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In this paper, two designs of helix slow-wave structures are proposed for kilowatt millimeter wave helix TWT. In order to suppress backward-wave oscillation, methods of pitch tapering and multi-sever have been used. Electron-wave interaction simulation has been carried out using PIC. According to the results, both of the two designs can produce over 1100 W output power in working band of 27∼31 GHz...
A challenge of high-power millimeter wave TWT is to realize high-power operation without incurring oscillation from backward-wave (BW) interaction. In this paper, the influences of beam parameters such as voltage, current and radius and helix structure parameters of pitch profile on BW oscillation are investigated. In order to get 500W output power, above 12% electron efficiency is considered and...
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