WAVE-FIELD DISTRIBUTIONS FOR TOROIDAL PLASMAS WITH NEARLY CIRCULAR CROSS-SECTIONS

Solutions of the wave equation in a plasma with stochastic ray traject ories have been considered. In particular, we have studied the fast ma gnetosonic wave in the limit of weak damping. It is found that the oft en used assumption of a uniform wave energy density in the phase space for stochastic wave solutions does not hold, a conclusion which shoul d be valid not only for applications related to wave propagation in pl asmas. A wave-field model for stochastic fields has been obtained for tori with nearly circular cross sections.