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Nonlocal neoclassical transport in tokamak and spherical torus experiments
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10.1063/1.2244532
/content/aip/journal/pop/13/8/10.1063/1.2244532
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/8/10.1063/1.2244532
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Benchmark results of global GTC-Neo simulation against standard neoclassical (local) theory in a large aspect ratio circular concentric geometry limit (aspect ratio ): (a) radial electric field with uniform ion temperature compared with Eq. (12); (b) with nonuniform temperature compared with neoclassical theory of ion parallel flow; (c) ion heat flux compared with the Chang-Hinton formula; (d) total (electron+ion) bootstrap current; (e) electron heat flux; and (f) electron particle flux.

Image of FIG. 2.
FIG. 2.

(Color online) Simulated ion heat fluxes versus (the near magnetic axis) compared with local transport theory prediction (dotted lines from the Chang-Hinton formula). Simulations use a numerical MHD equilibrium of circular cross section with , and two specified pressure profiles.

Image of FIG. 3.
FIG. 3.

(Color online) Ion heat flux (at ) normalized by the local neoclassical theory prediction (using the Chang-Hinton formula) scales with orbit size represented by the parameter .

Image of FIG. 4.
FIG. 4.

(Color online) Ion heat flux distribution function: Contributions to the heat flux from ions with different energies.

Image of FIG. 5.
FIG. 5.

(Color online) The distribution of heat flux as a function of the pitch angle variable of particle velocity.

Image of FIG. 6.
FIG. 6.

(Color online) Neoclassical equilibrium distribution function with reduced dimension .

Image of FIG. 7.
FIG. 7.

(Color online) Simulated neoclassical ion heat fluxes versus of an NSTX plasma, compared with the experimental measurement (from TRANSP modeling) and the prediction of standard neoclassical theory (from NCLASS; Ref. 29). Also plotted is the measured ion temperature profile.

Image of FIG. 8.
FIG. 8.

(Color online) Simulated neoclassical ion heat fluxes versus for an NSTX shot, compared with the experimental measurement and the prediction of standard neoclassical theory.

Image of FIG. 9.
FIG. 9.

(Color online) Bootstrap current in toroidally rotating plasma. Simulations use three different rotation profiles .

Image of FIG. 10.
FIG. 10.

(Color online) Bootstrap current with large ion temperature gradient.

Image of FIG. 11.
FIG. 11.

(Color online) Bootstrap current versus , and bootstrap current distribution as a function of the pitch angle variable and as a function of parallel velocity. Simulation uses an NSTX-like magnetic geometry.

Image of FIG. 12.
FIG. 12.

(Color online) Simulated neoclassical radial electric field, compared with calculated from the radial force balance relation with experimental pressure and toroidal flow velocity and standard neoclassical poloidal flow velocity.

Image of FIG. 13.
FIG. 13.

(Color online) Simulated neoclassical radial electric field for NSTX discharge of Fig. 8, compared with calculated from the radial force balance relation with experimental pressure and toroidal flow velocity and standard neoclassical poloidal flow velocity.

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/content/aip/journal/pop/13/8/10.1063/1.2244532
2006-08-04
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nonlocal neoclassical transport in tokamak and spherical torus experiments
http://aip.metastore.ingenta.com/content/aip/journal/pop/13/8/10.1063/1.2244532
10.1063/1.2244532
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