Multipactoring Suppression by Fine Grooving of Conductor Surfaces of Coaxial-Line Input Couplers for High Beam Current Storage Rings
Input couplers for radio-frequency accelerating cavities with heavy beam loading undergo many multipactoring zones due to the wide range of the input power. Furthermore, regular coaxial lines are more subject to multipactoring than rectangular waveguides because of the uniformity of the electromagnetic field. Grooving conductor surfaces of coaxial lines is expected to be a promising method to suppress multipactoring under any conditions with heavy beam loading. In this paper, we present a method to design practical fine grooves on conductor surfaces of coaxial lines to suppress multipactoring, based on the multipactoring zone map, and demonstrate the suppression power both in high power tests and in accelerator operations.

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