Fe-Based Acceleration Cavity Core for Low-Heat Stable Gap Voltage
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Solution Overview
Problem
Conventional high-frequency acceleration cavities using ferrite cores suffer from heat generation, saturation of magnetic flux, and poor initial permeability, leading to instability in acceleration gap voltage, especially in low-frequency regions, and the use of Fe-based magnetic alloys with fine crystal structures results in corrugated wrinkles and stress deterioration.
Innovation Solution
A high-frequency acceleration cavity core made of Fe-based magnetic ribbon with a controlled space factor of 40% to 59% and average crystal grain size of 1 μm or less, combined with an insulating layer and gap portions, to stabilize the magnetic characteristics and prevent corrugated wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If ferrite core is used in high-frequency acceleration cavity, then magnetic flux can be generated, but heat generation is large and initial permeability is small
Solution Approach 1:
The patent changes the material parameters by using Fe-based amorphous alloy ribbon instead of conventional ferrite core. This material substitution fundamentally alters the magnetic properties, achieving both low heat generation and high initial permeability. The amorphous structure with specific composition (Fe-Cu-Si-B alloy) provides superior magnetic characteristics compared to traditional ferrite materials.
Solution Approach 2:
The patent employs a composite structure consisting of Fe-based amorphous alloy ribbon wound in a toroidal configuration. The composite nature of the alloy itself (multiple elements Fe, Cu, Si, B) creates a material with optimized magnetic properties that balances low loss and high permeability, resolving the contradiction between heat generation and initial permeability.
2Loss of energy
If Fe-based magnetic alloy with fine crystal structure is used, then heat generation is suppressed and initial permeability is improved, but corrugated wrinkles and stress deterioration occur
Solution Approach 1:
The patent applies preliminary heat treatment to the Fe-based amorphous alloy ribbon before winding it into the toroidal core structure. This pre-treatment process stabilizes the material's crystal structure and reduces internal stresses, preventing the formation of corrugated wrinkles and stress deterioration that would otherwise occur during subsequent assembly and operation.
Solution Approach 2:
The patent incorporates insulation layers between the wound magnetic ribbon turns to cushion and distribute mechanical stresses uniformly. This protective measure prevents stress concentration that leads to wrinkle formation and maintains the structural integrity of the core under operational conditions.
3Reliability
If high voltage is applied to stabilize acceleration gap voltage, then acceleration stability is improved, but heat generation of magnetic core increases
Solution Approach 1:
The patent changes the magnetic core material parameters by using Fe-based amorphous alloy with superior magnetic properties. This material has higher initial permeability and lower core losses, allowing the system to operate at high voltages for stable acceleration while generating less heat compared to conventional ferrite cores. The material parameter change enables simultaneous achievement of both goals.
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 solution enables stable impedance matching and increased acceleration gap voltage across a wide frequency range, reducing the need for large cooling facilities and heat treatment equipment, while maintaining high magnetic permeability and preventing stress deterioration.
Implementation Method 1
a magnetic core is used to generate a high-frequency electric field
Implementation Method 2
The magnetic core using the Fe-based magnetic ribbon having a fine crystal structure is able to suppress heat generation as compared with the ferrite core
Data Source
AI summary
A high-frequency acceleration cavity core is a toroidal core obtained by winding an Fe-based magnetic ribbon having crystals with an average crystal grain size of 1 μm or less, in which a space factor of the Fe-based magnetic ribbon is 40% or more and 59% or less, and a μQf value at 1 MHz is 3×109 Hz or more. The average crystal grain size is preferably 0.1 μm or less. The toroidal core preferably has a portion having a gap portion from an inner diameter to an outer diameter.