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Proceedings Paper

On-orbit adjustment calculation for the Generation-X x-ray mirror figure
Author(s): Daniel A. Schwartz; Roger J. Brissenden; Martin Elvis; Guiseppina Fabbiano; Terrance J. Gaetz; Diab Jerius; Michael Juda; Paul B. Reid; Scott J. Wolk; Stephen L. O'Dell; Jeffrey K. Kolodziejczak; William W. Zhang
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Paper Abstract

Generation-X will be an X-ray observatory with 50 m2 collecting area at 1 keV and 0.1" angular resolution. A key concept to enable such a dramatic improvement in angular resolution is that the mirror figure will be adjusted on-orbit; e.g., via piezo-electric actuators deposited on the back side of very thin glass and imparting strains in a bi-morph configuration. To make local adjustments to the individual mirror shells we must employ an imaging detector far forward of the focal surface, so that rays from the individual shells can be measured as distinct rings. We simulate this process on a few representative shells via ray-traces of perfect optics, perturbed axially by low order Legendre polynomial terms. This elucidates some of the requirements for the on-orbit measurements, and on possible algorithms to perform the on-orbit adjustment with acceptably rapid convergence.

Paper Details

Date Published: 15 July 2008
PDF: 9 pages
Proc. SPIE 7011, Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray, 70110W (15 July 2008); doi: 10.1117/12.790085
Show Author Affiliations
Daniel A. Schwartz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Roger J. Brissenden, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Martin Elvis, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Guiseppina Fabbiano, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Terrance J. Gaetz, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Diab Jerius, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Michael Juda, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Paul B. Reid, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Scott J. Wolk, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stephen L. O'Dell, NASA Marshall Space Flight Ctr. (United States)
Jeffrey K. Kolodziejczak, NASA Marshall Space Flight Ctr. (United States)
William W. Zhang, NASA Goddard Space Flight Ctr. (United States)


Published in SPIE Proceedings Vol. 7011:
Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray
Martin J. L. Turner; Kathryn A. Flanagan, Editor(s)

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