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Author: Jacobo Varela
Requested Type: Poster
Submitted: 2017-04-03 16:39:30

Co-authors: D. Spong, L. Garcia

Contact Info:
Oak Ridge National Lab
790 Emory Valley Roaf Apt 122
Oak Ridge, TENNESSEE   37830
United States

Abstract Text:
The aim of this study is to analyze the destabilization of Alfven Eigenmodes (AE) by energetic particles (EP) during the operation of magnetic confinement devices using a global model. We use the reduced MHD equations to describe the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations of density and parallel velocity moments for the energetic particles, including the effect of the acoustic modes, finite
Larmor radius for ions and energetic particles as well as the Landau damping of electrons and ions. We add the Landau damping and resonant destabilization effects using a closure relation. We reproduce the TAE activity observed in LHD [Osakabe, M. et al, Nucl. Fusion, 46, S911, (2006)], the frequency sweeping evolution of the HAE frequency in TJII, he RSAE instabilities observed in
DIIID reverse shear operations (Fig 1) [W. W. Heidbrink, Nucl. Fusion, 53, 093006, (2013)] and the TAE destabilized in DIIID pedestal [Huang J. APS Division of Plasma Physics Meeting 2016,
abstract #JP10.108].

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