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Proceedings Paper

Optical performance verification of the James Webb Space Telescope
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Paper Abstract

The James Webb Space Telescope (JWST) is a large aperture (6.6 m primary mirror) cryogenic telescope with active control of the segmented primary and secondary mirror optical elements. The architecture of the telescope makes full end-to-end testing on the ground prohibitive due to both cost and technical considerations. Additionally, because the telescope will be launched in a folded configuration to fit in the Ariane V launch fairing and aligned during flight using image-based Wavefront Sensing and Control (WFS&C), the telescope cannot be tested in the classical "test-as-you-fly" architecture. Due to these considerations, the primary optical performance requirements will be verified through analysis. In order to have high confidence in this approach, a robust analysis validation program has been developed based on testing from the component level through the integrated telescope level. This verification approach focuses on ground testing at the telescope level to ensure there will be adequate range in the adjustable optics for alignment on orbit. In addition to the incremental test program planned for optical verification, a double-pass sampled aperture test of the integrated telescope and instruments is planned at flight-like temperatures as a crosscheck to the analytic verification for flight. Error budgets have been developed to understand the uncertainty propagation through the test and analysis program.

Paper Details

Date Published: 12 July 2008
PDF: 11 pages
Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 70100P (12 July 2008); doi: 10.1117/12.790483
Show Author Affiliations
Allison A. Barto, Ball Aerospace & Technologies Corp. (United States)
Charlie Atkinson, Northrop Grumman Space Technologies (United States)
James Contreras, Ball Aerospace & Technologies Corp. (United States)
Paul A. Lightsey, Ball Aerospace & Technologies Corp. (United States)
Charley Noecker, Ball Aerospace & Technologies Corp. (United States)
Mark Waldman, ITT Corp. (United States)
Tony Whitman, ITT Corp. (United States)

Published in SPIE Proceedings Vol. 7010:
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
Jacobus M. Oschmann; Mattheus W. M. de Graauw; Howard A. MacEwen, Editor(s)

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