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HARMONI is a visible and NIR integral field spectrograph, providing theE-ELT's core spectroscopic capability at first light. HARMONI will work at thediffraction limit of the E-ELT, thanks to a Classical and a Laser TomographicAO system. In this paper, we present the system choices that have been made forthese SCAO and LTAO modules. In particular, we describe the strategy developedfor the different Wave-Front Sensors: pyramid for SCAO, the LGSWFS concept, theNGSWFS path, and the truth sensor capabilities. We present first potentialimplementations. And we asses the first system performance.

The adaptive optics modes for HARMONI: from Classical to Laser Assisted Tomographic AO