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It has been technically challenging to efficiently couple externalradiofrequency (RF) power to cylindrical dielectric-loaded accelerating (DLA)structures, especially when the DLA structure has a high dielectric constant.This paper presents a novel design of matching section for coupling the RFpower from a circular waveguide to an X-band DLA structure with a dielectricconstant epsilon_r=16.66 and a loss tangent tan_delta=0.0000343. It consists ofa very compact dielectric disk with a width of 2.035 mm and a tilt angle of 60degree, resulting in a broadband coupling at a low RF field which has thepotential to survive in the high-power environment. To prevent a sharpdielectric corner break, a 45 degree chamfer is also added. A microscale vacuumgap, caused by metallic clamping between the thin coating and the outer thickcopper jacket, is also studied in detail. Through optimizations, more than 99%of RF power is coupled into the DLA structure, with the maximum electromagneticfields located at a DLA structure. Tolerance studies on the geometricalparameters and mechanical design of the full-assembly structure are alsocarried out as a reference for realistic fabrication.

A compact, low field, broadband matching section for externally-powered X-band dielectric-loaded accelerating structures