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Proceedings Paper

Modelling global multi-conjugated adaptive optics
Author(s): Valentina Viotto; Roberto Ragazzoni; Demetrio Magrin; Maria Bergomi; Marco Dima; Jacopo Farinato; Luca Marafatto; Davide Greggio
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Paper Abstract

The recently proposed concept of Global MCAO (GMCAO) aims to look for Natural Guide Stars in a very wide technical Field of View (FoV), to increase the overall sky coverage, and deals with the consequent depth of focus reduction introducing numerically a quite-high number of Virtual Deformable Mirrors (VDMs), which are then the starting point for an optimization of the real DMs shapes for the correction of the -smaller- scientific FoV. To translate the GMCAO concept into a real system, a number of parameters requires to be analyzed and optimized, like the number of references and VDMs to be used, the technical FoV size, the spatial samplings, the sensing wavelength. These and some other major choices, like the open loop WFSs concept and design, will then drive the requirements and the performance of the system (e.g. limiting magnitude, linear response, and sensitivity). This paper collects some major results of the on-going study on the feasibility of an Adaptive Optics system for the E-ELT, based on GMCAO, with a particular emphasis on the sky coverage issue. Besides the sensitivity analysis of the optimization of the already mentioned parameters, such a topic involves the implementation of an IDL code simulation tool to estimate the system performance in terms of Strehl Ratio in a 2×2 arcmin FoV, when a variable number of NGSs and VDMs are used. Different technical FoV diameters for the references selection and various constellations can be also compared. This study could be the starting point for a dedicated laboratory testing and, in the future, an on-sky experiment at an 8m telescope with a “scaled down” demonstrator.

Paper Details

Date Published: 4 August 2014
PDF: 8 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91486H (4 August 2014); doi: 10.1117/12.2055859
Show Author Affiliations
Valentina Viotto, INAF - Osservatorio Astronomico di Padova (Italy)
Roberto Ragazzoni, INAF - Osservatorio Astronomico di Padova (Italy)
Demetrio Magrin, INAF - Osservatorio Astronomico di Padova (Italy)
Maria Bergomi, INAF - Osservatorio Astronomico di Padova (Italy)
Marco Dima, INAF - Osservatorio Astronomico di Padova (Italy)
Jacopo Farinato, INAF - Osservatorio Astronomico di Padova (Italy)
Luca Marafatto, INAF - Osservatorio Astronomico di Padova (Italy)
Univ. degli Studi di Padova (Italy)
Davide Greggio, INAF - Osservatorio Astronomico di Padova (Italy)
Univ. degli Studi di Padova (Italy)

Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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