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Proceedings Paper

Giant Magellan Telescope primary mirror cells
Author(s): Charlie Hull; Steven Gunnels; Matt Johns; Jonathan Kern; Amnon Talmor; Michael Ward; Stephen Shectman
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Paper Abstract

The Giant Magellan Telescope (GMT) Mirror cells provide positioning, support, with active optics compensation, and thermal control of the seven 8.4 meter primary mirror segments. Each mirror cell is a large steel welded structure, and in the case of the outer off axis segments, is designed to be interchangeable for any one of the 6 possible mirror positions. The mirror support and active optics compensation are provided through a series of single axis and three axis pneumatic actuators that control the force used to support the mirror at a total of 165 positions and allows for support of the mirror in any one of the six positions. Mirror positioning is provided by a stiff hexapod actuator system between the mirror and the mirror cell. Mirror thermal control is provided by a series of fans that pressurize the mirror cell and condition the air before it is directed into the mirror through 1700 nozzles.

Paper Details

Date Published: 4 August 2010
PDF: 12 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773327 (4 August 2010); doi: 10.1117/12.857843
Show Author Affiliations
Charlie Hull, GMTO Corp. (United States)
Steven Gunnels, Paragon Engineering (United States)
Matt Johns, GMTO Corp. (United States)
Jonathan Kern, GMTO Corp. (United States)
Amnon Talmor, GMTO Corp. (United States)
Michael Ward, GMTO Corp. (United States)
Stephen Shectman, GMTO Corp. (United States)


Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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