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Statistical analysis of the ion flux to the JET outer wall

N.R. Walkden, A. Wynn, F. Militello, B. Lipschultz, G. Matthews, C. Guillemaut, J. Harrison, D. Moulton, JET Contributors2017年被引用 10Nuclear FusionIF 3出版社

Statistical analysis of the ion flux to the JET outer-wall is conducted in outer-wall limiter mounted Langmuir probe (OLP) time-series across a wide range of plasma current and line-averaged density during Ohmically heated horizontal target L-mode plasmas. The mean, μ, and the standard deviation, σ, of the ion-saturation current measured by the OLP show systematic variation with plasma current and density. Both increase as either plasma current decreases and/or density increases. Upon renormalization, achieved by subtraction of μ and rescaling by σ, the probability distribution functions (PDFs) of each signal collapse approximately onto a single curve. The shape of the curve deviates from a distribution in the tail of the PDF and is better described by a log-normal distribution. The invariance in the shape of the PDF, which occurs over approximately four decades of the ordinate, is shown to be the result of a balance between the duration time of the average burst wave-form, and the waiting time between bursts, . This implies that the intermittency parameter, , can be considered constant at the JET outer wall during horizontal target Ohmic L-mode operation. This result may be important both for model validation and prediction.

日本語訳

JET外壁へのイオン束の統計解析が、オーム加熱水平ターゲットLモードプラズマにおける広範囲のプラズマ電流および線平均密度にわたって、外壁リミター搭載ラングミュアプローブ(OLP)時系列を用いて実施された。OLPによって測定されたイオン飽和電流の平均値μおよび標準偏差σは、プラズマ電流と密度に応じて系統的な変化を示す。両者は、プラズマ電流の減少および/または密度の増加に伴って増大する。μの減算による再規格化とσによるスケーリングを行うと、各信号の確率分布関数(PDF)は近似的に単一の曲線上に重なる。この曲線の形状は、PDFの裾野において分布から逸脱し、対数正規分布によってより適切に記述される。縦軸の約4桁にわたって生じるPDFの形状の不変性は、平均バースト波形の持続時間とバースト間の待ち時間との間のバランスの結果であることが示される。これは、間欠性パラメータが、水平ターゲットオーム加熱Lモード運転中のJET外壁において一定とみなせることを示唆する。この結果は、モデルの検証と予測の両方にとって重要であり得る。

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