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Extended MHD simulation of resonant magnetic perturbations

H.R. Strauss, L. Sugiyama, G.Y. Park, C.S. Chang, S. Ku, I. Joseph2009年被引用 44Nuclear FusionIF 3出版社

Resonant magnetic perturbations (RMPs) have been found effective in suppressing edge localized modes (ELMs) in the DIII-D experiment (Evans et al 2006 Phys. Plasmas13 056121, Moyer et al 2005 Phys. Plasmas12 056119). Simulations with the M3D initial value code indicate that plasma rotation, due to an MHD toroidal rotation or to two-fluid drifts, has an essential effect on the RMP. When the flow is below a threshold, the RMP field can couple to a resistive mode with a helical structure, different from the usual ELM, that amplifies the non-axisymmetric field. The magnetic field becomes stochastic in the outer part of the plasma, causing density and temperature loss. At higher rotation speed, the resistive mode is stabilized and the applied RMP is screened from the plasma, so that the stochastic magnetic layer is thinner and the temperature remains similar to the initial unperturbed state. The rotational flow effects, along with the remnants of the screened RMP, cause a density loss which extends into the plasma core. The two-fluid model contains intrinsic drift motion and axisymmetric toroidal rotation may not be needed to screen the RMP nor stabilize the resistive mode.

日本語訳

共鳴磁場摂動(RMP)は、DIII-D実験においてエッジ局在モード(ELM)の抑制に有効であることが見出されている(Evans et al 2006 Phys. Plasmas13 056121, Moyer et al 2005 Phys. Plasmas12 056119)。M3D初期値コードを用いたシミュレーションは、MHDトロイダル回転または二流体ドリフトによるプラズマ回転がRMPに本質的な影響を与えることを示している。流れが閾値以下の場合、RMP場は通常のELMとは異なる螺旋構造を持つ抵抗性モードと結合し、非軸対称場を増幅する可能性がある。磁場はプラズマの外側部分で確率的になり、密度と温度の損失を引き起こす。より高い回転速度では、抵抗性モードは安定化され、印加されたRMPはプラズマから遮蔽されるため、確率的磁場層は薄くなり、温度は初期の非摂動状態と同様のままとなる。回転流の効果は、遮蔽されたRMPの残存とともに、プラズマコアにまで及ぶ密度損失を引き起こす。二流体モデルは固有のドリフト運動を含み、軸対称トロイダル回転はRMPの遮蔽や抵抗性モードの安定化に必ずしも必要ではない可能性がある。

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diii-d中精度(概要文一致)

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MagnetohydrodynamicsMagnetic perturbationResonant magnetic perturbation
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