2023
DOI: 10.1063/5.0146487
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How well can VMEC predict the initial saturation of external kink modes in near circular tokamaks and l= 2 stellarators?

Abstract: The equilibrium code, VMEC, is used to study external kinks in low β tokamaks and l = 2 stellarators. The applicability of the code when modeling nonlinear MHD effects is explored in an attempt to understand and predict how the initial saturation of the MHD mode depends on the external rotational transform. It is shown that helicity preserving, free boundary VMEC computations do not converge to a single perturbed solution with increasing spectral resolution. Additional constraints are applied to narrow down th… Show more

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