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Accurate measurement and interpretation of the heat flux to the divertor in TEXT Upgrade

D. Storek, K.W. Gentle2001年被引用 9Nuclear FusionIF 3出版社

To obtain accurate measurements of the heat flux to divertor tiles for comparison with probe data in the SOL and with models, digitized infrared camera data were calibrated and corrected for tile emissivity to provide true tile surface temperatures. The surface temperature T(x,y,t) was analysed with a full three dimensional heat flux code, including temperature dependent thermal properties, to extract the heat flux to the divertor tiles in the TEXT Upgrade tokamak. Each of the complexities in the analysis proved necessary for precise results. The parallel heat flux at the separatrix was generally consistent with independently measured edge parameters: a sheath transmission coefficient of ∼5 is inferred. The flux to the tiles varied with cosθinc as expected. The decay length for heat flux in the SOL did not vary significantly with conditions and remained ∼2.5 mm (traced to the outer midplane), which is significantly shorter than that implied by density and temperature scale lengths in the SOL.

日本語訳

ダイバータタイルへの熱流束の正確な測定を得るために、SOL内のプローブデータおよびモデルとの比較を行うため、デジタル化された赤外線カメラデータを較正し、タイルの放射率を補正して、真のタイル表面温度を提供した。表面温度T(x,y,t)は、温度依存性のある熱物性を含む完全な三次元熱流束コードを用いて解析し、TEXTアップグレードトカマクのダイバータタイルへの熱流束を抽出した。解析における複雑さの各要素は、正確な結果を得るために必要であることが証明された。セパラトリクスにおける平行熱流束は、独立に測定された境界パラメータと概ね一致しており、シース透過係数は約5と推定される。タイルへの熱流束は、cosθincに応じて期待通りに変化した。SOLにおける熱流束の減衰長は、条件によって有意に変化せず、約2.5mm(外側中平面までトレースした場合)のままであり、これはSOL内の密度および温度のスケール長から示唆される値よりも有意に短い。

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