MAFIA Version 4

Weiland, T.; Bartsch, M.; Becker, Uwe; Bihn, Michael; Blell, U.; Clemens, Markus; Dehler, M.; Dohlus, M.; Drevlak, M.; Du, Xiaosong; Ehmann, R.; Eufinger, A.; Gutschling, Stefan; Hahne, P.; Klatt, Reinhard; Krietenstein, B.; Langstrof, A.; Pinder, P.; Podebrad, Oliver; Pröpper, Thomas; Rienen, Ursula van; Schmidt, David P.; Schuhmann, Rolf; Schulz, A.; Schupp, Sören; Schütt, Petra; Thoma, Peter; Timm, M.; Wagner, Boris; Weber, Rodolphe; Wipf, Susan G.; Wolter, Heike; Zhou, Min

doi:10.1063/1.52369

Cited by 18 publications

(5 citation statements)

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“…Generally, time domain codes are based on three-dimensional * Electronic address: damien.minenna@univ-amu.fr (3D) meshes (thousands to millions of points) based on Maxwell's equations such as particle-in-cell (PIC) codes relying on kinetic (e.g. Vlasov) equations (like cst [3,4], karat [5] or mafia [6]). To reduce the computational costs, one can use specialized frequency (harmonic or steady-state) models (like mvtrad [7], christine [8] or bwis [9]) which rely on reduction models such as equivalent circuits envelope models.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…Another interest of the discrete model is its being a promising tool to analyse high gain and power in nonlinear regimes, beyond the capability of Pierce's model, where it has already shown good results [23,24]. Indeed, the discrete model provides an exact reduction of degrees of freedom for electromagnetic fields and allows to build both frequency [21,25] and time domain algorithms [23,24] as alternatives to current particle-in-cell algorithms, that belong in category (ii), like in [26][27][28]. It also offers several new features compared to Pierce's basic equivalent circuit model, mostly because it is originally expressed in time domain.…”

Section: Introduction and Motivationsmentioning

confidence: 99%

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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“…Die modellierten Anregungsfrequenzen betrugen 8.25, 42.6 und 64.0 MHz. Dies entspricht den magnetischen Grundfeldstärken von 0.2, 1.0 und 1.5 T. Die Berechnung der elektromagnetischen Felder erfolgte mit dem MAFIA-Modul W3[2] im Frequenzbereich auf einer SGI Origin 2000 mit 2 GB RAM. Unter Berücksichtigung der geeigneten dielektrischen Gewebeparameter[4] ergibt die elek-trische Feldstärke E, aus der mit Hilfe der dielektrischen Gewebeparameter und ", sowie der Dichte p der Energieverlust des Feldes im Körper über die spezifische Absorptionsrate (SAR in W/kg) berechnet werden kann zu…”

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Simulation Der Auswirkung Medizinischer Therapie- Und Diagnosemethoden Auf Den Menschlichen Körper

Golombeck¹,

Dössel²

2000

Biomedizinische Technik/Biomedical Engineering

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MAFIA Version 4

Cited by 18 publications

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

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

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

Simulation Der Auswirkung Medizinischer Therapie- Und Diagnosemethoden Auf Den Menschlichen Körper

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