Ring coupling structure for linear accelerator

A new ring coupling structure for a linear accelerator, comprising an acceleration cavity, a coupling cavity, and a beam hole, wherein

• the acceleration cavity and the coupling cavity are alternately assembled together,
• the beam hole penetrates through the acceleration cavity and the coupling cavity,
• the acceleration cavity adopts a bowl-shaped structure,
• a convex cone structure with a mesoporous is disposed on an inner wall of the acceleration cavity along the beam hole,
• coupling holes between the acceleration cavity and the coupling cavity are designed as at least two waist-shaped holes uniformly distributed around the beam hole,
• the coupling cavity adopts a disc-shaped cavity structure with a thickened edge to effectively reduce an axial length of the coupling cavity, and
• a nose cone is disposed in the coupling cavity and welded with cavity walls at two ends of a coupler to ensure an electrical contact, wherein the coupling holes are disposed directly adjacent to the nose cone.