ECRH beam broadening in the edge turbulent plasma of fusion machines

摘要

Two analytical models for the ordinary mode propagating through inhomogeneousedge plasma layer are developed. Simple analytical expressions fordiffusion-like angular and spatial beam width variation are obtained andcompared to time-averaged results coming from 2D Maxwell's equations solver fordifferent turbulence k-spectra and plasma conditions. The strong spatialbroadening of microwave beam is predicted by the two approaches at realisticturbulent edge parameters for ECRH experiments at ITER.