Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Evaluation of ECCD power requirement for neoclassical tearing modes suppression in the CFETR hybrid scenario

  • L.H. He (School of Nuclear Science and Technology, University of South China) ;
  • P.W. Zheng (School of Nuclear Science and Technology, University of South China) ;
  • T. Yu (School of Nuclear Science and Technology, University of South China)
  • Received : 2022.10.17
  • Accepted : 2023.04.29
  • Published : 2023.08.25
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Abstract

The optimal minimum ECCD power is evaluated numerically for completely suppressing the 3/2 and 2/1 NTMs in the CFETR hybrid scenario. For two typical frequencies of ECCD sources launching from two upper launcher (UL) ports, fec = 210 GHz and 240 GHz with O1-mode, UL1: (Ri, Zi) = (8.47, 5.7) m and UL2: (Ri, Zi) = (8.2, 4.5) m, higher frequency of ECCD source launching from the UL2 port is better than that low frequency counterpart from the UL1 port. Using 240 GHz ECCD source launching from the UL2 port, the minimum power required to fully suppress the two NTMs with precise ECCD alignment is 12.4 MW and 16.7 MW, respectively. When good alignment cannot be achieved, the results suggest that the misalignment should not exceed 0.02α, preferably 0.015α, corresponding to 4.4 cm and 3.3 cm. Considering engineering difficulty of high-frequency gyrotron sources, the optimal minimum ECCD power with the 210 GHz source launching from the UL2 port is 17.9 MW and 20.6 MW for completely suppressing the 3/2 and 2/1 NTMs, respectively. In view of this, it is a good choice to select the 210 GHz ECCD source launching from the UL2 port in the short and medium term.

Keywords

Acknowledgement

This work is supported by the National MCF Energy R & D Program (Grant Nos. 2022YFE03070003), the National Natural Science Foundation of China (Grant Nos. 12075114), the Natural Science Foundation of Hunan Province (No. 2021JJ30569), the Excellent Youth Project of Hunan Education Department (No.19B483), the Doctoral Initiation Fund Project of University of South China (No. 190XQD114), and the Opening Project of Nuclear Fuel Cycle Technology and Equipment, University of South China (No. 2019KFZ02, 2019KFQ12).

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