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Proceedings Paper

Active supports and force optimization for the MMT primary mirror
Author(s): Hubert M. Martin; Shawn P. Callahan; Brian Cuerden; Warren B. Davison; Scott T. DeRigne; Lee R. Dettmann; Giancarlo Parodi; Thomas J. Trebisky; Steve C. West; Joseph T. Williams
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Paper Abstract

We describe the active support system and optimization of support forces for the 6.5 m primary mirror for the Multiple Mirror Telescope Conversion. The mirror was figured to an accuracy of 26 nm rms surface error, excluding certain flexible bending modes that will be controlled by support forces in the telescope. On installation of the mirror into its telescope support cell, an initial optimization of support forces is needed because of minor differences between the support used during fabrication and that in the telescope cell. The optimization is based on figure measurements made interferometrically in the vibration- isolated test tower of the Steward Observatory Mirror Lab. Actuator influence functions were determined by finite- element analysis and verified by measurement. The optimization is performed by singular value decomposition of the influence functions into normal modes. Preliminary results give a wavefront accuracy better than that of the atmosphere in 0.11 arcsecond seeing.

Paper Details

Date Published: 25 August 1998
PDF: 12 pages
Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); doi: 10.1117/12.319262
Show Author Affiliations
Hubert M. Martin, Steward Observatory/Univ. of Arizona (United States)
Shawn P. Callahan, Multiple Mirror Telescope Observatory/Univ. of Arizona (United States)
Brian Cuerden, Steward Observatory/Univ. of Arizona (United States)
Warren B. Davison, Steward Observatory/Univ. of Arizona (United States)
Scott T. DeRigne, Steward Observatory/Univ. of Arizona (United States)
Lee R. Dettmann, Steward Observatory/Univ. of Arizona (United States)
Giancarlo Parodi, BCV Progetti Srl (Italy)
Thomas J. Trebisky, Steward Observatory/Univ. of Arizona (United States)
Steve C. West, Multiple Mirror Telescope Observatory/Univ. of Arizona (United States)
Joseph T. Williams, Multiple Mirror Telescope Observatory/Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 3352:
Advanced Technology Optical/IR Telescopes VI
Larry M. Stepp, Editor(s)

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