Estimating coil features from an equilibrium
arXiv:2604.12339
The paper introduces a theoretical method to design artificial modular coils for stellarators directly from equilibrium magnetic field properties, using a current potential on flux surfaces and interpreting constant Boozer toroidal angle contours as proxy coils.
Abstract
We present an explicit theoretical framework for constructing artificial modular coils for vacuum stellarator fields based solely on equilibrium properties, achieved through the formulation of a current potential defined on flux surfaces. Contours of constant Boozer toroidal angle can be directly interpreted as proxy coils, and so we demonstrate that key measures of coil complexity (particularly coil non-planarity) are strongly governed by local magnetic field properties. This approach shows promise as predictor for more realistic coil configurations, providing both a pathway towards deeper understanding of equilibrium-coil relationships and a potential practical proxy for coil design.