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Nonlinear development of the current-driven ion wave instability

An evolution of the current-driven ion wave instability is investigated experimentally. The linear properties of the instability are confirmed. The nonlinear evolution of the instability is studied. When the ratio of electron drift velocity to thermal velocity, v d / v e ≃0.1, which is measured directly by the rotatable Langmuir probe, the turbulent power spectrum has a peak in the vicinity of ν i-n and decreases monotonically as ω -4.2±0.4 with ω. From the scattering of the probing ion beam, it is found that the charged particles are resonantly scattered by the ion wave turbulence. The experimental results are compared with those from the perturbed orbit theory.