Fast ion induced shearing of 2D Alfvén eigenmodes measured by electron cyclotron emission imaging

B. J. Tobias; I. G.J. Classen; C. W. Domier; W. W. Heidbrink; N. C. Luhmann; R. Nazikian; H. K. Park; D. A. Spong; M. A. Van Zeeland

doi:10.1103/PhysRevLett.106.075003

Fast ion induced shearing of 2D Alfvén eigenmodes measured by electron cyclotron emission imaging

B. J. Tobias, I. G.J. Classen, C. W. Domier, W. W. Heidbrink, N. C. Luhmann, R. Nazikian, H. K. Park, D. A. Spong, M. A. Van Zeeland

Plasma Theory and Modeling

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

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Abstract

Two-dimensional images of electron temperature perturbations are obtained with electron cyclotron emission imaging (ECEI) on the DIII-D tokamak and compared to Alfvén eigenmode structures obtained by numerical modeling using both ideal MHD and hybrid MHD-gyrofluid codes. While many features of the observations are found to be in excellent agreement with simulations using an ideal MHD code (NOVA), other characteristics distinctly reveal the influence of fast ions on the mode structures. These features are found to be well described by the nonperturbative hybrid MHD-gyrofluid model TAEFL.

Original language	English
Article number	075003
Journal	Physical Review Letters
Volume	106
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevLett.106.075003
State	Published - Feb 16 2011

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title = "Fast ion induced shearing of 2D Alfv{\'e}n eigenmodes measured by electron cyclotron emission imaging",

abstract = "Two-dimensional images of electron temperature perturbations are obtained with electron cyclotron emission imaging (ECEI) on the DIII-D tokamak and compared to Alfv{\'e}n eigenmode structures obtained by numerical modeling using both ideal MHD and hybrid MHD-gyrofluid codes. While many features of the observations are found to be in excellent agreement with simulations using an ideal MHD code (NOVA), other characteristics distinctly reveal the influence of fast ions on the mode structures. These features are found to be well described by the nonperturbative hybrid MHD-gyrofluid model TAEFL.",

author = "Tobias, {B. J.} and Classen, {I. G.J.} and Domier, {C. W.} and Heidbrink, {W. W.} and Luhmann, {N. C.} and R. Nazikian and Park, {H. K.} and Spong, {D. A.} and {Van Zeeland}, {M. A.}",

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doi = "10.1103/PhysRevLett.106.075003",

language = "English",

volume = "106",

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T1 - Fast ion induced shearing of 2D Alfvén eigenmodes measured by electron cyclotron emission imaging

AU - Tobias, B. J.

AU - Classen, I. G.J.

AU - Domier, C. W.

AU - Heidbrink, W. W.

AU - Luhmann, N. C.

AU - Nazikian, R.

AU - Park, H. K.

AU - Spong, D. A.

AU - Van Zeeland, M. A.

PY - 2011/2/16

Y1 - 2011/2/16

N2 - Two-dimensional images of electron temperature perturbations are obtained with electron cyclotron emission imaging (ECEI) on the DIII-D tokamak and compared to Alfvén eigenmode structures obtained by numerical modeling using both ideal MHD and hybrid MHD-gyrofluid codes. While many features of the observations are found to be in excellent agreement with simulations using an ideal MHD code (NOVA), other characteristics distinctly reveal the influence of fast ions on the mode structures. These features are found to be well described by the nonperturbative hybrid MHD-gyrofluid model TAEFL.

AB - Two-dimensional images of electron temperature perturbations are obtained with electron cyclotron emission imaging (ECEI) on the DIII-D tokamak and compared to Alfvén eigenmode structures obtained by numerical modeling using both ideal MHD and hybrid MHD-gyrofluid codes. While many features of the observations are found to be in excellent agreement with simulations using an ideal MHD code (NOVA), other characteristics distinctly reveal the influence of fast ions on the mode structures. These features are found to be well described by the nonperturbative hybrid MHD-gyrofluid model TAEFL.

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U2 - 10.1103/PhysRevLett.106.075003

DO - 10.1103/PhysRevLett.106.075003

M3 - Article

AN - SCOPUS:79951595766

SN - 0031-9007

VL - 106

JO - Physical Review Letters

JF - Physical Review Letters

IS - 7

M1 - 075003

ER -

Fast ion induced shearing of 2D Alfvén eigenmodes measured by electron cyclotron emission imaging

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