Plasma vortexes induced by an external rotating helical magnetic perturbation in tokamaks

The occurrence of two or four vortexes per one poloidal perturbation period has been found near the resonant surface as a plasma motion response on the penetration of an external low frequency helical magnetic perturbation in tokamaks. The investigation is carried out on the basis of the two-fluid MHD equations in the linear approximation for the cylindrical model.