DESY, Hamburg
The main RF-Couplers for 1.3GHz TESLA-Type cavities in the FLASH linac need several preparation and processing steps. The RF processing is usually done on coupler test stands (2 couplers pairwise), on a single coupler together with a superconducting cavity in the horizontal cavity test stand, on the module test stand (up to 8 cavities) or finally in FLASH. In FLASH one or more modules are connected to one klystron and conditioned together. Therefore the software was forked several times and merged during the last FLASH shutdown into one version. This is flexible enough to handle all these different test setups, without additional programming for IO hardware or data handling. The system is based on LabView, DOOCS and Linux operating system. The working principle is shown, including a possible outlook for the XFEL cavity production and operation.
DESY, Hamburg
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 endgroups. Because of the long test duration the device is not applicable for massproduction 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 RF-measurement machine and performance of the prototype during fabrication of 40 cavities for FLASH.
