3D Edge Modeling and Island Divertor Physics

Feng, Y.; Sardei, F.; Kißlinger, J.; Grigull, P.; McCormick, K.; Reiter, D.

doi:10.1002/ctpp.200410009

Cited by 205 publications

(225 citation statements)

References 21 publications

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“…The EMC3 code solves the Braginskii fluid equations for plasma transport and is self-consistently coupled with the EIRENE code [22,23]. The EIRENE code is applied for treating the kinetic neutral transport.…”

Section: The Description Of the Emc3-eirene Codementioning

confidence: 99%

EMC3-EIRENE modelling of edge plasma and impurity emissions compared with the liquid lithium limiter experiment on EAST

et al. 2018

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Studies of edge plasma and impurity transport with the toroidally and poloidally localized liquid lithium limiter (LLL) on EAST have been performed by the three-dimensional (3D) edge transport code EMC3-EIRENE. The transport behavior of the Li1+ and Li2+ ions shows a non-axisymmetric distribution in the toroidal direction while an axisymmetric distribution is obtained for the Li3+ ions. The spatial structure of the charge state and excitation radiation patterns of lithium impurity can be understood by using field line tracing, which shows that the Li ions with different charge states exhibit different parallel transport behaviors. The 3D line-integrated LiII emission pattern simulated by EMC3-EIRENE shows a reasonable qualitative agreement with the experiment results measured by the CCD camera system on EAST. An unresolved issue in the LLL experiment is that the species emitting the strong visible spectrum observed around the edge plasma region cannot be distinguished by the current experimental diagnostics on EAST. The detailed numerical analysis of the carbon and deuterium emissions has been carried out to resolve this issue. The simulated deuterium emission pattern shows the same qualitative behavior as the experimental observation at the lower divertor region. The strong radiation experimentally observed at the upper divertor region is perhaps due to the mixing of the lithium and deuterium emissions.

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Section: The Description Of the Emc3-eirene Codementioning

confidence: 99%

EMC3-EIRENE modelling of edge plasma and impurity emissions compared with the liquid lithium limiter experiment on EAST

et al. 2018

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“…A more realistic simulation must include 3D effects and this has started for AUG [49] using the EMC3-Eirene code package, where EMC3 is an edge 3D Monte Carlo plasma fluid code [50]. A comprehensive description of these EMC3 simulations for the AUG experiment is reported in a separate paper [51].…”

Section: Sol Modellingmentioning

confidence: 99%

Maximization of ICRF power by SOL density tailoring with local gas injection

et al. 2016

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Experiments have been performed under the coordination of the International Tokamak Physics Activity (ITPA) on several tokamaks, including ASDEX Upgrade (AUG), JET and DIII-D, to characterize the increased Ion cyclotron range of frequency (ICRF) antenna loading achieved by optimizing the position of gas injection relative to the RF antennas. On DIII-D, AUG and JET (with the ITER-Like Wall) a 50% increase in the antenna loading was observed when injecting deuterium in ELMy H-mode plasmas using mid-plane inlets close to the powered antennas instead of divertor injection and, with smaller improvement when using gas inlets located at the top of the machine. The gas injection rate required for such improvements (~0.7 × 10 22 el s −1 in AUG, ~1.0 × 10 22 el s −1 in JET) is compatible with the use of this technique to optimize ICRF heating during the development of plasma scenarios and no degradation of confinement was observed when using the mid-plane or top inlets compared with divertor valves. An increase in the scrape-off layer (SOL) density was measured when switching gas injection from divertor to outer mid-plane or top. On JET and DIII-D, the measured SOL density increase when using main chamber puffing is consistent with the antenna coupling resistance increase provided that the distance between the measurement lines of sight and the injection location is taken into account. Optimized gas injection was also (2016) 046001 (14pp) P. Jacquet et al 2 found to be beneficial for reducing tungsten (W) sputtering at the AUG antenna limiters, and also to reduce slightly the W and nickel (Ni) content in JET plasmas. Modeling the specific effects of divertor/top/mid-plane injection on the outer mid-plane density was carried out using both the EDGE2D-EIRENE and EMC3-EIRENE plasma boundary code packages; simulations indeed indicate that outer mid-plane gas injection maximizes the density in the mid-plane close to the injection point with qualitative agreement with the AUG SOL density measurements for EMC3-EIRENE. Field line tracing for ITER in the 15 MA Q DT = 10 reference scenario indicates that the planned gas injection system could be used to tailor the density in front the antennas. Benchmarking of EMC3-EIRENE against AUG and JET data is planned as a first step towards the ITER SOL modelling required to quantify the effect of gas injection on the SOL density in front of the antennas.

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“…The working principle as well as the full set of equations solved by EMC3-Eirene are described in detail in Ref. [16]. Here, we only want to summarize that EMC3 solves Braginskii's equations and is self-consistently coupled to Eirene, which solves the kinetic equation for the neutrals.…”

Section: Code and Computational Gridmentioning

confidence: 99%

First EMC3-Eirene simulations of the impact of the edge magnetic perturbations at ASDEX Upgrade compared with the experiment

et al. 2012

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Abstract. The EMC3-Eirene code package was applied for the first time to simulate the edge plasma in an ASDEX Upgrade discharge, in which the newly installed magnetic perturbation coils were used to mitigate Edge Localized Modes (ELMs). Two different points in time during this discharge were simulated, the ELM mitigated phase after turning-on of the magnetic perturbation coils and, as a reference, the ELMy H-mode phase before. The results were compared to the measurements of various edge and divertor diagnostics. Assuming the main chamber profiles to be shifted by 15mm with respect to their calibrated positions, an agreement within a factor of 2 was found between the main chamber profiles outside the separatrix and those at the outer divertor target. The most important result is the observation of several maxima and minima in the particle flux and in particular in the power deposition pattern of both the simulation and the experiment for the case with magnetic perturbations, an effect also known as strike-point splitting.

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3D Edge Modeling and Island Divertor Physics

Cited by 205 publications

References 21 publications

EMC3-EIRENE modelling of edge plasma and impurity emissions compared with the liquid lithium limiter experiment on EAST

EMC3-EIRENE modelling of edge plasma and impurity emissions compared with the liquid lithium limiter experiment on EAST

Maximization of ICRF power by SOL density tailoring with local gas injection

First EMC3-Eirene simulations of the impact of the edge magnetic perturbations at ASDEX Upgrade compared with the experiment

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