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Gyrokinetic turbulence under near-separatrix or nonaxisymmetric conditionsa)
a)Paper NI1 6, Bull. Am. Phys. Soc. 53, 160 (2008).
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10.1063/1.3089603
/content/aip/journal/pop/16/5/10.1063/1.3089603
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/5/10.1063/1.3089603

Figures

Image of FIG. 1.
FIG. 1.

Metric coefficients for the flux surface of ASDEX upgrade shot 20431 during its low power phase.

Image of FIG. 2.
FIG. 2.

Two-dimensional growth rate spectrum (in units of ) in the ASDEX upgrade -mode edge for shot 20431. The largest growth rates are obtained for finite radial wavenumbers.

Image of FIG. 3.
FIG. 3.

Absolute value of local shear . Changes in sign are visible as dark lines.

Image of FIG. 4.
FIG. 4.

Tilting of radial structures due to negative magnetic shear.

Image of FIG. 5.
FIG. 5.

Parallel profile of the ETG-induced (electrostatic) electron heat flux .

Image of FIG. 6.
FIG. 6.

Two-dimensional wavenumber spectrum of the ETG-induced (electrostatic) electron heat flux . In contrast to the linear growth rates, the transport peaks around .

Image of FIG. 7.
FIG. 7.

Electron heat diffusivity for different electron temperature gradients. The obtained diffusivities are of the order of the experimentally measured values.

Image of FIG. 8.
FIG. 8.

Numerical determination of the bad curvature component via field-line tracing (solid line) and an MHD approach (dashed line), validating the GIST code.

Image of FIG. 9.
FIG. 9.

(Top) Ion heat diffusivity (in units of ) as a function of the ion temperature gradient . (Bottom) Linear growth rate of the most dominant mode (in units of ) vs .

Image of FIG. 10.
FIG. 10.

Time traces of the ion heat flux for the W7-X (hm) configuration. The lower curve depicts the standard simulation, whereas the upper one the simulation with zeroed out zonal flows.

Image of FIG. 11.
FIG. 11.

Comparison of the ion heat flux for the (lm) configuration (upper line) and for the (hm) configuration (lower line).

Image of FIG. 12.
FIG. 12.

(Top) Time traces of the ion heat flux for the banana tube (lower line) and the bullet tube (upper line). (Bottom) Parallel mode structure of the same quantity for both tubes.

Tables

Generic image for table
Table I.

Plasma parameters for the flux surface of ASDEX upgrade shot 20431 during its low power phase. The values are slightly different from those in Ref. 12 since an updated set of parameters was used.

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2009-03-19
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Gyrokinetic turbulence under near-separatrix or nonaxisymmetric conditionsa)
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/5/10.1063/1.3089603
10.1063/1.3089603
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