Journal ArticleDOI
More on core‐localized toroidal Alfvén eigenmodes
TLDR
In this article, a novel ideal toroidal Alfven eigenmode, localized in the low-shear core region of a tokamak plasma, is shown to exist, whose frequency is near the upper continuum of the toroidal gap.Abstract:
A novel type of ideal toroidal Alfven eigenmode, localized in the low‐shear core region of a tokamak plasma, is shown to exist, whose frequency is near the upper continuum of the toroidal Alfven gap. This mode converts to a kinetic‐type toroidal Alfven eigenmode above a critical threshold that depends on aspect ratio, pressure gradient, and shear. Opposite to the usual ideal toroidal Alfven eigenmode, this new mode is peaked in amplitude on the small‐major‐radius side of the plasma.read more
Citations
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Journal ArticleDOI
Beta-dependence of energetic particle-driven instabilities in spherical tokamaks
TL;DR: In this article, the dependence of toroidal Alfven eigenmodes (TAEs) and frequency-sweeping 'chirping' modes on the thermal plasma β-value is investigated experimentally, and a decrease both in the mode amplitudes and in the number of unstable modes with increasing β is found, in line with theoretical expectations.
Journal ArticleDOI
Particle simulation of bursting Alfvén modes in JT-60Ua)
Sergio Briguglio,G. Fogaccia,Gregorio Vlad,Fulvio Zonca,Kouji Shinohara,M. Ishikawa,M. Takechi +6 more
TL;DR: In this paper, the results of particle-in-cell simulations of a negative neutral beam heated Alfven-mode experiment in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) are presented.
Journal Article
Particle simulation of bursting Alfv\'{e}n modes in JT-60U
TL;DR: In this paper, the results of particle-in-cell simulations of a negative neutral beam heated Alfven-mode experiment in the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) are presented.
Journal ArticleDOI
1.5D quasilinear model and its application on beams interacting with Alfvén eigenmodes in DIII-D
TL;DR: In this paper, Van Zeeland et al. proposed a model based on quasilinear theory to study energetic particle (EP) interaction with toroidal Alfvenic eigenmodes (TAE) in the case where the local EP drive for TAE exceeds the stability limit.
Journal ArticleDOI
Alfvén frequency modes at the edge of TFTR plasmas
Z. Chang,E.D. Fredrickson,Stewart Zweben,H.K. Park,Raffi Nazikian,E. Mazzucato,S. H. Batha,M. G. Bell,R.V. Budny,C.E. Bush,D. S. Darrow,D.R. Ernst,Guoyong Fu,R.J. Hawryluk,K. W. Hill,J. C. Hosea,A.C. Janos,D. L. Jassby,David W. Johnson,L. C. Johnson,Fred Levinton,D.K. Mansfield,K. M. McGuire,D. R. Mikkelsen,D. Mueller,D. K. Owens,A. T. Ramsey,S.A. Sabbagh,E. J. Synakowski,H. Takahashi,G. Taylor,M. E. Thompson,R. M. Wieland,K. L. Wong,M. C. Zarnstorff +34 more
TL;DR: In this article, a quasi-coherent Alfven frequency mode (AFM) was observed in TFTR neutral beam heated plasmas as well as in ohmic Plasmas.
References
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Journal ArticleDOI
Kinetic theory of toroidicity-induced alfvén eigenmodes
TL;DR: In this article, an analytic kinetic description of the toroidicity-induced Alfven eigenmode (TAE) is presented, which includes electron parallel dynamics nonperturbatively, an effect that is found to strongly influence the character and damping of the TAE−contrary to previous theoretical predictions.
Journal ArticleDOI
Continuum damping of low‐n toroidicity‐induced shear Alfvén eigenmodes
TL;DR: In this paper, the effect of resonant continuum damping is investigated for the lowmode-number, toroidicity-induced, global shear Alfven eigenmodes, which can be self-excited by energetic circulating alpha particles in an ignited tokamak plasma.
Journal ArticleDOI
Theory of continuum damping of toroidal Alfvén eigenmodes in finite‐β tokamaks
Fulvio Zonca,Liu Chen +1 more
TL;DR: In this paper, a general theoretical approach has been formulated for analyzing two-dimensional structures of high-n toroidal Alfven eigenmodes (TAE) in large aspect-ratio, finite-β tokamaks.
Journal ArticleDOI
Energetic particle drive for toroidicity-induced Alfven eigenmodes and kinetic toroidicity-induced Alfven eigenmodes in a low-shear tokamak
Boris Breizman,S. E. Sharapov +1 more
TL;DR: In this article, the structure of toroidicity-induced Alfven eigenmodes and kinetic TAE (KTAE) with large mode numbers is analyzed and the linear power transfer from energetic particles to these modes is calculated in the low-shear limit when each mode is localized near a single gap within an interval whose total width Delta out is much smaller than the radius of the mode location.
Journal ArticleDOI
Existence of core localized toroidicity‐induced Alfvén eigenmode
TL;DR: In this article, the core-localized toroidicity-induced Alfven eigenmode (TAE) was shown to exist at finite plasma pressure due to finite aspect ratio effects in tokamak plasma.
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Excitation of the toroidicity-induced shear Alfvén eigenmode by fusion alpha particles in an ignited tokamak
Guoyong Fu,J. W. Van Dam +1 more