Abstract
A slab model is developed to study the excitation of lower hybrid instability triggered by the injection of a transverse neutral beam in a tokamak with magnetic shear. The lower hybrid mode is evanescent in the inner and outer region while propagating waves in the intermediate region. The neutral beam, on getting fully ionized in the plasma, resonantly couples with the lower hybrid wave in the intermediate region, driving the mode unstable. The theory of this process reveals that the growth rate scales as one third power of beam density, and increases significantly with the sheared magnetic field due to modification in the parallel wave number and the mode structure.
Published Version
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