7.8GHz power generation device design using a rectangular dielectric-loaded waveguide

In this paper, we present a design where a bunched relativisticelectron beam traversing inside the rectangular dielectric-loaded(DL) waveguide is used as a high power microwave generation device.Two kinds of methods of calculating the electromagnetic (EM) fieldexcited by a bunched beam are introduced, and in the second methodthe calculation of EM pulse length is discussed in detail. Thedesired operating mode is the LSM_11 due to its stronginteraction with the electron beam. For the designed 7.8~GHzoperating frequency, with a 100~nC/bunch drive train of electronbunches separated by 0.769~ns, we find that high gradient(>30~MV/m) and high power (>160~MW) can be generated. An outputcoupler is also designed which is able to extract the generatedpower to standard waveguides with a 94% coupling efficiency.