Modelling of the boundary plasma of large tokamaks

Braams, Bastiaan J.; Harbour, P.J.; Harrison, Mark; Hotston, E.S.; Morgan, J.G.

doi:10.1016/0022-3115(84)90106-5

Cited by 39 publications

(29 citation statements)

References 3 publications

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“…The code has been used to model the TEXTOR tokamak's ergodic divertor [6] and to make predictions for the W7-X stellarator [7]. Aside from the specialized (MonteCarlo) numerical techniques required for accurate 3D computation, E3D works like a threedimensional version of the axisymmetric UEDGE [9] and B2 [10] edge-modeling codes.…”

Section: Introductionmentioning

confidence: 99%

Stochastic transport modeling of resonant magnetic perturbations in DIII-D

Joseph

Moyer

Evans

et al. 2007

Journal of Nuclear Materials

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Three-dimensional two-fluid simulations of heat transport due to resonant magnetic perturbations of tokamaks have been computed by coupling the TRIP3D field line tracing code to the E3D edge transport code. The predicted electron temperature contours follow the new separatrix represented by the perturbed invariant manifold structure of the X-point in qualitative agreement with X-point TV observations. However, preliminary modeling predicts that the resulting stochastic heat transport is greater than that measured in low-collisionality ELM suppression experiments in DIII-D H-mode plasmas. While improved determination of transport coefficients is definitely required, possible explanations include plasma screening of resonant perturbations, invalid treatment of the edge as a fluid, or insufficient understanding of stochastic heat transport.

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Section: Introductionmentioning

confidence: 99%

Stochastic transport modeling of resonant magnetic perturbations in DIII-D

Joseph

Moyer

Evans

et al. 2007

Journal of Nuclear Materials

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“…Although both the constant tempera- The approach taken in this study illustrates the qualitative features of edge/scrape-off layer phenomena. More detailed calculations can be obtained from two dimensional codes [22][23][24]. We observe that because multiple solutions exist simulation codes can miss the correct solution.…”

Section: Discussionmentioning

confidence: 99%

MARFE formation in diverted tokamaks

Kesner¹,

Freidberg²

1995

Nucl. Fusion

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We consider the equilibrium and stability of Marfes. We demonstrate that important aspects of the 2-dimensional problem can be illustrated by a 1-dimensional treatment. A stability analysis indicates that Marfe formation requires low temperature, high impurity content and low cross field transport. Additionally, Marfes tend to form on flux surfaces that contain an x-point. We observe that the transition to a Marfe-like solution can result from a fluctuation-induced jump from a neighboring constant temperature solution.1

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“…These codes have helped clarifying our understanding of basic phenomena involved in edge physics. However, important questions remain little explored due to limitations in the field of application of most of these tools: transport models [10][11][12][13] require ad-hoc transport coefficients as an input although this approach is not necessarily valid [14,15]; 2D turbulence models [16][17][18] cannot give an insight on the parallel dynamics of turbulence since they rely on the flute hypothesis on which recent results shed doubt [19]; gradient-driven models [20] require hypotheses on plasma equilibrium profiles or coupling with transport codes and do not reproduce the whole richness of multiscale dynamics [19]; exclusive closed field lines [21] or SOL [16] codes are not able to take coherently into account the physics linked to the open-closed field lines transition across the LCFS. .…”

Section: Introductionmentioning

confidence: 99%