Speaker
Description
The Chinese Fusion Engineering Test Reactor (CFETR) is designed as the next fusion device in China aiming to bridge the gaps between the fusion experimental reactor ITER and the demonstration reactor (DEMO). The current EAST tokamak will provide a long-pulse, high power test bench for advanced operation scenarios under actively cooled metal wall condition for CFETR [1]. To achieve long-pulse and high power steady state operation on EAST, impurity accumulation is one of the key issues should be considered. Therefore, studies on impurity transport become important.
Carbon is one of the major intrinsic impurities in EAST. Additionally, Lithium may exist through the dedicated Lithium-related experiment by Li-pellet injection in the experiment or through wall conditioning by lithiation. On EAST, a new vacuum ultraviolet (VUV) imaging system is developing. It selectively measures the emission with 13.5 nm in wavelength, which is mainly contributed by C VI (n = 4-2 transition), or the Ly-α line emission from Li III on EAST. In this work, a new method is proposed to evaluate the distribution of C5+ and Li2+ from the VUV imaging data. In this proposal, the evolutions of the impurity profiles are calculated by the 1D transport model. With the measured electron temperature and density profiles, the emissivity can be estimated. Then, the VUV images can be simulated. Finally, the impurity distributions can be obtained by fitting the simulated images and experimental images.
Acknowledgments
This work is supported by the Natural Science Foundation of China under Contract No. 11605244 and the National Magnetic Confinement Fusion Science Program of China under Contract No. 2014GB106000, 2014GB106001 and 2013GB106000.
References
[1] Y. X. Wan et al., 2016 26th IAEA Fusion Energy Conference, Kyoto, 17-22 Oct. 2016, Paper No. OV/3-4.
| Eligible for student paper award? | Yes |
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