Abstract
The ion cyclotron drift wave (ICDW), which is the mode coupled between the electrostatic ion cyclotron wave and the drift wave, was investigated by experiments and calculations. The calculated dispersion relations for the m=1 mode show that the mode coupling becomes stronger with increasing |κ| (where κ=dn/dr/n) and a resonance aroud the ion cyclotron frequency changes to a cutoff when |κ| exceeds the azimuthal wave number ky. A simple method to control the radial density distribution is proposed and is confirmed to be varied to a considerable extent. Ion cyclotron drift waves for the m=1, m=-1 and m=2 modes have been excited externally with controlled values of |κ|. The measured dispersion relations agree with the theoretical predictions.
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