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Comparison of plasma turbulence in the low- and high-field Scrape-Off Layers in the T-10 tokamak

G.S. Kirnev, V.P. Budaev, S.A. Grashin, L.N. Khimchenko, D.V. Sarytchev2005年被引用 37Nuclear FusionIF 3出版社

Experimental investigation of the Scrape-Off Layer (SOL) turbulence and the perpendicular anomalous particle transport in the high density regime in the T-10 tokamak is presented. Comparison of the plasma parameters measured at the low-field side (LFS) and the high-field side (HFS) of the tokamak shows that the inboard turbulence essentially differs from the outboard one. Turbulence has an intermittent character but the fluctuation level of the inboard ion saturation current is about two times lower than at the LFS. The radial turbulent particle flux and the effective perpendicular diffusion coefficient measured at the LFS are about 3–5 times higher than those observed at the HFS. Enhanced perpendicular particle flux at the LFS is defined by the high density plasma structures formed in the vicinity of the last closed flux surface. The poloidal electric field inside the high density structures has different directions at the inboard and outboard sides of the plasma column. The radial electric drift induced by the poloidal electric field is directed towards the vacuum vessel at both the LFS and the HFS. These experiments support the hypothesis that SOL parallel flow might be caused by an additional mechanism such as 'ballooning' transport, which generates a larger flux of particles from the core into the SOL at the outer mid-plane.

日本語訳

T-10トカマクにおける高密度領域でのスクレイプオフ層(SOL)乱流と垂直方向の異常粒子輸送の実験的調査を提示する。トカマクの低磁場側(LFS)と高磁場側(HFS)で測定されたプラズマパラメータの比較は、内側の乱流が外側のものと本質的に異なることを示している。乱流は間欠的性質を持つが、内側のイオン飽和電流の変動レベルはLFSの約2倍低い。LFSで測定された半径方向の乱流粒子フラックスと実効垂直拡散係数は、HFSで観測されたものより約3〜5倍高い。LFSでの垂直粒子フラックスの増強は、最終閉磁気面の近傍に形成される高密度プラズマ構造によって決定される。高密度構造内部のポロイダル電場は、プラズマ柱の内側と外側で異なる方向を持つ。ポロイダル電場によって誘起される半径方向の電気ドリフトは、LFSとHFSの両方で真空容器に向かって方向づけられる。これらの実験は、SOL平行流が、外側中平面でコアからSOLへのより大きな粒子フラックスを生成する『バルーニング』輸送などの追加のメカニズムによって引き起こされる可能性があるという仮説を支持する。

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Scrape-off layerPlasma turbulence
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