HIGH-FREQUENCY INSTABILITIES AND TRANSPORT PROCESSES IN THE T-10 TOKAMAK

This work is based on the T-10 observations of high frequency oscillat ions with frequencies larger then ion cyclotron frequency and waveleng th of the order of Debye's radius. The nature of the oscillations and their role in anomalous transport is analyzed. It is shown that the ch ange of the electric field polarization with increasing magnetic field is the experimental evidence of a transition from instability with un magnetized ions to instability with magnetized ones. For the analysis of instabilities, a new wide-range approximation of modified Bessel fu nctions in terms of elementary functions is obtained. The linear consi deration of this problem and the theoretically obtained diffusion coef ficients are in satisfactory agreement with the experimental data from the T-10 facility, including the correct isotope effect.