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23 July 2008 Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope
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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.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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, and T. Zobrist "Progress in manufacturing the first 8.4 m off-axis segment for the Giant Magellan Telescope", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70180C (23 July 2008);

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