Magnetic fields with general omnigenity

Daniel W. Dudt, Alan G. Goodman, Rory Conlin, Dario Panici, Egemen Kolemen

Research output: Contribution to journalArticlepeer-review


Omnigenity is a desirable property of toroidal magnetic fields that ensures confinement of trapped particles. Confining charged particles is a basic requirement for any fusion power plant design, but it can be difficult to satisfy with the non-Axisymmetric magnetic fields used by the stellarator approach. Every ideal magnetohydrodynamic equilibrium previously found to approximate omnigenity has been either axisymmetric, quasi-symmetric or has poloidally closed contours of magnetic field strength. However, general omnigenous equilibria are a much larger design space than these subsets. A new model is presented and employed in the DESC stellarator optimization suite to represent and discover the full parameter space of omnigenous equilibria. Although exact omnigenity aside from quasi-symmetry is impossible, these results reveal that excellent particle confinement can be achieved in practice. Examples far from quasi-symmetry with poloidally, helically and toroidally closed contours are attained with DESC and shown to have low neoclassical collisional transport and fast particle losses.

Original languageEnglish (US)
Article number905900120
JournalJournal of Plasma Physics
Issue number1
StatePublished - Feb 27 2024

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


  • fusion plasma
  • plasma confinement


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