Fast Ion Induced Shearing of 2D Alfvén Eigenmodes Measured by Electron Cyclotron Emission Imaging

2011105 citationsJournal Articlegreen Open Access

Authors

Benjamin Tobias · University of California, Davis

I. G. J. Classen · Institute for Atomic and Molecular Physics

C. W. Domier · University of California, Davis

W. W. Heidbrink · University of California, Irvine

Neville C. Luhmann · University of California, Davis

R. Nazikian · Princeton Plasma Physics Laboratory

Hyung Kyu Park

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.

Topics & Keywords

Magnetic confinement fusion research Ionosphere and magnetosphere dynamics Solar and Space Plasma Dynamics

Publication Details

Published in: Physical Review Letters

Volume 106, Issue 7, pp. 075003-075003

DOI: 10.1103/physrevlett.106.075003

Field-Weighted Citation Impact: 19.48

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Fast Ion Induced Shearing of 2D Alfvén Eigenmodes Measured by Electron Cyclotron Emission Imaging

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Abstract

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Publication Details