AO4ELT5 Proceedings

The Multi-Conjugate AO system of the EST: DM height determination for best performance using real daytime statistical turbulence data

Montilla, Icíar (Instituto de Astrofísica de Canarias), Montoya, Luz María (Instituto de Astrofísica de Canarias)

The 4-meter diameter European Solar Telescope incorporates an innovative built-in Multi-Conjugate Adaptive Optics system to be able to measure the properties of the solar magnetic field with great accuracy and high spatial resolution. The MCAO system features 4 high altitude DM’s, and combines a narrow field high order wavefront sensor, providing the information to correct the ground layer, and a wide field lower order sensor to control the higher altitude mirrors. The wavefront sensing is performed using correlations on images of the Sun with a field of view of ~10”, averaging wavefront information from different sky directions, affecting the sensing and sampling of high altitude turbulence. We have determined the DM heights analyzing the performance of the EST MCAO system for a broad range of daytime turbulence profiles and telescope elevations, comparing the results of the static simulations of the Fractal Iterative Method combined with the analytical error budget, with the end to end simulations performed with DASP-solar. We present the results of our study which determines the DM heights that ensure best performance of the EST MCAO system.

DOI: 10.26698/AO4ELT5.0181- Proceeding PDF

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