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Investigation of heat flux deposition on divertor target on the Large Helical Device with EMC3-EIRENE modelling

Shuyu Dai, M Kobayashi, G Kawamura, S Masuzaki, H Tanaka, Y Suzuki, Y Feng, D Z Wang, the LHD Experimental Group2017年Plasma Physics and Controlled FusionIF 2.2出版社

The measured divertor heat flux profiles are compared to the EMC3-EIRENE simulations for two different times of an LHD discharge, corresponding to higher and lower edge temperatures. The relation between the three-dimensional magnetic field structure and the heat flux distributions on the divertor has been analysed. The modelled heat flux for the lower plasma temperature case has a better agreement with the experimental result obtained by the Langmuir probes, which shows a qualitative reproduction of the experimental profile shape. However, the heat flux distribution for the high plasma temperature case shows a different behaviour between the simulation results and the experimental measurements. The detailed analysis of the heat flux distribution for the higher temperature case which has a larger discrepancy has been performed, both quantitatively and qualitatively. The radiation of the eroded impurity from divertor target plates has a minor effect on the heat flux distribution. Non-uniform cross-field transport coefficients are used in the simulations and its impact on the heat flux distributions is discussed for the case of the high plasma temperature.

日本語訳

測定されたダイバータ熱流束プロファイルを、LHD放電の2つの異なる時刻(それぞれ高いおよび低い周辺プラズマ温度に対応)についてEMC3-EIRENEシミュレーションと比較した。3次元磁場構造とダイバータ上の熱流束分布との関係を解析した。低いプラズマ温度の場合、モデル化された熱流束はラングミュアプローブによって得られた実験結果とより良く一致し、実験プロファイル形状の定性的な再現を示した。しかし、高いプラズマ温度の場合、熱流束分布は実験測定と異なる挙動を示した。高い温度の場合の熱流束分布の不一致について、定量的および定性的の両面から詳細な解析を行った。ダイバータターゲット板から放出された不純物の放射は、高いプラズマ温度の場合の熱流束分布にわずかな影響しか与えなかった。非一様な横断輸送係数をシミュレーションで使用し、その影響を高いプラズマ温度の場合の熱流束分布に関して考察した。

装置

lhd高精度(タイトル一致)

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DivertorHelical deviceDivertor targetEMC3-EIRENE
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