Accelerating Apparatus Curved Coupling Channel Breakdown Reduction

The patent applies local quality by modifying only the edge regions of the coupling channel where electric field concentration occurs. Specifically, the inner radius of the coupling channel is increased at its edge regions while maintaining the original radius in other areas. This localized geometric modification reduces electric field strength precisely where breakdown is most likely to occur, without compromising the overall acceleration performance achieved through high microwave power.

The patent applies spheroidality by replacing the conventional sharp-edged coupling channel with one that has curved edge regions. The inner radius of the coupling channel is increased at the edges, creating a smoother, more rounded geometry. This curvature modification eliminates sharp corners where electric field concentration and high current density occur, thereby reducing the breakdown rate while maintaining relatively simple structural implementation.

The patent addresses the machining issue by modifying the edge regions of the coupling channel where it intersects with the acceleration cavity. Instead of creating sharp cutting edges through direct intersection, the inner radius is increased at these edge regions to create smooth transitions. This curvature modification eliminates the harmful cutting edges that would otherwise increase breakdown rate, while still maintaining ease of manufacture through relatively simple geometric modifications to the coupling channel.