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Boundary perturbations coupled to core 3/2 tearing modes on the DIII-D tokamak

B Tobias, L Yu, C W Domier, N C Luhmann Jr, M E Austin, C Paz-Soldan, A D Turnbull, I G J Classen, the DIII-D Team2013年Plasma Physics and Controlled FusionIF 2.2出版社

High confinement (H-mode) discharges on the DIII-D tokamak are routinely subject to the formation of long-lived, non-disruptive magnetic islands that degrade confinement and limit fusion performance. Simultaneous, 2D measurement of electron temperature fluctuations in the core and edge regions allows for reconstruction of the radially resolved poloidal mode number spectrum and phase of the global plasma response associated with these modes. Coherent, n = 2 excursions of the plasma boundary are found to be the result of coupling to an n = 2, kink-like mode which arises locked in phase to the 3/2 island chain. This coupling dictates the relative phase of the displacement at the boundary with respect to the tearing mode. This unambiguous phase relationship, for which no counter-examples are observed, is presented as a test for modeling of the perturbed fields to be expected outside the confined plasma.

日本語訳

DIII-Dトカマクにおける高閉じ込め(Hモード)放電は、閉じ込めを劣化させ核融合性能を制限する、長寿命で非破壊的な磁気島の形成を日常的に受ける。コア領域とエッジ領域における電子温度揺動の同時2次元計測により、これらのモードに関連する全球プラズマ応答の動径分解されたポロイダルモード数スペクトルと位相の再構成が可能となる。プラズマ境界におけるコヒーレントなn=2の変位は、3/2島に位相ロックしたn=2キンク様モードとの結合の結果であることが見出される。この結合が、境界における変位のテアリングモードに対する相対位相を決定する。この曖昧さのない位相関係は、反例が存在せず、閉じ込めプラズマ外部で予想される摂動磁場のモデリングに対する検証手段として提示される。

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diii-d高精度(タイトル一致)

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DIII-DTearing mode
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