Theoretical investigation of the triggering of neoclassical tearing modes by transient resonant magnetic perturbations in NSTX

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چکیده

The extended perturbed equilibrium code asymptotic matching is used to simulate the triggering of n = 1 neoclassical tearing modes (NTMs) by a pulsed, rotating, 1, resonant magnetic perturbation (RMP) in two example NSTX discharges. Although discharges are significantly different from one another, results sets simulations quite similar. critical RMP pulse amplitude required trigger an NTM minimized when rotation frequency matches linear natural mode, within plasma, that metastable NTM. However, if there mismatch, then seed island chain driven at relevant surface forced rotate with respect RMP, because nowhere near sufficient lock RMP. This causes oscillate as duration varied. such executes half-integer number rotations pulse. All minima have same value.

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ژورنال

عنوان ژورنال: Physics of Plasmas

سال: 2023

ISSN: ['1070-664X', '1527-2419', '1089-7674']

DOI: https://doi.org/10.1063/5.0155038