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Interpretation of fast measurements of plasma potential, temperature and density in SOL of ASDEX Upgrade

J. Horacek, J. Adamek, H.W. Müller, J. Seidl, A.H. Nielsen, V. Rohde, F. Mehlmann, C. Ionita, E. Havlíčková, the ASDEX Upgrade Team2010年被引用 48Nuclear FusionIF 3出版社

This paper focuses on interpretation of fast (1 µs) and local (2–4 mm) measurements of plasma density, potential and electron temperature in the edge plasma of tokamak ASDEX Upgrade. Steady-state radial profiles demonstrate the credibility of the ball-pen probe. We demonstrate that floating potential fluctuations measured by a Langmuir probe are dominated by plasma electron temperature rather than potential. Spatial and temporal scales are found consistent with expectations based on interchange-driven turbulence. Conditionally averaged signals found for both potential and density are also consistent; however, those for temperature show an unexpected ∼4 mm wide decrease by 10% at the very centre of a blob. In the wall shadow, temperature measured by the swept Langmuir probe yields values ∼10 eV, whilst the ball-pen temperature gradient is more steep and credible, dropping down to ∼1 eV.

日本語訳

本論文は、トカマクASDEX Upgradeの周辺プラズマにおけるプラズマ密度、電位、電子温度の高速(1 µs)かつ局所的(2–4 mm)な測定の解釈に焦点を当てている。定常状態の動径プロファイルは、ボールペンプローブの信頼性を示している。ラングミュアプローブによって測定された浮遊電位変動は、電位ではなくプラズマ電子温度によって支配されることを示す。空間的・時間的スケールは、交換駆動乱流に基づく期待と一致することが見いだされた。電位と密度の両方について見いだされた条件付き平均信号も一致しているが、温度に関するものは、ブロブの最中心部で∼4 mm幅の10%の減少という予期しないものを示す。壁影では、掃引ラングミュアプローブによって測定された温度は∼10 eVの値を与えるが、ボールペンプローブの温度勾配はより急峻で信頼性が高く、∼1 eVまで低下する。

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asdex-upgrade高精度(タイトル一致)

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Fusion Advanced Studies TorusASDEXASDEX UpgradeScrape-off layerPlasma potential
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