Key Laboratory of High Energy Radiation Imaging Fundamental Science for National Defense,Department of Engineering Physics,Tsinghua University,Beijing 100084,China;
2.
Northwest Institute of Nuclear Technology,P.O.Box 69-13,Xi’an 710024,China
Coaxial vircator with beam premodulation is analyzed by solving Green’s function, and the relationships of beamwave conversion efficiency to premodulation depth and frequency are obtained. Analysis results show that beam-wave conversion efficiency is in direct proportion to second power of premodulation depth for the same injecting beam, and there is a certain premodulation frequency corresponding to a maximal efficiency for every injecting beam and beam-wave interaction area combination. Finally, enhancing premodulation depth and choosing a reasonable premodulation frequency as efficacious ways to improve beamwave conversion efficiency are suggested．
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