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Proceedings Paper

Alignment of the James Webb Space Telescope Integrated Science Instrument Module Element
Author(s): Theo Hadjimichael; Raymond G. Ohl IV; Scott Antonille; David L. Aronstein; Andrew Bartoszyk; Josh Berrier; Emmanuel Cofie; Phil Coulter; Renee Gracey; Joseph Hayden; Joseph Howard; Jason Hylan; David Kubalak; Kyle McLean; Cherie Miskey; Kevin Redman; Scott Rohrbach; Derek Sabatke; Randal Telfer; Greg Wenzel; Thomas Zielinski; Joseph Sullivan; George Hartig; William Eichhorn
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Paper Abstract

NASA’s James Webb Space Telescope (JWST) is a 6.6m diameter, segmented, deployable telescope for cryogenic IR space astronomy. The JWST Observatory architecture includes the Optical Telescope Element (OTE) and the Integrated Science Instrument Module (ISIM) element which contains four science instruments (SI), including a guider. The SIs and guider are mounted to a composite metering structure with outer envelope approximate measurements of 2.2x2.2x1.7m. These SI units are integrated to the ISIM structure and optically tested at NASA Goddard Space Flight Center as an instrument suite using an Optical telescope element SIMulator (OSIM). OSIM is a high-fidelity, cryogenic JWST simulator that features a ~1.5m diameter powered mirror. The SIs are aligned to the flight structure’s coordinate system under ambient, clean room conditions using opto-mechanical metrology and customized interfaces. OSIM is aligned to the ISIM mechanical coordinate system at the cryogenic operating temperature via internal mechanisms and feedback from alignment sensors and metrology in six degrees of freedom. SI performance, including focus, pupil shear, pupil roll, boresight, wavefront error, and image quality, is evaluated at the operating temperature using OSIM. This work reports on the as-run ambient assembly and ambient alignment steps for the flight ISIM, including SI interface fixtures and customization and kinematic mount adjustment. The ISIM alignment plan consists of multiple steps to meet the “absolute” alignment requirements of the SIs and OSIM to the flight coordinate system. In this paper, we focus on key aspects of absolute, optical-mechanical alignment. We discuss various metrology and alignment techniques. In addition, we summarize our approach for dealing with and the results of ground-test factors, such as gravity.

Paper Details

Date Published: 18 October 2016
PDF: 21 pages
Proc. SPIE 9951, Optical System Alignment, Tolerancing, and Verification X, 99510C (18 October 2016); doi: 10.1117/12.2238829
Show Author Affiliations
Theo Hadjimichael, NASA Goddard Space Flight Ctr. (United States)
Raymond G. Ohl IV, NASA Goddard Space Flight Ctr. (United States)
Scott Antonille, NASA Goddard Space Flight Ctr. (United States)
David L. Aronstein, NASA Goddard Space Flight Ctr. (United States)
Andrew Bartoszyk, NASA Goddard Space Flight Ctr. (United States)
Josh Berrier, Intellectechs (United States)
Emmanuel Cofie, SGT Inc. (United States)
Phil Coulter, NASA Goddard Space Flight Ctr. (United States)
Renee Gracey, Ball Aerospace & Technologies Corp. (United States)
Joseph Hayden, Sigma Space Corp. (United States)
Joseph Howard, NASA Goddard Space Flight Ctr. (United States)
Jason Hylan, NASA Goddard Space Flight Ctr. (United States)
David Kubalak, NASA Goddard Space Flight Ctr. (United States)
Kyle McLean, Pinnacle Engineering & Management Solutions, LLC (United States)
Cherie Miskey, SGT Inc. (United States)
Kevin Redman, Sierra Lobo Inc. (United States)
Scott Rohrbach, NASA Goddard Space Flight Ctr. (United States)
Derek Sabatke, Ball Aerospace & Technologies Corp. (United States)
Randal Telfer, Space Telescope Science Institute (United States)
Greg Wenzel, Sierra Lobo Inc. (United States)
Thomas Zielinski, NASA Goddard Space Flight Ctr. (United States)
Joseph Sullivan, Ball Aerospace & Technologies Corp. (United States)
George Hartig, Space Telescope Science Institute (United States)
William Eichhorn, Genesis Engineering Solutions Inc. (United States)


Published in SPIE Proceedings Vol. 9951:
Optical System Alignment, Tolerancing, and Verification X
José Sasián; Richard N. Youngworth, Editor(s)

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