Characteristics of Full-Cell Terminated RF Structures: Results of Analogue Studies

RF structures for linear accelerators and synchrotrons are employing full-cell terminated cavities operating in the p-mode more often than in the past. This p-mode selection is based mainly on performance improvements achieved for superconducting cavities and the economics associated with superconducting cavities in large facilities. An understanding of critical system parameters for these cavities has been reported in the literature and there is a reasonable database available for designers, builders and operators. This paper provides a background understanding of the principal TM010 passband modes, and how they are affected by tuning of the end cells of a multi-cell cavity. In addition, information is presented for interpreting 0-mode structure passbands such as for a drift-tube linac.