Electron Beam Diffusion Section Using Permanent Magnets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electron beam diffusion devices for irradiation processing face challenges such as high power consumption, inability to uniformly irradiate large heterogeneous products, and un-uniformity of irradiation dose due to scanning methods, which limits the longitudinal size of the electron beam to 30 mm, exceeding the size of conventional titanium windows.
Innovation Solution
A device utilizing two groups of permanent magnets to compress the electron beam longitudinally to approximately 80 mm, with the first group forming an elliptical magnetic field and the second group reshaping the beam into a rectangular field, allowing for synchronous movement and adjustment to achieve uniform diffusion and compression, eliminating the need for electric power and modifying existing equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a scanning magnet is used to diffuse the electron beam, then the electron beam can be scanned across the product, but it consumes electric power and cannot uniformly irradiate large heterogeneous products
Solution Approach 1:
The patent replaces the electromagnetic scanning magnet system with a purely mechanical magnetic diffusion structure using permanent magnets arranged in alternating polarity patterns. This mechanical arrangement creates a diffusion magnetic field that spreads the electron beam without requiring electrical power for scanning, thereby eliminating power consumption while maintaining uniform irradiation capability across large products.
Solution Approach 2:
The permanent magnets in the diffusion section generate their own magnetic field without external power supply, making the system self-sufficient. The alternating polarity arrangement of permanent magnets automatically creates the diffusion effect, eliminating the need for powered scanning mechanisms and enabling uniform irradiation of large heterogeneous products without consuming electric power.
2Manufacturing precision
If a scanning magnet is used to diffuse the electron beam, then the electron beam can be scanned, but flyback and improper cooperation between travel speed and scanning frequency cause un-uniformity of irradiation dose
Solution Approach 1:
The patent eliminates the electromagnetic scanning mechanism that causes flyback and synchronization problems by using a static arrangement of permanent magnets with alternating polarities. This mechanical magnetic field structure diffuses the electron beam without scanning motion, completely removing flyback effects and eliminating the need for coordinating travel speed with scanning frequency, thereby achieving uniform irradiation dose distribution.
3Area of stationary object
If the longitudinal size of the electron beam is increased to broaden the beam, then the irradiation area is increased, but the longitudinal size exceeds the size of conventional titanium windows
Solution Approach 1:
The patent applies different magnetic field characteristics to different sections: the diffusion section uses alternating polarity permanent magnets to spread the beam laterally for increased area, while the compression section uses specifically configured permanent magnets to reduce the longitudinal dimension. This localized differentiation of magnetic field properties enables the beam to have large lateral dimensions for broad irradiation area while maintaining small longitudinal dimensions that fit within conventional titanium window size limits.
Solution Approach 2:
The patent divides the magnetic field system into distinct functional sections: a diffusion section with alternating polarity permanent magnets that expands the beam laterally, and a compression section with configured permanent magnets that reduces the longitudinal dimension. This segmentation allows independent optimization of lateral spread and longitudinal compression, achieving large irradiation area while keeping the longitudinal size within titanium window constraints.
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 ensures optimal irradiation uniformity and efficiency, allowing the electron beam to fit within conventional titanium window sizes, reducing power consumption, and preventing product damage by eliminating flyback, thus enhancing processing quality and equipment compatibility.
Implementation Method 1
a magnetic field formed by the four magnetic poles extending the electron beam in a longitudinal direction, and compressing the electron beam in a transverse direction
Implementation Method 2
a magnetic field formed by the eight magnetic poles optimizing an edge of a dispersed electron-beam bunch into an approximate rectangle
Implementation Method 3
by controlling the four longitudinal connection mechanisms so that the upper magnetic yoke and the lower magnetic yoke of the first group of permanent magnets move synchronously towards the center thereof thereby longitudinally compressing the electron beam
Data Source
AI summary
Provided is a device for optimizing a diffusion section of an electron beam, comprising two groups of permanent magnets, a magnetic field formed by the four magnetic poles extending the electron beam in a longitudinal direction, and compressing the electron beam in a transverse direction, so that the electron beam becomes an approximate ellipse; another magnetic field formed by the eight magnetic poles optimizing an edge of a dispersed electron-beam bunch into an approximate rectangle; by controlling the four longitudinal connection mechanisms so that the upper magnetic yoke and the lower magnetic yoke of the first group of permanent magnets move synchronously towards the center thereof thereby longitudinally compressing the electron beam in the shape of an approximate ellipse, and the upper magnetic yoke and the lower magnetic yoke of the second group of permanent magnets move synchronously towards the center thereof thereby longitudinally compressing the electron beam in the shape of an approximate rectangle, and the process of longitudinal compression is repeated until a longitudinal size of the electron-beam bunch is reduced to 80 mm. The invention is capable of reasonably compressing a longitudinal size of an electron-beam bunch after diffusion to approximately 80 mm, which ensures optimum irradiation uniformity and efficiency, and enables the longitudinal size to be within the range of a conventional titanium window.