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Monitoring of two-dimensional tungsten concentration profiles on the HL-2A tokamak

Tianbo Wang, Bingli Li, Jinming Gao, Wulyu Zhong, Hui Li, Zengchen Yang, Jiang Min, Kairui Fang, Guoliang Xiao, Yiren Zhu, et al.
(2022) PLASMA PHYSICS AND CONTROLLED FUSION. 64(8).
Author
Organization
Abstract
In this article, we demonstrate the inference of two-dimensional tungsten concentration profiles in tokamak plasmas, using Gaussian process tomography applied to bolometry and assuming a specific model for the tungsten cooling factor. In ITER, tungsten has been selected for divertor material due to its low tritium retention and ability to handle large heat and particle flux loads. On the other hand, this will cause tungsten impurities to enter the bulk plasma through various plasma-wall interaction processes. Therefore, a detailed understanding of tungsten impurity transport and active control of the impurity transport in tokamaks is crucial. The computational complexity of the method described in their article O(n(2)m) compares favorably to a simple least-squares approach O (n(3)), n represents the number of pixels and m the number of measurement channels, hence bringing real-time tungsten profile monitoring within reach (<10 ms repetition time). The feasibility study of this method has been demonstrated here to a discharge in HL-2A for observing the entire process of tungsten impurities entering the bulk plasma from the scrape-off layer area, tungsten pump-out by edge-localized modes, as well as the formation of a poloidally asymmetric tungsten distribution.
Keywords
plasma impurities, tungsten, real-time tomography, Gaussian process, tomography

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MLA
Wang, Tianbo, et al. “Monitoring of Two-Dimensional Tungsten Concentration Profiles on the HL-2A Tokamak.” PLASMA PHYSICS AND CONTROLLED FUSION, vol. 64, no. 8, 2022, doi:10.1088/1361-6587/ac77b9.
APA
Wang, T., Li, B., Gao, J., Zhong, W., Li, H., Yang, Z., … Zou, X.-L. (2022). Monitoring of two-dimensional tungsten concentration profiles on the HL-2A tokamak. PLASMA PHYSICS AND CONTROLLED FUSION, 64(8). https://doi.org/10.1088/1361-6587/ac77b9
Chicago author-date
Wang, Tianbo, Bingli Li, Jinming Gao, Wulyu Zhong, Hui Li, Zengchen Yang, Jiang Min, et al. 2022. “Monitoring of Two-Dimensional Tungsten Concentration Profiles on the HL-2A Tokamak.” PLASMA PHYSICS AND CONTROLLED FUSION 64 (8). https://doi.org/10.1088/1361-6587/ac77b9.
Chicago author-date (all authors)
Wang, Tianbo, Bingli Li, Jinming Gao, Wulyu Zhong, Hui Li, Zengchen Yang, Jiang Min, Kairui Fang, Guoliang Xiao, Yiren Zhu, Mingkun Han, Jianqiang Xu, Didier Mazon, Geert Verdoolaege, Kai Zhang, Chunfeng Dong, Yipo Zhang, and Xiao-Lan Zou. 2022. “Monitoring of Two-Dimensional Tungsten Concentration Profiles on the HL-2A Tokamak.” PLASMA PHYSICS AND CONTROLLED FUSION 64 (8). doi:10.1088/1361-6587/ac77b9.
Vancouver
1.
Wang T, Li B, Gao J, Zhong W, Li H, Yang Z, et al. Monitoring of two-dimensional tungsten concentration profiles on the HL-2A tokamak. PLASMA PHYSICS AND CONTROLLED FUSION. 2022;64(8).
IEEE
[1]
T. Wang et al., “Monitoring of two-dimensional tungsten concentration profiles on the HL-2A tokamak,” PLASMA PHYSICS AND CONTROLLED FUSION, vol. 64, no. 8, 2022.
@article{01GV0ZY6WR6781F2KCS8Q0C24V,
  abstract     = {{In this article, we demonstrate the inference of two-dimensional tungsten concentration profiles in tokamak plasmas, using Gaussian process tomography applied to bolometry and assuming a specific model for the tungsten cooling factor. In ITER, tungsten has been selected for divertor material due to its low tritium retention and ability to handle large heat and particle flux loads. On the other hand, this will cause tungsten impurities to enter the bulk plasma through various plasma-wall interaction processes. Therefore, a detailed understanding of tungsten impurity transport and active control of the impurity transport in tokamaks is crucial. The computational complexity of the method described in their article O(n(2)m) compares favorably to a simple least-squares approach O (n(3)), n represents the number of pixels and m the number of measurement channels, hence bringing real-time tungsten profile monitoring within reach (<10 ms repetition time). The feasibility study of this method has been demonstrated here to a discharge in HL-2A for observing the entire process of tungsten impurities entering the bulk plasma from the scrape-off layer area, tungsten pump-out by edge-localized modes, as well as the formation of a poloidally asymmetric tungsten distribution.}},
  articleno    = {{084003}},
  author       = {{Wang, Tianbo and  Li, Bingli and  Gao, Jinming and  Zhong, Wulyu and  Li, Hui and  Yang, Zengchen and  Min, Jiang and  Fang, Kairui and  Xiao, Guoliang and  Zhu, Yiren and  Han, Mingkun and  Xu, Jianqiang and  Mazon, Didier and Verdoolaege, Geert and  Zhang, Kai and  Dong, Chunfeng and  Zhang, Yipo and  Zou, Xiao-Lan}},
  issn         = {{0741-3335}},
  journal      = {{PLASMA PHYSICS AND CONTROLLED FUSION}},
  keywords     = {{plasma impurities,tungsten,real-time tomography,Gaussian process,tomography}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{13}},
  title        = {{Monitoring of two-dimensional tungsten concentration profiles on the HL-2A tokamak}},
  url          = {{http://doi.org/10.1088/1361-6587/ac77b9}},
  volume       = {{64}},
  year         = {{2022}},
}
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