Linear and nonlinear interactions of microwave radiation near the electron cyclotron frequency in plasmas

The interactions of microwave near the electron cyclotron frequency with plasmas are investigated by linear wave-particle and nonlinear wave-wave interaction theories for tokamaks and the Elmo Bumpy Torus (EBT). The radial energy distribution of electron cyclotron heating in tokamaks is considered. The fine structure of cyclotron resonance is investigated from damping of electromagnetic waves. The spatial shape factor is obtained from a general heating model in tokamaks, which removes singularities at the magnetic axis and the tangency point of the mod-B surface. The ORNL 1-D Transport Code is used to find the temporal and spatial behaviors of plasma parameters with electron cyclotron heating on the ISX tokamak. The profile modification will depend on the response of impurities to heating. A new ω-contour method for dispersion relation of electrostatic waves is introduced in order to find threshold values of parametric decay instabilities near the upper hybrid frequency