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Future high-contrast imagers on ground-based extremely large telescopes willhave to deal with the segmentation of the primary mirrors. Residual phaseerrors coming from the phase steps at the edges of the segments will have to beminimized in order to reach the highest possible wavefront correction and thusthe best contrast performance. To study these effects, we have developed theMITHIC high-contrast testbed, which is designed to test various strategies forwavefront sensing, including the Zernike sensor for Extremely accuratemeasurements of Low-level Differential Aberrations (ZELDA) and COronagraphicFocal-plane wave-Front Estimation for Exoplanet detection (COFFEE). We recentlyequipped the bench with a new atmospheric turbulence simulation module thatoffers both static phase patterns representing segmented primary mirrors andcontinuous phase strips representing atmospheric turbulence filtered by an AOor an XAO system. We present a characterisation of the module using differentinstruments and wavefront sensors, and the first coronagraphic measurementsobtained on MITHIC.

Characterisation of a turbulent module for the MITHIC high-contrast imaging testbed