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First attempt to quantify W7-X island divertor plasma by local experiment-model comparison

Y. Feng, Y. Gao, T. Kremeyer, D. Gradic, L. Rudischhauser, G. Fuchert, S. Bozhenkov, M. Endler, M. Jakubowski, R. Koenig2021年被引用 4Nuclear FusionIF 3出版社

As a complement to our recent work [1], which focused on understanding the basic detachment physics and general experimental and numerical trends observed in the W7-X island divertor, this paper compares EMC3-Eirene simulation results with different local diagnostics, including IR cameras, Langmuir probes, Hα-cameras, and Thomson scattering. The main purposes are to (1) justify the simulation setup in the previous work, (2) identify the application limitations of the current EMC3-Eirene model, (3) verify the consistency of different diagnostics, and (4) isolate the main geometric and physical effects that need to be prioritized in further developing the EMC3-Eirene code and improving diagnostic capabilities. It turns out that the current version of the EMC3-Eirene code (without drifts) is not yet able to quantitatively reproduce all selected local measurements simultaneously under the current experimental conditions (in particular, the existence of error fields). Nevertheless, it can be shown that within a reasonable range of variation in magnetic configuration, cross-field transport, and SOL plasma state in the modeling, a region of overlap between the numerical results and the local measurements can be established. More accurate model-experiment comparisons will require clarification of error fields, implementation of drifts in EMC3, and improvement of diagnostic capabilities.

日本語訳

我々の最近の研究[1]の補完として、W7-X島状ダイバータにおける基本的分離物理と、実験的・数値的に観測された一般的な傾向の理解に焦点を当てたが、本論文ではEMC3-EIRENEシミュレーション結果と、IRカメラ、ラングミュアプローブ、Hαカメラ、トムソン散乱を含む様々な局所診断との比較を行う。主な目的は、(1)前研究におけるシミュレーション設定の妥当性を検証すること、(2)現在のEMC3-EIRENEモデルの適用限界を特定すること、(3)異なる診断間の整合性を確認すること、(4)EMC3-EIRENEコードのさらなる発展と診断能力の向上において優先すべき主要な幾何学的・物理的効果を抽出することである。現在の実験条件(特に誤差磁場の存在)の下では、現在のEMC3-EIRENEコード(ドリフトなし)は、選択した全ての局所測定を定量的に同時再現することはまだできないことが判明した。それにもかかわらず、磁気配位、クロスフィールド輸送、およびモデリングにおけるSOLプラズマ状態の合理的な範囲内で、数値結果と局所測定の間に重複領域を確立できることが示された。より正確なモデルと実験の比較には、誤差磁場の解明、EMC3-EIRENEへのドリフトの実装、および診断能力の向上が必要となる。

装置

wendelstein-7x高精度(タイトル一致)

wiki

DivertorW7-XDivertor plasmaIsland divertor
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