Numerical study of chaotic oscillations in the electron beam with virtual cathode in the external non-uniform magnetic fields

Intermittency route to chaos and broadband high-frequency generation in semiconductor superlattice coupled to external resonator

“…These characteristics match or even exceed similar parameters of other solid-state and vacuum sources of chaotic signals [25,[63][64][65][66][67][68]. The latter makes the SL coupled to a resonator promising for using it as a key element in broadband sources of chaotic microwaves or fast random number generators [20,27,43,69], which could have applications in high-speed chaotic communications and spreadspectrum spectroscopy.…”

Effect of the electron beam modulation on the sub-THz generation in the vircator with the field-emission cathode

“…The external uniform focusing magnetic field with induction B is applied along the longitudinal axis of the waveguide. The power of VC oscillations in the model is supposed to extract via a broadband helical slow-wave system 5 loaded on the absorbing output insert 6 (Kalinin et al 2005;Hramov et al 2010;Kurkin et al 2011).…”

“…The operation of VCOs (vircators, virtodes, reflex triodes, etc. ) is based on the formation of the VC in the electron beam with overcritical current (Mahaffey et al 1977;Sullivan et al 1987;Kostov et al 1993Kostov et al , 1999Benford et al 2007;Hramov et al 2010;Verma et al 2014). At the present time the increase of the efficiency, the power and the generation frequency (the advancement to the sub-THz range) of a vircator and the development of the methods for the control of its generation characteristics are the actual problems of a modern plasma physics and high-power microwave electronics.…”

High-power microwave amplifier based on overcritical relativistic electron beam without external magnetic field

“…3,6,7,[10][11][12][13][14][15] VC oscillators (VCOs) (such as vircators, reditrons, and virtodes) are a special class of bremsstrahlung microwave generators, whose operation is based on the formation of a VC in an electron beam (usually relativistic) with overcritical current. 1,3,7,[16][17][18] The main advantages of VCOs are the following: very high output microwave radiation power, a simple construction (let us emphasize that vircators can operate without external focusing magnetic field), fast rise time, the possibility of a simple frequency tuning and regime switching (tunability), rather short operation region and low demands on the quality of the electron beam. 4,6,7,[19][20][21][22][23] The last property is of great importance when the oscillator is fed with short and low-quality beam formed by an explosion emission electron injector.…”