DEVELOPMENT AND DESIGN OF A RF-MEASUREMENT MACHINE FOR THE EUROPEAN XFEL CAVITY FABRICATION

Radio frequency measurements on parts and subassemblies of superconducting cavities during its fabrication are a proper method of quality management and quality assurance. During the fabrication of 1.3 GHz cavities for FLASH, a simple device was used for measuring the half cells, dumb-bells and end groups. Because of the long test duration the device is not applicable for mass production of 800 cavities. A semiautomated RF measurement machine was designed and built. This machine performs an easy load of the parts, consistent RF contacts, automated RF measurements and documentation. We describe the functionality of the RFmeasurement machine and performance of the prototype during fabrication of 40 cavities for FLASH.