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Divertor characterization and access to dissipative divertor conditions in negative triangularity discharges in DIII-D

F Scotti, A Marinoni, A G McLean, A O Nelson, C Paz-Soldan, K E Thome, M Zhao, S Allen, M Austin, M G Burke2025年9月Plasma Physics and Controlled FusionIF 2.2出版社

Reduced radial transport, short midplane-to-target parallel connection lengths, and a strong effect of cross-field drifts were responsible for the high densities required for detachment in strong negative triangularity (NT) configurations in DIII-D. Dissipative divertor conditions were achieved in NT discharges at different triangularity, injected power, plasma current, and toroidal field direction. Differences between negative and positive triangularity (PT) discharges are analyzed in this paper to understand the requirements for access to detached divertor conditions: power balance, geometry, radial transport and effect of cross-field particle drifts. Parametric dependencies of access to detachment on plasma current and power flowing into the scrape-off layer remained similar in negative and PT and impurity seeding was observed to reduce the density needed to detach by up to 30% at the expense of core impurity dilution. The impact of triangularity on core-edge integration was tested varying bottom triangularity at fixed top triangularity. The high density needed to detach was not intrinsic to the NT edge as shapes with positive lower triangularity and negative upper triangularity were able to detach at lower upstream densities while maintaining an ELM-free NT edge. Confinement degradation at deeper detachment levels was however observed in all NT shapes, often associated with radiation instabilities.

日本語訳

低減された径方向輸送、短い中平面からターゲットへの平行接続長、および磁場横断ドリフトの強い効果は、DIII-Dにおける強い負の三角形度(NT)配位でディタッチメントに必要な高密度の原因であった。散逸ダイバータ条件は、異なる三角形度、入射パワー、プラズマ電流、およびトロイダル磁場方向のNT放電において達成された。本論文では、負の三角形度(NT)と正の三角形度(PT)の放電間の差異を分析し、ディタッチドダイバータ条件へのアクセス要件(パワーバランス、形状、径方向輸送、および磁場横断粒子ドリフトの効果)を理解する。ディタッチメントへのアクセスのプラズマ電流およびスクレイプオフ層へ流入するパワーに対するパラメトリック依存性は、負の三角形度と正の三角形度で類似したままであり、不純物シーディングは、コア不純物希釈を犠牲にして、ディタッチに必要な密度を最大30%減少させることが観察された。三角形度がコア・エッジ統合に与える影響は、上部三角形度を固定して下部三角形度を変化させることで試験された。ディタッチに必要な高密度はNTエッジに固有のものではなく、下部が正の三角形度で上部が負の三角形度を持つ形状は、ELMフリーのNTエッジを維持しながら、より低い上流密度でディタッチすることができた。しかしながら、より深いディタッチメントレベルでの閉じ込め劣化は、すべてのNT形状で観察され、しばしば放射不安定性と関連していた。

装置

diii-d高精度(タイトル一致)

wiki

DivertorDIII-DTriangularityNegative triangularity

AIによる論文要約

DIII-Dにおける負の三角形配位の解離性ダイバータ条件への到達
JAこの論文は、核融合プラズマの閉じ込めと解離性ダイバータの特性に興味のある研究者や学生に有益です。特に、プラズマ形状が解離性ダイバータ条件に及ぼす影響について理解を深めることができます。#核融合プラズマ #ダイバータ #三角形配位 #DIII-D
LLM向け: {'Title': '到達高密度解離性ダイバータ条件における負三角形配位の特性', 'Author(s)': 'DIII-D研究チーム', 'Research …

この論文は、DIII-Dにおける強い負の三角形配位のプラズマにおける高密度の解離性ダイバータ条件の実現について報告しています。プラズマ電流、入力パワー、トロイダル磁場の方向を変えても、同様の高密度条件が必要であることを示しています。また、正の三角形配位との違いも分析しており、三角形配位が解離性ダイバータ条件の実現に大きな影響を与えることを明らかにしています。

Characterization of the divertor and access to dissipative divertor conditions in negative triangularity discharges in DIII-D
ENThis paper would be of interest to fusion researchers and engineers working on divertor optimization and plasma shaping, as it provides insights into the unique challenges and requirements for achieving dissipative divertor conditions in negative triangularity configurations, which could be useful for future fusion reactor designs.#FusionDivertorOptimization #NegativeTriangularity #DissipativeDetachment #DIII-D
LLM向け: {'Title': 'Characterization of the divertor and access to dissipative divertor c…

This paper investigates the requirements for achieving detached divertor conditions in negative triangularity (NT) configurations on the DIII-D tokamak. The authors found that reduced radial transport, short parallel connection lengths, and cross-field drifts led to the high densities needed for detachment in NT shapes. Parametric dependencies on plasma current and power were similar in NT and positive triangularity discharges, and impurity seeding helped reduce the detachment density. The impact of triangularity on core-edge integration was also tested, showing that shapes with positive lower triangularity and negative upper triangularity could detach at lower densities while maintaining an ELM-free NT edge.

Characterization of the divertor and access to dissipative divertor conditions in negative triangularity discharges in DIII-D
ENThis paper should be read by fusion researchers, particularly those interested in divertor physics, plasma shaping, and the integration of core and edge plasma performance. It provides insights into the requirements for achieving detached divertor conditions in advanced tokamak configurations, which is crucial for the development of future fusion reactors.#DivertorPhysics #PlasmaShaping #CoreEdgeIntegration #FusionResearch
LLM向け: {'Title': 'Characterization of the divertor and access to dissipative divertor c…

This paper investigates the requirements for achieving detached divertor conditions in negative triangularity (NT) configurations in the DIII-D tokamak. The authors analyze the differences between NT and positive triangularity (PT) discharges, focusing on power balance, geometry, radial transport, and the effect of cross-field particle drifts. They found that high densities were required for detachment in NT configurations due to reduced radial transport and short parallel connection lengths, but impurity seeding could reduce the density needed. The impact of triangularity on core-edge integration was also tested, and shapes with positive lower triangularity and negative upper triangularity were able to detach at lower upstream densities while maintaining an ELM-free NT edge.

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