NGWS-P: the natural guide star wavefront sensor prototype of GMT single conjugate AO system NGAO

Cédric Plantet; Anne-Laure Cheffot; Enrico Pinna; Simone Esposito; Nicolò Azzaroli; Fabio Rossi; Marco Bonaglia; Tommaso Lapucci; Luca Carbonaro; Fernando Quirós-Pacheco; Breann Sitarski; Patricio Schurter; Marcos van Dam; Antonin Bouchez; Richard Demers

doi:10.1117/12.2630864

29 August 2022 NGWS-P: the natural guide star wavefront sensor prototype of GMT single conjugate AO system NGAO

Cédric Plantet, Anne-Laure Cheffot, Enrico Pinna, Simone Esposito, Nicolò Azzaroli, Fabio Rossi, Marco Bonaglia, Tommaso Lapucci, Luca Carbonaro, Fernando Quirós-Pacheco, Breann Sitarski, Patricio Schurter, Marcos van Dam, Antonin Bouchez, Richard Demers

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Proceedings Volume 12185, Adaptive Optics Systems VIII; 121854H (2022) https://doi.org/10.1117/12.2630864
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

The Giant Magellan Telescope (GMT) Adaptive Optics (AO) systems feature a single conjugate natural guide star based AO system using the 7 deformable secondaries and a post focal wavefront sensor named NGWS (Natural Guide star Wavefront Sensor). The NGWS has two different channels: one featuring a high spatial sampling pyramid sensor dedicated to the fast frame rate correction of atmospheric turbulence and a second dedicated to the correct phasing of the 7 segments of the GMT telescope. The Arcetri AO group in collaboration with the GMT Organization (GMTO) and the University of Arizona (UA) is in charge of providing the design, fabrication and test of a prototype of the NGWS system that shall replicate all aspects of optical sensitivity including optical design, camera selection and data reduction. The prototype design starts from the baseline design for the NGWS that was provided by the Arcetri group in 2013. The prototype project Kick-off Meeting was held on April 16th 2021 and is foreseen to reach completion 34 months later. A first set of performance tests will be performed locally in Arcetri and the final prototype performance verification will happen at UA laboratories after installation of the unit on the High Contrast AO test bench developed by the AO group of UA. This final verification is scheduled for the summer of 2023. The paper reports about the prototype development work summarizing results of numerical simulation that lead to the chosen opto-mechanical design, main features and challenges of optical design for the two sensing channels.

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Cédric Plantet, Anne-Laure Cheffot, Enrico Pinna, Simone Esposito, Nicolò Azzaroli, Fabio Rossi, Marco Bonaglia, Tommaso Lapucci, Luca Carbonaro, Fernando Quirós-Pacheco, Breann Sitarski, Patricio Schurter, Marcos van Dam, Antonin Bouchez, and Richard Demers "NGWS-P: the natural guide star wavefront sensor prototype of GMT single conjugate AO system NGAO", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121854H (29 August 2022); https://doi.org/10.1117/12.2630864

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KEYWORDS

Sensors

Adaptive optics

Prototyping

Wavefront sensors

Stars

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