High Power Laser and Particle Beams, Volume. 37, Issue 1, 013006(2025)

Design of high-power TM01 online mode selection coupling device

Ligang Zhang, Weibing Tan, Xiaoze Li, Xiaoxin Zhu, and Xianggang Hu
Author Affiliations
  • Northwest Institute of Nuclear Technology, Xi’an 710024, China
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    To solve the problems of low inhibition of parasitic mode and measurement accuracy is susceptible to interference of parasitic modes in traditional high power microwave online measurement devices, a high-power TM01 mode coupling device is studied, which is applied to the Ku-band relativistic backward wave oscillator (RBWO) online measurement system. Due to the RBWO emission’s angular inhomogeneity, asymmetric modes is generated, and the traditional single-arm porous circular waveguide coupler cannot solve the competition problem between the TM01 mode and the asymmetric modes, which generally leads to the detection waveform distortion and coupling degree judgment deviation and seriously affects the accuracy of the online evaluation of the output power of TM01 mode of the RBWO. For this reason, combining the four-arm porous coupling structure with the TM01 mode selection network, a novel online mode-selective coupling device is proposed in this paper. Using the field structure difference of different waveguide modes, the proposed device realizes the differential coupling of TM01 mode and other parasitic modes and solves the problem of inaccurate online test power caused by parasitic mode interference. The simulation results show that the coupling degree of the proposed new coupler to TM01 mode is more than 20 dB higher than that of the other modes, and the on-line test waveform and power measured in the high-power experiment are in good agreement with the radiated field test waveform and power, and the coupling stability is significantly improved.

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    Ligang Zhang, Weibing Tan, Xiaoze Li, Xiaoxin Zhu, Xianggang Hu. Design of high-power TM01 online mode selection coupling device[J]. High Power Laser and Particle Beams, 2025, 37(1): 013006

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    Paper Information

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    Received: May. 6, 2024

    Accepted: Nov. 11, 2024

    Published Online: Feb. 21, 2025

    The Author Email:

    DOI:10.11884/HPLPB202537.240159

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