Load Characteristics of Series- and Parallel-Coupled Accelerating Structures

The load characteristics of series- and parallel-coupled standing-waves accelerating structures are presented. The structure with the series coupling consists of a set of accelerating cavities and coupling resonators, sequentially excited by each other. The structure with the parallel coupling contains the accelerating resonators, excited in parallel by a common high-Q transmission-type resonator. The relations are obtained to determine the operating modes of the structures and the efficiency value in the regime of critical coupling. The characteristic features and differences of the dependence of input coupling coefficient on current loads in structures of various types have been revealed.