Optimization of the X-band DAW (Disk-and-Washer) accelerating structure

The Disk and Washer (DAW) accelerating structure not only has shunt impedan ce and high Q value, but also has a high coupling constant between the neig hboring cells. At X band, its advantages are especially useful. In this wor k, a mathematical model used to optimize DAW (without supports) cavities by SUPERFISH was built and the solution was presented. Moreover, the optimiza tion of DAW (with supports) by MAFIA400 was also carried out and the influe nce of supports was analyzed. The dispersion curve of the optimized DAW cavities was calculated by URMELT (without supports) and MAFIA400 ( with supports), the influence of the sup ports was studied, and the problem of the overlapping of passband in the ac celerating frequency was discussed.