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A possible mechanism of the appearance of turbulent structures in plasma is considered as a result of the development of unstable ion temperature gradient (ITG) drift waves, both with and without a sheared flow. A description of several stages of the drift wave evolution is proposed. The condition for limiting the growth of the wave amplitude is discussed. A qualitative agreement of the results with the theoretical and experimental results of other authors is shown. The motion of particles in the wave and vortex structures is studied on the basis of the proposed mechanism and ideas of other authors.

The influence of the properties of the profile of a radial static electric field E(r) on the evolution of an unstable ion temperature–gradient (ITG) drift wave in a nonuniformly rotating plasma column in a magnetic field is studied. The effect of symmetry on the decrease in the level of turbulent fluctuations, which are associated with the limiting state of the ITG wave during its destruction, is discussed. The level of turbulence is estimated in the framework of approximation of finite amplitudes depending on the electric field structure. It is shown that the maximum decrease in the level of fluctuations occurs with a symmetrical configuration of the radial electric field.

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