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Proceedings Paper

JWST center of curvature test method and results
Author(s): Babak Saif; David Chaney; Perry Greenfield; Kyle Van Gorkom; Keira Brooks; Warren Hack; Marcel Bluth; Josh Bluth; James Sanders; Koby Smith; Larkin Carey; Sze Chaung; Ritva Keski-Kuha; Lee Feinberg; Severine Tournois; W. Scott Smith; Vladimir Kradinov
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Paper Abstract

The James Webb Space Telescope (JWST) recently saw the completion of the assembly process for the Optical Telescope Element and Integrated Science Instrument Module (OTIS). This integration effort was performed at Goddard Space Flight Center (GSFC) in Greenbelt, Maryland. In conjunction with this assembly process a series of vibration and acoustic tests were performed. To help assure the telescope’s primary mirror was not adversely impacted by this environmental testing an optical center of curvature (CoC) test was performed to measure changes in the mirror’s optical performance. The primary is a 6.5 meter diameter mirror consisting of 18 individual hexagonal segments. Each segment is an off-axis asphere. There are a total of three prescriptions repeated six times each. As part of the CoC test each segment was individually measured using a high-speed interferometer (HSI) designed and built specifically for this test. This interferometer is capable of characterizing both static and dynamic characteristics of the mirrors. The latter capability was used, with the aid of a vibration stinger applying a low-level input force, to measure the dynamic characteristic changes of the PM backplane structure. This paper describes the CoC test setup, an innovative alignment method, and both static and dynamic test results.

Paper Details

Date Published: 5 September 2017
PDF: 15 pages
Proc. SPIE 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems, 104010T (5 September 2017); doi: 10.1117/12.2273974
Show Author Affiliations
Babak Saif, NASA Goddard Space Flight Ctr. (United States)
David Chaney, Ball Aerospace & Technologies Corp. (United States)
Perry Greenfield, Space Telescope Science Institute (United States)
Kyle Van Gorkom, Space Telescope Science Institute (United States)
Keira Brooks, Space Telescope Science Institute (United States)
Warren Hack, Space Telescope Science Institute (United States)
Marcel Bluth, SGT, Inc. (United States)
Josh Bluth, SGT, Inc. (United States)
James Sanders, NASA Goddard Space Flight Ctr. (United States)
Koby Smith, Ball Aerospace & Technologies Corp. (United States)
Larkin Carey, Ball Aerospace & Technologies Corp. (United States)
Sze Chaung, Orbital ATK Space Systems (United States)
Ritva Keski-Kuha, NASA Goddard Space Flight Ctr. (United States)
Lee Feinberg, NASA Goddard Space Flight Ctr. (United States)
Severine Tournois, NASA Goddard Space Flight Ctr. (United States)
W. Scott Smith, NASA Marshall Space Flight Ctr. (United States)
Vladimir Kradinov, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 10401:
Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems
Tony B. Hull; Dae Wook Kim; Pascal Hallibert, Editor(s)

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