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Divertor heat flux mitigation in the National Spherical Torus Experimenta)
a)Paper BI1.00005, Bull. Am. Phys. Soc. , 21 (2007).
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10.1063/1.3068170
/content/aip/journal/pop/16/2/10.1063/1.3068170
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/2/10.1063/1.3068170

Figures

Image of FIG. 1.
FIG. 1.

A lower part of the NSTX poloidal cross section showing the layout of divertor diagnostics, magnetic coils, and gas injectors.

Image of FIG. 2.
FIG. 2.

Divertor peak heat flux as a function of power flowing into the SOL for lower-end discharges. For comparison, also shown are the peak heat fluxes measured in discharges with a partially detached OSP.

Image of FIG. 3.
FIG. 3.

Divertor heat flux profiles in highly shaped (higher-end ) H-mode discharges at three input power values .

Image of FIG. 4.
FIG. 4.

Time traces of (a) plasma current , plasma density , (b) plasma stored energy , divertor gas injection, (c) NBI power and core radiated power , (d) central carbon density , (e) edge C III density, (f) edge He II density, in a reference , NBI discharge and the discharge with a partially detached OSP.

Image of FIG. 5.
FIG. 5.

Time traces of (a) spatially integrated lower divertor brightness, (b) divertor plasma brightness measured by a bolometer chord viewing the outer divertor leg, (c) midplane and divertor pressure, in a reference , NBI discharge (black traces) and the discharge with a partially detached OSP.

Image of FIG. 6.
FIG. 6.

Divertor heat flux profiles in the reference , NBI discharge and the discharge with a partially detached OSP.

Image of FIG. 7.
FIG. 7.

(a) Outer divertor plasma brightness (proportional to radiated power) and (b) outer divertor power fraction as a function of SOL power per particle in reference and PDD discharges.

Image of FIG. 8.
FIG. 8.

(a) Divertor and (b) He II brightness profiles in the reference , NBI discharge and the discharge with a partially detached OSP.

Image of FIG. 9.
FIG. 9.

Divertor deuterium Balmer spectra recorded at three lines of sight shown in Fig. 1 in the reference , NBI discharge and the discharge with a partially detached OSP.

Image of FIG. 10.
FIG. 10.

Neutral compression metric as a function of plasma density in reference and PDD discharges.

Image of FIG. 11.
FIG. 11.

Time traces of (a) OSP major radius, (b) OSP flux expansion and divertor gas injection rate, (c) parallel ion flux measured by inner divertor Langmuir probe 2711, (d) measured by outer divertor Langmuir probe 2913, (e) measured by outer divertor Langmuir probe 1307 in the reference , NBI discharge and the discharge with a partially detached OSP.

Image of FIG. 12.
FIG. 12.

Divertor outer strike point (OSP) heat flux as a function of SOL power for higher-end discharges. For comparison, also shown are the peak heat fluxes measured in discharges with a partially detached OSP.

Image of FIG. 13.
FIG. 13.

Examples of modeled and as functions of parallel connection length for the attached and detached conditions. In this case, , , (attached), (detached).

Image of FIG. 14.
FIG. 14.

Modeled divertor as a function of divertor for several SOL power density values . For these calculations, was used.

Image of FIG. 15.
FIG. 15.

Modeled divertor as a function of divertor for several SOL power density values , and .

Image of FIG. 16.
FIG. 16.

Modeled power radiated by carbon as a function of connection length for various intrinsic carbon concentrations at , according to the post 1D conduction model.

Image of FIG. 17.
FIG. 17.

Structure of NSTX SOL flux tubes: (a) Separatrix contours of the lower-end and higher-end configurations. (b) A visualization of the magnetic field line in the highly shaped configuration. (c) Connection lengths between midplane and target , and X-point and target , as functions of divertor major radius for the highly shaped configuration.

Tables

Generic image for table
Table I.

Comparison between geometrical factors of two NSTX divertor configurations and typical large aspect ratio tokamak parameters.

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2009-02-05
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Divertor heat flux mitigation in the National Spherical Torus Experimenta)
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/2/10.1063/1.3068170
10.1063/1.3068170
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