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| VOLUME 58 (1993) | ISSUE 7 |
PAGE 516
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Freezing in of a magnetic field in a kinetic description of a collisionless plasma
Yan'kov V. V.
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.
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![](/ps/1190/article_17963_800_head.png "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.")