4.6 Article

Design of a High-Power V-Band Klystron With Internal Coupling Multigap Cavity

Journal

IEEE TRANSACTIONS ON ELECTRON DEVICES
Volume 69, Issue 5, Pages 2644-2649

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TED.2022.3159260

Keywords

Couplings; Klystrons; Resonators; Radio frequency; Integrated circuit modeling; Bandwidth; Apertures; Beam optics; extended interaction klystron (EIK); genetic algorithms (GAs); internal coupling cavity; V-band

Funding

  1. National Magnetic Confinement Fusion (MCF) Energy Research and Development Program [2018YFE0305100]
  2. Scientific Instrument Developing Project of the Chinese Academy of Sciences [YJKYYQ20180005]

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This article presents the design study of a V-band klystron with an internal coupling cavity, which can significantly improve the efficiency and bandwidth of the RF circuit.
In this article, the design study of a V-band klystron with an internal coupling cavity is presented. The effective characteristic impedance of the internal coupling cavity is approximately 25% higher than that of the external coupling cavity when both operate at pi mode. A V-band RF circuit of 35% efficiency has been designed based on the proposed internal coupling cavity. An RF circuit based on single-gap resonators was designed first with the help of genetic algorithms (GAs). Then, a five-gap internal coupling cavity replaced the last several resonators to improve circuit bandwidth and efficiency. Simulation results have shown that the proposed internal coupling cavity can significantly improve the efficiency and bandwidth of an RF circuit based on single-gap resonators. Driven by a 60-kV and 9-A pencil beam, the designed RF circuit can achieve a peak power of 188.5 kW, a gain of 47.8 dB, and a 1-dB bandwidth of 180 MHz. The matching high compression ratio beam optics is also elaborated in this article.

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