Title :
Computationally generated velocity taper for efficiency enhancement in a coupled-cavity traveling-wave tube
Author :
Wilson, Jeffrey D.
Author_Institution :
NASA Lewis Res. Center, Cleveland, OH, USA
fDate :
4/1/1989 12:00:00 AM
Abstract :
A computational routine has been created to generate velocity tapers for efficiency enhancement in coupled-cavity traveling-wave tubes (TWTs). Programmed into the NASA multidimensional large-signal coupled-cavity TWT computer code, the routine generates the gradually decreasing cavity periods required to maintain a prescribed relationship between the circuit phase velocity and the electron-bunch velocity. Computational results for several computer-generated tapers are compared to those for an existing coupled-cavity TWT with a three-step taper. Guidelines are developed for prescribing the bunch-phase profile to produce a taper for high efficiency. The resulting taper provides a calculated RF efficiency 45% higher than the step taper at center frequency and at least 37% higher over the bandwidth
Keywords :
electron beams; electronic engineering computing; travelling-wave-tubes; NASA; TWTs; bunch-phase profile; circuit phase velocity; computational routine; computer code; coupled-cavity; efficiency enhancement; electron-bunch velocity; high efficiency; microwave tubes; multidimensional large-signal; traveling-wave tube; velocity taper; Acceleration; Bandwidth; Closed-form solution; Coupling circuits; Electron tubes; Guidelines; High performance computing; Multidimensional systems; NASA; Radio frequency;
Journal_Title :
Electron Devices, IEEE Transactions on
