Saturated ideal kink/peeling formations described as three-dimensional magnetohydrodynamic tokamak equilibrium states

W. A. Cooper, D. Brunetti, B. P. Duval, J. M. Faustin, J. P. Graves, A. Kleiner, H. Patten, D. Pfefferlé, L. Porte, M. Raghunathan, H. Reimerdes, O. Sauter, T. M. Tran

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8 Citations (Scopus)

Abstract

Free boundary magnetohydrodynamic equilibrium states with spontaneous three dimensional deformations of the plasma-vacuum interface are computed for the first time. The structures obtained have the appearance of saturated ideal external kink/peeling modes. High edge pressure gradients yield toroidal mode number n = 1 corrugations for a high edge bootstrap current and larger n distortions when this current is small. Deformations in the plasma boundary region induce a nonaxisymmetric Pfirsch-Schlüter current driving a field-aligned current ribbon consistent with reported experimental observations. A variation in the 3D equilibrium confirms that the n = 1 mode is a kink/peeling structure. We surmise that our calculated equilibrium structures constitute a viable model for the edge harmonic oscillations and outer modes associated with a quiescent H-mode operation in shaped tokamak plasmas.

Original languageEnglish
Article number040701
JournalPhysics of Plasmas
Volume23
Issue number4
DOIs
Publication statusPublished - 1 Apr 2016
Externally publishedYes

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