Quasi-axisymmetric magnetic fields: weakly non-axisymmetric case in a vacuum

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Ideal magnetohydrodynamic equilibrium in a non-symmetric topological torus

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Theory of plasma confinement in non-axisymmetric magnetic fields

(2014) Per Helander   REPORTS ON PROGRESS IN PHYSICS

Omnigenity as generalized quasisymmetry

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Nonaxisymmetric shaping of tokamaks preserving quasiaxisymmetry

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Stellarators and the path from ITER to DEMO

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