Phasing the Segmented Giant Magellan Telescope: Progress in Testbeds and Prototypes

Richard Demers, Antonin Bouchez, Fernando Quiros-Pacheco, Patricio Schurter, Breann Sitarski, Marcos A. van Dam, Dan Catropa, Jan Kansky, Brian McLeod, Stuart McMuldroch, Bill Podgorski, Laird Close, Victor Gasho, Sebastiaan Haffert, Alex Hedglen, Maggie Kautz, Jared Males, Guido Agapito, Nicolò Azzaroli, Luca CarbonaroAnne Laure Cheffot, Simone Esposito, Tommaso Lapucci, Enrico Pinna, Cédric Plantet, Alfio Puglisi, Fabio Rossi, Guillermo Gonzalez, Bijan Nemati

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Scopus citations


One of the greatest technical challenges of the doubly-segmented Giant Magellan Telescope is the accurate and stable control of segment piston in the diffraction limited observation mode. To address this challenge, in collaboration with the University of Arizona, Smithsonian Astrophysical Observatory and the Istituto Nazionale di Astrofisica, GMTO is executing a project to optimize and validate segment piston control strategies and algorithms using a pair of testbeds. The testbeds provide disturbances to simulate atmospheric turbulence and differential atmospheric dispersion. In addition to the phasing demonstration, the testbeds offer the opportunity to validate hardware designs for the Acquisition & Guiding Wavefront Sensor (AGWS) and the Natural Guide Star Wavefront Sensor (NGWS) and to mitigate their fabrication and assembly risks. Significant progress is reported in the design of the AGWS and NGWS prototypes as well as preliminary test results from the testbeds.

Original languageEnglish (US)
Title of host publicationAdaptive Optics Systems VIII
EditorsLaura Schreiber, Dirk Schmidt, Elise Vernet
ISBN (Electronic)9781510653511
StatePublished - 2022
EventAdaptive Optics Systems VIII 2022 - Montreal, Canada
Duration: Jul 17 2022Jul 22 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceAdaptive Optics Systems VIII 2022


  • adaptive optics
  • diffraction limited imaging
  • Giant Magellan Telescope
  • segment phasing
  • segmented telescope
  • wavefront sensing

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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