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Reduced particle and heat transport with quasisymmetry in the Helically Symmetric Experimenta)
a)Paper ZI1 4, Bull. Am. Phys. Soc. 51, 336 (2006).
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10.1063/1.2709862
/content/aip/journal/pop/14/5/10.1063/1.2709862
http://aip.metastore.ingenta.com/content/aip/journal/pop/14/5/10.1063/1.2709862

Figures

Image of FIG. 1.
FIG. 1.

Magnetic spectrum for the (a) QHS and (b) Mirror configurations.

Image of FIG. 2.
FIG. 2.

Profiles of the effective ripple in the QHS (solid line) and Mirror (dashed line) configurations.

Image of FIG. 3.
FIG. 3.

Profiles of (a) rotational transform and (b) magnetic well depth for the QHS (solid line) and Mirror (dashed lines) configurations.

Image of FIG. 4.
FIG. 4.

Contours of the fraction of the electron current collected on the back of the head of the axis-finding probe for the (a) QHS and (b) Mirror configurations.

Image of FIG. 5.
FIG. 5.

The normalized monoenergetic diffusion coefficients , where is the particle energy) for (a) Mirror and (b) QHS, shown as a function of collision frequency normalized to the particle speed . DKES calculations are shown as points, and fits based on Eq. (2) in the text are shown as lines. The different lines for each configuration represent calculations for different values for the radial electric field. The normalized electric fields for the Mirror calculations are labeled; the QHS calculations use the same values.

Image of FIG. 6.
FIG. 6.

brightness across the plasma cross section from measurement (solid lines) and from calibrated DEGAS calculations (dashed). Chord number 5 is used to scale the DEGAS results to experiment.

Image of FIG. 7.
FIG. 7.

Profiles of (a) particle source rate density and (b) radial particle flux for a QHS plasma, from DEGAS calculations and measurements.

Image of FIG. 8.
FIG. 8.

Profiles of (a) electron temperature and (b) density in QHS and Mirror plasmas with ECRH.

Image of FIG. 9.
FIG. 9.

Profiles of experimental (solid line) and neoclassical (dashed line) particle fluxes for the (a) Mirror and (b) QHS discharges of Fig. 8. The dotted lines represent the range of uncertainty in the experimental particle flux.

Image of FIG. 10.
FIG. 10.

Profiles of (a) electron temperature and (b) density for a QHS (solid line) plasma with of injected power and a Mirror (dashed line) plasma with of power.

Image of FIG. 11.
FIG. 11.

Measured kinetic stored energy vs time for a QHS plasma with of heating ( is ECH switch-off). Line is fit to data that give absorbed power of .

Image of FIG. 12.
FIG. 12.

Power deposition profiles from ray-tracing calculations for QHS and Mirror.

Image of FIG. 13.
FIG. 13.

Experimental and neoclassical thermal diffusivities for the discharges shown in Fig. 10.

Tables

Generic image for table
Table I.

Distribution of auxiliary coil currents for one field period in the nonsymmetric configurations. Plus signs indicate that the current in the auxiliary coil is in the same direction as the main coils, minus signs indicate that it is in the opposite direction.

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2007-04-13
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Reduced particle and heat transport with quasisymmetry in the Helically Symmetric Experimenta)
http://aip.metastore.ingenta.com/content/aip/journal/pop/14/5/10.1063/1.2709862
10.1063/1.2709862
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