Increasing TWTs' electronic efficiency

A possibility of a significant increase in the electronic efficiency of TWTs is considered in this paper. The output power and the power at the attenuator of a two-section TWT are measured, simulated, and calculated analytically at a fixed frequency for different distances between the attenuator and the output terminal. The significant difference between the output power and power at the attenuator's input is explained by the e-beam intensive interaction with the wave in the absorbing section. Attenuators with decreased interaction impedance are offered to increase the TWT's electronic efficiency.