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Modelling of measured tungsten spectra from ASDEX Upgrade and predictions for ITER

T Pütterich, R Neu, R Dux, A D Whiteford, M G OMullane, the ASDEX Upgrade Team2008年Plasma Physics and Controlled FusionIF 2.2出版社

Tungsten (W) has moved into the focus of fusion research being a main candidate for the plasma facing components (PFCs) of ITER and a future fusion reactor. A main ingredient for understanding the influence of W as a plasma impurity and its impact on the plasma is the spatially resolved spectroscopic diagnosis of W. The focus of the experimental investigations at ASDEX Upgrade is on the most intense emissions of W ions (about I-like W21+ to Mn-like W49+) in the VUV to the soft x-ray region covering the electron temperature range from about 0.5–5.0 keV. The relative shape of the fractional abundances of the ionization stages Se-like W40+ to Ni-like W46+ and of the bundle of ionization stages between Sn-like W24+ and Y-like W35+ was determined. Calculated fractional abundances using published ionization and recombination rates do not accurately describe the experimental temperature dependence. Adjustments to the recombination rates were calculated to reconcile with the measurements. The spectral features of W at 0.4–0.8 nm, around 5 nm, between 12 and 14 nm and between 10 and 30 nm have been recorded and compared with modelling results. The quality of agreement is best for highly charged ionization stages and short wavelengths and decreases for lower charged ionization stages and longer wavelengths. However, in the latter case the predictions manage to reproduce the total emissivity in each considered spectral range and also the rough distribution of emissions versus wavelengths within these spectral ranges. The modelling of the SXR range at 0.4–0.8 nm looks very similar to the measurement. Further observations of weaker spectral features between 0.6 and 0.7 nm, between 1.8 and 3.5 nm and at 8 nm could be attributed to certain ionization stages. The modelling of W spectra for ITER predicts emissions of Cr-like W50+ to about C-like W68+ at 0.1–0.15 nm, 1.8–4.0 nm and around 8 nm.

日本語訳

タングステン(W)は、ITERおよび将来の核融合炉におけるプラズマ対向機器(PFC)の主要候補材料として、核融合研究の焦点となっている。プラズマ不純物としてのWの影響と、そのプラズマへの影響を理解するための主要な手段は、Wの空間分解分光診断である。ASDEX Upgradeにおける実験研究の焦点は、約0.5~5.0 keVの電子温度範囲をカバーするVUVから軟X線領域における、Wイオン(約I様W21+からMn様W49+まで)の最も強い発光である。Se様W40+からNi様W46+までの電離段階の存在比の相対的分布、およびSn様W24+からY様W35+までの電離段階群の存在比の相対的分布が決定された。公表されている電離・再結合率を用いた計算による存在比は、実験で得られた温度依存性を正確に記述していない。測定結果と一致させるために、再結合率の調整が計算された。0.4~0.8 nm、約5 nm、12~14 nm、および10~30 nmにおけるWのスペクトル特徴が記録され、モデリング結果と比較された。一致の質は、高電離段階および短波長領域で最も良く、低電離段階および長波長領域では低下する。しかしながら、後者の場合、予測は各スペクトル領域における全放射率と、これらのスペクトル領域内での発光の大まかな波長分布を再現することに成功している。0.4~0.8 nmの軟X線領域のモデリングは、測定結果と非常に類似している。0.6~0.7 nm、1.8~3.5 nm、および8 nm付近におけるより弱いスペクトル特徴のさらなる観測は、特定の電離段階に帰属できる可能性がある。ITERのWスペクトルのモデリングは、0.1~0.15 nm、1.8~4.0 nm、および8 nm付近におけるCr様W50+から約C様W68+までの発光を予測している。

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