ICRF '3-D' antenna coupling and fast ion heating models for fusion plasmas

Analysis and computer simulation is presented for investigating coupling of Ion Cyclotron Range of Frequency (ICRF) waves to tokamak plasmas using phased coil antenna arrays. The model accounts for 3-D antenna and feeder current effects, an antenna cavity which is finite in all three dimensions and warm plasma effects. The effect of the three-dimensional cavity on the parallel wavenumber spectrum of the coupled power is investigated. We also consider the problem of fundamental and second harmonic deuterium and fast tritium beam heating for ITER and TFTR plasmas in the presence of a population of fast alpha particles. A range of D/T ratios and deuterium tail temperatures are examined for ITER for a range of alpha particle concentrations. We find that the region near the two-ion D-T hybrid resonance can provide a substantial enhancement of the alpha particle absorbed power and wave reflection. We also describe second and higher harmonic heating of the deuterium, tritium and alpha particles for the case of the TFTR supershot. We find that a significant (>5%) alpha particle heating occurs for the second harmonic deuterium heating case. (author) 4 refs., 4 figs., 2 tabs