Discrete model of a folded-waveguide traveling-wave tube

Terentyuk, Artem G.; Rozhnev, A. G.; Ryskin, Nikita M.

doi:10.1109/ivec.2017.8289668

Cited by 5 publications

(15 citation statements)

References 6 publications

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“…We also presume that the discrete theory predicts the gain more accurately because of the significant growth rate difference between the models. But to prove this, we need to compare our model with a PIC code or with experimental measurements (this investigation is ongoing [17][18][19]).…”

Section: Discussionmentioning

confidence: 99%

“…In 1980, Kuznetsov introduced [14] a field decomposition in a periodic medium using Floquet condition and Gel'fand transform. This work was revisited from 2007 on at Saratov University [15,17], to model coupled cavity traveling wave tubes in frequency domain. This decomposition was then adapted to simulate helix traveling wave tubes by a collaboration [27,28] between Thales Electron Devices at Vélizy, and Aix-Marseille University, as an alternative to equivalent circuit approaches [29].…”

Section: Discrete Modelmentioning

confidence: 99%

“…The discrete model provides an exact reduction of degrees-of-freedom for electromagnetic fields and allows to build both frequency [17] and time domain algorithms [18,19] that are faster alternatives to current particle-in-cell (PIC) algorithms [20]. It also offers several new features compared to Pierce's well-known equivalent circuit model, mostly because it is originally expressed in time domain.…”

Section: Introductionmentioning

confidence: 99%

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Recent discrete model for small-signal analysis of traveling-wave tubes

et al. 2019

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equipe turbulence plasma, case 322 campus Saint Jérôme, av. esc. Normandie-Niemen, To perform accurate numerical simulations of the wave-particle interaction as it occurs in particular in traveling wave tubes, a new approach using field decomposition with large reduction of degrees of freedom has been proposed : the discrete model. To assess its validity, we compare it with the well-established Pierce equivalent circuit model in small signal regime.Before the comparison, the beam-wave interaction in both models is reformulated using a new pedagogical approach, dealing with associated beam, circuit-beam, and circuit impedances.We show analytically and with a numerical example that the newly developed reduced model is very close to the Pierce model. Interestingly, small deviations do exist at the edges of the amplification band, for which the reduced model offers a physical interpretation. PACS numbers: 84.40.Fe (Microwave tubes), 52.40.Mj (Particle beam interaction in plasmas)

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Section: Discussionmentioning

confidence: 99%

Section: Discrete Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recent discrete model for small-signal analysis of traveling-wave tubes

et al. 2019

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“…Our algorithm dimoha is based on the Kuznetsov discrete model [12,13,[17][18][19][20][21][22][23] which uses an exact field decomposition for periodic structures for large-signal regimes. The SWS is directed along the z-axis with pitch d and cell index n ∈ Z.…”

Section: B the Discrete Modelmentioning

confidence: 99%

“…Beside the time domain approach, one can use a frequency domain version of Kuznetsov's discrete model [20,21,23,24] in small signal regime. Its validity was assessed [21] by comparing it with Pierce's four-waves theory [25].…”

Section: B the Discrete Modelmentioning

confidence: 99%

DIMOHA: A Time-Domain Algorithm for Traveling-Wave Tube Simulations

Minenna

Elskens

André

et al. 2019

IEEE Trans. Electron Devices

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To simulate traveling-wave tubes (TWTs) in time domain and more generally the wave-particle interaction in vacuum devices, we developed the DIscrete MOdel with HAmiltonian approach (dimoha) as an alternative to current particle-in-cell (PIC) and frequency approaches. Indeed, it is based on a longitudinal N -body Hamiltonian approach satisfying Maxwell's equations. Advantages of dimoha comprise: (i) it allows arbitrary waveform (not just field envelope), including continuous waveform (CW), multiple carriers or digital modulations (shift keying); (ii) the algorithm is much faster than PIC codes thanks to a field discretization allowing a drastic degree-of-freedom reduction, along with a robust symplectic integrator; (iii) it supports any periodic slow-wave structure design such as helix or folded waveguides; (iv) it reproduces harmonic generation, reflection, oscillation and distortion phenomena; (v) it handles nonlinear dynamics, including intermodulations, trapping and chaos. dimoha accuracy is assessed by comparing it against measurements from a commercial Ku-band tapered helix TWT and against simulations from a sub-THz folded waveguide TWT with a staggered double-grating slow-wave structure. The algorithm is also tested for multiple-carriers simulations with success. PACS numbers: 45.20.Jj (Lagrangian and hamiltonian mechanics), 52.40.Mj (Particle beam interaction in plasmas), 84.40.Fe (Microwave tubes)

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Time simulation of the nonlinear wave–particle interaction in meters-long traveling-wave tubes

et al. 2021

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We propose a multi-particle self-consistent Hamiltonian (derived from an N -body description) that is applicable for periodic structures such as traveling-wave tubes (TWTs), gyrotrons, free-electron lasers, or particle accelerators. We build a 1D symplectic multi-particle algorithm to simulate the nonlinear wave-particle interaction in the time domain occurring in an experimental 3-meters long helix TWT. Our algorithm is efficient thanks to a drastic reduction model. A 3D helix version of our reduction model is provided. Finally, we establish an explicit expression of the electromagnetic power in the time domain and in non-monochromatic (non "continuous waveform") regime.

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Discrete model of a folded-waveguide traveling-wave tube

Cited by 5 publications

References 6 publications

Recent discrete model for small-signal analysis of traveling-wave tubes

Recent discrete model for small-signal analysis of traveling-wave tubes

DIMOHA: A Time-Domain Algorithm for Traveling-Wave Tube Simulations

Time simulation of the nonlinear wave–particle interaction in meters-long traveling-wave tubes

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