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Theoretical research on TEM mode feedback for compact design of an X-band triaxial klystron amplifier

机译：X频段三轴Klystron放大器紧凑设计TEM模式反馈的理论研究

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A relativistic triaxial klystron amplifier (TKA) is considered to be one of the most promising high power microwave (HPM) sources for coherent power combination in high frequency bands. In general investigations, the TEM mode leakage and asymmetric modes' competition are considered to play unfavorable roles in the normal operation of TKA. Therefore, mode reflectors with high reflection efficiency in both the TEM mode and the asymmetric modes are employed and expected to significantly suppress the transmissions of the microwaves between the cavities. So the cavities can be separated from each other, while the long drift length is necessary to achieve the deep modulation. Therefore, the size of TKA is noticeably larger compared to other HPM oscillators, which requires large magnetic coil and huge energy consumption. In our present research, it is found that the TEM mode leakage can be utilized to form positive feedback between the cavities, which is significant for electron beam modulation and furthermore to make the devices more compact. In this paper, the mechanism of TEM mode feedback between the cavities is discussed and the conditions of positive and negative feedback are achieved. Besides, an especially designed reflector with high reflection coefficients in asymmetric modes and low reflection coefficients in the TEM mode is designed to utilize the TEM mode and suppress the asymmetric modes. Based on the above research, a TKA adopting positive TEM mode feedback, whose total length is decreased by 23.6% compared to the previous design, is presented. A high power microwave with a power of 2.25GWand a frequency of 8.4GHz is generated with a 690 kV, 9.3 kA electron beam excitation and a 40kW radio-frequency signal injection. Meanwhile, there is insignificant self-excitation of the parasitic mode in the proposed structure in three-dimensional particle-in-cell simulation, and the relative phase shifts between the injected signals and the output microwaves are kept loc
机译：相对论的三轴KlyStron放大器（TKA）被认为是高频带相干功率组合的最有前途的高功率微波（HPM）源之一。在一般调查中，TEM模式泄漏和不对称模式的竞争被认为是在TKA的正常运行中起着不利的作用。因此，采用具有高反射效率和非对称模式的模式反射器，并预期显着抑制空腔之间微波的变速。因此，腔可以彼此分开，而长度漂移长度是实现深度调制所必需的。因此，与其他HPM振荡器相比，TKA的尺寸明显更大，其需要大磁线圈和巨大的能量消耗。在我们目前的研究中，发现TEM模式泄漏可用于在空腔之间形成正反馈，这对于电子束调制很重要，并且进一步使装置更紧凑。在本文中，讨论了空腔之间的TEM模式反馈的机制，实现了正极和负反馈的条件。此外，特别设计具有高反射系数的专业的反射器，在TEM模式中的低反射系数旨在利用TEM模式并抑制不对称模式。基于上述研究，提出了一种采用正温度模式反馈的TKA，其总长度与先前的设计相比减少了23.6％。具有2.25gWAND的功率的高功率微波8.4GHz的频率，具有690 kV，9.3 ka电子束激励和40kW射频信号注入。同时，存在在三维粒子在细胞模拟中所提出的结构的寄生模式的微不足道自激，并且注入的信号和输出微波的相对相移保持LOC

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  • 来源
    《Physics of plasmas》 |2019年第5期|共6页
  • 作者

    Zhang Wei; Ju Jinchuan; Zhang Jun; Zhou Yunxiao; Zhong Huihuang;

  • 作者单位

    Natl Univ Def Technol Coll Adv Interdisciplinary Studies Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Adv Interdisciplinary Studies Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Adv Interdisciplinary Studies Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Adv Interdisciplinary Studies Changsha 410073 Hunan Peoples R China;

    Natl Univ Def Technol Coll Adv Interdisciplinary Studies Changsha 410073 Hunan Peoples R China;

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  • 正文语种 eng
  • 中图分类 等离子体物理学;
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