On simulations of coaxial bragg structure with double-sinusoidal ripples

Based on the mode-coupling method,Fortran soft simulations have been carried out for the frequency response in a coaxial Bragg structure with double-sinusoidal ripples.Results show that compared with the ordinary Bragg structure with single-sinusoidal ripples,when the corrugation amplitude is invariant,the bandwidth of the operating mode and the competing mode can be narrowed and the interval of the band-gaps is broadened by use of the double-sinusoidal ripples.The band-gap overlap in an overmoded coaxial Bragg structure can be efficiently separated,the residual side-lobes of the frequency response also can be effectively suppressed,and the Q factor is get greater and the selectivity of frequency is enhanced.These peculiarities are favorable to constructing a high-Q resonator for single higher-order mode operation of high-power free-electron devices.