Modeling non-planar coils in a full-scale stellarator

TL;DR

This paper presents a 3D modeling approach for non-planar stellarator coils, enabling accurate analysis of magnetic fields and forces crucial for design, and facilitating data generation for optimization workflows.

Contribution

The work introduces a three-dimensional model for complex coil geometries in stellarators, improving analysis accuracy over 2D methods and supporting integration with optimization tools.

Findings

Enables accurate magnetic field and force analysis of non-planar coils.

Facilitates rapid generation of critical data for coil design optimization.

Supports integration with machine learning and advanced optimization workflows.

Abstract

Design and modeling of a stellarator fusion reactor is a multidisciplinary effort that requires a tight integration between simulation of highly nonlinear multi-physics and representation of non-planar complex geometries. The critical current calculation and the design of the mechanical structures are among the most crucial aspects as they set size, cost, and time to build the stellarator. Because of the asymmetric and non-planar nature of its components the modeling of such figures of merit needs to be carried out at large scale, without the possibility of taking advantage of any particular symmetry. In this work we develop a three-dimensional model for the analysis of the magnetic field and forces, necessary for such considerations, for complex coil geometries, such as stellarators, where a two-dimensional approach can not provide accurate analyses and verification of assumptions. Moreover, this method can quickly generate a large amount of critical modeling data (e.g. Lorentz load, displacement and stresses) that could be integrated into a workflow for coil design optimization based on machine learning or other recent optimization tools.