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Heat transport in the JET scrape-off layer

S.K. Erents, P.C. Stangeby1998年被引用 32Nuclear FusionIF 3出版社

The DIVIMP/NIMBUS onion skin model (OSM) has been used to calculate 2-D plasma distributions of ne, Te and Ti in the JET edge, based on boundary conditions measured across the targets with built-in Langmuir probes. Ohmic, L mode and ELMy H mode discharges were analysed. From the calculated 2-D plasma profiles, values of χ⊥SOL(r) were extracted as a function of radial location within the SOL, showing that χ⊥SOL(r) increases with radius. At the separatrix χ⊥SOL(0) was in the range ∼0.05-1 m2·s-1, with the lowest values occurring for H modes (between ELMs). It was found that χ⊥SOL(r) ∼[Teu(r)]-2, where Teu is the electron temperature at the `upstream' end of the SOL flux tube. No clear correlation with the magnetic field, BT, was found. The results are not consistent with Bohm (χ⊥SOL ∝ Teu/B) scaling.

日本語訳

DIVINUS/NIMBUSオニオン・スキンモデル(OSM)を用いて、JET周辺部におけるne、Ti、Teの2次元プラズマ分布を、ターゲットに埋め込まれたラングミュアプローブで測定した境界条件に基づいて計算した。オーミック放電、Lモード放電、ELMy Hモード放電を解析した。計算された2次元プラズマ分布から、周辺部内の動径位置の関数としてχ⊥SOL(r)の値を導出し、χ⊥SOL(r)が半径とともに増加することを示した。セパラトリクスではχ⊥SOL(0)は約0.05〜1 m²/sの範囲にあり、Hモード(ELM間)で最も低い値となった。χ⊥SOL(r)は、SOLフラックスチューブの「上流」端における電子温度Teuに対して、χ⊥SOL(r) ∼ [Teu(r)]⁻²の関係があることが判明した。磁場BTとの明確な相関は見られなかった。これらの結果は、ボーム(χ⊥SOL ∝ Teu/B)スケーリングとは一致しない。

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JETScrape-off layerHeat transport
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