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High resolution numerical studies of separatrix splitting due to non-axisymmetric perturbation in DIII-D

A. Wingen, T.E. Evans, K.H. Spatschek2009年被引用 70Nuclear FusionIF 3出版社

In DIII-D the splitting and deformation of the separatrix due to externally applied resonant magnetic perturbations is calculated using a vacuum field line integration code (TRIP3D–MAFOT). The resulting footprint pattern on the divertor target plates is shown in high resolution by contour plots of the connection lengths and penetration depths of the magnetic field lines. Substructures inside the divertor footprint stripes are discovered. Regions of deep penetrating long connecting field lines, which are related to the internal resonances by their manifolds, alternate with regions of regular short connecting field lines. The latter are identified as compact laminar flux tubes, which perforate the perturbed plasma region close to the x-point. The properties and consequences of such flux tubes are investigated in detail. The interaction of different resonant magnetic perturbations is analysed considering the separatrix manifolds. Constructive and destructive interference of the manifolds is discovered and studied.

日本語訳

DIII-Dにおいて、外部から印加された共鳴磁気摂動によるセパラトリックスの分裂と変形を、真空磁力線積分コード(TRIP3D–MAFOT)を用いて計算した。その結果得られたダイバータ板上のフットプリントパターンは、磁力線の接続長と侵入深さのコンター図により高解像度で示される。ダイバータフットプリントストライプ内部の微細構造が明らかになった。内部共鳴に関連する流多様体により、深く侵入する長い接続磁力線の領域と、規則的な短い接続磁力線の領域が交互に現れる。後者は、X点近傍の摂動プラズマ領域を貫通するコンパクトな層流磁束管として同定される。このような磁束管の特性とその影響について詳細に調査した。異なる共鳴磁気摂動の相互作用は、セパラトリックスの多様体を考慮して解析された。多様体の干渉による建設的・破壊的干渉が発見され、その特性が研究された。

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