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Plasma edge transport phenomena caused by particle drifts and sources in TEXTOR

M. Lehnen, M. Brix, U. Samm, B. Schweer, B. Unterberg, the TEXTOR-team2003年被引用 20Nuclear FusionIF 3出版社

The parallel and radial transport properties of the plasma edge of TEXTOR are studied using radial electron density and temperature profiles as well as ion temperatures and poloidal velocities in the scrape-off layer (SOL). These quantities are measured by thermal helium beams at the low (LFS) and high field side (HFS) by emission and beam driven charge exchange recombination spectroscopy. We investigate the influence of the safety factor and of a magnetic field reversal on these edge parameters. Especially the field reversal leads to clear effects: a decrease of the density at the LFS, a significant change in the poloidal density distribution, which is identified by comparing LFS and HFS densities, and an increase in the density e-folding length at both poloidal positions. The poloidal ion rotation changes sign in reversed field configuration and thus gives a hint on the role of poloidal drifts in the SOL. For further analysis, we present a simple fluid model including poloidal drift velocities and local ionization sources. With this model we can show that the poloidal E×B drift clearly influences the poloidal density distribution. However, although the model results show the same tendencies as the experimental findings, the impact of the field reversal on the density asymmetry is not that pronounced as in the experiment. The dependence of the density e-folding length on the poloidal and radial drifts as well as on the source distribution is discussed within the frame of analytical estimates.

日本語訳

TEXTORプラズマ端部の平行および径方向輸送特性を、径方向の電子密度・温度プロファイル、ならびにスクレイプオフ層(SOL)におけるイオン温度とポロイダル速度を用いて研究した。これらの量は、低磁場側(LFS)および高磁場側(HFS)において、熱ヘリウムビームによる発光とビーム駆動電荷交換再結合分光法によって測定される。我々は、安全係数と磁場反転がこれらの端部パラメータに及ぼす影響を調べた。特に、磁場反転は明確な効果をもたらす:LFSでの密度減少、LFSとHFSの密度比較により同定されるポロイダル密度分布の有意な変化、および両ポロイダル位置での密度e-folding長の増加である。ポロイダルイオン回転は反転磁場配位で符号を変え、SOLにおけるポロイダルドリフトの役割を示唆する。さらなる解析のため、ポロイダルドリフト速度と局所イオン化源を含む簡単な流体モデルを提示する。このモデルにより、ポロイダルE×Bドリフトがポロイダル密度分布に明確に影響することが示される。しかし、モデル結果は実験結果と同じ傾向を示すものの、磁場反転が密度非対称性に及ぼす影響は実験ほど顕著ではない。密度e-folding長のポロイダルおよび径方向ドリフト、ならびにイオン化源分布への依存性は、解析的評価の枠組みで議論される。

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textor高精度(タイトル一致)

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TEXTOREdge transport
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