An Automatic Optimization Approach to the Non-Periodic Folded-Waveguide Slow-Wave Structure for the High Efficiency Traveling Wave Tube

An automatic optimization approach to the non-periodic (NP) folded-waveguide slow-wave structure (FW-SWS) is proposed for the high efficiency traveling wave tube (TWT). Considering the beam-wave synchronism condition, the data of the beam velocity distribution are analyzed and utilized for automatic optimization. For concise expression, a W-band concentric arc NP FW-SWS TWT is automatically optimized as an example, where the beam voltage is set as 6000 V, the beam current is 0.12 A, the magnet field is 0.5 T, and the input power is 0.4 W. Without any training data or previous given datasets, the output power (electronic efficiency) can be optimized to reach 238.7 W (33.1%) at 94 GHz by the automatic optimization approach code within 22.7 h.