Abstract
Coaxial slow wave structures have always been used to enhance the power handling capacity in the relativistic O-type Cherenkov oscillators generally. However, little attention has been paid to the regularity and the problem it may bring by using large average radius. The aim of this study was to investigate the high-frequency characteristics of coaxial slow wave structures in order to evaluate the influence of the radial dimension comprehensively. The results indicate that a large overmoded ratio can make the power handling capacity increase significantly, but as a result, it will bring some problems such as low efficiency, long starting time, and the difficulty in mode control. In addition, this paper also gives some suggestions and precautions for using large radial dimensions. The conclusion of this paper has strong applicability for the design of coaxial slow wave structures.
Highlights
The relativistic O-type Cherenkov oscillators,1–3 as one kind of high power microwave (HPM) generators,4–6 have received much attention due to their high stability in repetitive or long-pulse applications, easy oscillation in single mode, and wider electron tunability, which offer important commercial benefits over the past 10 years
Bai et al gave the conclusion that the power handling capacity (PHC) of coaxial structures would exceed that of hollow slow wave structure (SWS) as the average radius increases
The effect of large average radius on the properties of PHC in coaxial slow wave structures (CSWSs) was demonstrated over the past 10 years, little attention has been paid to the problem it may bring
Summary
The relativistic O-type Cherenkov oscillators, as one kind of high power microwave (HPM) generators, have received much attention due to their high stability in repetitive or long-pulse applications, easy oscillation in single mode, and wider electron tunability, which offer important commercial benefits over the past 10 years. One effective approach to enhance the PHC is to utilize coaxial slow wave structures (CSWSs).. One effective approach to enhance the PHC is to utilize coaxial slow wave structures (CSWSs).10–15 This kind of structure was proposed by Wen and co-workers and has been investigated in many research studies.. Bai et al gave the conclusion that the PHC of coaxial structures would exceed that of hollow SWSs as the average radius increases.. Further studies are still necessary for finding an efficient method to choose the appropriate radial dimension
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