Ridges in quasisymmetric stellarators are field-line caustics arising from the eikonal equation, and filamentary coils must lie on the zero-determinant manifold of the magnetic gradient tensor.
E.1998 Helical post stellarator.Plasma physics and controlled fusion40(6),
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Optical analogy for stellarators: Ridges as caustics and coils as singularities
Ridges in quasisymmetric stellarators are field-line caustics arising from the eikonal equation, and filamentary coils must lie on the zero-determinant manifold of the magnetic gradient tensor.