TWTs for space applications commonly have a helix pitch profile which incorporates a section with increased phase velocity followed by a negative phase velocity taper. A simple method is described for the initial design of a helix slow-wave structure of this kind to achieve high overall efficiency. It is shown that the use of a section with increased phase velocity increases the beam efficiency of a TWT while reducing the generation of second harmonic power. The technique is illustrated by its application to a 70 W Ku-band TWT and the performance is shown to be comparable with that of an existing TWT.
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机译：用于太空应用的TWT通常具有螺旋螺距轮廓，该轮廓包含一个截面，该截面的相速度增加，其后为负相速度锥度。描述了一种用于这种螺旋慢波结构的初始设计的简单方法，以实现较高的总体效率。示出了使用具有增加的相速度的截面增加了TWT的射束效率，同时减少了二次谐波功率的产生。通过将其应用于70 W Ku波段TWT来说明该技术，并证明其性能与现有TWT相当。
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