The two first light adaptive optics (AO) instruments for the European Extremely Large Telescope (E-ELT) will
both rely on several Sodium Laser Guide Stars (LGS). In using this technology, the E-ELT diameter comes with
new challenges mainly raised by spot elongation. Before the final design studies of the E-ELT instruments, a
Sodium LGS wavefront sensing (WFS) on-sky experiment at this scale is mandatory to provide meaningful spatial
and temporal measurement error and performance evaluation. For this purpose, we propose to use CANARY,
the Multi-Object AO demonstrator installed at the WHT (4.2m). CANARY is now undergoing a Rayleigh
LGS upgrade and also provides natural guide star WFS. It could easily be adapted to the Sodium LGS case.
Additionally, a transportable laser system, such as the one developed at ESO, positioned at a varying distance
from the WHT could be used to provide off-axis launching (up to 40m), simulating the whole range of spot
elongations that will be obtained on the E-ELT. Full scale simulations of a Sodium LGS WFS on the E-ELT
have guided us in the definition of the experiment we are proposing. Previous simulation results in the literature
have stressed that an estimate of the Sodium profile is necessary to reduce measurement error to an affordable
level. Hence parallel Sodium profiling is mandatory in the proposed experiment. In this paper, we present the
simulation results as well as the specifications for both the Sodium LGS WFS and profiler to be used on Canary.