Results 261 to 270 of about 1,047,530 (303)
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Tearing modes at the magnetopause
Journal of Geophysical Research: Space Physics, 1996It is shown that the shear flow present in the magnetopause current layer can destabilize the tearing modes depending upon the Mach number profiles. Using a variational principle, an heuristic stability criterion based on the form of the Mach number profile is obtained. This criterion could be used as a handy tool to search for tearing mode instability
G. S. Lakhina, K. Schindler
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Journal of the Physical Society of Japan, 1985
The magnetohydrodynamic stability of streaming tearing mode is investigated numerically. A bulk plasma flow parallel to the antiparallel magnetic field lines and localized in the neutral sheet excites a streaming tearing mode more strongly than the usual tearing mode, particularly for the wavelength of the order of the neutral sheet width (or smaller),
Mitsuhiro Shigeta +2 more
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The magnetohydrodynamic stability of streaming tearing mode is investigated numerically. A bulk plasma flow parallel to the antiparallel magnetic field lines and localized in the neutral sheet excites a streaming tearing mode more strongly than the usual tearing mode, particularly for the wavelength of the order of the neutral sheet width (or smaller),
Mitsuhiro Shigeta +2 more
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AIP Conference Proceedings, 2008
This lecture gives a basic introduction to magnetic £elds, magnetic surface destruction, toroidal equilibrium and tearing modes in a tokamak, including the linear and nonlinear development of these modes and their modi£cation by current drive and bootstrap current, and sawtooth oscillations and disruptions.
R. B. White, Sadruddin Benkadda
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This lecture gives a basic introduction to magnetic £elds, magnetic surface destruction, toroidal equilibrium and tearing modes in a tokamak, including the linear and nonlinear development of these modes and their modi£cation by current drive and bootstrap current, and sawtooth oscillations and disruptions.
R. B. White, Sadruddin Benkadda
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Linear stability and mode structure of drift tearing modes
Physics of Plasmas, 2001Ion viscosity and particle diffusivity effects on the linear stability and mode structure of drift-tearing modes are investigated. If only resistivity and diamagnetic effects are taken into account, the drift-tearing mode can exist only as a propagating wave packet, which is resolved numerically as an initial value problem.
D. GRASSO +2 more
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Nonlinear Stability of Drift-Tearing Modes
Physical Review Letters, 1985The nonlinear stability of drift-tearing modes in the presence of an electron temperature inhomogeneity is investigated. It is shown that linearly growing drift-tearing modes are rendered stable at a very small island width by quasilinear thermal effects.
, Scott, , Drake, , Hassam
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Radial identification of tearing modes in a Tokamak
Proceedings of the 21st IEEE Instrumentation and Measurement Technology Conference (IEEE Cat. No.04CH37510), 2004Abstract - The focus of the present research is the control of rotating magnetic islands of low helical mode numbers (m.n) in thermonuclear plasmas. These perturbations are associated with local distorsions of the current profile that can be a serious cause of degradation of the plasma confinement .
Berrino J +3 more
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Physica Scripta, 1990
Vortex solutions for tearing modes have ben constructed in the slab model by solving MHD equations for a plasma bounded by vacuum. The vortices are nondipolar, nonlocalised and exist only for a specific type of behaviour of the shear given in the text. An approximate estimate has been made of the diffusion coefficient pertaining to such a mode.
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Vortex solutions for tearing modes have ben constructed in the slab model by solving MHD equations for a plasma bounded by vacuum. The vortices are nondipolar, nonlocalised and exist only for a specific type of behaviour of the shear given in the text. An approximate estimate has been made of the diffusion coefficient pertaining to such a mode.
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Influence of Energetic Ions on Tearing Modes
Physical Review Letters, 2011In contrast with the stability effects of trapped energetic ions on tearing modes, the effects of circulating energetic ions (CEI) on tearing modes depend on the toroidal circulating direction, and are closely related to the momentum of energetic ions. CEI provide an additional source or sink of momentum to affect tearing modes.
Huishan, Cai +4 more
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Suppression of the tearing mode by energetic ions
Physical Review Letters, 1989The effect of an energetic ion population on the nonlinear stability of a tearing mode of single helicity is determined using kinetic theory. A dynamical equation is derived for the magnetic-island width. It is shown that the island growth can be suppressed in a tokamak when the energetic ion-density profile peaks just outside the rational surface ...
, Hegna, , Bhattacharjee
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Interactions between neoclassical tearing modes
Nuclear Fusion, 2000Neoclassical tearing modes (NTMs) with different mode numbers have been observed in tokamak plasmas. These NTMs, however, never occur simultaneously in ASDEX Upgrade. As a mode with a different helicity starts to grow, this usually leads to suppression of the first NTM.
Yu, Q. +4 more
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