Full characterization of the turbulence generator MAPS for MCAO

Johann Kolb; Sylvain Oberti; Enrico Marchetti; Fernando Quirós-Pacheco

doi:10.1117/12.670832

27 June 2006 Full characterization of the turbulence generator MAPS for MCAO

Johann Kolb, Sylvain Oberti, Enrico Marchetti, Fernando Quirós-Pacheco

Proceedings Volume 6272, Advances in Adaptive Optics II; 627258 (2006) https://doi.org/10.1117/12.670832
Event: SPIE Astronomical Telescopes + Instrumentation, 2006, Orlando, Florida , United States

Abstract

In the framework of the MCAO Demonstrator MAD, ESO has developed a turbulence generator called MAPS to emulate a 3D evolving Paranal atmosphere. An all-optical solution has been chosen to produce the turbulence: a set of rotating refractive Phase Screens in which are imprinted patterns distorting the WF as the atmosphere would. In order to characterize the turbulence produced by MAPS, we have used several independent techniques (static WF measurements, long-exposure PSF, AO closed loop voltages) from the WF sensing wavelengths to the near-IR imaging ones. Such a characterization is essential to a further comparison between the lab results and the future on-sky measurements. This analysis required to study the link between the different parameters generally used to quantify the turbulence, in particular the Fried parameter r₀, the seeing and the FWHM of long-exposure images. The conclusions are that the outer scale L₀ has a preponderant influence on those values. This study will be completed by future on-sky measurements allowing to establish how realistic is the turbulence produced by the Phase Screens in MAPS.

Citation Download Citation

Johann Kolb, Sylvain Oberti, Enrico Marchetti, and Fernando Quirós-Pacheco "Full characterization of the turbulence generator MAPS for MCAO", Proc. SPIE 6272, Advances in Adaptive Optics II, 627258 (27 June 2006); https://doi.org/10.1117/12.670832

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