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Main chamber sources and edge transport of tungsten in H-mode plasmas at ASDEX Upgrade

R. Dux, A. Janzer, T. Pütterich, ASDEX Upgrade Team2011年被引用 64Nuclear FusionIF 3出版社

In the fully tungsten clad ASDEX Upgrade, the sputtering rates of tungsten have been determined at all relevant plasma facing components using fast spectroscopic measurements with temporal resolution down to 0.5 ms. The sputtering strongly increases during an edge-localized mode (ELM) and the ELMs are often the dominant cause of tungsten sputtering. A modelling approach was employed to calculate the tungsten source at the limiters and the resulting tungsten density at the pedestal top inside the H-mode edge transport barrier (ETB). In the ETB, it is assumed that tungsten transport is collisional, i.e. behaves like other impurities. The collisional transport leads to strong inward drifts and steep density gradients in the ETB, which are flattened during an ELM causing an efflux of tungsten. The collisional transport in the ETB is also calculated for typical ITER conditions and the resulting tungsten density profiles as well as the transport of the helium ash through the ETB are evaluated.

日本語訳

完全タングステン被覆ASDEX Upgradeにおいて、時間分解能0.5 msまでの高速分光測定を用いて、全ての関連するプラズマ対向機器におけるタングステンのスパッタリング率を決定した。スパッタリングはエッジ局在モード(ELM)中に強く増大し、ELMがタングステンスパッタリングの主要な原因となることが多い。Hモード周辺輸送障壁(ETB)内のリミッターにおけるタングステン源と、それに起因するペデスタル頂部でのタングステン密度を計算するために、モデリング手法を採用した。ETB内では、タングステン輸送は衝突的、すなわち他の不純物と同様に振る舞うと仮定される。衝突的輸送は、ETB内に強い内向きドリフトと急峻な密度勾配をもたらし、ELM中にはこれらが平坦化されてタングステンの流出を引き起こす。ETB内の衝突的輸送は、典型的なITER条件についても計算され、結果として得られるタングステン密度分布と、ETBを通したヘリウム灰の輸送が評価される。

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asdex-upgrade高精度(タイトル一致)iter中精度(概要文一致)

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TungstenASDEXASDEX UpgradeH-modeEdge transport
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