Beam-Wave Resynchronization Method of the Non-Periodic Slow-Wave Structure for TWTs

A beam-wave resynchronization method of the non-periodic slow-wave structure for TWTs is proposed. The condition of the beam-wave interaction is derived, analyzed and discussed. The non-periodic folded-waveguide SWS (NP FW-SWS) is introduced as an application example. The simulated results show that when the input signal is 0.4 W, the output power of the NP FW-TWT can be improved from 199 W to 233 W, and the corresponding electron efficiency can be increased from 27.6% to 32.4% accordingly. For the NP FW-TWTs, the particle velocity and phase velocity at 94 GHz along with the number of elements are also given and compared, which indicates that the beam-wave resynchronization method is beneficial for efficiency enhancement.