[en] During the previous contract year three investigations were completed. The effect of lower hybrid heating on drift modes has been studied, and it was found that lower hybrid heating can modify the drift wave spectrum. We have investigated the coupling of unstable drift waves by a process akin to nonlinear Landau damping, and found that the drift wave spectrum tends toward isotropy in the plane perpendicular to the magnetic field, in agreement with experiments. Finally it was shown that the purely growing drift mode is stabilized by magnetic shear in Tokomak devices