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Proceedings Paper

The Giant Magellan Telescope (GMT): structure design update
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Paper Abstract

The Giant Magellan Telescope (GMT) is a 21.5-meter equivalent aperture optical-infrared ELT to be located in Chile. It is being designed and constructed by a group of U.S. and international universities and research institutions1. The concept design of the telescope structure was summarized in an earlier SPIE paper2 and described in greater detail in the GMT Conceptual Design Review document3. The structure design has matured during the current Design Development Phase. Important among design improvements has been optimization of the secondary truss with the goal of significantly reducing telescope pointing errors due to wind loading. Three detailed structural changes have resulted in calculated pointing error reductions of ~30%. The changes and their contributions to the improved performance as well as other tested features are discussed. Additional refinements to the structure include the instrument mounting system, with a stationary folded-instrument platform plus Gregorian Instrument Rotator utilizing hydrostatic bearings. More detailed features, such as revised C-ring bracing to improve instrument access, are described.

Paper Details

Date Published: 10 July 2008
PDF: 13 pages
Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70122F (10 July 2008); doi: 10.1117/12.789459
Show Author Affiliations
Steven Gunnels, Paragon Engineering (United States)
Frank Kan, Simpson Gumpertz & Heger (United States)
Andrew Sarawit, Simpson Gumpertz & Heger (United States)

Published in SPIE Proceedings Vol. 7012:
Ground-based and Airborne Telescopes II
Larry M. Stepp; Roberto Gilmozzi, Editor(s)

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