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Proceedings Paper

Development of the primary mirror segment support assemblies for the Thirty Meter Telescope
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Paper Abstract

This paper describes the studies performed to establish a baseline conceptual design of the Segment Support Assembly (SSA) for the Thirty Meter Telescope (TMT) primary mirror. The SSA uses a combination of mechanical whiffletrees for axial support, a central diaphragm for lateral support, and a whiffletree-based remote-controlled warping harness for surface figure corrections. Axial support whiffletrees are numerically optimized to minimize the resulting gravityinduced deformation. Although a classical central diaphragm solution was eventually adopted, several lateral support concepts are considered. Warping harness systems are analyzed and optimized for their effectiveness at correcting second and third order optical aberrations. Thermal deformations of the optical surface are systematically analyzed using finite element analysis. Worst-case performance of the complete system as a result of gravity loading and temperature variations is analyzed as a function of zenith angle using an integrated finite element model.

Paper Details

Date Published: 6 July 2006
PDF: 19 pages
Proc. SPIE 6273, Optomechanical Technologies for Astronomy, 627319 (6 July 2006); doi: 10.1117/12.670604
Show Author Affiliations
Eric Ponslet, HYTEC, Inc. (United States)
Dan Blanco, NOAO (United States)
Myung Cho, NOAO (United States)
Terry Mast, Ctr. for Adaptive Optics, Univ. of California, Santa Cruz (United States)
Jerry Nelson, Ctr. for Adaptive Optics, Univ. of California, Santa Cruz (United States)
R. J. Ponchione, HYTEC, Inc. (United States)
Mark Sirota, TMT Project (United States)
Vince Stephens, HYTEC, Inc. (United States)
Larry Stepp, TMT Project (United States)
Alan Tubb, HYTEC, Inc. (United States)
Eric C. Williams, HYTEC, Inc. (United States)

Published in SPIE Proceedings Vol. 6273:
Optomechanical Technologies for Astronomy
Eli Atad-Ettedgui; Joseph Antebi; Dietrich Lemke, Editor(s)

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