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High power folded waveguide traveling wave tube based on variable-width technology

机译：基于可变宽度技术的高功率折叠波导行波管

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摘要

Variable-width technology applied to the folded waveguide traveling wave tube (FW-TWT) is proposed in this paper to suppress the lower band-edge oscillation and to expand the operating bandwidth when the operating frequency shifts toward the lower band for obtaining larger output power. Changes in the width of the slow wave structure (SWS) determine the variation of the lower-cutoff-frequency (LCF), which makes the LCF's distribution a frequency range rather than a specific frequency-point. The lower band-edge oscillation will not be focused on a special position but distributed in a frequency-band range in which multiple oscillation modes compete with each other near the LCF. The lower band-edge oscillation can be suppressed by mode competition to some extent. In addition, the width variation of SWS also results in the phase-velocity variation, and thus, the operating bandwidth of FW-TWT can be further improved by the optimized design of variable-width-SWS parameters. Beam-wave interaction simulations predicted that power and bandwidth improvements have been achieved without the lower band-edge oscillation. Meanwhile, four solutions are given for further certifying the effectiveness of the variable-width method in lower band-edge oscillation suppression and bandwidth widening. An output power level of over 350W in a frequency range of 85-90 GHz (5 GHz) is obtained, with a maximum power of similar to 648 W and an electron efficiency of similar to 12.1% at 88 GHz with a beam current of 260mA and a beam voltage of 20.5 kV.
机译：在本文中提出了应用于折叠波导行波管（FW-TWT）的可变宽度技术，以抑制下带边振荡，并在朝下频率偏移以获得更大的输出功率时扩展操作带宽。慢波结构的宽度（SWS）的宽度的变化确定了较低截止频率（LCF）的变化，这使得LCF的分布是频率范围而不是特定频率点。较低的带边振荡不会聚焦在特殊位置，而是在频带范围内分布在其中多个振荡模式在LCF附近彼此竞争的频带范围内。在某种程度上可以通过模式竞争抑制下带边振荡的较低带边振荡。另外，SWS的宽度变化也导致相位速度变化，因此，通过可变宽度-WS参数的优化设计，可以进一步提高FW-TWT的操作带宽。光束波相互作用模拟预测，在没有较低的带边振荡的情况下已经实现了电力和带宽改进。同时，给出了四种解决方案，用于进一步认识到在较低带边振荡抑制和带宽加宽中的可变宽度方法的有效性。获得85-90GHz（5GHz）的频率范围内超过350W的输出功率电平，最大功率类似于648W，电子效率与88GHz的电效相似，具有260mA的光束电流和光束电压为20.5 kV。

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  • 来源
    《Physics of plasmas》 |2019年第5期|共7页
  • 作者

    Lu Zhigang; Ge Weihua; Wen Ruidong; Su Zhicheng; Wang Zhanliang; Tang Tao; Gong Huarong; Gong Yubin;

  • 作者单位

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

    Univ Elect Sci &

    Technol China Natl Key Lab Sci &

    Technol Vacuum Elect Sch Elect Sci &

    Engn Chengdu 610054 Sichuan Peoples R China;

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