Pairing square-root-area-weighted vacuum perturbations with full-area-weighted resonant fields produces a coupling matrix whose singular values and reconstructed real-space patterns are invariant to coordinate choice.
Boozer, Non-axisymmetric magnetic fields and toroidal plasma confinement,Nucl
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Pfirsch-Schlüter current localizes within a stellarator half-period when dℓ/B is uniform across field lines on a surface, equivalent within 0.1% to uniform ℓ_p/2 travel distance.
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Coordinate-invariant flux-surface Fourier analysis in tokamaks
Pairing square-root-area-weighted vacuum perturbations with full-area-weighted resonant fields produces a coupling matrix whose singular values and reconstructed real-space patterns are invariant to coordinate choice.