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VOLUME 58 (1993) | ISSUE 7 | PAGE 516
Freezing in of a magnetic field in a kinetic description of a collisionless plasma
The reason for the freezing in of a magnetic field and the reasons for the disruption of this effect in a collisionless plasma are analyzed. The concept of a "freezing-in preserver" is introduced. In a tokamak, the role of this preserver may be played by untrapped electrons, which are not at resonance with turbulence and which thus execute an integrable motion. As a result, the poloidal magnetic field is frozen in the toroidal field. Under these conditions the diffusion of particles and heat may be governed by turbulence, in agreement with experiment.