Radiation Phenomena of Plasma Waves Part 3. Radiation from Finite Sources

Radiation phenomena of plasma waves has been reviewed in three parts, fundamental radiation theory, radiation from point sources, and radiation from finite sources. It is the author's impression that the theoretical prediction of the resonance cone by Kuehl (Phys. Fluids 5, 1095 [1962]) initiated much of the theoretical work. The experimental observation of the resonance cone by Fisher and Gould (Phys. Fluids 14, 857 [1971]) is an epoch-making work in the field of radiation problems from point sources. Although finite sources had been used for excitation of many plasma waves, the experimental confirmation of the radiation patterns from finite sources by Shen et al. (Rad. Sci. 5, 611 [1970]) has initiated much later work. Since thier investigations, radiation phenomena of plasma waves have been investigated and been made clear by many authors, as shown in this review paper Parts 1 - 3. The essential radiation phenomena from point sources have been clarified experimentally except for an observation of electromagnetic ion waves radiated from point sources. Radiation phenomena from finite sources will be investigated further because there are various sources required for various goals, e.g., for heating of plasma infusion devices, etc. These investigations will progress into nonlinear phenomena, instabilities, and inhomogenuous effects in plasmas. It is a great pleasure for the author of this review paper if he could give some insight or any help for further developments in plasma sciences.