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Proceedings Paper

MAPS: a turbulence simulator for MCAO
Author(s): Johann Kolb; Enrico Marchetti; Stephane Tisserand; Francis Franza; Bernhard Delabre; Frederic Gonte; Roland Brast; Sophie Jacob; Fabien Reversat
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Paper Abstract

The Multi-Atmospheric Phase screens and Stars (MAPS) instrument is a powerful tool that has been developed in the framework of the ESO Multi-conjugate Adaptive optics Demonstrator project (MAD). It allows emulating a 3D evolving Paranal-like atmosphere as well as up to 12 sources in a 2 arc minutes field of view, as seen at a Nasmyth focus of one of the VLT. It will be used to perform advanced laboratory tests on MAD before its shipment to Chile. In this paper we present the opto-mechanical design of MAPS. This one simulates the characteristics of the VLT focus and achieves a high Strehl Ratio over the whole Field of View in the visible as well as in the infrared. A curved entrance plate crowded with fibers emulates various stars configurations including real sky asterisms. In order to simulate the atmosphere, three rotating Phase Screens are placed in the beam and conjugated with different altitudes. Those are glass plates dig in their surface in a way that the beam passing through is distorted as it would be by an atmospheric turbulent layer. In this poster we also present the process of research that lead to the choice of a reliable technique to imprint the aberrations into the screens, their properties and expected performance.

Paper Details

Date Published: 25 October 2004
PDF: 11 pages
Proc. SPIE 5490, Advancements in Adaptive Optics, (25 October 2004); doi: 10.1117/12.551478
Show Author Affiliations
Johann Kolb, European Southern Observatory (Germany)
Enrico Marchetti, European Southern Observatory (Germany)
Stephane Tisserand, SILIOS Technologies (France)
Francis Franza, European Southern Observatory (Germany)
Bernhard Delabre, European Southern Observatory (Germany)
Frederic Gonte, European Southern Observatory (Germany)
Roland Brast, European Southern Observatory (Germany)
Sophie Jacob, SILIOS Technologies (France)
Fabien Reversat, SILIOS Technologies (France)


Published in SPIE Proceedings Vol. 5490:
Advancements in Adaptive Optics
Domenico Bonaccini Calia; Brent L. Ellerbroek; Roberto Ragazzoni, Editor(s)

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