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Proceedings Paper

The hunt for 100% sky coverage
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Paper Abstract

Tomographic AO (or Wide Field AO) systems use LGS to build a 3D model of turbulence, but rely on NGS for low order sensing. .To preserve reasonable sky coverage, each photon coming from the NGS to sense Tip Tilt has to be optimally exploited. That means a smart control law, a low detection noise, a concentration of the photons onto a small patch and a wave front sensor concept with favorable noise propagation. In this paper, we describe the system choices that were made during the E-ELT laser tomographic system ATLAS phase A study, in order to get a sky coverage as close as possible to 100%. A correct estimation of the sky coverage is therefore a key issue. We have developped a sky coverage estimation strategy based on a Besan¸con model starfield generation, a star(s) selection tool, and a careful estimation of the residual anisoplanatism (after reconstruction process between the NGSs), noise and temporal contributors. We describe the details of the procedure, and derive the ATLAS expected performance.

Paper Details

Date Published: 27 July 2010
PDF: 11 pages
Proc. SPIE 7736, Adaptive Optics Systems II, 77360Y (27 July 2010); doi: 10.1117/12.857256
Show Author Affiliations
Serge Meimon, ONERA (France)
Thierry Fusco, ONERA (France)
Yann Clenet, LESIA, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France)
Jean-Marc Conan, ONERA (France)
François Assémat, LESIA, CNRS, Observatoire de Paris à Meudon, Univ. Paris Diderot (France)
Vincent Michau, ONERA (France)

Published in SPIE Proceedings Vol. 7736:
Adaptive Optics Systems II
Brent L. Ellerbroek; Michael Hart; Norbert Hubin; Peter L. Wizinowich, Editor(s)

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