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Dependence on plasma shape and plasma fueling for small edge-localized mode regimes in TCV and ASDEX Upgrade

B. Labit, T. Eich, G.F. Harrer, E. Wolfrum, M. Bernert, M.G. Dunne, L. Frassinetti, P. Hennequin, R. Maurizio, A. Merle2019年被引用 34Nuclear FusionIF 3出版社

Within the EUROfusion MST1 work package, a series of experiments has been conducted on AUG and TCV devices to disentangle the role of plasma fueling and plasma shape for the onset of small ELM regimes. On both devices, small ELM regimes with high confinement are achieved if and only if two conditions are fulfilled at the same time. Firstly, the plasma density at the separatrix must be large enough (), leading to a pressure profile flattening at the separatrix, which stabilizes type-I ELMs. Secondly, the magnetic configuration has to be close to a double null (DN), leading to a reduction of the magnetic shear in the extreme vicinity of the separatrix. As a consequence, its stabilizing effect on ballooning modes is weakened.

日本語訳

EUROfusion MSTMワークパッケージ内において、小型ELM体制の発生に対するプラズマ燃料供給とプラズマ形状の役割を解明するため、AUGおよびTCV装置において一連の実験が実施された。両装置において、高閉じ込めを伴う小型ELM体制は、2つの条件が同時に満たされた場合にのみ達成される。第一に、セパラトリックスにおけるプラズマ密度が十分に高くなければならず()、これによりセパラトリックスでの圧力分布の平坦化が生じ、type-I ELMを安定化する。第二に、磁気配位がダブルヌル(DN)に近い状態でなければならず、これによりセパラトリックスの極近傍における磁気シアが低減する。その結果、バルーニングモードに対するその安定化効果は弱められる。

装置

asdex-upgrade高精度(タイトル一致)

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ASDEXEdge localized modeASDEX UpgradeTCV
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