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Proceedings Paper

An overview of optical fabrication of the JWST mirror segments at Tinsley
Author(s): Glen C. Cole; Robert Garfield; Tracy Peters; Wendell Wolff; Kris Johnson; Robert Bernier; Craig Kiikka; Taha Nassar; Howard A. Wong; John Kincade; Tony Hull; Ben Gallagher; David Chaney; Robert J. Brown; Andrew McKay; Lester M. Cohen
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Paper Abstract

The context, preparation, and facilitization of Tinsley to produce the 18 JWST primary mirror segments are described, and an overview of the Project at Tinsley is presented. The mirror segments are aggressively lightweighted, approximately hexagonal, and approximately 1.32m flat-to-flat. While the optical finishing approach is strongly seated in Tinsley's Computer Controlled Optical Surfacing (CCOSTM) technology, extensions have been implemented to address safe and efficient nearly simultaneous flow of the high value mirror segments through numerous cycles of optical finishing, processing and metrology steps. JWST will operate at cryogenic temperatures, and Tinsley will do final figuring from a "hit map" made during cryogenic testing at the NASA MSFC X-Ray Calibration Facility (XRCF). A formal beryllium safety protocol has been established throughout. Extensive handling fixtures assure that the mirrors are moved from station to station experiencing low accelerations. A rigorous qualification process is applied to each new fixture, machine and instrument. Special problems of cryo figuring, and co-finishing the segments to stringent specifications are described.

Paper Details

Date Published: 10 June 2006
PDF: 9 pages
Proc. SPIE 6265, Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter, 62650V (10 June 2006); doi: 10.1117/12.672926
Show Author Affiliations
Glen C. Cole, Tinsley Labs. (United States)
Robert Garfield, Tinsley Labs. (United States)
Tracy Peters, Tinsley Labs. (United States)
Wendell Wolff, Tinsley Labs. (United States)
Kris Johnson, Tinsley Labs. (United States)
Robert Bernier, Tinsley Labs. (United States)
Craig Kiikka, Tinsley Labs. (United States)
Taha Nassar, Tinsley Labs. (United States)
Howard A. Wong, Tinsley Labs. (United States)
John Kincade, Tinsley Labs. (United States)
Tony Hull, Tinsley Labs. (United States)
Ben Gallagher, Ball Aerospace & Technologies Corp. (United States)
David Chaney, Ball Aerospace & Technologies Corp. (United States)
Robert J. Brown, Ball Aerospace & Technologies Corp. (United States)
Andrew McKay, Northrop Grumman Space Technology (United States)
Lester M. Cohen, Smithsonian Astrophysical Observatory (United States)

Published in SPIE Proceedings Vol. 6265:
Space Telescopes and Instrumentation I: Optical, Infrared, and Millimeter
John C. Mather; Howard A. MacEwen; Mattheus W. M. de Graauw, Editor(s)

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