Stellarator nonlinearly saturated periodicity-breaking ideal magnetohydrodynamic equilibrium states

The relaxation of the constraint of periodicity imposed by the external confining magnetic field coils in a nominally 4-field period Helias Advanced Stellarator configuration produces weak periodicity-breaking deformations of the plasma. The corrugations are driven by the interaction of the pressure gradient with the magnetic field line curvature and correspond to saturated ideal magnetohydrodynamic interchanges with a mode structure dominated by nonresonant $m=1,n=\pm 1$ Fourier components. The conditions of quasi-isodynamicity of the Helias reactor system investigated are not significantly altered by the periodicity-breaking distortions.


Published in:
Nuclear Fusion, 58, 12, 124002
Year:
Sep 20 2018
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 Record created 2018-09-21, last modified 2019-10-07

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