In all the models we have studied so far we have assumed that the plasmas are infinite and homogeneous. It is found both theoretically and experimentally, however, that the properties of plasma waves predicted by such models can be strongly modified when studied in plasmas whose dimensions are comparable with the wavelength of the waves. These modifications are called finitesize-geometry effects. In this chapter, we study the propagation of two waves we are already familiar with—electron plasma waves and ion-acoustic waves— along a column of plasma infinite in length but finite in radius, which is supported by a strong magnetic field, and which may be contained inside a waveguide, for example.
KeywordsDispersion Relation Slow Wave Plasma Column Fast Wave Cesium Vapor
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