States)
Aaron Peer, ITT Geospatial Systems (United States)

Published in SPIE Proceedings Vol. 7739:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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