  The mode-converted ion-Bernstein wave excited in tokamaks is shown to exhibit
certain very interesting behavior, including the attainment of very small
poloidal phase velocities, the reversal of poloidal direction, and up-down
asymmetries in propagation and damping. Because of these effects, this wave
holds promise for channeling {$\alpha$-particle}\ power to ions, something that
would make a tokamak fusion reactor far more attractive than presently
envisioned.
