High- n ideal and resistive shear Alfvén waves in tokamaks
TLDR
In this paper, the ideal and resistive MHD equations for the shear Alfven waves are studied in a low-β toroidal model by employing the high-n ballooning formalism.About:
This article is published in Annals of Physics.The article was published on 1985-04-15 and is currently open access. It has received 450 citations till now. The article focuses on the topics: Resistive touchscreen.read more
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Alfvén eigenmodes in reversed shear plasmas in JT-60U negative-ion-based neutral beam injection discharges
Manabu Takechi,Atsushi Fukuyama,M. Ishikawa,Chio-Zong Cheng,Kouji Shinohara,Takahisa Ozeki,Yoshinori Kusama,S. Takeji,Takaaki Fujita,T. Oikawa,Takahiro Suzuki,Naoyuki Oyama,A. Morioka,N. N. Gorelenkov,G. J. Kramer,Raffi Nazikian +15 more
TL;DR: In this article, rapid frequency sweeping modes were observed in reversed magnetic shear (RS) plasmas on the Japan Atomic Energy Research Institute Tokamak 60 Upgrade (JT-60U) and were identified as reversed-shear-induced Alfven eigenmodes (RSAEs) localized to the region of minimum safety factor, qmin.
Journal ArticleDOI
Alfvén waves: a journey between space and fusion plasmas
TL;DR: In this article, the anisotropic nearly incompressible shear wave is particularly interesting since, in realistic non-uniform plasmas, its wave spectra consist of both the regular discrete and the singular continuous components.
Journal ArticleDOI
Gyrokinetic analysis and simulation of pedestals to identify the culprits for energy losses using 'fingerprints'
Mike Kotschenreuther,X. Liu,David Hatch,Swadesh M Mahajan,Linjin Zheng,Ahmed Diallo,R. J. Groebner,J. C. Hillesheim,C. F. Maggi,C. Giroud,F. Koechl,V.V. Parail,S. Saarelma,E. R. Solano,A. V. Chankin,Jet Contributors +15 more
TL;DR: In this article, a new concept of fingerprints is introduced to identify the in-plane fingerprints of the edge transport barrier (ETB) in order to suppress energy losses in tokamaks.
Journal ArticleDOI
Magnetic safety factor profile before and after sawtooth crashes investigated with toroidicity and ellipticity induced Alfvén eigenmodes
TL;DR: In this article, toroidicity and ellipticity induced Alfven eigenmodes (TAEs and EAEs) that are excited before and after sawtooth crashes during ion cyclotron range of frequency (ICRF) heating in JT-60U are presented.
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Systematic study of toroidicity-induced Alfvén eigenmodes at low-q discharges in JT-60U
Mikio Saigusa,Haruyuki Kimura,Y. Kusama,G. J. Kramer,T. Ozeki,S. Moriyama,T. Oikawa,Yuzuru Neyatani,Takashi Kondoh +8 more
TL;DR: In this article, Toroidicity-induced Alfv?n eigenmodes (TAE) were studied systematically in low-q discharges in JT-60U.
References
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Journal ArticleDOI
Finite‐Resistivity Instabilities of a Sheet Pinch
TL;DR: In this paper, the stability of a plane current layer is analyzed in the hydromagnetic approximation, allowing for finite isotropic resistivity, and the effect of a small layer curvature is simulated by a gravitational field.
Journal ArticleDOI
Resistive instabilities in general toroidal plasma configurations
TL;DR: In this article, the Mercier criterion for the stability of the ideal magnetohydrodynamic interchange mode is derived, the generalization of the earlier stability criterion for resistive interchange mode was obtained, and a relation between the two was noted.
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A theory of long‐period magnetic pulsations: 2. Impulse excitation of surface eigenmode
Liu Chen,Akira Hasegawa +1 more
TL;DR: In this paper, a wave equation that shows a coupling between a surface wave and a shear Alfven wave is derived, and a theory of long-period magnetic pulsations (Pc 3 to Pc 5) is presented as an initial value problem to explain impulse-excited pulsations.
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Decay of MHD waves by phase mixing
J. Tataronis,W. Grossmann +1 more
TL;DR: In this article, the authors examined the dispersion relation for plasmas with non-uniform profiles and compared the results with those of a sharp boundary model, showing that the frequency of the waves is a complex quantity having a real and imaginary part.
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Kinetic-ballooning-mode theory in general geometry
TL;DR: In this article, a systematic procedure for studying the influence of kinetic effects on the stability of MHD ballooning modes is presented, which includes effects due to finite gyroradius, trapped particles, and wave-particle resonances.
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