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Journal Science Intensive Technologies №11 for 2014 г.
Article in number:
Investigation of electrodynamic parameters of helical slow-wave systems for high-power wideband traveling wave tube
Keywords: wideband TWT helical SWS dispersion characteristic deceleration rate interaction impedance
Authors:
G.A. Azov - Ph. D. (Eng.), Head of Department, JSC «Pluton» (Moscow). E-mail: g.azov@pluton.msk.ru
S.A. Khritkin - Ph. D. (Eng.), Associate Professor, NRU «Higher School of Economics» (Moscow). E-mail: khritkin@miem.edu.ru
Abstract:
To ensure the reliability of calculation results of helical TWT performed at device designing, it is necessary to determine the electrodynamic parameters of slow-wave systems such as deceleration rate and coupling impedance in the frequency range. Currently, there are a number of approaches to simulate electromagnetic characteristics. The results of deceleration rate calculation based on the solution of the dispersion equations written in the framework of the helical cylinder and using the Fourier method for slow-wave system with the tape helix, as well as the data of three-dimensional numerical simulation of helical SWS with combined supports for high-power broadband TWT are presented. The comparison of the calculated and experimental studies results of the gap effect between the outer surface of the helix and the metal edge of the combined metal-ceramic supports construction on the dispersion characteristics of slow-wave system are given. It is shown that the above simplified model based on the solution of the dispersion equation, allow a perfectly acceptable for the design of wideband devices accurately determine the deceleration rate and the coupling impedance and can be successfully used in preliminary calculations.
Pages: 14-21
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