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Vacuum modeling of three-dimensional magnetic field topology under resonant magnetic perturbations on EAST

M Jia, Y Sun, F Zhong, H Li, G Li, L Wang, K Gan, B Zhang, J Qian, B Shen2016年Plasma Physics and Controlled FusionIF 2.2出版社

A numerical model using field line tracing for modeling of three-dimensional magnetic field topology under resonant magnetic perturbations (RMPs) on experimental advanced superconducting tokamak (EAST) is presented. The topological structure is calculated in the vacuum paradigm. The modeling result predicts that the possible strike point splitting on a plasma-facing component and the lobes-like structure on the boundary are observable in the diagnostics at different locations. It is shown that the magnetic perturbations with a resonant dominant spectrum can induce a large footprint splitting effect as well as a wide stochastic layer. This is useful for observations using diagnostics with limited spatial resolution. The impact of RMP fields on marginally disconnected double null configurations is investigated. To avoid the transient heat load on the upper divertor or plasma-facing components near the upper x-point, it is necessary to keep the distance between two separatrices of a near double null configuration larger than a threshold value that depends on the RMP strength and the equilibrium properties. A preliminary RMP experiment on EAST shows that there is a good agreement between the splitting width predicted by the code and that of the particle flux measured by divertor probes. An enhancement of particle flux on the upper divertor during the RMP phase is observed in the lower single null discharge.

日本語訳

EASTにおける共鳴磁場摂動(RMP)下での三次元磁場トポロジーのモデリングのための磁力線追跡を用いた数値モデルを提示する。トポロジー構造は真空近似で計算される。モデリング結果は、プラズマ対向部品上でのストライク点の分裂と、異なる位置での診断において観測可能なローブ状構造を予測する。共鳴スペクトルを有する磁場摂動が、大きなフットプリント分裂効果と広い確率層を誘起できることが示される。これは、空間分解能が限られた診断を用いた観測に有用である。RMP場がわずかに非平衡な二重ヌル配位に及ぼす影響を調査する。上部ダイバータまたは上部X点近傍のプラズマ対向部品への過渡的な熱負荷を回避するためには、RMP強度と平衡特性に依存する閾値よりも、ほぼ二重ヌル配位の二つのセパラトリックス間の距離を大きく保つ必要がある。EASTでの予備的なRMP実験では、コードによって予測された分裂幅と、ダイバータプローブによって測定された粒子束の間に良好な一致が見られる。下部単一ヌル放電において、RMP位相中に上部ダイバータでの粒子束の増強が観測される。

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EASTMagnetic perturbationResonant magnetic perturbation
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