ISSN 0869-6632 (Print)
ISSN 2542-1905 (Online)

For citation:

Ryskin N. M., Rozhnev A. G., Minenna D. F., Elskens Y., Andre’ F. Nonstationary discrete theory of excitation of periodic structures and its application for simulation of traveling-wave tubes. Izvestiya VUZ. Applied Nonlinear Dynamics, 2021, vol. 29, iss. 1, pp. 10-34. DOI: 10.18500/0869-6632-2021-29-1-10-34

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Language: 
Russian
Heading: 
Applied Problems of Nonlinear Oscillation and Wave Theory
Article type: 
Review
UDC: 
530.182
DOI: 
10.18500/0869-6632-2021-29-1-10-34

Nonstationary discrete theory of excitation of periodic structures and its application for simulation of traveling-wave tubes

Autors: 
Ryskin Nikita Mikhailovich, Saratov Branch of Kotel`nikov Institute of Radiophysics and Electronics of Russian Academy of Sciences
Rozhnev Andrej Georgievich, Saratov Branch of Kotel`nikov Institute of Radiophysics and Electronics of Russian Academy of Sciences
Minenna Damien F.G., Centre National d’E’tudes Spatiales (CNES)
Elskens Yves, Aix-Marseille Universite’
Andre’ Fre’de’ric, Thales Group
Abstract: 

Aim. This article presents a review of the nonstationary (time-domain) discrete theory of excitation of periodic electromagnetic structures and discusses applications of the theory for simulation of traveling-wave tube (TWT) microwave power amplifiers with slow-wave structures (SWS) of different kind. Methods. The discrete theory is based on a representation of a periodic SWS as a chain of coupled cells. However, these cells are not identical to periods of the structure, and each cell is coupled with not only nearest neighbors, but, in general, with all the other cells. The discrete theory allows useful reformulation of Maxwell equations and simplifies simulation of electromagnetic wave propagation through a periodic structure by a great degree-of-freedom reduction. In this paper, we present the derivation of the basic equations of the discrete model from Maxwell equations and investigate the beam-wave interaction processes by numerical simulation. Results. Derivation of the discrete theory equations in its original form proposed by S.P. Kuznetsov is presented. The results of simulation of the С-band coupled-cavity (CC) TWT are considered, including complicated transients, which accompany spurious self-excitation near cut-off. Further developments of the discrete theory including the Hamiltonian formalism are discussed. The Hamiltonian discrete model is applied for simulation of the 170-W Ku-band helix TWT. The results of simulations are in good agreement with the experimental measurements. Conclusion. The discrete theory proposed by S.P. Kuznetsov in 1980 is a powerful tool for modeling of electromagnetic wave propagation in various periodic slow-wave structures. It allows development of computer codes for time-domain simulation of TWTs, which are promising tools that bears several advantages for industrial and research activities.

Key words: 
nonstationary discrete excitation theory
slow wave structure
traveling wave tube
Hamiltonian formalism
numerical modeling
Acknowledgments: 
Работа выполнена в рамках государственного задания Саратовского филиала ИРЭ им. В.А. Котельникова РАН.
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Received: 
23.12.2020
Accepted: 
30.12.2020
Published: 
01.02.2021
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