One-dimensional model of the instability of external kink modes caused by the resistivity of the conducting wall in tokamaks

The growth rates and boundaries of the instability of external kink modes caused by the resistivity of the conducting wall in tokamaks are calculated numerically by using the one-dimensional model developed in [6]. The nonlocal interaction between the fundamental poloidal harmonic of the perturbation and singular satellite harmonics is shown to be the principal reason for the onset of this instability. Agreement between the threshold for this instability and the Troyon threshold is discussed.