Development of a W-Band Sheet-Beam Phase-Velocity-Tapered Traveling-Wave Tube

Abstract

This paper presents the results development of a traveling-wave tube (TWT) with a multi-section staggered double grating slow-wave structure (SDG SWS) and a sheet electron beam. This device can be used in modern terrestrial and deep-space telecommunications systems that require high data throughput. The results of a study of the effect of the spatial dimensions of the slow-wave structure on the high-frequency characteristics are presented. It is shown that the SWS can ensure broadband synchronism with a sheet electron beam at voltages less than 14.6 kV and coupling impedance of ~1 Ω. Furthermore, a decrease in the period leads to a linear increase of the slow-wave factor, enabling long-term interaction with the electron beam in a multi-section SDG SWS with a phase velocity tapering.
The results of the beam-wave interaction simulation in a multi-section TWT are presented. The interaction space was optimized and the device's output parameters were obtained. It was shown that this device is capable of providing an output power of over 45 W at frequencies near 100 GHz in a frequency band exceeding 10 GHz. The interaction space length is approximately 10 cm.
The results of developing an electron-optical system with a periodic permanent magnet focusing system that enables the transport of a sheet electron beam over distances of approximately 10 cm, which corresponds to the interaction space length for a multi-section TWT, are also presented.
This work is supported by the Russian Science Foundation (grant no. 25-72-00050).

Speaker

Roman A. Torgashov
Saratov Branch Kotelnikov Institute of Radioengineering and Electroncs of RAS
Russia

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