Notes on Megneto-Hydrodynamic Equilibrium

An effect of rational surfaces in a stellarator was studied with varying rotational transform ratio. It can be shown that lines of current describe rapidly oscillating curves in the neighborhood of the rational surface. The diffusion velocity of fluids across magnetic lines increases due to the finite conductivity of fluids and the long paths of current lines in that region. A vontex flow may occur under some conditions. The dlffusion effect will be small In practical cases, according to this semiquantitative treatment. (B.O.G.)