MAVIS: preliminary design of the adaptive optics module

Date Issued
2022
Author(s)
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Beltramo-Martin, Olivier
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Cranney, Jesse
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Galla, Antony
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Gausachs, Gaston
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Gratadour, Damien
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Haguenauer, Pierre
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Herrald, Nick
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Ströbele, Stefan
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Taylor, Brian
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Vaccarella, Annino
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Brodrick, David
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Burgess, Jennifer
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Rigaut, François
DOI
Abstract
MAVIS will be part of the next generation of VLT instrumentation and it will include a visible imager and a spectrograph, both fed by a common Adaptive Optics Module. The AOM consists in a MCAO system, whose challenge is to provide a 30" AO-corrected FoV in the visible domain, with good performance in a 50% sky coverage at the Galactic Pole. To reach the required performance, the current AOM scheme includes the use of up to 11 reference sources at the same time (8 LGSs + 3 NGSs) to drive more than 5000 actuators, divided into 3 deformable mirrors (one of them being UT4 secondary mirror). The system also includes some auxiliary loops, that are meant to compensate for internal instabilities (including WFSs focus signal, LGS tip-tilt signal and pupil position) so to push the stability of the main AO loop and the overall performance. Here we present the Preliminary Design of the AOM, which evolved, since the previous phase, as the result of further trade-offs and optimizations. We also introduce the main calibration strategy for the loops and sub-systems, including NCPA calibration approach. Finally, we present a summary of the main results of the performance and stability analyses performed for the current design phase, in order to show compliance to the performance requirements....
Coverage
Adaptive Optics Systems VIII
All editors
Schreiber, Laura; Schmidt, Dirk; Vernet, Elise
Series
Volume
12185
Start page
72
Conferenece
Adaptive Optics Systems VIII
Conferenece place
Montréal, Québec, Canada
Conferenece date
17-23 July, 2022
Uri
Url
Issn Identifier
0277-786X
Ads BibCode
2022SPIE12185E..20V
Rights
open.access
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