Publication:
Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma

Simple item page
dc.affiliation.dptoUC3M. Departamento de Físicaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Física de Plasmases
dc.contributor.authorVarela, J.
dc.contributor.authorCooper, Wa
dc.contributor.authorNagaoka, K.
dc.contributor.authorWatanabe, K.Y.
dc.contributor.authorSpong, D.A.
dc.contributor.authorGarcía Gonzalo, Luis
dc.contributor.authorCappa, A.
dc.contributor.authorAzegami, A.
dc.date.accessioned2021-05-10T10:46:03Z
dc.date.available2021-05-10T10:46:03Z
dc.date.issued2020-02
dc.description.abstractThe aim of the present study is to analyze the stability of the pressure gradient driven modes (PM) and Alfvén eigenmodes (AE) in the large helical device (LHD) plasma if the rotational transform profile is modified by the current drive of the tangential neutral beam injectors (NBI). This study forms a basic search for optimized operation scenarios with reduced mode activity. The analysis is performed using the code FAR3d which solves the reduced MHD equations describing the linear evolution of the poloidal flux and the toroidal component of the vorticity in a full 3D system, coupled with equations for density and parallel velocity moments of the energetic particle (EP) species, including the effect of the acoustic modes. The Landau damping and resonant destabilization effects are added via the closure relation. On-axis and off-axis NBI current drive modifies the rotational transform which becomes strongly distorted as the intensity of the neutral beam current drive (NBCD) increases, leading to wider continuum gaps and modifying the magnetic shear. The simulations with on-axis NBI injection show that a counter (ctr-) NBCD in inward shifted and default configurations leads to a lower growth rate of the PM, although strong n  =  1 and 2 AEs can be destabilized. For the outward shifted configurations, a co-NBCD improves the AEs stability but the PM are further destabilized if the co-NBCD intensity is 30 kA T−1. If the NBI injection is off-axis, the plasma stability is not significantly improved due to the further destabilization of the AE and energetic particle modes (EPM) in the middle and outer plasma region.en
dc.description.sponsorshipThis work is supported in part by NIFS under contract NIFS07KLPH004.en
dc.format.extent17
dc.identifier.bibliographicCitationVarela, J., Cooper, W., Nagaoka, K., Watanabe, K., Spong, D., Garcia, L., Cappa, A. & Azegami, A. (2020). Effect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasma. Nuclear Fusion, 60(2), 026016.es
dc.identifier.doihttps://doi.org/10.1088/1741-4326/ab60cf
dc.identifier.issn0029-5515
dc.identifier.publicationfirstpage1
dc.identifier.publicationissue2
dc.identifier.publicationlastpage17
dc.identifier.publicationtitleNuclear Fusionen
dc.identifier.publicationvolume60
dc.identifier.urihttps://hdl.handle.net/10016/32577
dc.identifier.uxxiAR/0000026684
dc.language.isoeng
dc.publisherIOP Publishingen
dc.rights© 2020 IAEA, Viennaen
dc.rights.accessRightsopen access
dc.subject.ecienciaFísicaes
dc.subject.otherLHDen
dc.subject.otherStabilityen
dc.subject.otherMHDen
dc.subject.otherAlfvén modesen
dc.subject.otherNeutral beam current driveen
dc.titleEffect of the tangential NBI current drive on the stability of pressure and energetic particle driven MHD modes in LHD plasmaen
dc.typeresearch article*
dc.type.hasVersionAM*
dspace.entity.typePublication
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Tangential_NF_2020_ps.pdf
Size:
4.38 MB
Format:
Adobe Portable Document Format
Download
Collections
DF - GFP - Artículos de revistas