Publication: Analysis of Alfven eigenmode destabilization by energetic particles in Large Helical Device using a Landau-closure model
dc.affiliation.dpto | UC3M. Departamento de Física | es |
dc.affiliation.grupoinv | UC3M. Grupo de Investigación: Física de Plasmas | es |
dc.contributor.author | Varela, Jacobo | |
dc.contributor.author | Spong, Donald | |
dc.contributor.author | García Gonzalo, Luis | |
dc.contributor.funder | Ministerio de Economía y Competitividad (España) | es |
dc.date.accessioned | 2021-05-07T08:43:36Z | |
dc.date.available | 2021-05-07T08:43:36Z | |
dc.date.issued | 2017-04 | |
dc.description.abstract | Energetic particle populations in nuclear fusion experiments can destabilize the Alfven Eigenmodes through inverse Landau damping and couplings with gap modes in the shear Alfven continua. 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. We add the Landau damping and resonant destabilization effects using a closure relation. We apply the model to study the Alfven mode stability in the inward-shifted configurations of the Large Helical Device (LHD), performing a parametric analysis of the energetic particle beta(beta(f)) in a range of realistic values, the ratios of the energetic particle thermal/Alfven velocities (V-th/V-A0), the magnetic Lundquist numbers (S) and the toroidal modes (n). The n = 1 and n = 2 TAEs are destabilized, although the n = 3 and n = 4 TAEs are weakly perturbed. The most unstable configurations are associated with the density gradients of energetic particles in the plasma core: the TAEs are destabilized, even for small energetic particle populations, if their thermal velocity is lower than 0.4 times the Alfven velocity. The frequency range of MHD bursts measured in the LHD are 50-70 kHz for the n = 1 and 60-80 kHz for the n = 2 TAE, which is consistent with the model predictions. | en |
dc.description.sponsorship | This material is based on work supported both by the U.S. Department of Energy and the Office of Science, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. The research was sponsored in part by the Ministerio de Economia y Competitividad of Spain under project no. ENE2015-68265-P. We also want to acknowledge the LHD group at NIFS for providing us with the VMEC equilibria, and useful interactions with Y. Todo and M. Osakabe. | en |
dc.format.extent | 13 | |
dc.identifier.bibliographicCitation | Varela, J., Spong, D. & Garcia, L. (2017). Analysis of Alfvén eigenmode destabilization by energetic particles in Large Helical Device using a Landau-closure model. Nuclear Fusion, 57(4), 046018. | en |
dc.identifier.doi | https://doi.org/10.1088/1741-4326/aa5d04 | |
dc.identifier.issn | 0029-5515 | |
dc.identifier.publicationfirstpage | 046018 | |
dc.identifier.publicationissue | 4 | |
dc.identifier.publicationtitle | Nuclear Fusion | en |
dc.identifier.publicationvolume | 57 | |
dc.identifier.uri | https://hdl.handle.net/10016/32560 | |
dc.identifier.uxxi | AR/0000020346 | |
dc.language.iso | eng | |
dc.publisher | IOP Publishing | en |
dc.relation.projectID | Gobierno de España. ENE2015-68265-P | es |
dc.rights | © 2017 IAEA, Vienna | en |
dc.rights.accessRights | open access | |
dc.subject.eciencia | Física | es |
dc.subject.other | Stellarator | en |
dc.subject.other | LHD | en |
dc.subject.other | MHD | en |
dc.subject.other | Alfven eigenmodes | en |
dc.subject.other | Energetic particles | en |
dc.title | Analysis of Alfven eigenmode destabilization by energetic particles in Large Helical Device using a Landau-closure model | en |
dc.type | research article | * |
dc.type.hasVersion | AM | * |
dspace.entity.type | Publication |
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