Abstract
Ion heating by the explosive instability in an ion beam–plasma system is studied theoretically. Two electrostatic waves with negative and positive energies become simultaneously unstable by nonlinear wave–particle interaction (nonlinear Landau damping) with plasma ions accompanying ion heating. The relaxation of the ion beam makes the explosion time of the waves much larger and causes saturation of the ion heating. It is shown quantitatively that the decrement of beam energy is transferred into thermal energies of plasma and beam ions by this explosive instability.
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