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Input couplers for radio-frequency accelerating cavities with heavy beam loading undergo many multipactoring zones due to the wide range of input powers. Furthermore, regular coaxial lines have more multipactoring than rectangular waveguides because of more uniformity of the electromagnetic field. Grooving conductor surfaces of coaxial lines is expected to be a promising method for suppressing multipactoring under any conditions with heavy beam loading. In this paper, we present a method for designing practical fine grooves on conductor surfaces of coaxial lines to suppress multipactoring, based on multipactoring zone maps, and demonstrate the suppressive power both in high-power tests and accelerator operations

Multipactoring suppression by fine grooving of conductor surfaces of coaxial-line input couplers for high beam current storage rings