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Proceedings Paper

Primary mirror figure maintenance of the Hobby-Eberly Telescope using the segment alignment maintenance system
Author(s): John M. Rakoczy; Drew Hall; Richard T. Howard; William Ly; John T. Weir; Edward E. Montgomery; Mark T. Adams; John A. Booth; James R. Fowler; Gregory H. Ames
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Paper Abstract

The Segment Alignment Maintenance System (SAMS) was installed on McDonald Observatory's Hobby-Eberly Telescope (HET) in August 2001. The SAMS became fully operational in October 2001. The SAMS uses a system of 480 inductive edge sensors to correct misalignments of the HET's 91 primary mirror segments when the segments are perturbed from their aligned reference positions. A special observer estimates and corrects for the global radius of curvature (GRoC) mode, a mode unobservable by the edge sensors. The SAMS edge sensor system and GRoC estimator are able to maintain HET's primary figure for longer durations than previously had been observed. This paper gives a functional description of the SAMS control system and presents performance verification data.

Paper Details

Date Published: 4 February 2003
PDF: 12 pages
Proc. SPIE 4837, Large Ground-based Telescopes, (4 February 2003); doi: 10.1117/12.456734
Show Author Affiliations
John M. Rakoczy, NASA Marshall Space Flight Ctr. (United States)
Drew Hall, NASA Marshall Space Flight Ctr. (United States)
Richard T. Howard, NASA Marshall Space Flight Ctr. (United States)
William Ly, NASA Marshall Space Flight Ctr. (United States)
John T. Weir, NASA Marshall Space Flight Ctr. (United States)
Edward E. Montgomery, NASA Marshall Space Flight Ctr. (United States)
Mark T. Adams, McDonald Observatory/Univ. of Texas at Austin (United States)
John A. Booth, McDonald Observatory/Univ. of Texas at Austin (United States)
James R. Fowler, McDonald Observatory/Univ. of Texas at Austin (United States)
Gregory H. Ames, Blue Line Engineering Co. (United States)


Published in SPIE Proceedings Vol. 4837:
Large Ground-based Telescopes
Jacobus M. Oschmann; Larry M. Stepp, Editor(s)

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