Stellarator Magnet Using Cubic Permanent Magnet Blocks
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Solution Overview
Problem
The complexity and high cost of manufacturing traditional stellarator magnet coils pose challenges in machining and installation, and existing permanent magnet designs with varied magnetization directions and shapes complicate the generation of a toroidal closed magnetic field configuration.
Innovation Solution
A stellarator magnet based on cubic permanent magnet blocks with uniform magnetization and fixed magnetization directions, arranged in a grid-like structure outside the vacuum vessel, utilizing planar coils to generate a toroidal magnetic field, and employing optimization methods like 'local compensation' and 'global fine-tuning' to achieve the required magnetic field configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional magnet coils are used to generate toroidal and poloidal magnetic fields, then the magnetic field configuration can be achieved, but the geometric shape becomes very complex, increasing machining difficulty and manufacturing cost
Solution Approach 1:
The patent divides the continuous magnetization distribution into discrete cubic permanent magnet blocks arranged in a grid pattern. Each block is a simple cube shape with uniform magnetization, replacing the complex continuous coil structure while achieving the required magnetic field configuration through discrete segmentation
Solution Approach 2:
The patent assigns different magnetization directions to different cubic blocks based on their spatial positions. Each block's magnetization direction is optimized locally to contribute to the overall toroidal and poloidal field requirements, allowing simple cubic shapes to achieve complex field configurations through spatial variation in magnetization properties
2Measurement precision
If permanent magnets with varied magnetization directions and shapes are used, then the magnetic field accuracy can be improved, but the manufacturing complexity and resource consumption increase
Solution Approach 1:
The patent changes the magnetization direction parameter for each cubic block based on its position in the grid. Instead of using magnets with varied shapes and complex magnetization patterns, the solution maintains uniform cubic geometry and achieves field accuracy by systematically varying the magnetization direction parameter across different spatial locations
Solution Approach 2:
The patent uses identical cubic permanent magnet blocks for all positions in the arrangement. These universal cubic blocks can be manufactured using the same process and then differentiated only by their magnetization direction, which is adjusted according to position to achieve the required magnetic field configuration, reducing manufacturing complexity while maintaining field accuracy
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
This solution simplifies the manufacturing and installation of stellarator magnets by using identical cubic blocks with reduced complexity, achieving high accuracy in magnetic field generation while minimizing resource consumption and computational complexity.
Implementation Method 1
A permanent magnet is a magnet that can be magnetized by an external magnetic field to generate a dipole magnetic field
Implementation Method 2
The toroidal spiral magnetic field is generated by external magnets
Implementation Method 3
if toroidal magnetic fields are generated by planar coils, a normal magnetic field component will be generated on the magnetic surface
Data Source
AI summary
The present disclosure provides a stellarator magnet based on cubic permanent magnet blocks and an arrangement optimization method thereof. For the characteristic that a three-dimensional magnet coil of a stellarator is complex in structure, the present disclosure provides the stellarator magnet based on the cubic permanent magnet blocks with uniform magnetization, same magnetization and same size; the magnetization directions of the cubic permanent magnet blocks are defined in a limited number of fixed alternative directions; the magnetic field configuration of the stellarator is generated by dipole magnetic fields provided by the permanent magnet blocks and planar coils, so that the device complexity of the stellarator is reduced, and the difficulty and cost of the machining and installation of the magnet are reduced. The shape of the permanent magnet blocks can be replaced by other regular shapes, and the permanent magnet is still formed by the permanent magnet blocks with same shape, same size, uniform magnetization and same magnetization. For the magnet, the present disclosure provides a magnet arrangement optimization method of ‘local compensation’ and related optimization strategies of ‘threshold truncation,’‘global fine tuning,’ etc., for meeting different optimization requirements on accuracy of the magnetic fields, usage qualities of magnets, etc., and a magnetic field meeting designing requirements can be obtained.