Influence of Plasma Unsteadiness on the Spectrum and Shape of Microwave Pulses in a Plasma Relativistic Microwave Amplifier
- Authors: Kartashov I.N.1, Kuzelev M.V.1, Strelkov P.S.2, Tarakanov V.P.3,4
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Affiliations:
- Faculty of Physics
- Prokhorov General Physics Institute
- Joint Institute for High Temperatures
- National Research Nuclear University “MEPhI”
- Issue: Vol 44, No 2 (2018)
- Pages: 289-298
- Section: Plasma Electronics
- URL: https://journals.rcsi.science/1063-780X/article/view/186701
- DOI: https://doi.org/10.1134/S1063780X1802006X
- ID: 186701
Cite item
Abstract
Dependence of the shape of a microwave pulse in a plasma relativistic microwave amplifier (PRMA) on the initial plasma electron density in the system is detected experimentally. Depending on the plasma density, fast disruption of amplification, stable operation of the amplifier during the relativistic electron beam (REB) pulse, and its delayed actuation can take place. A reduction in the output signal frequency relative to the input frequency is observed experimentally. The change in the shape of the microwave signal and the reduction in its frequency are explained by a decrease in the plasma density in the system. The dynamics of the plasma density during the REB pulse is determined qualitatively from the experimental data by using the linear theory of a PRMA with a thin-wall hollow electron beam. The processes in a PRMA are analyzed by means of the KARAT particle-in-cell code. It is shown that REB injection is accompanied by an increase in the mean energy of plasma electrons and a significant decrease in their density.
About the authors
I. N. Kartashov
Faculty of Physics
Author for correspondence.
Email: igorkartashov@mail.ru
Russian Federation, Moscow, 119991
M. V. Kuzelev
Faculty of Physics
Email: igorkartashov@mail.ru
Russian Federation, Moscow, 119991
P. S. Strelkov
Prokhorov General Physics Institute
Email: igorkartashov@mail.ru
Russian Federation, Moscow, 119991
V. P. Tarakanov
Joint Institute for High Temperatures; National Research Nuclear University “MEPhI”
Email: igorkartashov@mail.ru
Russian Federation, Moscow, 125412; Moscow, 115409