Theoretical research on field distribution and coupling between cavities of RF deflector

HEM11 mode in a transverse deflecting structure was simulated, analyzed and compared with TM01 mode. A prototype of this deflecting structure has been made, whose transverse field distribution is simulated with Ansoft HFSS. Perturbation method is used to measure the transverse field distribution with six cavities. The test results accord with the simulated ones. Dispersion curve is also simulated with Ansoft HFSS and it is consistent with the measured one. The equivalent circuit model of the deflector is given. The intercell coupling factors are calculated and the measured results accord with the simulated ones.