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- W2990876695 abstract "The retarding field analyzer (RFA) is considered as one of the most effective tools to measure the ion temperature (T i) in the plasma boundary. However, there are some inaccuracies in the measured T i by RFA, due to impurities in the plasma. In this paper, the influences of impurities on the measured T i by RFA have been analyzed in hydrogen isotope plasmas with both low-Z and high-Z impurities. The analytical results show that the T i is underestimated in H+ (also D+ and T+) plasma when the fuel ion charge is taken as the charge number and the analyzed T i in H+ are all larger than that in D+ and T+ plasmas, exhibiting the isotope effect. With the concentration of low-Z impurity (η l) increasing, the analyzed T i decreases and it is about 20% underestimated with η l~12%. Comparison of different charge numbers and masses of low-Z impurities, it is found that larger charge number and smaller mass of low-Z impurities lead to the analyzed T i being more underestimated. The high-Z impurities make almost no impact on the T i, due to their small current contribution. Moreover, the T i is measured by RFA and edge rotational diagnostic (ERD) system through experiments. The results show good agreement with the analytical evaluations." @default.
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- W2990876695 date "2020-01-07" @default.
- W2990876695 modified "2023-09-23" @default.
- W2990876695 title "The influence of impurities on ion temperature measured by a retarding field analyzer" @default.
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- W2990876695 doi "https://doi.org/10.1088/1361-6587/ab5bcf" @default.
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