  This paper introduces an experimental apparatus, which drives turbulence
electrically in a liquid metal pervaded by a high magnetic field. Unlike past
magnetohydrodynamic (MHD) setups involving a shallow confinement, the
experiment presented here drives turbulence whose dimensionality can be set
anywhere between three-dimensional and quasi two-dimensional. In particular, we
show that the dimensionality and componentality of the turbulence thus
generated are in fact completely fixed by the single parameter lz(li)/h, which
quantifies the competition between the solenoidal component of the Lorentz
force and inertia acting on a turbulent structure of the size of the forcing
scale li. This parameter is fully tunable thanks to the three operating
settings at hand: the injection scale, the intensity of the electric forcing
and the magnitude of the magnetic field. Thanks to the very high number of
measuring probes and fast acquisition rate implemented in this experiment, it
is possible to reliably measure the finest features of the inertial range on a
scale-wise basis.
