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Proceedings Paper

Progress on the structural and mechanical design of the Giant Magellan Telescope
Author(s): Michael Sheehan; Steve Gunnels; Charles Hull; Jonathan Kern; Carey Smith; Matt Johns; Stephen Shectman
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Paper Abstract

The Giant Magellan Telescope (GMT), one of several next generation Extremely Large Telescopes (ELTs), is a 25.4 meter diameter altitude over azimuth design set to be built at the summit of Cerro Campanas at the Las Campanas Observatory in Chile. The primary mirror consists of 7 individual 8.4 meter diameter segments resulting in an equivalent collecting area of a 21.5 meter diameter single mirror. The telescope structure, optics and instrumentation has a rotating mass of approximately 1250 metric tons and stands approximately 40 meters tall. This paper reports the results of our ongoing preliminary design and development of the GMT structure and its major mechanical and opto-mechanical components. A major recent redesign of the Gregorian Instrument Rotator (GIR) resulted in significant changes to the telescope structure and several mechanisms. Design trade studies of various aspects of the main structure, hydrostatic bearing system, main axes drives, M2 positioner, M3 subsystem and the corrector-ADC subsystem have refined the preliminary design in these areas.

Paper Details

Date Published: 17 September 2012
PDF: 14 pages
Proc. SPIE 8444, Ground-based and Airborne Telescopes IV, 84440N (17 September 2012); doi: 10.1117/12.926469
Show Author Affiliations
Michael Sheehan, Giant Magellan Telescope Organization Corp. (United States)
Steve Gunnels, Paragon Engineering (United States)
Charles Hull, Giant Magellan Telescope Organization Corp. (United States)
Jonathan Kern, Giant Magellan Telescope Organization Corp. (United States)
Carey Smith, Giant Magellan Telescope Organization Corp. (United States)
Matt Johns, Giant Magellan Telescope Organization Corp. (United States)
Stephen Shectman, Giant Magellan Telescope Organization Corp. (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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