Planar Coil Stellarator Architecture for Modular Field Shaping
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Solution Overview
Problem
Stellarator designs with complex, non-planar electromagnetic coils face challenges in fabrication, integration, and maintenance, leading to increased costs and difficulty in controlling the magnetic field distribution.
Innovation Solution
A stellarator design utilizing a plurality of planar encircling coils and planar shaping coils that do not interlock with each other or the plasma, allowing for a simpler structure and improved control of the magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-planar electromagnetic coils with complex 3D curvature are used in stellarator designs, then the magnetic field topology can be achieved, but the fabrication, integration, and maintenance difficulty increases significantly
Solution Approach 1:
The coil system is divided into multiple planar coil modules, each with simple 2D geometry. These modular planar coils can be independently fabricated and then assembled to create the complex 3D magnetic field topology, resolving the contradiction between achieving complex field topology and simplifying individual coil fabrication
Solution Approach 2:
The invention transitions from using coils in three-dimensional space (3D curvature) to using multiple two-dimensional planar coils arranged in specific configurations. By adding the spatial arrangement dimension, the complex 3D magnetic topology is achieved through the collective effect of simple planar coils rather than individual complex coils
2Strength
If electromagnetic coils are designed to interlock like chain links, then the structural integrity is improved, but the fabrication complexity increases as they must be manufactured together
Solution Approach 1:
The interlocking coil structure is segmented into independent planar coil modules that do not physically interlock. Each module can be fabricated separately using standard manufacturing processes, then assembled through simpler mechanical or magnetic coupling methods, reducing both fabrication and assembly complexity while maintaining structural integrity
Solution Approach 2:
Instead of interlocking in the same plane or 3D space, the planar coils are arranged in multiple layers or spatial positions. The structural integrity is achieved through their spatial configuration and collective magnetic field interaction rather than physical interlocking, simplifying both fabrication and assembly
3Reliability
If complex non-planar coils are used to confine plasma, then the plasma confinement performance is achieved, but the cost and maintenance difficulty increase
Solution Approach 1:
The plasma confinement system uses multiple independent planar coil modules rather than a single complex non-planar coil. If one module requires maintenance or replacement, only that specific module needs to be accessed and serviced, while the others remain operational, significantly reducing maintenance difficulty and downtime
Solution Approach 2:
The complex 3D curvature function is extracted from the individual coil geometry and instead achieved through the spatial arrangement and collective operation of multiple simple planar coils. This extraction simplifies each individual coil to a maintainable planar structure while preserving the overall plasma confinement performance
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 design simplifies fabrication and maintenance while enhancing magnetic field control, reducing complexity and costs compared to prior stellarator designs.
Implementation Method 1
Magnetic fusion devices aim to confine a fusing plasma using magnetic fields
Implementation Method 2
one or more planar coils which encircle the field-shaping coil system
Data Source
AI summary
Disclosed herein is a stellarator comprising two sets of coils, namely a set of encircling coils which encircle the plasma axis, and a set of shaping coils which do not encircle any other coil or the plasma. In some embodiments, the encircling coils include a structural element to maintain their shape under magnetic forces. In some embodiments, the shaping coils are mounted onto one or more structural elements which, together with the shaping coils, constitute a field shaping unit. Also disclosed is a controller which may modify the electrical current flowing in one or more subsets of the coils in order to achieve target plasma parameters. Also disclosed is a method of designing a set of shaping coils by discretizing a surface dipole or current potential distribution.