Self-Holding Undulator Magnet Structure for Stable Short-Period Assembly
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Solution Overview
Problem
Existing undulators face challenges in maintaining the assembly of permanent magnets due to magnetic repulsion and instability, particularly in short-period configurations, necessitating the use of glue or welding, which limits flexibility and efficiency.
Innovation Solution
A magnet structure with a specific arrangement of permanent magnets, where each magnet has non-zero components along multiple axes, facilitating stable assembly without the need for glue or welding, and enabling efficient generation of magnetic fields for elliptical polarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If permanent magnets are assembled in a classical Halbach structure with each magnet magnetized in at most 1 direction, then the structure is simple to manufacture, but the magnets are difficult to maintain in position due to magnetic repulsion and unstable equilibrium
Solution Approach 1:
The patent changes the magnetization parameter from single-direction (0 or 90 degrees) to multi-directional configurations (45, 135, 225, 315 degrees). This parameter change allows magnets to have non-zero components along both horizontal and vertical axes, creating stable magnetic interactions that maintain position while preserving manufacturing simplicity
Solution Approach 2:
The patent creates a composite magnetic structure where magnets with different magnetization orientations are combined in a specific pattern. This composite arrangement produces a synergistic effect where the magnetic fields of individual magnets reinforce each other, achieving stable equilibrium without requiring additional mechanical fastening
2Adaptability or versatility
If the longitudinal dimension of each magnet is reduced to λu/4 (as in APPLE I or X inverters), then the inverter can achieve equal horizontal and vertical field components, but the magnets become difficult to hold mechanically due to insufficient thickness
Solution Approach 1:
The patent converts the harmful magnetic repulsion force into a beneficial stabilizing mechanism. By orienting magnets at specific angles (45, 135, 225, 315 degrees), the repulsive forces between adjacent magnets create a stable equilibrium that actually helps maintain position, turning the mechanical holding problem into a self-stabilizing magnetic configuration
Solution Approach 2:
The magnet structure becomes self-holding through its own magnetic field configuration. The specific angular arrangement causes the magnets to naturally maintain their positions through magnetic interaction, eliminating the need for external mechanical fastening systems like glue, welds, or clamps
3Stability of the object's composition
If magnets are glued or welded together to maintain position, then the magnets can be held in place, but the flexibility and efficiency of the undulator are limited
Solution Approach 1:
The patent replaces the mechanical fastening system (glue, welds, clamps) with a magnetic field-based positioning system. The magnets are held in place through carefully designed magnetic interactions rather than physical constraints, allowing for greater flexibility in adjusting the undulator configuration and improving overall system efficiency
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 proposed magnet structure allows for stable assembly and efficient generation of magnetic fields with balanced horizontal and vertical components, enhancing the flexibility and performance of undulators.
Implementation Method 1
each series comprising: a magnet of a first beam, a magnet of a second beam, a magnet of a third beam, a magnet of a fourth beam... the magnetization vector of each magnet (of these at least 4 series) of each beam has a non-zero component along each of the directions X, S and Z
Data Source
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AI summary
The invention relates to a magnet structure comprising sets (1, 2, 3, 4) of permanent magnets installed periodically in a direction S with a spatial period λu, each set comprising a magnet of a first beam (10), a magnet of a second beam (20), a magnet of a third beam (30), and a magnet of a fourth beam (40), the magnets of each beam being arranged in succession in the direction S, the first beam and the second beam being arranged in succession in a direction Z perpendicular to the direction S, the fourth beam and the third beam being arranged in succession in the direction Z, the third beam and the second beam being arranged in succession in a direction X perpendicular to directions S and Z, and the fourth beam and the first beam being arranged in succession in the direction X, characterised in that, for at least four successive sets of magnets with a spatial period λu, the magnetisation vector of each magnet of each beam has a non-zero component in each of the directions X, S and Z.