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X-point potential well formation in diverted tokamaks with unfavorable magnetic field direction

M. Wensing, J. Loizu, H. Reimerdes, B.P. Duval, M. Wischmeier, the TCV teama2020年被引用 24Nuclear FusionIF 3出版社

Fluid simulations of the boundary of fusion plasmas predict the formation of an electric potential well in the vicinity of the X-point in detached divertor conditions with Bt in the unfavorable direction for H-mode access. This potential well arises when the parallel current in the divertor is dominated by Pfirsch-Schlüter currents and is closely related to previously reported potential hill formation in favorable Bt direction. A simple analytic model describes its dependence on plasma shape and divertor conditions. The poloidal particle transport in the divertor is dominated by the parallel flow, while cross-field particle transport in the vicinity of the separatrix is argued to be E × B-dominated, even in the presence of turbulence. With a potential well, the E × B-flow differs qualitatively from the classic drift pattern with the near-SOL poloidal E × B-flux enhanced and reversed while radially widening/compressing the outer/inner divertor leg, respectively.

日本語訳

核融合プラズマ境界のシミュレーションは、Hモードアクセスに対して不利な方向のBtを有する非接触ダイバータ条件下において、X点近傍での電位井戸の形成を予測する。この電位井戸は、ダイバータ内の平行電流がプファーシュ・シュリュータ電流によって支配されるときに生じ、Hモードアクセスに対して有利な方向のBtにおける先行報告の電位丘の形成と密接に関連する。単純な解析モデルは、その依存性をプラズマ形状およびダイバータ条件の関数として記述する。ダイバータ内のポロイダル粒子輸送は平行流によって支配される一方、セパラトリクス近傍の横断方向粒子輸送は、乱流の存在下でもE×Bドリフトが支配的であると論じられる。電位井戸が存在する場合、E×Bフローは古典的なドリフトパターンとは質的に異なり、近スクレイプオフ層(SOL)のポロイダルE×Bフラックスは増強され、かつ反転する一方で、外側/内側ダイバータ脚部はそれぞれ径方向に拡大/圧縮される。

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