Excitement of Local Non-Uniformities in Plasma by Unstable Ion-Temperature-Gradient Waves

It is considered excitement of local non-uniformities in plasma by unstable ion-temperature-gradient (ITG) waves. New version of these processes based on the approach of finite wave amplitude is suggested. Some features of ITG-waves in this approximation are discussed. First of all qualitative distributions of values of plasma density fluctuations and temperature fluctuations perturbed by ITG-waves inside non-uniform plasma along minor tokamak radius are estimated. It is shown the obtained dependencies based on the suggested model qualitatively correspond to the experimental data.