Development of a disk-type cavity input coupler

A disk-type input coupler for the RF cavities has been developed and tested in PAL. The motivation for this work is to fabricate a coupler, which has the coaxial input port since PLS RF system utilizes the coaxial transmission line for RF power delivery. During the development, technologies like ceramic brazing, precision machining and coating were required. Computer modeling, fabrication, vacuum seal test, low power test were performed for the prototype. High power test is being performed on the PLS RF test stand with the cavity to be installed in the RF Test-Lab. Good performance are expected and better response to the cavity higher order modes are observed. We will present a whole procedure of the development and the test results. (author)