Landau resonant modification of multiple kink mode contributions to 3D tokamak equilibria

J. D. King; E. J. Strait; N. M. Ferraro; J. M. Hanson; S. R. Haskey; M. J. Lanctot; Y. Q. Liu; N. Logan; C. Paz-Soldan; D. Shiraki; A. D. Turnbull

doi:10.1088/0029-5515/56/1/014003

Landau resonant modification of multiple kink mode contributions to 3D tokamak equilibria

J. D. King, E. J. Strait, N. M. Ferraro, J. M. Hanson, S. R. Haskey, M. J. Lanctot, Y. Q. Liu, N. Logan, C. Paz-Soldan, D. Shiraki, A. D. Turnbull

Advanced Tokamak Physics

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Detailed measurements of the plasma's response to applied magnetic perturbations provide experimental evidence that the form of three-dimensional (3D) tokamak equilibria, with toroidal mode number n = 1, is determined by multiple stable kink modes at high-pressure. For pressures greater than the ideal magnetohydrodynamic (MHD) stability limit, as calculated without a stabilizing wall, the 3D structure transitions in a way that is qualitatively predicted by an extended MHD model that includes kinetic wave-particle interactions. These changes in poloidal mode structure are correlated with the proximity of rotation profiles to thermal ion bounce and the precession drift frequencies suggesting that these kinetic resonances are modifying the relative amplitudes of the stable modes. These results imply that each kink may eventually be independently controlled.

Original language	English
Article number	014003
Journal	Nuclear Fusion
Volume	56
Issue number	1
DOIs	https://doi.org/10.1088/0029-5515/56/1/014003
State	Published - Dec 17 2016

Keywords

equilibrium
kinetic effects
kinks
magnetohydrodynamics
tokamaks

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10.1088/0029-5515/56/1/014003

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title = "Landau resonant modification of multiple kink mode contributions to 3D tokamak equilibria",

abstract = "Detailed measurements of the plasma's response to applied magnetic perturbations provide experimental evidence that the form of three-dimensional (3D) tokamak equilibria, with toroidal mode number n = 1, is determined by multiple stable kink modes at high-pressure. For pressures greater than the ideal magnetohydrodynamic (MHD) stability limit, as calculated without a stabilizing wall, the 3D structure transitions in a way that is qualitatively predicted by an extended MHD model that includes kinetic wave-particle interactions. These changes in poloidal mode structure are correlated with the proximity of rotation profiles to thermal ion bounce and the precession drift frequencies suggesting that these kinetic resonances are modifying the relative amplitudes of the stable modes. These results imply that each kink may eventually be independently controlled.",

keywords = "equilibrium, kinetic effects, kinks, magnetohydrodynamics, tokamaks",

author = "King, {J. D.} and Strait, {E. J.} and Ferraro, {N. M.} and Hanson, {J. M.} and Haskey, {S. R.} and Lanctot, {M. J.} and Liu, {Y. Q.} and N. Logan and C. Paz-Soldan and D. Shiraki and Turnbull, {A. D.}",

note = "Publisher Copyright: {\textcopyright} 2016 IAEA, Vienna.",

year = "2016",

month = dec,

day = "17",

doi = "10.1088/0029-5515/56/1/014003",

language = "English",

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T1 - Landau resonant modification of multiple kink mode contributions to 3D tokamak equilibria

AU - King, J. D.

AU - Strait, E. J.

AU - Ferraro, N. M.

AU - Hanson, J. M.

AU - Haskey, S. R.

AU - Lanctot, M. J.

AU - Liu, Y. Q.

AU - Logan, N.

AU - Paz-Soldan, C.

AU - Shiraki, D.

AU - Turnbull, A. D.

PY - 2016/12/17

Y1 - 2016/12/17

N2 - Detailed measurements of the plasma's response to applied magnetic perturbations provide experimental evidence that the form of three-dimensional (3D) tokamak equilibria, with toroidal mode number n = 1, is determined by multiple stable kink modes at high-pressure. For pressures greater than the ideal magnetohydrodynamic (MHD) stability limit, as calculated without a stabilizing wall, the 3D structure transitions in a way that is qualitatively predicted by an extended MHD model that includes kinetic wave-particle interactions. These changes in poloidal mode structure are correlated with the proximity of rotation profiles to thermal ion bounce and the precession drift frequencies suggesting that these kinetic resonances are modifying the relative amplitudes of the stable modes. These results imply that each kink may eventually be independently controlled.

AB - Detailed measurements of the plasma's response to applied magnetic perturbations provide experimental evidence that the form of three-dimensional (3D) tokamak equilibria, with toroidal mode number n = 1, is determined by multiple stable kink modes at high-pressure. For pressures greater than the ideal magnetohydrodynamic (MHD) stability limit, as calculated without a stabilizing wall, the 3D structure transitions in a way that is qualitatively predicted by an extended MHD model that includes kinetic wave-particle interactions. These changes in poloidal mode structure are correlated with the proximity of rotation profiles to thermal ion bounce and the precession drift frequencies suggesting that these kinetic resonances are modifying the relative amplitudes of the stable modes. These results imply that each kink may eventually be independently controlled.

KW - equilibrium

KW - kinetic effects

KW - kinks

KW - magnetohydrodynamics

KW - tokamaks

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SN - 0029-5515

VL - 56

JO - Nuclear Fusion

JF - Nuclear Fusion

IS - 1

M1 - 014003

ER -

Landau resonant modification of multiple kink mode contributions to 3D tokamak equilibria

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Keywords

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