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27 July 2016 Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO
Noah Schwartz, Jean-François Sauvage, Carlos Correia, Benoît Neichel, Léonardo Blanco, Thierry Fusco, Arlette Pécontal-Rousset, Aurélien Jarno, Laure Piqueras, Kjetil Dohlen, Kacem El Hadi, Niranjan Thatte, Ian Bryson, Fraser Clarke, Hermine Schnetler
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Proceedings Volume 9909, Adaptive Optics Systems V; 990978 (2016) https://doi.org/10.1117/12.2231291
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom
Abstract
HARMONI is a visible and near-infrared integral field spectrograph designed to be a first-light instrument on the European extremely large telescope. It will use both single-conjugate and laser tomographic adaptive optics to fully exploit high-performance and sky coverage. Using a fast AO modelling toolbox, we simulate anisoplanatism effects on the point spread function of the single-conjugate adaptive optics of HARMONI. We investigate the degradation of the correction performance with respect to the off-axis distance in terms of Strehl ratio and ensquared energy. In addition, we analyse what impact the natural guide source magnitude, AO sampling frequency and number of sub-apertures have on performance.

We show, in addition to the expected PSF degradation with the field direction, that the PSF retains a coherent core even at large off-axis distances. We demonstrated the large performance improvement of fine tuning the sampling frequency for dimer natural guide stars and an improvement of approx. 50% in SR can be reached above the nominal case. We show that using a smaller AO system with only 20x20 sub-apertures it is possible to further increase performance and maintain equivalent performance even for large off-axis angles.
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Noah Schwartz, Noah Schwartz, Jean-François Sauvage, Jean-François Sauvage, Carlos Correia, Carlos Correia, Benoît Neichel, Benoît Neichel, Léonardo Blanco, Léonardo Blanco, Thierry Fusco, Thierry Fusco, Arlette Pécontal-Rousset, Arlette Pécontal-Rousset, Aurélien Jarno, Aurélien Jarno, Laure Piqueras, Laure Piqueras, Kjetil Dohlen, Kjetil Dohlen, Kacem El Hadi, Kacem El Hadi, Niranjan Thatte, Niranjan Thatte, Ian Bryson, Ian Bryson, Fraser Clarke, Fraser Clarke, Hermine Schnetler, Hermine Schnetler, "Preparation of AO-related observations and post-processing recipes for E-ELT HARMONI-SCAO", Proc. SPIE 9909, Adaptive Optics Systems V, 990978 (27 July 2016); doi: 10.1117/12.2231291; https://doi.org/10.1117/12.2231291
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