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Transport of argon and iron during a resonant magnetic perturbation at TEXTOR-DED

A Greiche, Y Liang, O Marchuk, G Bertschinger, W Biel, R Burhenn, R Dux, H R Koslowski, A Krämer-Flecken, K Löwenbrück2009年Plasma Physics and Controlled FusionIF 2.2出版社

Since ergodic divertors are proposed to control the impurity concentration in tokamak plasmas the influence of a resonant magnetic perturbation (RMP) from the dynamic ergodic divertor (DED) in the m/n = 3/1 mode on argon impurity transport is studied at the tokamak TEXTOR. Although the application of a DED current below the threshold for m/n = 3/1 tearing mode excitation in an NBI-heated L-mode plasma does not change the argon transport coefficients in r/a < 0.8, an additional transport mechanism within an error of 34% cannot be excluded. Observed changes of the iron ion density distribution for r/a < 0.6 can only be explained by a change of the transport. In addition the argon injection experiments show that an RMP reduces the inflow of particles into r/a < 0.8 and that a tearing mode seems to increase the local transport although at first view the experimental data indicate a reduction of the transport.

日本語訳

エルゴディック・ダイバータがトカマクプラズマ中の不純物濃度を制御するために提案されていることから、m/n = 3/1モードにおける動的エルゴディック・ダイバータ(DED)による共鳴磁場摂動(RMP)がアルゴン不純物輸送に及ぼす影響が、トカマクTEXTORにおいて研究されている。NBI加熱Lモードプラズマにおいてm/n = 3/1テアリングモード励起の閾値以下のDED電流を印加しても、r/a < 0.8におけるアルゴン輸送係数は変化しないが、34%の誤差範囲内で追加の輸送機構を排除することはできない。r/a < 0.6における鉄イオン密度分布の観測された変化は、輸送の変化によってのみ説明可能である。さらに、アルゴン注入実験により、RMPはr/a < 0.8への粒子流入を低減すること、またテアリングモードは局所輸送を増大させるように見えるが、一見したところ実験データは輸送の低減を示していることが明らかになった。

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Magnetic perturbationResonant magnetic perturbationTEXTORArgon
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