On the synthesis of radiation spectrum in a sectioned relativistic backward wave tube

Design of a high-efficiency dual-band coaxial relativistic backward wave oscillator with variable coupling impedance and phase velocity

“…Significant progress had been achieved in pursuing high power, high efficiency, high-power microwave (HPM) devices (Chen et al, 2002;Eltchaninov et al, 2003;Li et al, 2010;Xiao et al, 2010;Zhang et al, 2010), and the study of HPM relativistic Cherenkov oscillators with the capability of generating dual and multiple microwave frequencies simultaneously in one beam shot is becoming a novel and attractive topic recently (Chen et al, 2009;Ginzburg et al, 2003a;2003b;He et al, 2011;Ju et al, 2009;Ryskin et al, 2001;Tang et al, 2012;Wang et al, 2010;Yang et al, 1999), for the radiation beating radio-frequency waves could be used for electronic warfare systems, and various communication and sounding systems. Chen et al (2009) investigated the dual-frequency magnetically insulated transmission line oscillator (MILO) with azimuthal partition operating at L-band, the particle-in-cell (PIC) simulation results indicated that the power conversion efficiency was only about 8.1%.…”

Tuning of the self-modulation period in a relativistic BWO with strong reflections

“…The range of these applications includes radar systems [1], interference-immune data transfer [2], radio acoustic atmospheric probing [3], and radar countermeasures [4]. All this stimulates significantly the development of the research associated with the issues of generating and controlling the parameters of high-power multi-frequency microwaves.As applied to the relativistic backward-wave oscillator (BWO), the possibilities of controlling the spectrum of multi-frequency generation were first discussed in [5], where it was shown that the generation of several closely spaced frequencies can be realized in a sectioned system with stepwise variation of synchronism detuning between the beam and the operating mode, which is achieved by changing the period of the slowwave system in individual sections. Correspondingly, the difference of the generated frequencies is regulated by the detuning step, i.e., the period of the system.…”

“…As applied to the relativistic backward-wave oscillator (BWO), the possibilities of controlling the spectrum of multi-frequency generation were first discussed in [5], where it was shown that the generation of several closely spaced frequencies can be realized in a sectioned system with stepwise variation of synchronism detuning between the beam and the operating mode, which is achieved by changing the period of the slowwave system in individual sections. Correspondingly, the difference of the generated frequencies is regulated by the detuning step, i.e., the period of the system.…”

Numerical Analysis of Lasing Dynamics in Volume Free Electron Laser

“…Three-wave VFEL was considered in [6], where principles of multi-wave VFEL simulation were proposed. In [18,23,24] and other papers the following system of equations is used to simulate different vacuum electronic devices:…”

“…Interaction of electron beam and electromagnetic field under distributed feedback is the main origin of self-oscillations in vacuum electronic devices [18,23,20]. In [8,11] theoretical and experimental investigations of the super-ACO FEL have been made to observe clear bifurcation and chaos sequences in the response of the FEL to a detuning modulation that is a changing of the synchronism between the electron beam and the optical pulse.…”