Kinetic Theories of Geodesic Acoustic Modes:Radial Structure,Linear Excitation by Energetic Particles and Nonlinear Saturation'.pdfVIP
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Kinetic Theories of Geodesic Acoustic Modes:Radial Structure,Linear Excitation by Energetic Particles and Nonlinear Saturation'.pdf
PlasmaScienceandTechnology,Vo1.13,No.3,Jun2011
K ineticTheoriesofGeodesicAcousticM odes:RadialStructure,
LinearExcitation by EnergeticParticlesand
NonlinearSaturation
QIUZhiyong(仇志勇),FulvioZONCA,一,CHENLiu(陈骝),。
InstituteforYhsionTheoryandSimulation,ZhejiangUniversity,Hangzhou310027,China
。AssociazioneEuratom-ENEA sullaFusione,C.P.65一I-00044一Frascati,Italy
。Dept
. ofPhysicsna dAstronomy,Univ.ofCalifornia,IrvineCA 92697-4575,USA
AbstractGeodesicacousticmodes(GAMs)areoscillatingzonalmodestructuresuniqueto
toroidalplasmasandarecapableofregulatingmicroscopicturbulenceandassociatedtransports.
Inthispaper,threeimportantaspectsofGAM dynamicsareinvestigated,namely (1)GAM
continuousspectrum anditsmodeconversiontokineticGAM (KGAM);(2)linearexcitation
ofenergeticparticleinducedGAM (EGAM)anditscouplingtotheGAM continuum,and(3)
nonlinearsaturationofEGAM viawaveparticletrapping.TheanalogybetweentheGAM.EGAM
dynamicsandthewellknownbeam.plasmainstabilityarealsodiscussed.
Keywords:geodesicacousticmode,continuum,energeticparticles,waveparticletrapping
PACS:52.35.Fp,52.35.Qz,52.55.Tn
1 Introduction theGAM modeequation via fluid theory isderived,
theexistenceoftheGAM continuousspectrum isde—
GeodesicacousticmodesfGAMs1t1]aretoroidally mostrated and thephysicsassociatedwith it such as
symmetric normalmodesunique totoroidalplasmas phase mixing and mode conversion to kinetic GAM
with a modestructurethatisnearly poloidally sym— fKGAM1arestudied indetail. Insection3thedis—
metric.GAMsarepredominantlyelectrostaticmodes,
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