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Proceedings Paper

LSST primary, secondary, and tertiary mirror support systems
Author(s): Brian Cuerden; Jacques Sebag; Scott Mathews; Myung Cho; Joon Lee; Steven West
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Paper Abstract

The current LSST Baseline Configuration has a field of view of 3.5 degrees and an optical etendue of 302 meters square degrees square. The etendue calculation includes the effect of gradual vignetting by the camera as the field angle increases. A current optical point design includes an 8.4 m spun cast light-weighted borosilicate primary mirror, a 3.2 m secondary mirror and a 5.0 m tertiary mirror. The goal of this study is to determine if these mirrors can be actively supported and retain figure control over elevation angles without closed-loop control based on wave-front measurement. Support systems for the tertiary and primary mirrors are adapted from proven systems utilized on 6.5 and 8.4 m class primaries developed by the University of Arizona's Mirror Laboratory. The number and locations of axial and lateral supports is determined for each mirror and the gravitational and support induced surface distortions are calculated and are shown to be within budgeted limits. The support components and their performance are described and it is demonstrated that predicted mirror distortion attributable to the support system is consistent with the known performance of the support components.

Paper Details

Date Published: 29 September 2004
PDF: 15 pages
Proc. SPIE 5495, Astronomical Structures and Mechanisms Technology, (29 September 2004); doi: 10.1117/12.550637
Show Author Affiliations
Brian Cuerden, Steward Observatory/Univ. of Arizona (United States)
Jacques Sebag, National Optical Astronomy Observatory (United States)
Scott Mathews, Steward Observatory/Univ. of Arizona (United States)
Myung Cho, National Optical Astronomy Observatory (United States)
Joon Lee, National Optical Astronomy Observatory (United States)
Steven West, Steward Observatory/Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 5495:
Astronomical Structures and Mechanisms Technology
Joseph Antebi; Dietrich Lemke, Editor(s)

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