Mode Conversion of the Fast Magnetosonic Wave in a Deuterium-Hydrogen Tokamak Plasma

Abstract

Mode conversion from the fast magnetosonic wave to a slow wave near the two-ion hybrid resonance is shown to explain recent experimental fast-wave damping results. A model for tunneling and mode conversion of the fast wave in the two-ion resonance zone incorporating ${k}_{\ensuremath{\parallel}}$ and plasma-density and magnetic-field profiles is used to explain the observations. The strong dependence of the absorption on ${k}_{\ensuremath{\parallel}}$ and the species concentration which is obtained has important consequences for major plasma-heating programs which are planned for tokamaks.