Comprehensive suite of codes for plasma-edge modelling

Schneider, R.; Bonnin, X.; McTaggart, N.; Runov, A.; Borchardt, M.; Riemann, J.; Mutzke, A.; Matyash, K.; Leyh, H.; Warrier, M.; Coster, D.; Eckstein, W.; Dohmen, R.

doi:10.1016/j.cpc.2004.06.002

Cited by 4 publications

(2 citation statements)

References 34 publications

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“…Thus, if such an ergodic region exists, for example surrounding the edge island chain, we cover only the plasma domains enclosed within valid flux surfaces that can be established through field line tracing. Building up useful coordinate systems for ergodic regions is a separate problem, beyond the scope of this paper, and is treated elsewhere [12].…”

Section: Initial Quantitiesmentioning

confidence: 99%

Calculation of magnetic coordinates for stellarator fields including islands and the Scrape-Off Layer

Bonnin¹,

Mutzke

Nührenberg

et al. 2004

Nucl. Fusion

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We present an extension of the Nemov algorithm (Nemov V.V. 1988 Nucl. Fusion 28 1727) to compute the magnetic coordinates in stellarators and their associated metric coefficients, requiring only a knowledge of the magnetic field and field line tracing techniques. The method is not limited to the core of the plasma, but also applies to island chains and Scrape-Off Layer regions. The procedure allows the computation of the Clebsch components of the magnetic field by transforming the magnetic differential equations for the radial and angular coordinates into initial-value problems involving field line tracing. Moreover, it has been optimized for numerical accuracy by minimizing recourse to derivatives of derived quantities. Illustrative applications of the algorithm, as applied to W7-X, including a numerical benchmark for the core region, are presented.

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Section: Initial Quantitiesmentioning

confidence: 99%

Calculation of magnetic coordinates for stellarator fields including islands and the Scrape-Off Layer

Bonnin¹,

Mutzke

Nührenberg

et al. 2004

Nucl. Fusion

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“…One of the effective ways to test ideas for physics models is to combine them within an integrative modeling code and compare the simulation results with the experiments. Integrated modeling studies that self-consistently take into account the effects of the plasma edge have been developing during the last decade [1][2][3][4][5]. Some of these simulations are rather comprehensive and take into account MHD equilibrium, turbulent anomalous radial transport, neutral gas transport, atomic and molecular physics, and plasma-wall interactions.…”

Section: Introductionmentioning

confidence: 99%

ELM triggering conditions for the integrated modeling of H-mode plasmas

et al. 2005

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Recent advances in the integrated modeling of ELMy H-mode plasmas are presented. A model for the H-mode pedestal and for the triggering of ELMs predicts the height, width, and shape of the H-mode pedestal and the frequency and width of ELMs. Formation of the pedestal and the L-H transition is the direct result of ExB flow shear suppression of anomalous transport. The periodic ELM crashes are triggered by either the ballooning or peeling MHD instabilities. The BALOO, DCON, and ELITE ideal MHD stability codes are used to derive a new parametric expression for the peeling-ballooning threshold. The new dependence for the peeling-ballooning threshold is implemented in the ASTRA transport code. Results of integrated modeling of DIII-D like discharges are presented and compared with experimental observations. The results from the ideal MHD stability codes are compared with results from the resistive MHD stability code NIMROD.Comment: 12th International Congress on Plasma Physics, 25-29 October 2004, Nice (France

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Theory-based model for the pedestal, edge stability and ELMs in tokamaks

Pankin¹,

Bateman

Brennan

et al. 2006

Nucl. Fusion

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An improved model for triggering edge localized mode (ELM) crashes is developed for use within integrated modelling simulations of the pedestal and ELM cycles at the edge of H-mode tokamak plasmas. The new model is developed by using the BALOO, DCON and ELITE ideal MHD stability codes to derive parametric expressions for the ELM triggering threshold. The whole toroidal mode number spectrum is studied with these codes. The DCON code applies to low mode numbers, while the BALOO code applies to only high mode numbers and the ELITE code applies to intermediate and high mode numbers. The variables used in the parametric stability expressions are the normalized pressure gradient and the parallel current density, which drive ballooning and peeling modes. Two equilibria motivated by DIII-D geometry with different plasma triangularities are studied. It is found that the stable region in the high triangularity discharge covers a much larger region of parameter space than the corresponding stability region in the low triangularity discharge. The new ELM trigger model is used together with a previously developed model for pedestal formation and ELM crashes in the ASTRA integrated modelling code to follow the time evolution of the temperature profiles during ELM cycles. The ELM frequencies obtained in the simulations of low and high triangularity discharges are observed to increase with increasing heating power. There is a transition from second stability to first ballooning mode stability as the heating power is increased in the high triangularity simulations. The results from the ideal MHD stability codes are compared with results from the resistive MHD stability code NIMROD.

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Comprehensive suite of codes for plasma-edge modelling

Cited by 4 publications

References 34 publications

Calculation of magnetic coordinates for stellarator fields including islands and the Scrape-Off Layer

Calculation of magnetic coordinates for stellarator fields including islands and the Scrape-Off Layer

ELM triggering conditions for the integrated modeling of H-mode plasmas

Theory-based model for the pedestal, edge stability and ELMs in tokamaks

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