Abstract
In this paper, a theoretical analysis of a standing-wave dielectric-loaded accelerator based on transmission line model is performed. A practical X-band accelerating structure consisting of a uniform dielectric-loaded tube and a matching cell is considered. The structure is designed to inject high power and long-length radio frequency (RF) pulse into the dielectric-loaded tube at 11.42 GHz. The dominant propagating mode is circular TM01 mode accelerating the electron beam along the axis of the structure. Therefore, the kinetic energy of the electron beam is dependent on the longitudinal profile of the axial electric field which can be approximately calculated by the transmission line model. In this method, every uniform part is considered as a transmission line with its own wave number and characteristic impedance. The accelerating structure is analyzed by the proposed method and the axial electric field along the structure and input reflection coefficient are extracted and compared with the simulation result obtained by full-wave electromagnetic (EM) software. It is demonstrated that there is a good agreement between the simulation and analytical results.
Published Version
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