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Author: A. I. Akhiezer Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
The paper discusses the interaction of a beam of charged particles with an electron plasma. It is shown that the state of the beam, which is characterized by constant and uniform speed and density, turns out to be unstable. If such a beam goes into a plasma fluctuations in density and speed are formed in it and these are propagated in the form of a wave with increasing amplitude. The longitudinal field connected with it also has the character of a wave with increasing amplitude. (Author).
Author: A. I. Akhiezer Publisher: ISBN: Category : Languages : en Pages : 16
Book Description
The paper discusses the interaction of a beam of charged particles with an electron plasma. It is shown that the state of the beam, which is characterized by constant and uniform speed and density, turns out to be unstable. If such a beam goes into a plasma fluctuations in density and speed are formed in it and these are propagated in the form of a wave with increasing amplitude. The longitudinal field connected with it also has the character of a wave with increasing amplitude. (Author).
Author: A. I. Akhiezer Publisher: Elsevier ISBN: 1483185893 Category : Science Languages : en Pages : 201
Book Description
International Series of Monographs in Natural Philosophy: Collective Oscillations in a Plasma, Volume 7 presents specific topics within the general field of radio waves propagation. This book contains five chapters that address the theory of linear oscillations in a plasma, the spectra of the eigen oscillations, and the mechanism of high-frequency heating. The opening chapters deal with the self-consistent fields; development of initial perturbation; dispersion permittivity tensor of a plasma in a magnetic field; effect of thermal motion of particles on low-frequency resonances; excitation of oscillations by modulated azimuthal currents; and cyclotron damping of low-frequency oscillations. The next chapters describe the nature of beam instability, the fluctuations in a free equilibrium plasma, and the current causing scattered waves. A study of the probability of scattering is presented. The concluding chapters are devoted to the scattering of electromagnetic waves in a plasma-beam system and the coefficient of reflection determination. The book can provide useful information to scientists, physicists, students, and researchers.
Author: Publisher: ISBN: Category : Languages : en Pages : 14
Book Description
Electron plasma oscillations were investigated. The plasma was generated and controlled by an electron beam. The results of the investigation show that the character of the observable oscillations severely vary on the plasma boundaries.
Author: National Aeronautics and Space Adm Nasa Publisher: Independently Published ISBN: 9781729283363 Category : Science Languages : en Pages : 44
Book Description
Coherent high frequency oscillations near the electron plasma frequency (omega approx. less than omega sub p) are generated by electrodes with positive dc bias immersed in a uniform Maxwellian afterglow plasma. The instability occurs at the sheath-plasma resonance and is driven by a negative RF sheath resistance associated with the electron inertia in the diode-like electron-rich sheath. With increasing dc bias, i.e., electron transit time, the instability exhibits a hard threshold, downward frequency pulling, line broadening and copious harmonics. The fundamental instability is a bounded oscillation due to wave evanescence, but the harmonics are radiated as electromagnetic waves from the electrodes acting like antennas. Wavelength and polarization measurements confirm the emission process. Electromagnetic waves are excited by electrodes of various geometries (planes, cylinders, spheres) which excludes other radiation mechanisms such as orbitrons or beam-plasma instabilities. The line broadening mechanism was identified as a frequency modulation via the electron transit time by dynamic ions. Ion oscillations at the sheath edge give rise to burst-like RF emissions. These laboratory observations of a new instability are important for antennas in space plasmas, generation of coherent beams with diodes, and plasma diagnostics. Stenzel, R. L. Unspecified Center NAGW-1570...
Author: G. P. Berezina Publisher: ISBN: Category : Languages : en Pages : 24
Book Description
Results are given of experiments on the detection and study of oscillations developed in a beam and plasma produced as the result of their interaction. The experiments were conducted under conditions where the electron Langmuir frequency of the plasma, was less than the electron cyclotron frequency. The conditions of wave excitation in the beam and plasma, their frequency spectra, phase velocities, amplification factors, electrical field intensity, and absolute values and spectral distribution of excited oscillation power are determined. Experimental results from measurement of frequencies, amplification factors and phase velocities of excited oscillations in the plasma are in satisfactory agreement with calculated data. (Author).
Author: Catherine Sulem Publisher: Springer Science & Business Media ISBN: 0387227687 Category : Mathematics Languages : fr Pages : 363
Book Description
Filling the gap between the mathematical literature and applications to domains, the authors have chosen to address the problem of wave collapse by several methods ranging from rigorous mathematical analysis to formal aymptotic expansions and numerical simulations.
Author: F. W. Crawford Publisher: ISBN: Category : Oscillations Languages : en Pages : 110
Book Description
This analysis is concerned mainly with oscillations and fluctuations which occur either spontaneously, or as a result of deliberate excitation, in low-pressure, hot-cathode plasmas. Experimental observations on high and low frequency effects occurring spontaneously are discussed, and speculations are made on the possible gener-ATION MECHANISMS. In many cases, theories of these mechanisms have been treated in experiments involving deliberate excitation of oscillations, and comparisons are made where relevant. For device applications, and to relieve the difficulties which occur in quantitative experiments in plasma physics, it is important that the sources of spontaneous oscillations should be understood and suppressed if possible. The analysis includes a discussion of work which has been carried out to reduce these effects, and concludes with some suggestions for further lines of attack on the problems. (Author).
Author: A. I. Akhiezer
Author: A. I. Akhiezer
Author: Kirill Dmitrievich Sinelʹnikov
Author: A. I. Akhiezer
Author: 
Author: National Aeronautics and Space Adm Nasa
Author: G. P. Berezina
Author: Catherine Sulem
Author: Winston Malcolm Gottschalk
Author: Stanford University. Microwave Laboratory
Author: F. W. Crawford