Electron cyclotron emission from tokamak plasmas with mildly superthermal electrons

The emission of cyclotron radiation from a tokamak plasma in the presence of a high toroidal current is investigated. For the fundamental frequency, a theory of the radiation which consistently includes the hot plasma polarization effects is developed. The high current density electron system is described by a distribution function which is the sum of two Maxwellian functions representing the body of the electron population and a small fraction of superthermal drifting electrons, respectively. The emission of the ordinary and extraordinary modes in the equatorial plane of the torus for quasi-perpendicular propagation is investigated numerically. It is found that the radiation temperature deduced from the emission of radiation on the high B/sub t/ side of the torus differs from that on the low B/sub t/ side, where B/sub t/ is the confining magnetic field