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Energetic Geodesic Acoustic Modes Associated with Two-Stream-like Instabilities in Tokamak Plasmas

Qu, Zhisong; Hole, Matthew; Fitzgerald, Michael

Description

An unstable branch of the energetic geodesic acoustic mode (EGAM) is found using fluid theory with fast ions characterized by their narrow width in energy distribution and collective transit along field lines. This mode, with a frequency much lower than the thermal GAM frequency ωGAM, is now confirmed as a new type of unstable EGAM: a reactive instability similar to the two-stream instability. The mode can have a very small fast ion density threshold when the fast ion transit frequency is...[Show more]

dc.contributor.authorQu, Zhisong
dc.contributor.authorHole, Matthew
dc.contributor.authorFitzgerald, Michael
dc.date.accessioned2018-11-29T22:53:18Z
dc.date.available2018-11-29T22:53:18Z
dc.identifier.issn0031-9007
dc.identifier.urihttp://hdl.handle.net/1885/152430
dc.description.abstractAn unstable branch of the energetic geodesic acoustic mode (EGAM) is found using fluid theory with fast ions characterized by their narrow width in energy distribution and collective transit along field lines. This mode, with a frequency much lower than the thermal GAM frequency ωGAM, is now confirmed as a new type of unstable EGAM: a reactive instability similar to the two-stream instability. The mode can have a very small fast ion density threshold when the fast ion transit frequency is smaller than ωGAM, consistent with the onset of the mode right after the turn-on of the beam in DIII-D experiments. The transition of this reactive EGAM to the velocity gradient driven EGAM is also discussed.
dc.format.mimetypeapplication/pdf
dc.publisherAmerican Physical Society
dc.sourcePhysical Review Letters
dc.titleEnergetic Geodesic Acoustic Modes Associated with Two-Stream-like Instabilities in Tokamak Plasmas
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume116
dc.date.issued2016
local.identifier.absfor020204 - Plasma Physics; Fusion Plasmas; Electrical Discharges
local.identifier.ariespublicationu4105856xPUB42
local.type.statusPublished Version
local.contributor.affiliationQu, Zhisong, College of Science, ANU
local.contributor.affiliationHole, Matthew, College of Science, ANU
local.contributor.affiliationFitzgerald, Michael, College of Science, ANU
dc.relationhttp://purl.org/au-research/grants/arc/DP140100790
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage95004
local.bibliographicCitation.lastpage95004
local.identifier.doi10.1103/PhysRevLett.116.095004
dc.date.updated2018-11-29T07:51:47Z
local.identifier.scopusID2-s2.0-84960930890
local.identifier.thomsonID000371420600008
dcterms.accessRightsOpen Access
dc.provenancehttp://www.sherpa.ac.uk/romeo/issn/0031-9007/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 6/02/19).
CollectionsANU Research Publications

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