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Outward particle transport by coherent mode in the H-mode pedestal in the Experimental Advanced Superconducting Tokamak (EAST)

T Zhang, X Han, X Gao, H Q Liu, T H Shi, J B Liu, Y Liu, D F Kong, Z X Liu, H Qu2017年Plasma Physics and Controlled FusionIF 2.2出版社

A coherent mode (CM) in the edge pedestal region has been observed on different fluctuation quantities, including density fluctuation, electron temperature fluctuation and magnetic fluctuation in H mode plasma on the Experimental Advanced Superconducting Tokamak (EAST) tokamak. Measurements at different poloidal positions show that the local poloidal wavenumber is smallest at the outboard midplane and will increase with poloidal angle. This poloidal asymmetry is consistent with the flute-like assumption (i.e. k// ∼ 0) from which the toroidal mode number of the mode has been estimated as between 12 and 17. It was further found that the density fluctuation amplitude of the CM also demonstrated poloidal asymmetry. The appearance of a CM can clearly decrease or even stop the increase in the edge density, while the disappearance of a CM will lead to an increase in the pedestal density and density gradient. Statistical analysis showed there was a trend that as the CM mode amplitude increased, the rate of increase of the edge density decreased and the particle flux (Γdiv) onto the divertor plate increased. The CM sometimes showed burst behavior, and these bursts led bursts on Γdiv with a time of about 230 μs, which is close to the time for particle flow from the outer midplane to the divertor targets along the scrape-off layer magnetic field line. This evidence showed that the CM had an effect on the outward transport of particles.

日本語訳

エッジペデスタル領域におけるコヒーレントモード(CM)が、実験先進超伝導トカマク(EAST)におけるHモードプラズマ中の異なる変動量(密度変動、電子温度変動、磁気変動)で観測された。異なるポロイダル位置での測定により、局所ポロイダル波数はアウトボード中平面で最小となり、ポロイダル角度とともに増加することが示された。このポロイダル非対称性はフルート状仮定(すなわちk// ∼ 0)と一致し、これに基づきモードのトロイダルモード数は12から17の間と推定された。さらに、CMの密度変動振幅もポロイダル非対称性を示すことが見出された。CMの出現はエッジ密度の増加を明確に減少させるか、あるいは停止させることができ、一方CMの消滅はペデスタル密度と密度勾配の増加をもたらすことが明らかになった。統計解析により、CMモード振幅が増加するにつれて、エッジ密度の増加率は減少し、ダイバータ板への粒子フラックス(Γdiv)は増加する傾向があることが示された。CMは時折バースト挙動を示し、これらのバーストは約230 μsの時間でΓdivにバーストを引き起こした。これは、スクレイプオフ層磁力線に沿ったアウターミッドプレーンからダイバータターゲットへの粒子流の時間に近い値である。この証拠は、CMが粒子の外向き輸送に影響を及ぼすことを示した。

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east高精度(タイトル一致)

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EASTH-modePedestalParticle transportH-mode pedestal
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