Quasisymmetric stellarator magnetic fields are generated by periodic KdV soliton potentials, with B approaching the 1-soliton reflectionless form near the outermost surface.
We also need to keep both the scales y, Y in ∇2 ⊥, ∇2 ⊥ → ∂2 x + (∂y + ϵ∂Y )2 = ∇2 ⊥ + 2ϵ∂Y ∂y + ϵ2∂2 Y (B16) Finally, we note that (B15) has to be evaluated at z = 1 + ϵη
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Periodic Korteweg-de Vries soliton potentials generate quasisymmetric magnetic fields
Quasisymmetric stellarator magnetic fields are generated by periodic KdV soliton potentials, with B approaching the 1-soliton reflectionless form near the outermost surface.