MHD stability in X-point geometry: simulation of ELMs

Huysmans, G.; Czarny, Olivier

doi:10.1088/0029-5515/47/7/016

Cited by 245 publications

(298 citation statements)

References 23 publications

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“…256) and in recent nonlinear MHD simulations of ELMs. 90,275,[299][300][301][302][303] Ref. 90 explicitly discusses the observation in the simulations of ELM filaments which carry current.…”

Section: Electromagnetic Effects On Blob-filaments and Elmsmentioning

confidence: 99%

Convective transport by intermittent blob-filaments: Comparison of theory and experiment

2011

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A blob-filament (or simply “blob”) is a magnetic-field-aligned plasma structure which is considerably denser than the surrounding background plasma and highly localized in the directions perpendicular to the equilibrium magnetic field B. In experiments and simulations, these intermittent filaments are often formed near the boundary between open and closed field lines, and seem to arise in theory from the saturation process for the dominant edge instabilities and turbulence. Blobs become charge-polarized under the action of an external force which causes unequal drifts on ions and electrons; the resulting polarization-induced E × B drift moves the blobs radially outwards across the scrape-off-layer (SOL). Since confined plasmas generally are subject to radial or outwards expansion forces (e.g., curvature and ∇B forces in toroidal plasmas), blob transport is a general phenomenon occurring in nearly all plasmas. This paper reviews the relationship between the experimental and theoretical results on blob formation, dynamics and transport and assesses the degree to which blob theory and simulations can be compared and validated against experiments.

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Section: Electromagnetic Effects On Blob-filaments and Elmsmentioning

confidence: 99%

Convective transport by intermittent blob-filaments: Comparison of theory and experiment

2011

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“…Previously, time-evolution codes solving resistive and/or extended MHD have been used to simulate ELMs [18,19,20,21,22,23,26,27]. To our knowledge, these are the first ideal MHD time-dependent simulations of ELMs: no dissipation is intentionally introduced, so the only dissipation present is numerical.…”

Section: Elm Simulationsmentioning

confidence: 99%

BOUT++: A framework for parallel plasma fluid simulations

Dudson

Umansky

et al. 2009

Computer Physics Communications

404

423

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A new modular code called BOUT++ is presented, which simulates 3D fluid equations in curvilinear coordinates. Although aimed at simulating Edge Localised Modes (ELMs) in tokamak x-point geometry, the code is able to simulate a wide range of fluid models (magnetised and unmagnetised) involving an arbitrary number of scalar and vector fields, in a wide range of geometries. Time evolution is fully implicit, and 3 rd -order WENO schemes are implemented. Benchmarks are presented for linear and non-linear problems (the Orszag-Tang vortex) showing good agreement. Performance of the code is tested by scaling with problem size and processor number, showing efficient scaling to thousands of processors.Linear initial-value simulations of ELMs using reduced ideal MHD are presented, and the results compared to the ELITE linear MHD eigenvalue code. The resulting mode-structures and growth-rate are found to be in good agreement (γBOUT ++ = 0.245ωA, γELIT E = 0.239ωA, with Alfvénic timescale 1/ωA = R/VA). To our knowledge, this is the first time dissipationless, initial-value simulations of ELMs have been successfully demonstrated.

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“…An increase of the averaged stabilizing effect was shown for τ rot ~ 0.1 τ NTM and larger. J. Pratt and E. Westerhof reported plans to use the nonlinear reduced-MHD simulation code, JOREK [4] to study NTM dynamics more quantitatively in the future.…”

Section: Eccd For Ntm Stabilizationmentioning

confidence: 99%

Summary of papers presented in the Theory and Modelling session

Lin‐Liu

Westerhof

2012

EPJ Web of Conferences

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Abstract.A total of 14 contributions were presented in the Theory and Modelling sessions at EC-17. One Theory and Modelling paper was included in the ITER ECRH and ECE sessions each. Three papers were in the area of nonlinear physics discussing parametric processes accompanying ECRH. Eight papers were based on the quasi-linear theory of wave heating and current drive. Three of these addressed the application of ECCD for NTM stabilization. Two papers considered scattering of EC waves by edge density fluctuations and related phenomena. In this summary, we briefly describe the highlights of these contributions. Finally, the three papers concerning modelling of various aspects of ECE are reported in the ECE session.

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MHD stability in X-point geometry: simulation of ELMs

Cited by 245 publications

References 23 publications

Convective transport by intermittent blob-filaments: Comparison of theory and experiment

Convective transport by intermittent blob-filaments: Comparison of theory and experiment

BOUT++: A framework for parallel plasma fluid simulations

Summary of papers presented in the Theory and Modelling session

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