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Magnetic perturbation experiments on MAST L- and H-mode plasmas using internal coils

A Kirk, Yueqiang Liu, E Nardon, P Tamain, P Cahyna, I Chapman, P Denner, H Meyer, S Mordijck, D Temple2011年Plasma Physics and Controlled FusionIF 2.2出版社

Experiments have been performed on MAST using internal (n = 3) resonant magnetic perturbation (RMP) coils. The application of the RMPs to L-mode discharges has shown a clear density pump-out when the field line pitch angle at the low-field side of the plasma is sufficiently well aligned with the applied field. The application of the RMPs before the L–H transition increases the power required to achieve H-mode by at least 30%. In type I ELMing H-mode discharges, at a particular value of q95, the ELM frequency can be increased by a factor of 5 by the application of the RMPs. This effect on the ELMs and the L-mode density pump-out is not correlated with the width of the region for which the Chirikov parameter, calculated using the vacuum field, is greater than 1 but may be correlated with the size of the resonant component of the applied field in the pedestal region or with the location of the peak plasma displacement when the plasma response is taken into account.

日本語訳

MASTにおいて、内部(n = 3)共鳴磁場摂動(RMP)コイルを用いた実験が実施された。Lモード放電へのRMPの印加は、プラズマ低磁場側における磁力線ピッチ角が印加磁場と十分に整合する場合に、明確な密度ポンプアウトを示した。L-H遷移前のRMP印加は、Hモード達成に必要なパワーを少なくとも30%増加させた。タイプI ELMを伴うHモード放電において、特定のq95値では、RMPの印加によりELM周波数を5倍に増加させることができる。ELMに対するこの効果とLモード密度ポンプアウトは、真空磁場を用いて計算したチリコフパラメータが1を超える領域の幅とは相関しないが、ペデスタル領域における印加磁場の共鳴成分の大きさ、あるいはプラズマ応答を考慮した場合のピークプラズマ変位の位置とは相関する可能性がある。

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mast高精度(タイトル一致)

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H-modeMagnetic perturbationMAST
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