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Pseudoperiodic folded waveguide for broadband unimode TWT

This paper describes the pseudoperiodic folded waveguide, which can be used for powerful broadband TWTs. In a periodic folded waveguide or coupled-cavity system (CCS) the 1-st spatial harmonic is used for TWT operation. We shall prove the possibility of achieving a large pseudoperiodic folded waveguide in broad bandwidth due to a matched choice of the step variation and other waveguide dimensions.