Geodesic
Higher harmonics generation in a relativistic electron beam with virtual cathode
Izvestiya VUZ. Applied Nonlinear Dynamics, Tome 23 (2015) no. 1, pp. 41-52.

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The study of the microwave generation regimes with intense higher harmonics taking place in a high-power vircator consisting of a relativistic electron beam with a virtual cathode has been made. The characteristics of these regimes, in particular, the typical spectra and their variations with the change of the system parameters (beam current, the induction of external magnetic field) as well as physical processes occurring in the system have been analyzed by means of 3D electromagnetic simulation. It has been shown that the system under study demonstrates the tendency to the sufficient growth of the amplitudes of higher harmonics in the spectrum of current oscillations in the VC region with the increase of beam current. The obtained results allow us to consider virtual cathode oscillators as promising high power mmw-to-THz sources.
Keywords: High-power microwave electronics, vircator, virtual cathode, relativistic electron beam, higher harmonics, THz radiation, electron structures, instabilities of electron beam, plasma frequency. 
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     author = {S. A. Kurkin and A. A. Badarin and A. A. Koronovskii and A. O. Rak and A. E. Khramov},
     title = {Higher harmonics generation in a relativistic electron beam with virtual cathode},
     journal = {Izvestiya VUZ. Applied Nonlinear Dynamics},
     pages = {41--52},
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     volume = {23},
     number = {1},
     year = {2015},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVP_2015_23_1_a2/}
}
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S. A. Kurkin; A. A. Badarin; A. A. Koronovskii; A. O. Rak; A. E. Khramov. Higher harmonics generation in a relativistic electron beam with virtual cathode. Izvestiya VUZ. Applied Nonlinear Dynamics, Tome 23 (2015) no. 1, pp. 41-52. http://geodesic.mathdoc.fr/item/IVP_2015_23_1_a2/