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physics.plasm-ph2025
Conefield approach to identifying regions without flux surfaces for magnetic fields
David Martinez-del-Rio, Robert S. MacKay
The conefield variant of a Converse KAM method for 3D vector fields, identifying regions through which no invariant 2-tori pass transverse to a specified direction field, is tested…
physics.plasm-ph2025
Invariant tori for the pressure-jump Hamiltonian
Robert S. MacKay
A major achievement of Dewar and coworkers is the SPEC code to construct stepped-pressure equilibria in magnetohydrostatics without axisymmetry. Their existence had been proved by…
physics.plasm-ph2024
Characterization of admissible quasisymmetries
J. W. Burby, N. Kallinikos, R. S. MacKay +2
We solve "half" the problem of finding three-dimensional quasisymmetric magnetic fields that do not necessarily satisfy force balance. This involves determining which hidden symmet…