Abstract
Properties of Alfvén waves (AWs) are studied which were excited in ohmic plasma of the TUMAN-3M tokamak. By means of matching the AWs frequency calculated from electron density profile with the experimentally measured one, it was found that the waves are localized in the region of r/a < 0.5. The effect of the impurity carbon ions on AWs frequency has been studied. It has been experimentally confirmed that, in the case of fully ionized carbon ions, when mass-to-charge ratios are equal for both the dominant and impurity ions, the AWs frequency does not depend on the impurity density, and is determined by the plasma electron density and the mass of dominant ions.
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