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Proceedings Paper

Characterization of the JWST Pathfinder mirror dynamics using the center of curvature optical assembly (CoCOA)
Author(s): Conrad Wells; James B. Hadaway; Gene Olczak; Joseph Cosentino; John D. Johnston; Tony Whitman; Mark Connolly; David Chaney; J. Scott Knight; Randal Telfer
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Paper Abstract

The James Webb Space Telescope (JWST) Optical Telescope Element (OTE) consists of a 6.6 m clear aperture, 18 segment primary mirror, all-reflective, three-mirror anastigmat operating at cryogenic temperatures. To verify performance of the primary mirror, a full aperture center of curvature optical null test is performed under cryogenic conditions in Chamber A at the National Aeronautics and Space Administration (NASA) Johnson Space Center (JSC) using an instantaneous phase measuring interferometer. After phasing the mirrors during the JWST Pathfinder testing, the interferometer is utilized to characterize the mirror relative piston and tilt dynamics under different facility configurations. The correlation between the motions seen on detectors at the focal plane and the interferometer validates the use of the interferometer for dynamic investigations. The success of planned test hardware improvements will be characterized by the multi-wavelength interferometer (MWIF) at the Center of Curvature Optical Assembly (CoCOA).

Paper Details

Date Published: 29 July 2016
PDF: 8 pages
Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990440 (29 July 2016); doi: 10.1117/12.2234224
Show Author Affiliations
Conrad Wells, Harris Corp. (United States)
James B. Hadaway, The Univ. of Alabama in Huntsville (United States)
Gene Olczak, Harris Corp. (United States)
Joseph Cosentino, Harris Corp. (United States)
John D. Johnston, Ball Aerospace & Technologies Corp. (United States)
Tony Whitman, Harris Corp. (United States)
Mark Connolly, Harris Corp. (United States)
David Chaney, Ball Aerospace & Technologies Corp. (United States)
J. Scott Knight, Ball Aerospace & Technologies Corp. (United States)
Randal Telfer, Space Telescope Science Institute (United States)

Published in SPIE Proceedings Vol. 9904:
Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave
Howard A. MacEwen; Giovanni G. Fazio; Makenzie Lystrup; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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