5 September 2017 JWST center of curvature test method and results
Author Affiliations +
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.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Babak Saif, Babak Saif, David Chaney, David Chaney, Perry Greenfield, Perry Greenfield, Kyle Van Gorkom, Kyle Van Gorkom, Keira Brooks, Keira Brooks, Warren Hack, Warren Hack, Marcel Bluth, Marcel Bluth, Josh Bluth, Josh Bluth, James Sanders, James Sanders, Koby Smith, Koby Smith, Larkin Carey, Larkin Carey, Sze Chaung, Sze Chaung, Ritva Keski-Kuha, Ritva Keski-Kuha, Lee Feinberg, Lee Feinberg, Severine Tournois, Severine Tournois, W. Scott Smith, W. Scott Smith, Vladimir Kradinov, Vladimir Kradinov, } "JWST center of curvature test method and results", Proc. SPIE 10401, Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems, 104010T (5 September 2017); doi: 10.1117/12.2273974; https://doi.org/10.1117/12.2273974

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