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Modeling of combined effects of divertor closure and advanced magnetic configuration on detachment in DIII-D by SOLPS

H. Si, H.Y. Guo, B. Covele, A.W. Leonard, J.G. Watkins, D. Thomas, R. Ding2018年被引用 3Nuclear FusionIF 3出版社

One of the major challenges facing the design and operation of next-step high-power steady-state fusion devices is to develop a divertor solution for handling power exhaust, while ensuring acceptable divertor target plate erosion, which necessitates access to divertor detachment at relative low main plasma densities compatible with current drive and high plasma confinement. Detailed modeling with SOLPS is carried out to examine the effect of divertor closure on detachment with the normal single null divertor (SD) configuration, as well as one of the advanced divertor configurations, such as x-divertor (XD) respectively. The SOLPS modeling for a high confinement plasma in DIII-D finds that increasing divertor closure with SD reduces the upstream separatrix density at the onset of detachment from to . Moreover, coupling the divertor closure with XD further promotes the onset of divertor detachment at a still lower upstream separatrix density, down to the value of , thus, showing that divertor closure and advanced magnetic configuration can work synergistically to facilitate divertor detachment.

日本語訳

次世代の高出力定常核融合装置の設計と運転における主要な課題の一つは、電力排熱を処理するためのダイバータ解決策を開発することであり、同時に許容可能なダイバータ標的板の侵食を確保する必要があり、これは電流駆動と高いプラズマ閉じ込めと両立する比較的低い主プラズマ密度でのダイバータ・デタッチメントへのアクセスを必要とする。SOLPSを用いた詳細なモデリングを実施し、通常のシングルヌル・ダイバータ(SD)構成、および先進ダイバータ構成の一つであるXダイバータ(XD)それぞれについて、ダイバータ閉鎖度がデタッチメントに及ぼす影響を調べた。DIII-Dにおける高閉じ込めプラズマに対するSOLPSモデリングは、SDによるダイバータ閉鎖度の増加が、デタッチメント開始時の上流セパラトリックス密度を から に低減することを見出した。さらに、ダイバータ閉鎖度をXDと組み合わせることで、ダイバータ・デタッチメントの開始がさらに低い上流セパラトリックス密度、すなわち の値まで促進され、これによりダイバータ閉鎖度と先進磁場構成が相乗的に作用してダイバータ・デタッチメントを促進できることが示された。

装置

diii-d高精度(タイトル一致)

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DivertorDIII-DDivertor detachmentScrape-Off Layer Plasma Simulation
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