A new tuning method for traveling wave structures

At DESY S-Band accelerating structures have been under development since 1993. Fourteen 5.2 meter long sections have to be replaced in the injector linac (LINAC II) and overall four 6 meter long sections have to be build for the S-Band test facility at DESY. A new tuning procedure for the accelerating structure after brazing has been developed which uses bead-pull field distribution measurements instead of a detuning plunger. Amplitude and phase of the field are measured simultaneously along the structure without touching the surface on a 13 meter long horizontal bench.