@inproceedings{1fc8df0052f4475684657127a3d4b554,
title = "On the sequence of deformable mirrors in MCAO: Findings from an on-sky, closed-loop experiment",
abstract = "We performed an on-sky MCAO experiment using 4 deformable mirrors (DMs) to analyze the relevance of their sequence to the residual wavefront error. Two DMs were conjugate to 4 and 8 km. The other two DMs were placed in pupil images upstream and downstream of the 4-km and 8-km mirrors. At any time, both high altitude DMs were active but only one pupil DM was active while the other one stayed flat. Firstly, we found that the MCAO control loops using either pupil DM were stable and robust. Dynamic misregistration, which was present for the first pupil DM, was not an immediate problem for the controller. We did not notice an apparent difference when repeatedly switching between the pupil DMs during the operation. A closer analysis of the contrast in the corrected images and AO telemetry indicates an advantage when the pupil correction was applied with the DM that was downstream of the high-altitude DMs. This finding is consistent in several data recorded at different days. The difference, however, is small. A more detailed analysis is probably needed to rule out error sources potentially not considered herein to draw a final conclusion on the optimal sequence of DMs in MCAO and its practical relevance.",
keywords = "Clear, Dynamic misregistration, Multi-conjugate adaptive optics, Sequence of deformable mirrors",
author = "Dirk Schmidt and Nicolas Gorceix and Philip Goode",
note = "Funding Information: A number of people have contributed in various form to this observing run. We would particularly like to name and thank J. Nenow, E. Norro, C. Plymate, S. Shumko, and J. Varsik (all BBSO). This research was sponsored by the U.S. National Science Foundation under the grant NSF-AST-1907364. Any opinions, findings and conclusions or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. The Big Bear Solar Observatory and its Goode Solar Telescope are facilities of the New Jersey Institute of Technology. Publisher Copyright: {\textcopyright} 2020 SPIE.; Adaptive Optics Systems VII 2020 ; Conference date: 14-12-2020 Through 22-12-2020",
year = "2020",
doi = "10.1117/12.2563376",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Laura Schreiber and Dirk Schmidt and Elise Vernet",
booktitle = "Adaptive Optics Systems VII",
address = "United States",
}