RF tests of a band overlap free DAW accelerating structure

Results of measurements on a six-cell disk-and-washer structure are considered. The RF structure operating at 3600 MHz is optimized for a beta =1 electron beam, trying to avoid the overlap between the band of the accelerating modes and the bands of the dangerous beam deflecting modes. The cavity geometry was not optimized for the maximum shunt impedance, but nevertheless a characteristic shunt impedance Z/Q of 1500 Omega was obtained. Measurements on the six-cell prototype section built following the design show perfect agreement (in frequency and field distribution) with computations.<>