Investigation of low-frequency waves in plasma-filled microwave oscillators |
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Authors: | A N Antonov Yu P Bliokh E A Kornilov O F Kovpik M G Lubarskii K V Matyash V O Podobinskii V G Svichenskii Ya B Fainberg |
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Institution: | (1) National Science Center, Kharkov Institute of Physics and Technology, Akademicheskaya ul. 1, Kharkov, 61108, Ukraine |
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Abstract: | The excitation of microwave oscillations by an electron beam in a hybrid plasma waveguide—a slow-wave structure (a sequence of inductively coupled resonators) with a plasma-filled transport channel—is studied both experimentally and theoretically. It is shown that the governing role in the generation of microwaves and their transmission to a feeder line is played by the spatial and temporal plasma-density variations associated with low-frequency ion plasma oscillations. The microwave pressure gives rise to low-frequency plasma oscillations with a rise time shorter than their period. This nonlinear mechanism for the excitation of low-frequency oscillations has a threshold in terms of the microwave power. The unsteady character of the spatial distribution of the plasma density results in intermittent microwave generation and shortens the duration of microwave pulses. |
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