Effect of Anisotropy on the Ion-Temperature-Gradient Instability

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Abstract
It is shown that anisotropy in gradient has a substantial effect on the ion-temperature-gradient-driven mode. A gradient in the parallel temperature is needed for an instability to occur, and a gradient in the perpendicular temperature can either enhance or diminish the instability. The latter may be the basis for a stabilization scheme for this mode in tokamaks via strong and appropriate ion-cyclotron-resonance heating. The physical reason for this important role difference is also presented.