Segmented Superconducting Magnet Coil Assembly
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Solution Overview
Problem
Conventional superconducting magnet coil structures face manufacturing defects such as electrical shorts and impregnation failures that are not apparent until after impregnation, leading to the scrapping of entire structures, and lack the ability to inspect and replace individual coils during assembly.
Innovation Solution
The method involves forming and impregnating individual coil units with thermosetting resin, using non-ferromagnetic rings for alignment and bonding, allowing for the inspection and replacement of defective coils, and adjusting their positions to achieve precise magnetic field homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If coils are wound and impregnated together in a conventional structure, then manufacturing process is simplified, but manufacturing defects cannot be detected until after impregnation causing entire structure to be scrapped
Solution Approach 1:
The magnet coil structure is divided into multiple separate coil units, each with its own cavity and impregnation system. This allows individual inspection and replacement of defective coils without scrapping the entire structure, resolving the contradiction between manufacturing simplicity and defect detection capability.
2Productivity
If multiple coils are impregnated simultaneously, then production time is reduced, but defective coils cannot be replaced individually
Solution Approach 1:
Each coil is provided with its own separate cavity and impregnation system, enabling independent processing and replacement. This segmentation allows high productivity through parallel impregnation while maintaining the ability to replace individual defective coils without affecting others.
Solution Approach 2:
The coil units are designed to be movable relative to each other during assembly and inspection, allowing defective coils to be removed and replaced individually. After assembly, the structure becomes fixed for operation, providing dynamic flexibility during manufacturing and repair phases.
3Strength
If coils are tightly bonded to achieve structural stability, then mechanical strength is improved, but adjustment of coil positions for magnetic field homogeneity becomes difficult
Solution Approach 1:
The coil units are initially positioned with adjustable freedom to achieve precise alignment for magnetic field homogeneity. Once positioned correctly, they are bonded to the former to provide structural stability, transitioning from a dynamic adjustable state to a fixed stable state.
Solution Approach 2:
Coil units are positioned and aligned on the former before bonding occurs. This preliminary positioning allows optimization of magnetic field homogeneity through adjustment, after which bonding locks the positions to provide structural stability for operation.
Data Source
AI summary
A cylindrical superconducting coil assembly has multiple individual coil units stacked together and retained in place by retaining structures, each coil unit having a resin-impregnated annular superconducting coil bonded at its axial extremities to respective rings of non-ferromagnetic material.