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Density pump-out compensation during type-I edge localized mode control experiments with n = 1 perturbation fields on JET

S Saarelma, A Alfier, Y Liang, L Frassinetti, M Beurskens, S Jachmich, H R Koslowski, P Lang, R Pasqualotto, Y Sun2011年Plasma Physics and Controlled FusionIF 2.2出版社

Experiments to balance the density pump-out effect during edge localized mode (ELM) control through the application of an n = 1 magnetic perturbation in type-I H-mode plasmas at JET are presented, describing the effect on Te, ne and pe profiles. Reference discharges during H-mode with and without resonant magnetic perturbation are first considered, and compared with results obtained in previous work. Pellet and gas injection are the two applied techniques; on the basis of previous experience, various particle fuelling rates have been tested on two different divertor configurations, finding those for which the compensation takes place. In terms of plasma confinement, while core pressure is found to be almost unvaried with the particle fuelling, the edge pressure pedestal improves towards the value obtained during the H-mode without the application of the magnetic perturbation. The edge stability analysis shows that the mitigated edge plasma even with the addition of particle fuelling is in the stable region against the type-I ELM triggering peeling–ballooning modes.

日本語訳

エッジ局在モード(ELM)制御中の密度ポンプアウト効果を、JETにおけるタイプI Hモードプラズマへのn = 1磁場摂動の印加によってバランスさせる実験について報告する。Te、ne、pe分布に対する影響を記述する。共鳴磁場摂動の有無によるHモード中の参照放電をまず検討し、これまでに得られた結果と比較する。ペレット入射とガス入射が適用される2つの手法であり、これまでの経験に基づき、2つの異なるダイバータ配位において様々な粒子供給率が試験され、補償が生じる条件が見出された。プラズマ閉じ込めに関しては、コア圧力は粒子供給によってほぼ変化しないことが見出される一方、エッジ圧力ペデスタルは、磁場摂動を印加しないHモードで得られる値に向かって改善する。エッジ安定性解析により、粒子供給を追加した場合でも、緩和されたエッジプラズマは、タイプI ELMを引き起こすピーリング・バルーニングモードに対して安定領域にあることが示される。

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jet高精度(タイトル一致)

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JETEdge localized mode
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