Scattering of electromagnetic radiation by dust induced plasma fluctuations (generalized theory for dust diagnostics)

摘要

General theory electromagnetic wave scattering in dusty plasmas is developed. It is found thatdust grains change both the electron and ion fluctuations via effective ion-dust and electron-dustabsorption and scattering that can be detected by broadening of the scattering resonances. Ascompared to the Doppler exponential broadening the dust broadening is described by a power lawand the scattering becomes substantial at frequency differences of the incidental and the scatteredwaves larger then the Doppler width. This can be used for diagnostic of dust. Large angle andsmall angle scattering of ions by dust grains is evaluated using a simple analytical model for largeangle scattering. Both spontaneous scattering and stimulated scattering are investigated.Astrophysical applications are related with modification of Sunyaev-Zeldovich effect. Possibledust diagnostics using electromagnetic wave scattering in edge regions of fusion devices is discussed.