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The energy confinement response of DIII-D plasmas to resonant magnetic perturbations

L. Cui, R. Nazikian, B.A. Grierson, E.A. Belli, T.E. Evans, N.C. Logan, D.M. Orlov, S.P. Smith, G.M. Staebler, P.B. Snyder2017年被引用 17Nuclear FusionIF 3出版社

Resonant magnetic perturbations (RMPs) are a leading method for edge localized modes (ELMs) Control in fusion plasmas. However they can also cause a rapid degradation in energy confinement. In this paper we show that the energy confinement in low collisionality (  <  0.3) DIII-D ITER similar shape (ISS) plasmas often recovers after several energy confinement times for RMP amplitudes up to the threshold for ELM suppression. Immediately following the application of the RMP, the plasma stored energy decreases in proportion to the decrease in the line-averaged density during density 'pump-out'. Later in the discharge confinement recovery is observed in the thermal ion channel and is correlated with the increase in the ion temperature at the top of the H-mode pedestal. A correlation between the inverse scale length of the ion temperature () and the shearing rate at the top of the pedestal is seen during the confinement recovery phase. Transport analysis reveals that the confinement improvement in the ion channel results from the self-similarity in the ion temperature profiles in the plasma core combined with the observed increase in in the plasma edge following density pump-out. In contrast the electron temperature scale length () remains essentially unchanged in response to the application of the RMP. At significantly higher RMP levels the edge shearing rate and does not increase and the confinement does not recover following density pump-out.

日本語訳

共鳴磁場摂動(RMP)は、核融合プラズマにおける周辺局在モード(ELM)の制御の主要な手法である。しかし、RMPはエネルギー閉じ込めの急速な劣化を引き起こすこともある。本論文では、低衝突度(<0.3)のDIII-D ITER類似形状(ISS)プラズマにおいて、ELM抑制の閾値までのRMP振幅に対して、エネルギー閉じ込めが数回のエネルギー閉じ込め時間でしばしば回復することを示す。RMP印加直後には、プラズマ蓄積エネルギーは密度「ポンプアウト」中の線平均密度の減少に比例して減少する。その後、放電中に熱イオンチャネルでの閉じ込め回復が観測され、これはHモードペデスタル頂部でのイオン温度の上昇と相関する。閉じ込め回復期間中には、ペデスタル頂部でのイオン温度の逆スケール長()とシア流速度()の間に相関が見られる。輸送解析により、イオンチャネルでの閉じ込め改善は、密度ポンプアウト後のプラズマコアにおけるイオン温度分布の自己相似性と、プラズマ周辺部での観測された増加の組み合わせに起因することが明らかになる。対照的に、電子温度のスケール長()はRMP印加に対して本質的に不変のままである。RMP振幅が有意に高い場合、周辺部のシア流速度()と増加は見られず、密度ポンプアウト後も閉じ込めは回復しない。

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diii-d高精度(タイトル一致)iter中精度(概要文一致)

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DIII-DMagnetic perturbationResonant magnetic perturbationEnergy confinement
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