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Dealing with spiders on ELTs: using a Pyramid WFS to overcome residual piston effects
Author(s): Andreas Obereder; Stefan Raffetseder; Victoria Hutterer; Iuliia Shatokhina
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Paper Abstract

In the design of the future generation ELTs the support structures for the secondary mirror (also known as spiders) lead to a piston on each of the pupil segments created by the spiders, known as ”island effect”. In this talk we focus on fast and stable reconstruction methods to cope with the island effect. We present and compare wavefront reconstruction algorithms and highlight their performance in a METIS- like AO system. We focus on FEWHA (Finite Element-Wavelet Hybrid Algorithm), Poke Matrix Inversion using a set of predefined DM influence functions and new methods for a direct segment piston estimation in combination with the P-CuReD (Preprocessed Cumulative Reconstructor with Domain decomposition). The results are backed up by Octopus (the full AO end-to-end simulator from ESO) simulations highlighting stable Strehl ratios for our simulation setting.

Paper Details

Date Published: 10 July 2018
PDF: 19 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 107031D (10 July 2018); doi: 10.1117/12.2313419
Show Author Affiliations
Andreas Obereder, Johann Radon Institute for Computational and Applied Mathematics (Austria)
Stefan Raffetseder, Johann Radon Institute for Computational and Applied Mathematics (Austria)
Victoria Hutterer, Johannes Kepler Univ. Linz (Austria)
Iuliia Shatokhina, Johannes Kepler Univ. Linz (Austria)

Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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