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Proceedings Paper

Wavefront sensing and controls for the James Webb Space Telescope
Author(s): D. Scott Acton; J. Scott Knight; A. Contos; Stefano Grimaldi; J. Terry; P. Lightsey; A. Barto; B. League; Bruce Dean; J. Scott Smith; Charles Bowers; D. Aronstein; L. Feinberg; W. Hayden; T. Comeau; R. Soummer; E. Elliott; M. Perrin; Carl W. Starr
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Paper Abstract

The James Webb Space Telescope (JWST) is a segmented deployable telescope, utilizing 6 degrees of freedom for adjustment of the Secondary Mirror (SM) and 7 degrees of freedom for adjustment of each of its 18 segments in the Primary Mirror (PM). When deployed, the PM segments and the SM will be placed in their correct optical positions to within a few mm, with accordingly large wavefront errors. The challenge, therefore, is to position each of these optical elements in order to correct the deployment errors and produce a diffraction-limited telescope, at λ=2μm, across the entire science field. This paper describes a suite of processes, algorithms, and software that has been developed to achieve this precise alignment, using images taken from JWST’s science instruments during commissioning. The results of flight-like end-to-end simulations showing the commissioning process are also presented.

Paper Details

Date Published: 21 September 2012
PDF: 11 pages
Proc. SPIE 8442, Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave, 84422H (21 September 2012); doi: 10.1117/12.925015
Show Author Affiliations
D. Scott Acton, Ball Aerospace & Technologies Corp. (United States)
J. Scott Knight, Ball Aerospace & Technologies Corp. (United States)
A. Contos, Ball Aerospace & Technologies Corp. (United States)
Stefano Grimaldi, Ball Aerospace & Technologies Corp. (United States)
J. Terry, Ball Aerospace & Technologies Corp. (United States)
P. Lightsey, Ball Aerospace & Technologies Corp. (United States)
A. Barto, Ball Aerospace & Technologies Corp. (United States)
B. League, Ball Aerospace & Technologies Corp. (United States)
Bruce Dean, NASA Goddard Space Flight Ctr. (United States)
J. Scott Smith, NASA Goddard Space Flight Ctr. (United States)
Charles Bowers, NASA Goddard Space Flight Ctr. (United States)
D. Aronstein, NASA Goddard Space Flight Ctr. (United States)
L. Feinberg, NASA Goddard Space Flight Ctr. (United States)
W. Hayden, NASA Goddard Space Flight Ctr. (United States)
T. Comeau, Space Telescope Science Institute (United States)
R. Soummer, Space Telescope Science Institute (United States)
E. Elliott, Space Telescope Science Institute (United States)
M. Perrin, Space Telescope Science Institute (United States)
Carl W. Starr, Northrop Grumman Aerospace Systems (United States)


Published in SPIE Proceedings Vol. 8442:
Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave
Mark C. Clampin; Giovanni G. Fazio; Howard A. MacEwen; Jacobus M. Oschmann, Editor(s)

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