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In this paper, helix slow-wave structures with one sever, two severs and three severs are proposed for kilowatt millimeter wave helix TWT. According to the small-signal theory of BWO, we can calculate the oscillation length of BWO. By setting different sever in TWTs, we successfully make the length of the un-attenuated part shorter than the threshold of BWO and finally achieve the suppression of BWO...
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