MAVIS: imager and spectrograph

Ellis, Simon; Horton, Anthony; Schwab, Christian; Chin, T.; Content, Robert; Fernando, Nuwanthika; Lorente, Nuria P. F.; McDermid, Richard M.; Mohanan, Mahesh; McGregor, Helen; Pember, Jacob; Robertson, David J.; Smedley, Scott; Saunders, Will; Waller, Lew; Zhelem, Ross; Zheng, Jessica; Kosmalski, Johan; Cresci, G.; Mendel, J. Trevor; Bianco, Andrea; Brodrick, David; Burgess, Jennifer A.; Haynes, Dionne; Greggio, Davide; Rigaut, François; Zanutta, Alessio

doi:10.1117/12.2629238

Cited by 4 publications

(1 citation statement)

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“…The system includes four main opto-mechanical sub-systems. The Adaptive Optics Module (AOM) provides multi-conjugate adaptive optics (MCAO) correction in a 30" field of view (FoV) to the Imager and the Spectrograph sub-systems [3] . The former re-images a 30"x30" FoV, with a 7mas/pixel scale, in a number of broad and narrow band filters, while the latter provides integral field unit (IFU) spectroscopic capabilities, in which the FOV size, the spectral resolution (4000<R<12000) and the waveband range (370-100nm) combine differently in four spectroscopic modes.…”

Section: Introductionmentioning

confidence: 99%

MAVIS: preliminary design of the adaptive optics module

Viotto

Pinna

Agapito

et al. 2022

Adaptive Optics Systems VIII

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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 ( 8LGSs + 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.

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Section: Introductionmentioning

confidence: 99%