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Assessment of the Impact of Magnetic Equilibria Designs on the Stationary Plasma Heat Flux Deposition onto the CFETR First Wall

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Abstract

Quasi-snowflake-plus (QSF+) and the lower single null diverted (SND) magnetic equilibria have been proposed as the promising designs for the Chinese fusion engineering testing reactor (CFETR). The impact of these two candidate magnetic equilibria on the H-mode stationary plasma heat flux deposition onto the first wall has been assessed. Comparing the distributions of plasma heat flux on the CFETR first wall for QSF + and SND indicates that the SND is more beneficial for the engineering design of the first wall module, since the computational results prove that there is only one module of the first wall being recognized as the enhanced heat flux module (EHFM) in the case of SND. Meanwhile, due to the SND magnetic equilibrium is the baseline configuration used in the CFETR design work and \(\varDelta {R}_{\text{s}\text{e}\text{p}}\)is an important factor for plasma control system (PCS) during the tokamak operation, the impact of SND magnetic equilibria with a series of \(\varDelta {R}_{\text{s}\text{e}\text{p}}\) on the plasma heat flux deposition onto the first wall is further studied. Comparing the peak plasma heat flux on the CFETR first wall for SND with varying \(\varDelta {R}_{\text{s}\text{e}\text{p}}\) builds more confidences in using \(\varDelta {R}_{\text{s}\text{e}\text{p}}\)= 6 cm as the baseline SND equilibrium in the CFETR design work, where the plasma heat flux on the first wall is close to current engineering constraints of 1 MW/m2. With the baseline SND equilibrium design, the sensitivity of plasma heat flux to power decay length will not be a priority for the safety of the first wall.

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Availability of data and materials

The datasets generated during and/ or analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgments

The authors wish to thank the CFETR task team 1 for their great suggestions and help.

Funding

This work was supported by the National Key Research & Development Program of China under Contracts Nos. 2018YFE0303103, National Natural Science Foundation of China under Contract Nos. 11875287, 11705233, 12022511, 11861131010, and the Key Research Program of Frontier Sciences, CAS with Grant No. ZDBS-LYSLH010.

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Authors and Affiliations

  1. Institute of Plasma Physics, HFIPS, Chinese Academy of Sciences, Hefei, 230031, China

    Feifei Nian, Zhongshi Yang, Rui Ding, Guojian Niu, Bin Zhang, Rong Wang, Kedong Li, Tao He, Shouan Puyang & Guang-Nan Luo

  2. University of Science and Technology of China, 96 Jinzhai Road, Hefei, 230026, Anhui, China

    Feifei Nian, Rong Wang, Tao He, Shouan Puyang & Guang-Nan Luo

  3. College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China

    Hang Li

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  1. Feifei Nian
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  2. Zhongshi Yang
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  9. Tao He
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Contributions

F.N.: Conceptualization, methodology, validation, formal analysis, investigation, writing - original draft, writing - review & editing.

Z.Y.: conceptualization, methodology, validation, formal analysis, investigation, supervision, project administration, funding acquisition. H.L: conceptualization, methodology, validation, formal analysis, sources, data curation. R.D: conceptualization, methodology, validation, writing - review & editing, funding acquisition. G.N.: writing - review & editing, validation, funding acquisition. B.Z: sources, validation, software. R.W: writing - review & editing, validation, visualization. K.L.: writing - review & editing, data curation. T.H.: resources, validation. S.P.: resources, validation. G.L.: project administration.

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Correspondence to Zhongshi Yang.

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Nian, F., Yang, Z., Li, H. et al. Assessment of the Impact of Magnetic Equilibria Designs on the Stationary Plasma Heat Flux Deposition onto the CFETR First Wall. J Fusion Energ 42, 2 (2023). https://doi.org/10.1007/s10894-022-00340-w

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