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Characteristic of the power decay length of small ELMs measured by infrared camera on EAST

G.T. Chen, Q.Q. Yang, J.H. Yang, X. Lin, H. Yang, Z.D. Yang, R.R. Liang, T.H. Wang, B.H. Zhang, L. Wang2025年7月Nuclear FusionIF 3出版社

Small edge-localized-mode (ELM) regimes are being studied as promising solution to reduce the heat flux to the first-wall within tolerable levels in future machines. This study represents the first utilization of a high-resolution infrared camera system on the Experimental Advanced Superconducting Tokamak to investigate the heat flux characteristics of small ELMs. Both typical discharge results and statistical analyses indicate that the power decay length () of small ELMs is broader than that of inter-large ELMs but narrower than that of intra-large ELMs, consistent with previous simulations using the BOUT++ code. Further analysis indicates that low hybrid wave heating has a more significant impact on the of small ELMs compared to other heating schemes. Among all the parameters, the line averaged density () has the most notable effect on the heat flux width of small ELMs, as evidenced by both the correlation analysis and the result from typical shots. Furthermore, the investigation on the heat load deposition in far-scrape-off-layer (SOL) region during small ELMs shows that small ELMs under relatively low collisionality conditions, carrying less than 1% of the plasma stored energy, are found to deposit 0.2–0.45 of the ELM power to the far SOL region.

日本語訳

小さいエッジ局在モード(ELM)領域は、将来の装置において第一壁への熱流束を許容可能なレベルまで低減するための有望な解決策として研究されている。本研究は、Experimental Advanced Superconducting Tokamakにおける高分解能赤外線カメラシステムを、小さいELMの熱流束特性を調査するために初めて利用したものである。典型的な放電結果と統計解析の両方は、小さいELMの電力減衰長()が、inter-large ELMのそれよりも広いが、intra-large ELMのそれよりも狭いことを示しており、これはBOUT++コードを用いた以前のシミュレーションと一致する。さらなる解析は、低ハイブリッド波加熱が、他の加熱方式と比較して、小さいELMの()に対してより顕著な影響を与えることを示している。すべてのパラメータの中で、線平均密度()は、相関解析と典型的なショットの結果の両方によって実証されるように、小さいELMの熱流束幅に最も顕著な効果を持つ。さらに、小さいELM中の遠スクレイプオフ層(SOL)領域における熱負荷堆積の調査は、比較的低い衝突頻度条件下の小さいELMが、プラズマ蓄積エネルギーの1%未満を運び、ELMパワーの0.2–0.45を遠SOL領域に堆積することが見出されることを示している。

装置

east高精度(タイトル一致)

wiki

EASTEdge localized mode

AIによる論文要約

EASTで赤外線カメラで測定したSmall ELMsの電力減衰長の特徴
JAプラズマ物理や核融合炉設計に興味のある研究者や学生が対象です。Small ELMsの熱負荷特性を理解することで、将来の核融合炉設計に役立つ知見が得られます。#SmallELMs #HeatFlux #Tokamak #EASTDevice #FusionReactor
LLM向け: {'Title': '特徴的なSmall ELMsの電力減衰長 - EASTの赤外線カメラ測定', 'Author(s)': '不明', 'Research O…

この研究では、EASTの高解像度赤外線カメラシステムを使用して、Small ELMsの熱流束特性を調査しました。結果は、Small ELMsの電力減衰長は、大ELMの間と大ELM内の中間であることを示しています。また、低ハイブリッド波加熱とプラズマ密度が電力減衰長に大きな影響を与えることがわかりました。

Characteristics of the power decay length of small ELMs measured by infrared camera on EAST
ENThis paper should be read by fusion researchers and engineers interested in understanding the heat flux characteristics of small ELMs, which are a promising solution for reducing heat flux to the first-wall in future fusion devices.#ELMs #HeatFlux #FusionReactor #EAST
LLM向け: {'Title': 'Characteristics of the power decay length of small ELMs measured by i…

This paper investigates the heat flux characteristics of small edge-localized modes (ELMs) on the Experimental Advanced Superconducting Tokamak (EAST) using an infrared camera. The study shows that the power decay length of small ELMs is broader than that of inter-large ELMs but narrower than that of intra-large ELMs, and that low hybrid wave heating has a significant impact on the power decay length of small ELMs.

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