金属膜片和回流杆结构对大间隙速调管谐振腔高频特性的影响

Influence of the washer-rod structure on high frequency characteristics of wide-gap klystron cavity

利用模拟软件和数值计算方法,对感性加载大间隙速调管谐振腔的高频特性进行了分析,结果表明:增加膜片数量对减弱间隙空间效应的贡献有限,而一旦加载感性回流支撑杆,即使只填充4个膜片,已能基本消除空间电荷效应;由于回流杆的电感和谐振腔的固有电感可比较,导致谐振频率相对提高达9%;与对谐振频率的影响相比,回流杆尺寸对谐振腔电场分布的影响要小得多;而对于经过频率优化的谐振腔,回流杆尺寸对放大器工作特性的影响基本可以忽略.应用以上结论设计出的感性加载大间隙速调管放大器,能稳定提取约1.13GW的微波功率,功率效率约38%.

Using the HFSS and MAGIC code, influences of the washer/rod structure on the high frequency characteristics and the basic operation of the wide-gap klystron amplifier （WKA） are presented. Generally, the rod structure has a great influence on the space- charge potential depression and the eigenmode resonant frequency of the cavity. Once the rods are employed, the space charge field can be nearly eliminated with only 4 washers. Moreover, the presence of the rods raises the cavity eigenmode resonant frequency by 9.0% due to their comparable lumped inductance to the cavity＇s inherent inductance. Nevertheless, if only the cavities are tuned to the desired operation frequency, the effect of the rod size on the basic operation of the WKA is expected to be very small.