Wave Theory of a Traveling-Wave Tube Operated Near the Cutoff

Кузнецов, А. П.; Кузнецов, С. П.; Rozhnev, A. G.; Blokhina, Elena; Bulgakova, L. V.

doi:10.1023/b:raqe.0000046310.29763.c1

Cited by 26 publications

(21 citation statements)

References 6 publications

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“…The DBE condition has been realized in microstrip transmission lines reported in 25 , and it has been demonstrated recently in fully-metallic circular loaded waveguides 26 . Some theoretical studies have discussed TWT operation very close to the edge of the EM band gap at a regular band edge (RBE), i.e., close to the cut-off frequency [15][16][17][27][28][29][30] , which is a different condition than the DBE explored here.…”

Section: Introductionmentioning

confidence: 94%

“…More elaborate descriptions account for non-linear effects in TWTs [15][16][17] , and a number of numerical methods have been developed incorporating full wave, particle-in-cell (PIC) techniques to accurately model waveguide-beam interaction 18,19 . Typically, periodic SWSs support several Bloch modes (propagating and evanescent), where each mode is represented by an infinite number of spatial Floquet harmonics 20 .…”

Section: Introductionmentioning

confidence: 99%

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Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

et al. 2016

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We propose a new amplification regime based on synchronous operation of four degenerate electromagnetic (EM) modes in a slow-wave structure and the electron beam, referred to as super synchronization. These four EM modes arise in a Fabry-Pérot cavity (FPC) when degenerate band edge (DBE) condition is satisfied. The modes interact constructively with the electron beam resulting in superior amplification. In particular, much larger gains are achieved for smaller beam currents compared to conventional structures based on synchronization with only a single EM mode. We demonstrate giant gain scaling with respect to the length of the slow-wave structure compared to conventional Pierce type single mode traveling wave tube amplifiers. We construct a coupled transmission line (CTL) model for a loaded waveguide slow-wave structure exhibiting a DBE, and investigate the phenomenon of giant gain via super synchronization using the Pierce model generalized to multimode interaction.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

et al. 2016

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“…However, the question of whether the resulting instability is convective or absolute has received relatively little attention in the West. This important question, however, was extensively analyzed in the former Soviet Union [15,18].…”

mentioning

confidence: 99%

“…No assumption on weak beam-circuit interaction or on circuit mode is made as in previous studies [9,15,18] ( , ) ,…”

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confidence: 99%

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Absolute Instability near the Band Edge of Traveling-Wave Amplifiers

et al. 2015

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New oscillator concept based on band edge degeneracy in lumped double‐ladder circuits

Oshmarin

Yazdi

Othman

et al. 2019

IET Circuits, Devices & Systems

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An oscillator scheme based on the degenerate band edge (DBE) in a periodic, double-ladder resonant circuit made of lumped elements is proposed for the first time. The circuit exhibits a DBE in the dispersion diagram of its phase-frequency eigenstates and possesses unique resonance features associated with a high loaded Q-factor resonance, compared to a singleladder circuit. This oscillator is shown to have an oscillation threshold that is half that of a single LC ladder circuit having the same total quality factor, and thus is more robust than an LC oscillator in the presence of losses. Moreover, the double-ladder oscillators have a unique mode selection scheme that leads to stable single-frequency oscillations even when the load is varied. It is also shown that the output amplitude of the double-ladder oscillator is much less sensitive to the output loading compared to single-ladder oscillators. The authors show the analysis and design of such oscillators that potentially lead to enhancing the efficiency of RF components and sources.

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Wave Theory of a Traveling-Wave Tube Operated Near the Cutoff

Cited by 26 publications

References 6 publications

Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

Giant amplification in degenerate band edge slow-wave structures interacting with an electron beam

Absolute Instability near the Band Edge of Traveling-Wave Amplifiers

New oscillator concept based on band edge degeneracy in lumped double‐ladder circuits

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