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Proceedings Paper

Successful production of the engineering development unit (EDU) primary mirror segment and flight unit tertiary mirror for JWST
Author(s): Andrea Arneson; Chris Alongi; Rob Bernier; Ed Boese; Jay Daniel; Lee Dettmann; Robert Garfield; Holger Glatzel; John Kincade; Patrick Johnson; Allen Lee; Adam Magruder; Ankit Patel; Martin Seilonen; Gary Surges; Mark Bergeland; Robert J. Brown; Benjamin Gallagher; Andrew McKay; Lester M. Cohen
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Paper Abstract

During 2009, Tinsley finished most of the Configuration 1 pre-cryo test Computer Controlled Optical Surfacing (CCOS) operations on the James Webb Space Telescope primary mirror segments and in mid-2009 we began the Configuration 2 post-cryo test CCOS operations. After completing the grinding and polishing operations, including final figuring to a cryo-null target, we delivered the finished Engineering Development Unit (EDU) to Ball Aerospace Technology Corporation on 4 December 2009. Achieving fabrication and metrology conditions to meet the specifications for this off-axis ~1.5 m hexagonal point-to-point segmented mirror required special methods. Achieving repeatable and accurate interferometric alignment of the off-axis aspherical mirror surface and stable thermal gradient control of the beryllium substructure during tests required rigorous component and system-level validation. Final optical wavefront measurements over the various spatial frequency ranges have demonstrated that all of the requirements are met. This success has validated our processes of fabrication and metrology and allows us to proceed with the production of the 18 flight mirror segments. The first finished flight mirror, the Tertiary Mirror, was shipped to BATC on 24 February, 2010. Performance of that mirror is reported here also.

Paper Details

Date Published: 4 August 2010
PDF: 11 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77310I (4 August 2010); doi: 10.1117/12.858049
Show Author Affiliations
Andrea Arneson, L-3 Communications Tinsley Labs. Inc. (United States)
Chris Alongi, L-3 Communications Tinsley Labs. Inc. (United States)
Rob Bernier, L-3 Communications Tinsley Labs. Inc. (United States)
Ed Boese, L-3 Communications Tinsley Labs. Inc. (United States)
Jay Daniel, L-3 Communications Tinsley Labs. Inc. (United States)
Lee Dettmann, L-3 Communications Tinsley Labs. Inc. (United States)
Robert Garfield, L-3 Communications Tinsley Labs. Inc. (United States)
Holger Glatzel, L-3 Communications Tinsley Labs. Inc. (United States)
John Kincade, L-3 Communications Tinsley Labs. Inc. (United States)
Patrick Johnson, L-3 Communications Tinsley Labs. Inc. (United States)
Allen Lee, L-3 Communications Tinsley Labs. Inc. (United States)
Adam Magruder, L-3 Communications Tinsley Labs. Inc. (United States)
Ankit Patel, L-3 Communications Tinsley Labs. Inc. (United States)
Martin Seilonen, L-3 Communications Tinsley Labs. Inc. (United States)
Gary Surges, L-3 Communications Tinsley Labs. Inc. (United States)
Mark Bergeland, Ball Aerospace & Technologies Corp. (United States)
Robert J. Brown, Ball Aerospace & Technologies Corp. (United States)
Benjamin Gallagher, Ball Aerospace & Technologies Corp. (United States)
Andrew McKay, Northrop Grumman Aerospace Systems (United States)
Lester M. Cohen, Smithsonian Astrophysical Observatory (United States)


Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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