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Multimachine analysis of intermittent fluctuations in the scrape-off layer of magnetically confined fusion plasmas

S Ahmed, S Allan, J-G Bak, J A Boedo, W G Fuller, O E Garcia, W Han, J Horacek, A Kirk, H S Kim2026年6月Plasma Physics and Controlled FusionIF 2.2出版社

Far scrape-off layer fluctuations, also known as blobs/filaments, are compared for the first time across six tokamaks: Alcator C-Mod, DIII-D, TCV, KSTAR, MAST, and MAST-U, under the context of stochastic modeling in Ohmic and low confinement mode scenarios. In this model, which well describes these fluctuations, measurements from Langmuir probes are modeled as a superposition of uncorrelated, two-sided exponential temporal pulses. The key parameters of this model are the mean waiting times between consecutive pulses, the pulse duration times and the mean of the pulse amplitudes. The study examines the influence of line-averaged density, plasma current, magnetic field and aspect ratio. The mean amplitudes and pulse waiting times increase with the line-averaged density across devices, while the pulse duration times remain constant. Whereas the variation in waiting times is gradual across the density scan, the mean amplitudes increase abruptly as the density profile broadens and flattens for Alcator C-Mod. The blob waiting times decrease with increasing plasma current and the toroidal magnetic field, while they increase with aspect ratio for conventional tokamaks. The duration times follow the same trends as the waiting times in these parameters but vary more slowly, resulting in the trends in the waiting times dominating the intermittency level of the fluctuations.

装置

alcator-c-mod中精度(概要文一致)diii-d中精度(概要文一致)kstar中精度(概要文一致)mast中精度(概要文一致)

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Scrape-off layer

AIによる論文要約

磁場閉じ込め核融合プラズマのスクレイプオフ層における間欠的変動のマルチマシン解析
JA核融合プラズマ物理の研究者や大学院生。特にトカマクのスクレイプオフ層輸送や乱流間欠性に興味がある方。#核融合 #プラズマ #トカマク #間欠的変動 #ブロブ
LLM向け: {"Title": "スクレイプオフ層の間欠的変動のマルチマシン比較", "Authors": "not specified", "Research Objec…

本論文は、6つのトカマク装置(Alcator C-Mod, DIII-D, TCV, KSTAR, MAST, MAST-U)におけるスクレイプオフ層の間欠的変動(ブロブ/フィラメント)を初めて比較した研究です。ラングミュアプローブの測定データを、非相関な両側指数パルスの重ね合わせとしてモデル化し、そのパラメータ(平均待ち時間、パルス持続時間、平均振幅)を解析しました。結果、平均振幅と待ち時間は線平均密度とともに増加し、パルス持続時間は一定であること、待ち時間はプラズマ電流やトロイダル磁場の増加で減少し、アスペクト比の増加で増加することがわかりました。特にAlcator C-Modでは密度プロファイルの拡大に伴い平均振幅が急増します。これらの傾向は間欠性のレベルを支配します。

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