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Proceedings Paper

The acquisition, guiding, and wavefront sensing system for the Giant Magellan Telescope
Author(s): Brian McLeod; Daniel Catropa; Daniel Durusky; Jan Kansky; Derek Kopon; Kenneth McCracken; Stuart McMuldroch; William Podgorski; Antonin Bouchez
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Paper Abstract

The Acquisition Guiding and Wavefront Sensing System (AGWS) is responsible for making the measurements required to keep the optics of the seven-segment GMT coaligned, phased, pointing in the correct direction, and conforming to the correct mirror shape. The AGWS consists of four identical probes that patrol the outer parts of the GMT field of view. Each probe is comprised of two channels. The visible channel contains optics that can provide high-speed full aperture guiding, segment guiding, or Shack-Hartmann wavefront sensing feeding an EMCCD camera. In natural seeing operations, these probes feed the GMT active optics system. In ground layer AO mode, they are the primary wavefront sensors. The second channel, used for phasing the seven segments in diffraction limited operation, contains J-band dispersed fringe sensor optics feeding a SAPHIRA IR e-APD array. We present the system architecture, and an overview of requirements, optical, mechanical and electrical designs.

Paper Details

Date Published: 6 July 2018
PDF: 16 pages
Proc. SPIE 10700, Ground-based and Airborne Telescopes VII, 107001T (6 July 2018); doi: 10.1117/12.2313589
Show Author Affiliations
Brian McLeod, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel Catropa, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel Durusky, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jan Kansky, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Derek Kopon, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Kenneth McCracken, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Stuart McMuldroch, Harvard-Smithsonian Ctr. for Astrophysics (United States)
William Podgorski, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Antonin Bouchez, GMTO Corp. (United States)


Published in SPIE Proceedings Vol. 10700:
Ground-based and Airborne Telescopes VII
Heather K. Marshall; Jason Spyromilio, Editor(s)

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