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Proceedings Paper

The center of curvature optical assembly for the JWST primary mirror cryogenic optical test: optical verification
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. Two wave front calibration tests are utilized to verify the low and Mid/High spatial frequencies, overcoming the limitations of the standard null/hologram configuration in its ability to resolve mid and high spatial frequencies. This paper will introduce the systems level architecture and optical test layout for the CoCOA.

Paper Details

Date Published: 2 August 2010
PDF: 11 pages
Proc. SPIE 7790, Interferometry XV: Techniques and Analysis, 779003 (2 August 2010); doi: 10.1117/12.861874
Show Author Affiliations
Conrad Wells, ITT Corp. Geospatial Systems (United States)
Gene Olczak, ITT Corp. Geospatial Systems (United States)
Cormic Merle, ITT Corp. Geospatial Systems (United States)
Tom Dey, ITT Corp. Geospatial Systems (United States)
Mark Waldman, ITT Corp. Geospatial Systems (United States)
Tony Whitman, ITT Corp. Geospatial Systems (United States)
Eric Wick, ITT Corp. Geospatial Systems (United States)
Aaron Peer, ITT Corp. Geospatial Systems (United States)

Published in SPIE Proceedings Vol. 7790:
Interferometry XV: Techniques and Analysis
Catherine E. Towers; Joanna Schmit; Katherine Creath, Editor(s)

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