The Giant Magellan Telescope Natural Guidestar Adaptive Optics mode: improving the robustness of segment piston control

Date Issued
2022
Author(s)
Quirós-Pacheco, Fernando
•
van Dam, Marcos
•
Bouchez, Antonin H.
•
Conan, Rodolphe
•
Haffert, Sebastiaan Y.
•
•
Demers, Richard
DOI
Abstract
The Natural Guidestar Adaptive Optics (NGAO) system of the Giant Magellan Telescope (GMT) uses a visible-light modulated pyramid wavefront sensor (PWFS) to measure the wavefront aberrations, including residual segment piston errors. This paper presents an updated wavefront sensing and control architecture that increases the robustness of segment piston control. In the first place, the Natural Guide star Wavefront Sensor (NGWS) design has been updated to incorporate the recently proposed Holographic Dispersed Fringe Sensor (HDFS) as a second wavefront sensing channel measuring unambiguously differential segment piston errors as large as ~14 microns. In the second place, an optimized modal control strategy has been developed to compensate mode-by-mode for the optical gain of the PWFS. We report on the simulated NGAO performance results obtained when using a R=12 guide star, and with a turbulence strength of r0 =12.8 cm.
Coverage
Adaptive Optics Systems VIII
All editors
Schreiber, Laura; Schmidt, Dirk; Vernet, Elise
Series
Volume
12185
Start page
43
Conferenece
Adaptive Optics Systems VIII
Conferenece place
Montréal, Québec, Canada
Conferenece date
17-23 July, 2022
Uri
Url
Rights
open.access
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