Interaction of bootstrap‐current‐driven magnetic islands
نویسندگان
چکیده
منابع مشابه
Interaction of turbulence and magnetic islands
We have investigated the role of turbulence for two problems, the effect of the polarization current on the NTM and the effect of diamagnetic drifts on mode penetration. For the NTM problem, we find that the fluctuations exert a drag force on the island that results in a stabilizing slowdown in the propagation velocity. For the mode penetration problem, we have investigated the influence of pol...
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The phase velocity of magnetic islands is calculated in the semicollisional regime with cold ions. Two solution branches arise, corresponding to islands propagating with the ions and with the electrons. For the ion branch the phase velocity and the polarization current are small. For the electron branch, the phase velocity depends on the ratio of W, the half-width of the island, and rho(s), the...
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The effect of sheared flow on a magnetic island is examined. In contrast to the density and temperature gradients which are flattened for sufficiently wide islands, it is found that the velocity gradient persists inside the separatrix whenever the constant-! approximation is satisfied. It follows that velocity shear has a negligible effect on island amplitude in that approximation. The effect o...
متن کاملRotation and Locking of Magnetic Islands
Stationary magnetic perturbations are frequently observed to be followed by major disruptions [1–3]. They occur as a result of the locking of the plasma rotation, either by a resonant error field or through the interaction between a magnetic island and the resistive vessel wall [4,5]. This Letter examines the possibility of unlocking islands by injection of momentum. We find that inertial force...
متن کاملTheory and Observations of magnetic islands
Islands are a ubiquitous feature of magnetically confined plasmas. They arise as the result of plasma instabilities as well as imperfections in the coils. Effective techniques have been developed for keeping their width small. Even thin islands, however, are observed to have nonlocal effects on the profiles of rotation and current. This has stimulated interest in using magnetic islands to contr...
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ژورنال
عنوان ژورنال: Physics of Fluids B: Plasma Physics
سال: 1992
ISSN: 0899-8221
DOI: 10.1063/1.860039