Distributed Coupling Microwave Accelerator Topology
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Solution Overview
Problem
Existing linear accelerator designs face challenges in optimizing cell shape for efficiency and power handling due to limitations in coupling parameters between adjacent cells, leading to reduced efficiency and increased complexity.
Innovation Solution
A new topology for microwave accelerators that allows simultaneous coupling to each cavity with a simple design, using a two-block structure and two-frequency, two-mode operation to minimize losses and maximize shunt impedance, enabling efficient and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-point feeding structure with coupling holes is used to connect adjacent cells, then the structure is simple to manufacture, but the coupling parameters limit the optimization of cell shape for efficiency and power handling capability
Solution Approach 1:
The feeding system is segmented into multiple independent feed points instead of a single-point structure. Each cell or group of cells receives power through separate coupling structures, allowing independent optimization of each cell's shape for maximum efficiency while maintaining manufacturing simplicity through modular assembly
Solution Approach 2:
Coupling holes are designed as intermediary structures that mediate between the feeding waveguide and cell cavities. These coupling holes are optimized as separate elements to minimize power loss while maintaining the simple overall structure, acting as intermediate transmission elements that decouple the feeding mechanism from cell shape constraints
2Device complexity
If coupling holes serve dual purposes as both power transmission and beam tunnel, then the structure is simplified, but the coupling parameters between cells are constrained
Solution Approach 1:
The coupling hole functionality is segmented into separate elements: dedicated coupling holes for power transmission and separate beam apertures for particle transport. This segmentation allows each element to be independently optimized for its specific function, enabling full cell shape optimization freedom while maintaining structural simplicity through modular design
Solution Approach 2:
The cell structure incorporates universal coupling interfaces that can serve multiple cells with different configurations. The standardized coupling hole design allows different cell shapes to be connected through the same coupling mechanism, providing adaptability while maintaining manufacturing simplicity
3Loss of energy
If distributed coupling is used to feed multiple cavities separately, then efficiency and power handling are improved, but the structure becomes more complicated
Solution Approach 1:
The distribution network is segmented into repeating modular units, each handling a specific cell or pair of cells. This modular segmentation allows complex distributed coupling to be built from simple, standardized components that can be manufactured and assembled independently, reducing overall complexity while maintaining the efficiency benefits of separate feeding
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design achieves higher efficiency and reduced power requirements, allowing for higher gradient operation and reduced refrigeration needs in superconducting machines, with the potential to extend the maximum gradient of accelerators to 65 MV/m.
Implementation Method 1
a microwave circuit for a linear accelerator includes multiple metallic cell sections, a pair of distribution waveguide manifolds, and a sequence of feed arms connecting the manifolds to the cell sections
Implementation Method 2
The distribution waveguide manifolds have concave modifications of their walls opposite the feed arms, and the feed arms have portions of two distinct widths
Data Source
AI summary
A microwave circuit for a linear accelerator has multiple metallic cell sections, a pair of distribution waveguide manifolds, and a sequence of feed arms connecting the manifolds to the cell sections. The distribution waveguide manifolds are connected to the cell sections so that alternating pairs of cell sections are connected to opposite distribution waveguide manifolds. The distribution waveguide manifolds have concave modifications of their walls opposite the feed arms, and the feed arms have portions of two distinct widths. In some embodiments, the distribution waveguide manifolds are connected to the cell sections by two different types of junctions adapted to allow two frequency operation. The microwave circuit may be manufactured by making two quasi-identical parts, and joining the two parts to form the microwave circuit, thereby allowing for many manufacturing techniques including electron beam welding, and thereby allowing the use of un-annealled copper alloys, and hence greater tolerance to high gradient operation.