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Frequency control of type-I ELMs by magnetic triggering in ASDEX Upgrade

P T Lang, A W Degeling, J B Lister, Y R Martin, P J Mc Carthy, A C C Sips, W Suttrop, G D Conway, L Fattorini, O Gruber2004年Plasma Physics and Controlled FusionIF 2.2出版社

Magnetic triggering of edge localized modes (ELMs) was reported first from TCV in ohmic plasmas showing type-III ELMs. This method, showing successful locking of the ELM frequency to an imposed vertical plasma oscillation, has now also been demonstrated in the ITER-relevant type-I ELM regime in ASDEX Upgrade. Our experiments showed the ELM frequency becoming identical to the driving frequency in steady state for an applied motion of only about twice the value caused by an intrinsic ELM event. Triggered ELMs still showing clear type-I features were found when the plasma down-shift velocity reached its maximum, corresponding to the lowest edge current value. This is the opposite of the behaviour expected from the peeling–ballooning nature attributed to the ELM boundary and to TCV observations. The reason for this behaviour is not yet clear.

日本語訳

磁気閉じ込め核融合におけるエッジ局在モード(ELM)の磁気トリガーは、オーミックプラズマにおいてタイプIIIのELMを示すTCVで初めて報告された。この手法は、印加された垂直プラズマ振動へのELM周波数のロックを実証し、その後、ASDEX UpgradeにおけるITER関連のタイプI ELM領域でも実証された。我々の実験では、定常状態において、駆動周波数が固有のELM事象による周波数の約2倍に相当する値に設定された場合、ELM周波数が駆動周波数と一致することが示された。プラズマの下方シフト速度が最大値に達し、エッジ電流密度が最小値に対応する条件下で、トリガーされたELMは依然として明確なタイプIの特徴を示した。この結果は、ELM境界およびTCVでの観測結果に帰属されるピーリング・バルーニング特性から予想される挙動とは逆である。この挙動の理由は未だ明らかではない。

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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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ASDEXEdge localized modeASDEX Upgrade
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