The Simulation Calculations and Dielectric Characteristics Investigation of an X-Band Hybrid Dielectric-Iris-Loaded Traveling Accelerating Structure

Mafia code has been used to calculate the RF properties versus the geometric parameters and dielectric permittivity for the X-band (f=9.37GHz) hybrid dielectric-iris-loaded traveling accelerating structure. The simulation results show that when the range of the permittivity is about 5-9, the new structure may have lower ratio of peak surface electric field at the iris to axial accelerating electric field by optimizing the geometric parameters, while r/Q of the new structure being comparable to iris-loaded accelerating structure and r, Q being a little lower. The experimental investigations of the permittivity for selection about the dielectric (ceramics) have been made at the X-band by using the cavity perturbation technique. The measured results are consistent with the simulation results by Microwave Studio. Furthermore, the permittivity stability of the certain ceramic with varying frequency is examined. The experimental results show that the certain ceramic with permittivity of 5.81 is applied to the design of the new accelerating structure.