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Proceedings Paper

LSST secondary mirror assembly baseline design
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Paper Abstract

The 3.5-meter diameter Large Synoptic Survey Telescope (LSST) secondary (M2) mirror utilizes a 100mm thick meniscus ULE™ blank completed by Corning Incorporated in 2009. Sub-aperture interferometry will guide the polishing process to meet mirror structure function requirements. The convex asphere is actively supported by 72 axial actuators and 6 tangential links. These tangent links utilize an embedded lever system to meet the requirements. The axial actuators have force limiting devices. The control system utilizes a higher level "outer loop controller" for monitoring and commanding the tangent links and axial actuators. Numerous sensors determine the assembly status. To prevent thermally induced image degradation, the interior air of the M2 cell is conditioned.

Paper Details

Date Published: 17 September 2012
PDF: 19 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84440J (17 September 2012); doi: 10.1117/12.926654
Show Author Affiliations
Douglas R. Neill, National Optical Astronomy Observatory (United States)
William J. Gressler, National Optical Astronomy Observatory (United States)
Jacques Sebag, National Optical Astronomy Observatory (United States)
Oliver Wiecha, National Optical Astronomy Observatory (United States)
Mike Warner, National Optical Astronomy Observatory (Chile)
Bill Schoening, National Optical Astronomy Observatory (United States)
Joe DeVries, National Optical Astronomy Observatory (United States)
John Andrew, National Optical Astronomy Observatory (United States)
German Schumacher, National Optical Astronomy Observatory (Chile)
Edward Hileman, National Optical Astronomy Observatory (United States)


Published in SPIE Proceedings Vol. 8444:
Ground-based and Airborne Telescopes IV
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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