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29 August 2022 HARMONI at ELT: impact of low wind effect on SCAO mode performance
Jean François Sauvage, Charlotte Bond, Thierry Fusco, Benoit Neichel, Noah Schwartz, Carlos Correia, Vincent Chambouleyron, Nicolas Levraud, Kjetil Dohlen, Kacem El Hadi, Mahawa Cisse, Niranjan Thatte, Fraser Clarke, David Le Mignant, Jérôme Amiaux
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Proceedings Volume 12185, Adaptive Optics Systems VIII; 1218519 (2022) https://doi.org/10.1117/12.2627698
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada
Abstract
The Extremely Large Telescope [ELT] is the future large European optical observatory. It will offer to astronomical community a unique high angular resolution of 12 mas in K band. The diffraction limit on such a telescope can only be met by using adaptive optics systems in order to compensate for the atmospheric perturbations as well as the telescope and instrument aberrations. The large spiders (50cm width) of the telescope are the source of strong wave-front fragmentation that prevent from reaching the diffraction limit. Among them, the low wind effect is a large expected wave-front discontinuity brought by the temperature gradient around the spiders. In this paper, we analyse the expected impact of such an aberration on the performance of the AO system, in the case of a first generation SCAO system on ELT. We also analyse its impact on the AO WFS. Lastly, we explore possible solution for HARMONI-SCAO and analyse their potential performance.
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Jean François Sauvage, Charlotte Bond, Thierry Fusco, Benoit Neichel, Noah Schwartz, Carlos Correia, Vincent Chambouleyron, Nicolas Levraud, Kjetil Dohlen, Kacem El Hadi, Mahawa Cisse, Niranjan Thatte, Fraser Clarke, David Le Mignant, and Jérôme Amiaux "HARMONI at ELT: impact of low wind effect on SCAO mode performance", Proc. SPIE 12185, Adaptive Optics Systems VIII, 1218519 (29 August 2022); https://doi.org/10.1117/12.2627698
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KEYWORDS
Adaptive optics
Telescopes
Diffraction
Mirrors
Photons
Point spread functions
Spatial resolution
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