Abstract
We analyzed and cold tested a 17 GHz 1-1/2-cell RF gun cavity excited through two coupling holes in the broad wall of a rectangular waveguide. An equivalent circuit theory and an advanced field theory were developed to describe the excitation of an 1-1/2-cell RF gun cavity. SUPERFISH was used to calculate the majority of the equivalent circuit elements as well as the field theory parameters. The matching values of magnetic polarizabilities of the coupling holes were determined by comparing the theory with the measurements. The field theory results were used to model the electric field distribution and accelerating gradient in the RF gun cavity. From this analysis we concluded that the RF gun cavity support gradients as high as 300 MV/m at the cathode without breakdown.
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