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Manufacture of primary mirror segments for the Giant Magellan Telescope
Author(s): H. M. Martin; R. Allen; V. Gasho; B. T. Jannuzi; D. W. Kim; J. S. Kingsley; K. Law; A. Loeff; R. D. Lutz; T. J. McMahon; C. J. Oh; M. T. Tuell; S. N. Weinberger; S. C. West
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Paper Abstract

The Richard F. Caris Mirror Lab at the University of Arizona continues the production of 8.4 m lightweight honeycomb segments for the primary mirror of the Giant Magellan Telescope. GMT will have a center segment surrounded by six identical off-axis segments, plus an additional off-axis segment to allow continuous operation as segments are removed for coating. Production highlights of the last two years include the spin-casting of Segment 5, preliminary polishing of Segment 2, and completion of the rear surface processing for Segments 3 and 4. We completed a preliminary design of the significant modifications of the test systems required for Segment 4, the center segment. We finished an upgrade of the 8.4 m polishing machine; both the upgrade and experience gained with Segment 1 have contributed to much faster polishing convergence for Segment 2. Prior to polishing Segment 2, we verified the stability and accuracy of the measurement systems by re-measuring Segment 1, achieving good agreement among multiple independent tests as well as good agreement with the original acceptance tests of Segment 1.

Paper Details

Date Published: 10 July 2018
PDF: 10 pages
Proc. SPIE 10706, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III, 107060V (10 July 2018); doi: 10.1117/12.2312935
Show Author Affiliations
H. M. Martin, Steward Observatory, The Univ. of Arizona (United States)
R. Allen, Steward Observatory, The Univ. of Arizona (United States)
V. Gasho, Steward Observatory, The Univ. of Arizona (United States)
B. T. Jannuzi, Steward Observatory, The Univ. of Arizona (United States)
D. W. Kim, College of Optical Sciences, The Univ. of Arizona (United States)
J. S. Kingsley, Steward Observatory, The Univ. of Arizona (United States)
K. Law, Steward Observatory, The Univ. of Arizona (United States)
A. Loeff, Steward Observatory, The Univ. of Arizona (United States)
R. D. Lutz, Steward Observatory, The Univ. of Arizona (United States)
T. J. McMahon, Steward Observatory, The Univ. of Arizona (United States)
C. J. Oh, College of Optical Sciences, The Univ. of Arizona (United States)
M. T. Tuell, Steward Observatory, The Univ. of Arizona (United States)
S. N. Weinberger, Steward Observatory, The Univ. of Arizona (United States)
S. C. West, Steward Observatory, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 10706:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation III
Ramón Navarro; Roland Geyl, Editor(s)

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