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Study of iron impurity behaviour in the ADITYA tokamak

S. Patel, A.K. Srivastava, M.B. Chowdhuri, R. Manchanda, A. Bhattacharya, J.V. Raval, U. Nagora, P.K. Atrey, R.L. Tanna, J. Ghosh2019年被引用 5Nuclear FusionIF 3出版社

Iron (Fe) impurity behaviour in ADITYA tokamak plasma has been studied using Fe spectral line emissions in the vacuum ultra violet (VUV) wavelength range. A VUV survey spectrometer has been utilized to record spectral lines at 28.41 nm from Fe14+ , and 33.54 nm and 36.08 nm from Fe15+ . It has been observed that the intensities of the Fe emissions decrease with an increase in plasma electron density. The observed emission and the intensity ratio of Fe14+ and Fe15+ ions from two discharges having relatively low and high plasma density are modelled using an impurity transport code. It is found that the observed data could be modelled using the same ratio of the convective velocity to the diffusion coefficient D profile, but with two different Fe concentrations. The ratio varies from the value of   −  0.22 m−1 at the plasma normalized radius to a maximum value of   −  0.35 m−1 at . The obtained diffusion coefficient value at the plasma core region is explained in terms of neo-classical transport, indicating that Fe impurity transport follows the same behaviour in the core plasma of the ADITYA tokamak.

日本語訳

ADITYAトカマクプラズマにおける鉄(Fe)不純物の挙動を、真空紫外(VUV)波長域におけるFeスペクトル線放射を用いて研究した。VUVサーベイ分光器を用いて、Fe14+からの28.41 nm、およびFe15+からの33.54 nmと36.08 nmのスペクトル線を記録した。Fe放射の強度は、プラズマ電子密度の増加とともに減少することが観測された。比較的低いプラズマ密度と高いプラズマ密度を有する2回の放電からのFe14+およびFe15+イオンの観測された放射と強度比を、不純物輸送コードを用いてモデル化した。観測データは、対流速度と拡散係数Dのプロファイルの同じ比を用いて、ただし2つの異なるFe濃度を用いてモデル化できることが見出された。この比は、プラズマ規格化半径において−0.22 m−1の値から、において−0.35 m−1の最大値まで変化する。プラズマコア領域で得られた拡散係数の値は、新古典輸送の観点から説明され、ADITYAトカマクのコアプラズマにおいてFe不純物輸送が同じ挙動を示すことを示している。

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