Reverse of Tokamak Plasma Rotation under Tearing-Mode Locking by External Resonant Magnetic Perturbation

摘要

. Rotation of tokamak plasma attracts considerable attention in the fusion research because this rotation, particularly shear of rotation velocity, affects plasma stability and confinement. The plasma rotation velocity in the vicinity of a rational magnetic surface can be influenced by the development of the tearing mode. According to experiments and numerical modelling, the tearing-mode locking by externally applied nonrotating Resonant Magnetic Perturbation (RMP) with the same helicity can be followed by a rotation reversal of the Resonant Plasma Layer (RPL) occupied by magnetic island structure (see [1, 2]). Results of calculations and analysis of the plasma rotation reversal subject to the tearing mode locking are presented in this paper. The main attention is paid to conditions providing the rotation reversals separately in toroidal and poloidal directions, as well as the concurrent changes of both rotation directions.