MAVIS: performance estimation of the adaptive optics module

Agapito, Guido; Vassallo, Daniele; Plantet, Cédric; Cranney, Jesse; Zhang, Hao; Viotto, Valentina; Pinna, Enrico; Rigaut, François

doi:10.1117/12.2629363

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“…Two post-focal deformable mirrors (DM) will close the MCAO loop together with the AOF deformable secondary mirror (DSM), resulting in a suite of about 5000 actuators. The complete list of parameters and simulations sensitivity analyses, performed to optimize the system during Phase A, is reported in [8], while the current design performance evaluation is presented in [9].…”

Section: Main Ao Parametersmentioning

confidence: 99%

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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: Main Ao Parametersmentioning

confidence: 99%

“…This includes the results of simulations (again, see [9]), assuming consistent AO design parameters, as the main contributors, but also other terms:…”

Section: Wavefront Error Budgetmentioning

confidence: 99%