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The Multiconjugate Adaptive optics Demonstrator (MAD) has successfullydemonstrated on sky both Star Oriented (SO) and Layer Oriented (LO)multiconjugate adaptive optics techniques. While SO has been realized using 3Shack-Hartmann wavefront sensors (WFS), we designed a multi-pyramid WFS for theLO. The MAD bench accommodates both WFSs and a selecting mirror allows choosingwhich sensor to use. In the LO approach up to 8 pyramids can be placed on asmany reference stars and their light is co-added optically on two differentCCDs conjugated at ground and to an high layer. In this paper we discuss LOcommissioning phase and on sky operations.

Layer Oriented Wavefront sensor for MAD on Sky operations