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Proceedings Paper

Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope
Author(s): H. M. Martin; J. H. Burge; B. Cuerden; W. B. Davison; J. S. Kingsley; W. C. Kittrell; R. D. Lutz; S. M. Miller; C. Zhao; T. Zobrist
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Paper Abstract

The first of the 8.4 m off-axis segments for the primary mirror of the Giant Magellan Telescope is being manufactured at the Steward Observatory Mirror Lab. In addition to the manufacture of the segment, this project includes the development of a complete facility to make and measure all seven segments. We have installed a new 28 m test tower and designed a set of measurements to guide the fabrication and qualify the finished segments. The first test, a laser-tracker measurement of the ground surface, is operational. The principal optical test is a full-aperture interferometric test with a null corrector that includes a 3.75 m spherical mirror, a smaller sphere, and a computer-generated hologram. We have also designed a scanning pentaprism test to validate the measurement of low-order aberrations. The first segment has been cast and generated, and is in the process of loose-abrasive grinding.

Paper Details

Date Published: 23 July 2008
PDF: 12 pages
Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180C (23 July 2008); doi: 10.1117/12.789805
Show Author Affiliations
H. M. Martin, The Univ. of Arizona, Steward Observatory (United States)
J. H. Burge, The Univ. of Arizona, Steward Observatory (United States)
College of Optical Sciences, The Univ. of Arizona (United States)
B. Cuerden, The Univ. of Arizona, Steward Observatory (United States)
W. B. Davison, The Univ. of Arizona, Steward Observatory (United States)
J. S. Kingsley, The Univ. of Arizona, Steward Observatory (United States)
W. C. Kittrell, The Univ. of Arizona, Steward Observatory (United States)
R. D. Lutz, The Univ. of Arizona, Steward Observatory (United States)
S. M. Miller, The Univ. of Arizona, Steward Observatory (United States)
C. Zhao, College of Optical Sciences, The Univ. of Arizona (United States)
T. Zobrist, College of Optical Sciences, The Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 7018:
Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation
Eli Atad-Ettedgui; Dietrich Lemke, Editor(s)

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