Abstract
Discusses RF heating of three classes of Tokamak flux surfaces which intersect the electron cyclotron resonance heating region: rational-q, near rational-q and irrational-q. On irrational-q surfaces, the degree of heating is the same for all electrons. One and near rational-q surfaces, heating is localised to closed helical bands of electrons. These hot bands support local enhancements of current density, and act as current-carrying filaments within the plasma. The poloidal magnetic field associated with these currents has X-points. The use of ECRH as a current drive mechanism will enhance these effects, as will an increase in the size of Tokamak major radius.
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