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
Fast particle modifications to equilibria and resulting changes to Alfvén wave modes in tokamaks
TL;DR: In this paper, the impact of rotation and anisotropy on magnetohydrodynamic (MHD) waves of the plasma was quantified and the effect of neutral beam heating on the magnetic configuration and wave modes in tokamaks was investigated.
Journal ArticleDOI
Comprehensive evaluation of the linear stability of Alfv\'en eigenmodes driven by alpha particles in an ITER baseline scenario
A.C.A. Figueiredo,Paulo Rodrigues,D. N. Borba,R. Coelho,L. Fazendeiro,Jorge Ferreira,Nuno Loureiro,F. Nabais,S. D. Pinches,A. R. Polevoi,S. E. Sharapov +10 more
TL;DR: In this article, the linear stability of the Alfv\'en eigenmodes in the presence of fusion-born alpha particles is thoroughly assessed for two variants of an ITER baseline scenario, which differ significantly in their core and pedestal temperatures.
Journal ArticleDOI
TAE stability calculations compared to TAE antenna results in JET
F. Nabais,V. Aslanyan,D. N. Borba,R. Coelho,R. J. Dumont,Jorge Ferreira,A.C.A. Figueiredo,Michael Fitzgerald,E. Lerche,J. Mailloux,Mervi Mantsinen,Paulo Rodrigues,Miklos Porkolab,P. Puglia,S. E. Sharapov,Jet Contributors +15 more
TL;DR: In this article, the excitation of modes in the toroidal Alfven eigenmodes (TAE) gap by an external antenna can be modelled by a driven damped harmonic oscillator.
Journal ArticleDOI
Plasma compressibility induced toroidal Alfvén eigenmode
Linjin Zheng,Liu Chen +1 more
TL;DR: In this paper, it was shown that there exists a new frequency gap within the shear Alfven continuous spectrum around the Alfven frequency, ωA=vA/qR, due to the ion compressibility effect.
Journal ArticleDOI
Destabilization of TAE modes using ICRH in ASDEX Upgrade
D. N. Borba,Garrard Conway,Sibylle Günter,G. T. A. Huysmans,S. Klose,M. Maraschek,A. Mück,I. Nunes,S. D. Pinches,F. Serra +9 more
TL;DR: In this paper, the toroidicity-induced Alfv?n eigenmodes (TAEs) are destabilized in ASDEX upgrade using ion cyclotron resonant heating (ICRH).
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