![]() The primary beam- plasma instability involves the excitation of electrostatic plasma waves. ![]() oxide-coated cathode and the discussed experiment is performed in the quiescent afterglow. A pulsed magnetized discharge plasma is produced with a 1 m diam. Electromagnetic radiation arises from both natural beam- plasma systems (e.g., type III solar bursts and kilometric radiation), and from man-made electron beams injected from rockets and spacecraft. This chapter investigates the mechanism by which unstable electrostatic waves of an electron-beam plasma system are converted into observed electromagnetic waves. (Auth.)Įlectromagnetic radiation from beam- plasma instabilities ![]() The instabilities of a plasma in crossed fields are discussed and the electromagnetic instabilities of plasma with finite and high pressure are described. ![]() The results are used to study the instabilities of a strongly inhomogeneous plasma. Following that is a more complete theory of inhomogeneous collisionless plasma instabilities which uses the permittivity tensor and, in the case of electrostatic perturbations, the scalar of permittivity. An elementary theory of drift instabilities is presented, based on the simplest equations of motion of particles in the field of low-frequency and long-wavelength perturbations. The instabilities of a weakly inhomogeneous plasma with the Maxwellian velocity distribution of particles caused by the density and temperature gradients are often called drift instabilities, and the corresponding types of perturbations are the drift waves. ![]() The instabilities that can be studied in the approximation of a magnetic field with parallel straight field lines are treated first, followed by a discussion of the influence of shear on these instabilities. The plasma inhomogeneity across the magnetic field causes a wide class of instabilities which are called instabilities of an inhomogeneous plasma or gradient instabilities. International Nuclear Information System (INIS) ![]()
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