COMMISSIONING AND UPGRADE OF AUTOMATIC CAVITY TUNING MACHINES FOR THE EUROPEAN XFEL

For more than 20 years DESYhas gained experience in tuning cavities of TESLA [1] shape nine cell cavities for FLASH [2] to field flatness and concentricity. Based on this experience four automatic cavity tuning machines were developed and built by a collaborative effort among FNAL, KEK and DESY[3] to support the high throughput of series cavity productions necessary for new projects like the European XFEL [4], the ILC project, Project “X” and further SRF based future projects. In the meantime two machines were delivered to the collaborative partners KEK and FNAL. The remaining two machines at DESY, are regularly used since several months. A large number of cavities of different types and at different production stages have been automatically tuned for FLASH and also in preparation for the European XFEL series cavity production starting this summer.