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Modeling the effect of anisotropic pressure on tokamak plasmas normal modes and continuum using fluid approaches

Qu, Zhisong; Hole, Matthew; Fitzgerald, Michael

Description

Extending the ideal MHD stability code MISHKA, a new code, MISHKA-A, is developed to study the impact of pressure anisotropy on plasma stability. Based on full anisotropic equilibrium and geometry, the code can provide normal mode analysis with three fluid closure models: the single adiabatic model (SA), the double adiabatic model (CGL) and the incompressible model. A study on the plasma continuous spectrum shows that in low beta, large aspect ratio plasma, the main impact of anisotropy lies in...[Show more]

dc.contributor.authorQu, Zhisong
dc.contributor.authorHole, Matthew
dc.contributor.authorFitzgerald, Michael
dc.date.accessioned2016-06-13T23:26:17Z
dc.identifier.issn0741-3335
dc.identifier.urihttp://hdl.handle.net/1885/102541
dc.description.abstractExtending the ideal MHD stability code MISHKA, a new code, MISHKA-A, is developed to study the impact of pressure anisotropy on plasma stability. Based on full anisotropic equilibrium and geometry, the code can provide normal mode analysis with three fluid closure models: the single adiabatic model (SA), the double adiabatic model (CGL) and the incompressible model. A study on the plasma continuous spectrum shows that in low beta, large aspect ratio plasma, the main impact of anisotropy lies in the modification of the BAE gap and the sound frequency, if the q profile is conserved. The SA model preserves the BAE gap structure as ideal MHD, while in CGL the lowest frequency branch does not touch zero frequency at the resonant flux surface where m + nq = 0, inducing a gap at very low frequency. Also, the BAE gap frequency with bi-Maxwellian distribution in both model becomes higher if p<inf>τ</inf> > p<inf>∥</inf> with a q profile dependency. As a benchmark of the code, we study the m/n = 1/1 internal kink mode. Numerical calculation of the marginal stability boundary with bi-Maxwellian distribution shows a good agreement with the generalized incompressible Bussac criterion (Mikhailovskii 1983 Sov. J. Plasma Phys. 9 190): the mode is stabilized(destabilized) if p<inf>∥</inf> < p<inf>τ</inf>( p<inf>∥</inf> > p<inf>τ</inf>).
dc.publisherInstitute of Physics Publishing
dc.sourcePlasma Physics and Controlled Fusion
dc.titleModeling the effect of anisotropic pressure on tokamak plasmas normal modes and continuum using fluid approaches
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume57
dc.date.issued2015
local.identifier.absfor020200 - ATOMIC, MOLECULAR, NUCLEAR, PARTICLE AND PLASMA PHYSICS
local.identifier.ariespublicationU3488905xPUB6153
local.type.statusPublished Version
local.contributor.affiliationQu, Zhisong, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationHole, Matthew, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFitzgerald, Michael, CCFE Culham Science Centre
local.description.embargo2037-12-31
local.bibliographicCitation.issue9
local.bibliographicCitation.startpage13
local.identifier.doi10.1088/0741-3335/57/9/095005
dc.date.updated2016-06-10T08:16:24Z
local.identifier.scopusID2-s2.0-84942928764
CollectionsANU Research Publications

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