Extending near-axis equilibria in DESC
Abstract
The near-axis description of optimised stellarator fields has proven to be a powerful tool both for design and understanding of this magnetic confinement concept. The description consists of an asymptotic model of the equilibrium in the distance from its centermost axis, and is thus only approximate. Any practical application therefore requires the eventual construction of a global equilibrium. This paper presents a novel way of constructing global equilibria using the \texttt{DESC} code that guarantees the correct asymptotic behaviour imposed by a given near-axis construction. The theoretical underpinnings of this construction are carefully presented, and benchmarking examples provided. This opens the door to an efficient coupling of the near-axis framework and that of global equilibria for future optimisation efforts.
Cite
@article{arxiv.2506.05170,
title = {Extending near-axis equilibria in DESC},
author = {Dario Panici and Eduardo Rodriguez and Rory Conlin and Daniel Dudt and Egemen Kolemen},
journal= {arXiv preprint arXiv:2506.05170},
year = {2025}
}
Comments
30 pages, 7 figures