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Turbulent transport in the scrape-off layer of Wendelstein 7-X

Carsten Killer, Yann Narbutt, Olaf Grulke, the W7-X Team2021年被引用 7Nuclear FusionIF 3出版社

Turbulent transport is widely considered to be the main driver for cross-field transport in the scrape-off layer (SOL) of toroidal magnetized plasmas. Here, reciprocating Langmuir probes are employed to measure both the plasma profiles and the turbulent particle transport in the SOL of the Wendelstein 7-X stellarator. The relation between turbulent radial particle flux Γr and the local pressure gradient is often approximately linear across the entire SOL width, indicating that radial turbulence spreading is absent. This observation holds across a wide range of magnetic configurations and different plasma heating and density scenarios. The magnitude of the turbulent transport for a given gradient reveals a dependence on the magnetic configuration and the position in the SOL, which we relate to the cross-spectral characteristics of multi-tip floating potential measurements. Magnetic islands can add further complexity due to non-monotonic SOL profiles and the breaking of the transport-gradient relation. Finally, anomalous diffusion coefficients are determined from the probe measurements.

日本語訳

乱流輸送は、トロイダル磁化プラズマのスクレイプオフ層(SOL)における断面方向輸送の主要な駆動機構であると広く考えられている。ここでは、ラングミュアプローブを用いて、Wendelstein 7-XステラレータのSOLにおけるプラズマプロファイルと乱流粒子輸送の両方を測定した。乱流動径粒子束Γrと局所圧力勾配の関係は、SOL全体にわたってほぼ線形であることが多く、動径方向の乱流拡散が存在しないことを示している。この観測結果は、広範囲の磁気配位および異なるプラズマ加熱・密度条件下で成り立つ。所与の勾配に対する乱流輸送の大きさは、磁気配位とSOL内の位置に依存することが明らかになり、これは多探針浮遊電位測定の相互スペクトル特性と関連付けられる。磁気島は、非単調なSOLプロファイルと輸送・勾配関係の破れにより、さらなる複雑さをもたらす可能性がある。最後に、プローブ測定から異常拡散係数が決定される。

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wendelstein-7x高精度(タイトル一致)

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Scrape-off layerWendelsteinTurbulent transport
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