Status of the manufacturing process for the Swissfel C-band accelerating structures

For the SwissFEL project a total of 104 C-band (5,712 GHz) accelerating structures are needed. After developing and radio frequency (RF) testing of several short structures (0.5m), three 2meter prototypes have been produced successfully in-house. Avoiding any RF-tuning after fabrication, a high precision machining of the components is necessary. Special procedures were developed and handling equipment was built in order to maintain the accuracy during stacking and vacuum brazing of the parts for the C-band structures. This paper summarizes the manufacturing techniques and the mechanical test results.