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Edge transport and turbulence reduction with lithium coated plasma facing components in the National Spherical Torus Experiment a)
a)Paper JI2 1, Bull. Am. Phys. Soc. 55, 148 (2010).
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10.1063/1.3592519
/content/aip/journal/pop/18/5/10.1063/1.3592519
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/5/10.1063/1.3592519
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Time traces of a) plasma current, b) neutral beam input power, c) plasma stored energy, d) line-averaged electron density, and e) divertor D emission for pre- (black) and with-lithium (red/gray) discharges.

Image of FIG. 2.
FIG. 2.

(Color online) Edge profiles without (black) and with (red) lithium of a) electron density, b) electron temperature, c) ion temperature, and d) total pressure.

Image of FIG. 3.
FIG. 3.

(Color online) Effective diffusivities a) D eff and (b) χ eff, and c) total radial particle flux from pure dueterium modeling for pre- (black) and with-lithium (red/gray) discharges.

Image of FIG. 4.
FIG. 4.

(Color online) a) Measured contribution of carbon 6+ to electron density (circles), n 6+ from SOLPS modeling (dashed lines), and deuterium density (solid lines) from SOLPS; b) deuterium diffusivity D eff, and c) electron thermal diffusivity χ eff from modeling including carbon of the pre- (black) and with-lithium ((red/gray)) discharges.

Image of FIG. 5.
FIG. 5.

(Color online) Profiles from scan of lithium thickness of a) electron density, b) electron temperature, c) D eff and d) χ eff.

Image of FIG. 6.
FIG. 6.

(Color online) Reflectometer in-phase and quadrature signals for a) pre-lithium discharge (between ELMs) and c) with-lithium; measured amplitude PDF and fit to Rice distribution for b) pre- and d) with-lithium discharges.

Image of FIG. 7.
FIG. 7.

(Color online) Simulated ν/σ ratios for a) pre-lithium and b) with-lithium discharges. Solid black curves are experimental values.

Image of FIG. 8.
FIG. 8.

(Color online) Profiles of a) n b) T and c) dn/n from relectometer measurements in pre- (black) and with-lithium (red/gray) discharges.

Image of FIG. 9.
FIG. 9.

(Color online) Time traces of a) plasma current, b) neutral beam input power, c) plasma stored energy, d) line-averaged electron density, and e) divertor D emission for a discharges with thin (black) and thick (red/light gray, blue/dark gray) lithium coatings.

Image of FIG. 10.
FIG. 10.

(Color online) Pedestal a) density and b) temperature profiles from repeated experiment with little lithium at 5 MW (black), 3 MW thick lithium coatings (red/light gray) and 2 MW thick lithium coatings (blue/dark gray). Horizontal bars near shot labels indicate approximate scattering locations for each discharge.

Image of FIG. 11.
FIG. 11.

(Color online) Density fluctuation spectra from high-k scattering diagnostic, comparing 5 MW ELMing discharges (black) with a) 3 MW (red/gray) and b) 2 MW (blue/gray) thick lithium coated ELM-free discharges.

Image of FIG. 12.
FIG. 12.

(Color online) Profiles of normalized electron temperature (solid curves) and density (dashed) gradients, and ETG temperature ratio and shear factors (dotted) for a) pre-lithium and b) with-lithium cases.

Image of FIG. 13.
FIG. 13.

(Color online) Experimental and paleoclassical values of a) χ eff and (b) density profile for pre- (black) and with-lithium (red/gray) discharges.

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2011-05-26
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Edge transport and turbulence reduction with lithium coated plasma facing components in the National Spherical Torus Experiment a)
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/5/10.1063/1.3592519
10.1063/1.3592519
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