29 July 2016 Characterization of the JWST Pathfinder mirror dynamics using the center of curvature optical assembly (CoCOA)
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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).
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Conrad Wells, Conrad Wells, James B. Hadaway, James B. Hadaway, Gene Olczak, Gene Olczak, Joseph Cosentino, Joseph Cosentino, John D. Johnston, John D. Johnston, Tony Whitman, Tony Whitman, Mark Connolly, Mark Connolly, David Chaney, David Chaney, J. Scott Knight, J. Scott Knight, Randal Telfer, Randal Telfer, "Characterization of the JWST Pathfinder mirror dynamics using the center of curvature optical assembly (CoCOA)", Proc. SPIE 9904, Space Telescopes and Instrumentation 2016: Optical, Infrared, and Millimeter Wave, 990440 (29 July 2016); doi: 10.1117/12.2234224; https://doi.org/10.1117/12.2234224
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