Planar Stellarator Coil Layout for Simpler Plasma Confinement
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Solution Overview
Problem
Stellarators with complex 3D designs face challenges in cost, fabrication, integration, and control of the 3D magnetic field, making them difficult to design, fabricate, and maintain, and existing designs often require non-planar coils that are hard to implement and control effectively.
Innovation Solution
A stellarator design utilizing a plurality of planar encircling coils and planar shaping coils that encircle the plasma axis without interlocking, allowing for a simpler structure and improved control of the magnetic field, with the option of superconducting materials and control coils for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-planar electromagnetic coils with complex 3D curvature are used, then the stellarator can confine plasma effectively, but the design, fabrication, integration, and maintenance become extremely difficult
Solution Approach 1:
The coil system is divided into multiple independent planar coil modules, each with simple 2D geometry. These modular planar coils can be manufactured separately and assembled to form the complete magnetic field system, reducing individual component complexity while maintaining overall functionality
Solution Approach 2:
The invention transitions from 3D non-planar coil geometry to 2D planar coil geometry. By using multiple planar coils arranged in specific configurations, the system achieves the necessary 3D magnetic field topology through dimensional reduction of individual coil elements
2Reliability
If electromagnetic coils are designed to interlock like chain links, then the magnetic field topology is achieved, but the coils cannot be fabricated separately and must be made together, increasing fabrication difficulty
Solution Approach 1:
The interlocking coil system is segmented into independent planar coil units that do not physically interlock. Each coil can be manufactured as a separate component using standard fabrication techniques, then assembled into the final configuration to achieve the required magnetic field topology
Solution Approach 2:
Instead of interlocking in 3D space, the coils are arranged in planar configurations that achieve the same magnetic field effects through 2D positioning and orientation, eliminating the need for complex interlocking joints
3Duration of action of stationary object
If helical coils that interlock plasma and other coils are used, then steady-state operation is achieved, but the coils must be wound with electrical wire on-site, increasing complexity
Solution Approach 1:
The helical coil system is replaced with modular planar coil segments that can be pre-manufactured and assembled. This segmentation allows for off-site fabrication and simplifies on-site assembly while maintaining steady-state operational capability
Solution Approach 2:
Instead of winding complex helical coils on-site, the invention uses pre-fabricated planar coils with simple geometries that can be manufactured using conventional techniques and assembled in the desired configuration, inverting the traditional approach to coil construction
4Reliability
If planar trim coils are positioned on the outboard side away from the center, then field correction is achieved, but the coils become larger in size, almost the size of the major radius
Solution Approach 1:
The trim coil system uses localized planar coils positioned strategically around the plasma cross-section. Each coil provides localized field correction in its specific region, achieving overall field control without requiring large outboard-positioned coils spanning the entire major radius
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 design simplifies the stellarator structure, reduces complexity, and enhances control over the magnetic field, making it easier to manufacture, integrate, and maintain, while potentially improving plasma confinement and fusion performance.
Implementation Method 1
Magnetic fusion devices aim to confine a fusing plasma using magnetic fields
Implementation Method 2
A stellarator comprises a field shaping coil system including one or more field shaping units that define a void adapted to confine a plasma
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.