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Large-mode-number magnetohydrodynamic instability driven by sheared flows in a tokamak plasma with reversed central shear
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10.1063/1.2435319
/content/aip/journal/pop/14/1/10.1063/1.2435319
http://aip.metastore.ingenta.com/content/aip/journal/pop/14/1/10.1063/1.2435319
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Equilibrium profiles of (a) the safety factor and current density , and (b) the angular frequency and vorticity . resonances are indicated by dotted lines.

Image of FIG. 2.
FIG. 2.

(a) Linear growth rate and (b) rotation frequency for the modes , (6, 3), and (12, 6), in dependence of the core rotation parameter . The effective and specific shearing rates, and , are plotted as dash-dotted lines. In (c), spectra of linear growth rates are shown for three cases with : stationary, stabilized, destabilized. A spectrum obtained with a narrower shear layer is also shown (, ).

Image of FIG. 3.
FIG. 3.

Linear eigenmode structures for [(a) and (b)] and (20, 10) [(c) and (d)]. The flow parameters are , , and . Flux and potential are decomposed into magnitude and complex phases as . Vertical dotted lines indicate resonant surfaces.

Image of FIG. 4.
FIG. 4.

Snapshots of nonlinear dynamics at (a) and (b) . Top: profiles. Dotted lines indicate the original resonant radii. Middle: profiles. Bottom: helical magnetic flux contours in the plane.

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/content/aip/journal/pop/14/1/10.1063/1.2435319
2007-01-31
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Large-mode-number magnetohydrodynamic instability driven by sheared flows in a tokamak plasma with reversed central shear
http://aip.metastore.ingenta.com/content/aip/journal/pop/14/1/10.1063/1.2435319
10.1063/1.2435319
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