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Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model

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dc.affiliation.dptoUC3M. Departamento de Físicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Física de Plasmases
dc.contributor.authorVarela, Jacobo
dc.contributor.authorSpong, Donald
dc.contributor.authorGarcía Gonzalo, Luis
dc.contributor.funderMinisterio de Economía y Competitividad (España)es
dc.date.accessioned2021-05-07T10:46:39Z
dc.date.available2021-05-07T10:46:39Z
dc.date.issued2019-07
dc.description.abstractAlfvén eigenmodes (AE) can be destabilized during ITER discharges driven by neutral beam injection (NBI) energetic particles (EP) and alpha particles. The aim of the present study is to analyze the AE stability of different ITER operation scenarios considering multiple energetic particle species. We use the reduced magneto-hydrodynamic (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 EP species including the effect of the acoustic modes. The AEs driven by the NBI EP and alpha particles are stable in the configurations analyzed, only MHD-like modes with large toroidal couplings are unstable, although both can be destabilized if the EP increases above a threshold. The threshold is two times the model value for the NBI EP and alpha particles in the reverse shear (RS) case, leading to the destabilization of Beta induced AE (BAE) near the magnetic axis with a frequency of kHz and toroidal or elliptical AE (TAE/EAE) in the RS region with a frequency of kHz, respectively. On the other hand, the hybrid and steady state configurations show a threshold 3 times larger with respect to the model for the alpha particle and 40 times for the NBI EP, also destabilizing BAE and TAE between the inner and middle plasma region. In addition, a extended analysis of the RS scenario where the of both alpha particles and NBI EP are above the AE threshold, multiple EP damping effects are also identified as well as optimization trends regarding the resonance properties of the alpha particle and NBI EP with the bulk plasma.es
dc.description.sponsorshipThis material based on work is partially supported both by the U.S. Department of Energy, Office of Science, under Contract DE-AC05-00OR22725 with UT-Battelle, LLC and U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, using the DIII-D National Fusion Facility, a DOE Office of Science user facility, under Award No. DE-FC02-04ER54698. DIII-D data shown in this paper can be obtained in digital format by following the links at https://fusion.gat.com/global/D3D_DMP. This research was sponsored in part by the Ministerio of Economia y Competitividad of Spain under project no. ENE2015-68265-P. The authors would like to thanks Y. Todo for fruitful discussions.en
dc.format.extent13
dc.identifier.bibliographicCitationVarela, J., Spong, D. & Garcia, L. (2019). Analysis of Alfven eigenmode destabilization in ITER using a Landau closure model. Nuclear Fusion, 59(7), 076036.en
dc.identifier.doihttps://doi.org/10.1088/1741-4326/ab1ebe
dc.identifier.issn0029-5515
dc.identifier.publicationfirstpage076036
dc.identifier.publicationissue7
dc.identifier.publicationtitleNuclear Fusionen
dc.identifier.publicationvolume59
dc.identifier.urihttps://hdl.handle.net/10016/32567
dc.identifier.uxxiAR/0000025094
dc.language.isoeng
dc.publisherIOP Publishingen
dc.relation.projectIDGobierno de España. ENE2015-68265-Pes
dc.rights© 2019 IAEA, Viennaen
dc.rights.accessRightsopen access
dc.subject.ecienciaFísicaes
dc.subject.otherAEen
dc.subject.otherAlpha particlesen
dc.subject.otherEPen
dc.subject.otherITERen
dc.subject.otherMHDen
dc.titleAnalysis of Alfven eigenmode destabilization in ITER using a Landau closure modelen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
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