ABSTRACT
This book discusses collective (wave) interactions in beams of charged particles, which propagate in plasma and in plasma-like media. It considers the main consequences of these interactions, namely, beam instabilities. The book subjects the strongest beam instabilities and also their most important corollaries. It also presents the modern concept according to which a double electric layer is formed in the plasma containing the ion flow from the magnetosphere of the Earth into its ionosphere; the ions forming this double layer are reflected from it. The book treats certain phenomena in which the plasma per se is absent (or may be absent). It is more up-to-date and comprehensive: it reflects further experimental and theoretical progress achieved in this field in the last decade, and a substantially updated outlook of the phenomena involved.
