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Proceedings Paper

The role of modeling in the calibration of the Chandra's optics
Author(s): Diab H. Jerius; Lester Cohen; Richard J. Edgar; Mark Freeman; Terrance J. Gaetz; John P. Hughes; Dan Nguyen; William A. Podgorski; Michael Tibbetts; Leon P. Van Speybroeck; Ping Zhao
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Paper Abstract

The mirrors flown in the Chandra Observatory are, without doubt, some of the most exquisite optics ever flown on a space mission. Their angular resolution is matched by no other X-ray observatory, existing or planned. The promise of that performance, along with a goal of achieving 1% calibration of the optics' characteristics, led to a decision early in the construction and assembly phase of the mission to develop an accurate and detailed model of the optics and their support structure. This model has served in both engineering and scientific capacities; as a cross-check of the design and a predictor of scientific performance; as a driver of the ground calibration effort; and as a diagnostic of the as-built performance. Finally, it serves, directly and indirectly, as the primary vehicle with which Chandra observers interpret the contribution of the optics' characteristics to their data. We present the underlying concepts in the model, as well the mechanical, engineering and metrology inputs. We discuss its use during ground calibration and as a characterization of on-orbit performance. Finally, we present measures of the model's accuracy, where further improvements may be made, and its applicability to other missions.

Paper Details

Date Published: 3 February 2004
PDF: 9 pages
Proc. SPIE 5165, X-Ray and Gamma-Ray Instrumentation for Astronomy XIII, (3 February 2004); doi: 10.1117/12.509378
Show Author Affiliations
Diab H. Jerius, Smithsonian Astrophysical Observatory (United States)
Lester Cohen, Smithsonian Astrophysical Observatory (United States)
Richard J. Edgar, Smithsonian Astrophysical Observatory (United States)
Mark Freeman, Smithsonian Astrophysical Observatory (United States)
Terrance J. Gaetz, Smithsonian Astrophysical Observatory (United States)
John P. Hughes, Rutgers Univ. (United States)
Dan Nguyen, Smithsonian Astrophysical Observatory (United States)
William A. Podgorski, Smithsonian Astrophysical Observatory (United States)
Michael Tibbetts, Smithsonian Astrophysical Observatory (United States)
Leon P. Van Speybroeck, Smithsonian Astrophysical Observatory (United States)
Ping Zhao, Smithsonian Astrophysical Observatory (United States)


Published in SPIE Proceedings Vol. 5165:
X-Ray and Gamma-Ray Instrumentation for Astronomy XIII
Kathryn A. Flanagan; Oswald H. W. Siegmund, Editor(s)

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