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Internal electron transport barrier due to neoclassical ambipolarity in the Helically Symmetric Experimenta)
a)Paper NI3 6, Bull. Am. Phys. Soc. 54, 182 (2009).
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View: Figures


Image of FIG. 1.
FIG. 1.

Neoclassical particle fluxes vs for . The three ambipolar roots are labeled, with the middle root unstable to perturbations in .

Image of FIG. 2.
FIG. 2.

(a) Measured electron temperature and (b) density profiles from Thomson scattering for a 100 kW QHS plasma. (c) Ion temperature profile measured by ChERS.

Image of FIG. 3.
FIG. 3.

Normalized monoenergetic transport coefficient vs from DKES showing the peaking and reduction in transport due to the poloidal resonance.

Image of FIG. 4.
FIG. 4.

Neoclassical particle fluxes vs for three different radii. (a) , , ; (b) , , ; (c) , , . Ion particle flux ignoring the effect of the resonance is shown for reference (dashed line).

Image of FIG. 5.
FIG. 5.

Neoclassically predicted radial electric field profile for the profiles shown in Fig. 2.

Image of FIG. 6.
FIG. 6.

(a) Ambipolar radial electric field profile and solutions to Eq. (6) for several values of . (b) Growth rates calculated from experimental profiles and shearing rates corresponding to two extreme values of .

Image of FIG. 7.
FIG. 7.

Simulated and measured electron temperature profiles. Simulated profiles are shown with and without effect of shear suppression, for a range of and .

Image of FIG. 8.
FIG. 8.

Neoclassically predicted ion parallel flow profile. Upper curve corresponds to ion root solutions and lower curve to electron root (see Fig. 5).

Image of FIG. 9.
FIG. 9.

Neoclassical particle fluxes vs with and without the effect of momentum conservation (MC). (a) In the QHS configuration and (b) in the spoiled symmetry configuration for the same input profiles. The effect of MC on the electron flux is minimal.

Image of FIG. 10.
FIG. 10.

Predicted radial electric field profiles with and without momentum conservation (MC).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Internal electron transport barrier due to neoclassical ambipolarity in the Helically Symmetric Experimenta)