Harmonic generation and parametric excitation in a beam-plasma system
Kerst, Ronald Albert
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https://hdl.handle.net/2142/25585
Description
Title
Harmonic generation and parametric excitation in a beam-plasma system
Author(s)
Kerst, Ronald Albert
Issue Date
1978
Doctoral Committee Chair(s)
Raether, M.J.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
harmonic generation
paramatric excitation
beam-plasma system
wave-wave interaction
wave-particle interaction
Language
en
Abstract
Harmonic generation by wave-wave and wave-particle interactions and parametric excitation of plasma and ion-acoustic waves by a beam-plasma instability are studied, theoretically and experimentally, in a cold beam-plasma system. The dispersion relations for plasma and ion-acoustic waves are calculated. Coupling constants for harmonic generation and parametric excitation are calculated and the equations for the wave amplitudes are solved numerically for some important cases. Measurements are made of fundamental and harmonic wave intensities. Two distinct harmonic generation mechanisms are identified and attributed to wave-wave and wave-particle interactions. Measurements are made of sideband excitation by a beam-plasma instability. Connection of the sideband production with ion dynamics is established. The sideband excitation mechanism is identified as a parametric instability, and good agreement with theory is found.
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