Simplified model(s) of the GRAVITY+ adaptive optics system(s) for performance prediction

Anthony Berdeu; Jean-Baptiste Le Bouquin; Guillaume Mella; Laurent Bourgès; Jean-Philippe Berger; Guillaume Bourdarot; Thibaut Paumard; Frank Eisenhauer; Christian Straubmeier; Paulo Garcia; Sebastian Hönig; Florentin Millour; Laura Kreidberg; Denis Defrère; Ferréol Soulez; Taro Shimizu

doi:10.1117/12.3019865

27 August 2024 Simplified model(s) of the GRAVITY+ adaptive optics system(s) for performance prediction

Anthony Berdeu, Jean-Baptiste Le Bouquin, Guillaume Mella, Laurent Bourgès, Jean-Philippe Berger, Guillaume Bourdarot, Thibaut Paumard, Frank Eisenhauer, Christian Straubmeier, Paulo Garcia, Sebastian Hönig, Florentin Millour, Laura Kreidberg, Denis Defrère, Ferréol Soulez, Taro Shimizu

Author Affiliations +

Proceedings Volume 13097, Adaptive Optics Systems IX; 130976G (2024) https://doi.org/10.1117/12.3019865
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

In the context of the GRAVITY+ upgrade, the adaptive optics (AO) systems of the GRAVITY interferometer are undergoing a major lifting. The current CILAS deformable mirrors (DM, 90 actuators) will be replaced by ALPAO kilo-DMs (43×43, 1432 actuators). On top of the already existing 9×9 Shack-Hartmann wavefront sensors (SH-WFS) for infrared (IR) natural guide star (NGS), new 40×40 SH-WFSs for visible (VIS) NGS will be deployed. Lasers will also be installed on the four units of the Very Large Telescope to provide a laser guide star (LGS) option with 30×30 SH-WFSs and with the choice to either use the 9×9 IR-WFSs or 2×2 VIS-WFSs for low order sensing. Thus, four modes will be available for the GRAVITY+ AO system (GPAO): IR-NGS, IR-LGS, VIS-NGS and VIS-LGS. To prepare the instrument commissioning and help the observers to plan their observations, a tool is needed to predict the performances of the different modes and for different observing conditions (NGS magnitude, science object magnitude, turbulence conditions...) We developed models based on a Maréchal approximation to predict the Strehl ratio of the four GPAO modes in order to feed the already existing tool that simulates the GRAVITY performances. Waiting for commissioning data, our model was validated and calibrated using the TIPTOP toolbox, a Point Spread Function simulator based on the computation of Power Spectrum Densities. In this work, we present our models of the NGS modes of GPAO and their calibration with TIPTOP.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Anthony Berdeu, Jean-Baptiste Le Bouquin, Guillaume Mella, Laurent Bourgès, Jean-Philippe Berger, Guillaume Bourdarot, Thibaut Paumard, Frank Eisenhauer, Christian Straubmeier, Paulo Garcia, Sebastian Hönig, Florentin Millour, Laura Kreidberg, Denis Defrère, Ferréol Soulez, and Taro Shimizu "Simplified model(s) of the GRAVITY+ adaptive optics system(s) for performance prediction", Proc. SPIE 13097, Adaptive Optics Systems IX, 130976G (27 August 2024); https://doi.org/10.1117/12.3019865

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