  The Ingot WFS, a Pyramid-like WFS, has been proposed as a relief to the LGS
spot elongation. Actually, the artificial sources are confined in an excited
cigar-shaped region in the sodium layer and portions of the telescope aperture
have a corresponding different perspective. This diversity generates a
variation of the WFS response depending on the illuminated sub-aperture
position. The feasibility study of the INGOT WFS is developing within the MAORY
project. In this work we present the numerical simulator built in order to
investigate the performance of the IngotWFS in terms of Strehl Ratio, obtained
reconstructing the incoming turbulent wavefront with a modal approach, in a
closed-loop fashion. We also discuss the assumptions and tests we made in order
to explore the range of parameters that play key roles in the game. Finally, we
report on the overall results of the simulations of the performance expected by
the Ingot WFS, under different conditions and input aberrations, with the aim
to also compare the measured AO loop residuals with the Shack-Hartmann WFS
ones, obtained working under the same assumptions.
