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Driving mechanism of SOL plasma flow and effects on the divertor performance in JT-60U

N. Asakura, H. Takenaga, S. Sakurai, G.D. Porter, T.D. Rognlien, M.E. Rensink, K. Shimizu, S. Higashijima, H. Kubo2004年被引用 76Nuclear FusionIF 3出版社

The measurements of the SOL flow and plasma profiles both at the high-field-side (HFS) and low-field-side (LFS), for the first time, identified the SOL flow pattern and its driving mechanism. 'Flow reversal' was found near the HFS and LFS separatrix of the main plasma for the ion ∇B drift direction towards the divertor. 'Flow reversal' at the main SOL was reproduced numerically using the UEDGE code with the plasma drifts included although Mach numbers in measurements were greater than those obtained numerically. Particle fluxes towards the HFS and LFS divertors produced by the parallel SOL flow and Er × B drift flow were evaluated from the measured profiles of Mach numbers, the density and the radial electric field. The drift flux in the private flux region was also evaluated, and it was found that its contribution to the HFS-enhanced asymmetry of the divertor particle flux was larger than the ion flux from the HFS SOL. The ion flux for the intense gas puff and divertor pump ('puff and pump') was investigated, and it was found that both the Mach number and density were enhanced, in particular, at the HFS. Ion flux at the HFS SOL can be enhanced so as to become larger than the drift flux in the private flux region.

日本語訳

SOL流とプラズマ分布の測定を、高磁場側(HFS)と低磁場側(LFS)の両方において初めて行い、SOL流のパターンとその駆動機構を特定した。イオンの∇Bドリフト方向がダイバータに向かう場合、主プラズマのHFSおよびLFSセパラトリクス近傍で「流れの反転」が観測された。主SOLにおける「流れの反転」は、プラズマドリフトを含むUEDGEコードを用いた数値計算により再現されたが、測定されたマッハ数は数値計算で得られた値よりも大きかった。HFSおよびLFSダイバータへの粒子束は、平行SOL流とEr×Bドリフト流によって生じ、測定されたマッハ数分布、密度分布、および径方向電場分布から評価された。プライベートフラックス領域におけるドリフト流も評価され、ダイバータ粒子束のHFS強調非対称性に対するその寄与は、HFS SOLからのイオン流よりも大きいことが見出された。高強度ガス入射とダイバータポンプ(「パフ・アンド・ポンプ」)によるイオン流が調査され、マッハ数と密度の両方が、特にHFSにおいて増強されることが見出された。HFS SOLにおけるイオン流は、プライベートフラックス領域のドリフト流よりも大きくなるように増強され得る。

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DivertorScrape-off layerJT-60UPlasma flow
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