Multiple scattering of radio frequency waves by blobs: Homogenization of a mixture of blobs and the Waterman-Truell approach

摘要

Radio frequency waves are of tantamount importance for heating and current drive in magnetized fusion plasmas. The scattering process of these waves by a multitude of density fluctuations, such as blobs in the edge region, is studied by homogenizing the part of the edge region which is populated by an ensemble of ellipsoidal blobs immersed in the ambient plasma. For that region, the effective permittivity tensor is formulated on the basis of the depolarization dyadic. The ambient density is considered as step-wise constant. In general, the interfaces between the slab characterized by the effective permittivity tensor and the ambient plasma are not necessarily aligned with the ambient magnetic field which is considered as homogeneous.