Simulation of Edge Plasmas in DIII-D Double-Null Configurations

Rensink, M.E.; Lasnier, C.J.; Pétrie, T.W.; Porter, G. D.; Rognlien, T. D.

doi:10.1002/1521-3986(200204)42:2/4<181::aid-ctpp181>3.0.co;2-0

Cited by 5 publications

(4 citation statements)

References 6 publications

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“…However, it has been found experimentally that the up/down asymmetry of the power and particle exhaust is very sensitive to the up/down magnetic balance. UEDGE modeling, which is consistent with the experimental results, indicate 13 that the in/out and up/down particle and power asymmetries are determined entirely by the effects of classical plasma drifts [57].…”

Section: D Model (Uedge)supporting

confidence: 79%

“…Implementation of these drift effects for all operating modes of DIII-D is ongoing. Inclusion of the drift effects is crucial when modeling double null configurations [56,57]. The use of the double null configuration has been proposed as a means of increasing the wetted surface area over which power is exhausted in advanced tokamak modes [58].…”

Section: D Model (Uedge)mentioning

confidence: 99%

“…Recent simulations indicate the drifts have a strong effect on the divertor plasma, particularly on the high field side which is in general more poorly diagnosed [57].…”

Section: Code Validation Against Diii-d Experimentsmentioning

confidence: 99%

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Developing Models for the DIII-D Boundary Plasma

Porter

Rognlien

Rensink

et al. 2005

Fusion Science and Technology

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Abstract. Development of the comprehensive codes used to study the boundary region of the DIII-D tokamak has been done in parallel with improvement of the diagnostics of this important region of the plasma. These codes have been used to interpret the diagnostic data and assist in design of improved divertor configurations. The development of codes used for analysis on DIII-D is described briefly. Model validation by comparing with the extensive DIII-D boundary region diagnostic data is also discussed.

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Section: D Model (Uedge)supporting

confidence: 79%

Section: D Model (Uedge)mentioning

confidence: 99%

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Developing Models for the DIII-D Boundary Plasma

Porter

Rognlien

Rensink

et al. 2005

Fusion Science and Technology

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“…First, small variations in the magnetic balance near the DN shape have sizable effects on the poloidal distributions of heat and particle fluxes at the divertor targets [2,3], the edge localized mode (ELM)-driven particle pulses at the divertor targets [4] and the poloidal distribution of plasma recycling [5]. Second, ion particle drifts in the scrape-off layer (SOL) and divertor(s), such as B × ∇B and E × B drifts [6][7][8], also contribute to the formation of these poloidal 'asymmetries' [9,10]. The particle flows that result from these drifts have long been suspected of playing important roles in edge-and divertor plasma behaviour and are being actively investigated, e.g.…”

Section: Introductionmentioning

confidence: 99%

Variation of particle exhaust with changes in divertor magnetic balance

Pétrie¹,

Allen

Brooks³

et al. 2005

Nucl. Fusion

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Recent experiments on DIII-D point to the importance of two factors in determining how effectively the deuterium particle inventory in a tokamak plasma can be controlled through pumping at the divertor target(s): (1) the divertor magnetic balance, i.e. the degree to which the divertor topology is single-null or double-null (DN) and ( 2) the direction of the of B × ∇B ion drift with respect to the X-point(s). Changes in divertor magnetic balance near the DN shape have a much stronger effect on the particle exhaust rate at the inner divertor target(s) than on the particle exhaust rate at the outer divertor target(s). The particle exhaust rate for the DN shape is strongest at the outer strike point opposite the B × ∇B ion particle drift direction. Our data suggests that the presence of B × ∇B and E × B ion particle drifts in the scrape-off layer and divertor(s) play an important role in the particle exhaust rates of DN and near-DN plasmas. Particle exhaust rates are shown to depend strongly on the edge (pedestal) density. These results have implications for particle control in ITER and other future tokamaks.

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Variation in particle pumping due to changes in topology in high performance DIII-D plasmas

Pétrie

Brooks

Fenstermacher

et al. 2005

Journal of Nuclear Materials

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Recent experiments on DIII-D point to the importance of two factors in determining the rate at which deuterium particles can be pumped at the divertor target(s): (1) the divertor magnetic balance, i.e., the degree to which the divertor topology is single-null (SN) or double-null (DN), and (2) the direction of the of B · $B ion drift with respect to the Xpoint(s). Changes in divertor magnetic balance near the DN shape have a much stronger effect on the pumping rate at the inner divertor target(s) than on the pumping rate at the outer divertor target(s). The behavior in the particle pumping observed at the inner and outer divertor target(s) in the DN and near-DN shapes suggests a redistribution of particles that would be expected in the presence of B · $B and E · B ion particle drifts in the scrapeoff layer (SOL) and divertor(s).

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Simulation of Edge Plasmas in DIII-D Double-Null Configurations

Cited by 5 publications

References 6 publications

Developing Models for the DIII-D Boundary Plasma

Developing Models for the DIII-D Boundary Plasma

Variation of particle exhaust with changes in divertor magnetic balance

Variation in particle pumping due to changes in topology in high performance DIII-D plasmas

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