Analysis of a U-shaped vane-loaded helical slow-wave structure for wideband travelling-wave tubes |
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| Authors: | Wenqiang Lei Zhonghai Yang Li Liao Ping Liao |
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| Affiliation: | 1. Institute of Applied Electronics , CAEP , Mianyang, Sichuan, China;2. School of Physical Electronics , University of Electronic Science and Technology of China , Chengdu, Sichuan, China |
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| Abstract: | The dispersion equation and interaction impedance of a U-shaped vane-loaded helical slow-wave structure (SWS) is obtained by considering the azimuthal space harmonic in the non-vane region and the helical tape thickness, using the field theory matching method in the azimuthal field discontinuity. The theoretical calculation by electromagnetic analysis is consistent with the simulation result by MAFIA, which can explain some physical essence of the SWS. In the helical SWS, negative dispersion is reported to reduce the second harmonic content of a wideband travelling-wave tube at the low-frequency end of the band. When the SWS is assembled, the support rods are easily located in the groove of the vane. The solution provides a new instruction method for other types of vane-loaded helical SWS. |
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| Keywords: | U-shaped vane-loaded helical SWS Field theory matching method Azimuthal field discontinuity MAFIA Negative dispersion |
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