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10 July 2008 The Giant Magellan Telescope (GMT): structure design update
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Steven Gunnels, Frank Kan, and Andrew Sarawit "The Giant Magellan Telescope (GMT): structure design update", Proc. SPIE 7012, Ground-based and Airborne Telescopes II, 70122F (10 July 2008);


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