Twisted Waveguide Structures for Charged Particle Acceleration
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Solution Overview
Problem
Existing slow-wave structures for charged particle acceleration are expensive to manufacture and require individual tuning of each resonant cell, making them costly and time-consuming to produce.
Innovation Solution
A twisted waveguide structure with a constant cross-section and helical pitch that supports electromagnetic wave propagation at or slower than the speed of light, allowing for inexpensive fabrication and tuning-free operation, and can be used in both normal conducting and superconducting systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multi-cell disk-loaded structures with corrugations are used, then slow wave propagation is achieved, but manufacturing cost and complexity increase due to expensive welding or brazing processes
Solution Approach 1:
The patent merges multiple individual cell structures into a single continuous twisted waveguide structure. Instead of assembling separate cells through expensive welding or brazing, the invention uses one monolithic structure with a twisted geometry that inherently provides the slow wave effect, thereby eliminating the need for costly joining processes while maintaining the desired phase velocity characteristics
Solution Approach 2:
The patent applies a twisted or helical curvature to the waveguide structure instead of using straight sections. This curvature transforms the wave propagation characteristics to achieve slow wave effect. The twisted geometry allows the structure to support modes with phase velocities at or below the speed of light, while the continuous curved form enables simpler manufacturing compared to assembled corrugated structures
2Reliability
If each cell is individually tuned to resonate at a specified frequency, then proper acceleration is achieved, but time and cost increase due to individual tuning requirements
Solution Approach 1:
The patent combines the resonance function of multiple individual cells into a single unified twisted waveguide structure. The entire structure resonates as one unit at a specified frequency, eliminating the need to tune each cell individually. This merging approach maintains the required resonance frequency accuracy for proper particle acceleration while dramatically reducing the time and labor required for setup
Solution Approach 2:
The twisted waveguide structure serves multiple functions simultaneously: it provides slow wave propagation, maintains resonance at the required frequency, and guides particle beams. This multi-functionality in a single structure eliminates the need for separate tuning operations for each cell, as the unified structure achieves all required functions through its overall geometry and dimensions
3Ease of manufacture
If straight hollow waveguide is used, then simple fabrication is possible, but only fast wave propagation is supported which is unsuitable for charged particle acceleration
Solution Approach 1:
The patent transforms the straight waveguide into a twisted or helical structure. This curvature modification changes the electromagnetic field distribution and wave propagation characteristics, enabling the structure to support slow wave modes with phase velocities at or below the speed of light. The twisted geometry achieves the required speed reduction while still allowing for relatively simple fabrication compared to traditional multi-cell structures
Solution Approach 2:
The patent changes the geometric parameters of the waveguide by introducing a twist angle or helical pitch. This parameter change transforms the wave propagation characteristics from fast wave only to including slow wave modes. By adjusting the twist rate and other geometric parameters, the structure can be designed to support propagation at specific phase velocities suitable for charged particle acceleration, while maintaining fabrication simplicity
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
The twisted waveguide structure reduces production costs and eliminates the need for individual cell tuning, enabling efficient particle beam acceleration while allowing for external frequency tuning and effective damping of higher-order modes.
Implementation Method 1
supports electromagnetic wave propagation at a phase velocity equal to or slower than the speed of light in free space
Data Source
AI summary
A rapidly twisted electromagnetic accelerating structure includes a waveguide body having a central axis, one or more helical channels defined by the body and disposed around a substantially linear central axial channel, with central portions of the helical channels merging with the linear central axial channel. The structure propagates electromagnetic waves in the helical channels which support particle beam acceleration in the central axial channel at a phase velocity equal to or slower than the speed of light in free space. Since there is no variation in the shape of the transversal cross-section along the axis of the structure, inexpensive mechanical fabrication processes can be used to form the structure, such as extrusion, casting or injection molding. Also, because the field and frequency of the resonant mode depend on the whole structure rather than on dimensional tolerances of individual cells, no tuning of individual cells is needed. Accordingly, the overall operating frequency may be varied with a tuning/phase shifting device located outside the resonant waveguide structure.