Experimental and theoretical study of weakly coherent mode in I-mode edge plasmas in the EAST tokamak

Liu, Z. X.; Liu, Y. J.; Xiao, J. Y.; Xia, T. Y.; Li, Y. L.; Xu, X. Q.; Wu, M. Q.; Li, G. Q.; Wu, M. F.; Zhang, T.; Gao, X.; Gong, X. Z.; Liu, H. Q.; Zang, Q.; Liu, A. D.; Zhou, C.; Lan, T.; Li, H.; Xie, J. L.; Mao, W. Z.; Ding, W. X.; Zhuang, G.; Li, J. G.; Liu, W. D.

doi:10.1088/1741-4326/ac7537

Title: Experimental and theoretical study of weakly coherent mode in I-mode edge plasmas in the EAST tokamak

Journal Article · 22 June 2022 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/ac7537 · OSTI ID:1959518

Liu, Z. X. ^[1];

^[1]; Xiao, J. Y. ^[1]; Xia, T. Y. ^[2];

^[3]; Xu, X. Q. ^[4];

^[5]; Li, G. Q. ^[2]; Wu, M. F. ^[3];

^[2];

^[2]; Gong, X. Z. ^[2];

^[2]; Zang, Q. ^[2];

^[1]; Zhou, C. ^[1];

^[1]; Li, H. ^[1]; Xie, J. L. ^[1];

^[1] more »

Univ. of Science and Technology of China, Hefei (China)
Chinese Academy of Sciences (CAS), Hefei (China)
Univ. of Science and Technology of China, Hefei (China); Chinese Academy of Sciences (CAS), Hefei (China)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Shenzhen Univ. (China)

The I-mode is a promising operation mode for fusion in the future, featuring high-temperature and low-density confinement, but the reason why the temperature and density are decoupled remains an important aspect to be explored. The experimental results from the experimental advanced superconducting tokamak (EAST) showed that the weakly coherent mode (WCM) is directly related to sustaining the I-mode and that the peak amplitude of the WCM is proportional to the temperature in the pedestal. Here, simulating the experimental data from EAST with the six-field model of BOUT++, we find a density perturbation close to the frequency of the WCM observed in the experiment. By testing all the physical terms in this model, we find that the density perturbation and particle transport are directly related to the drift Alfvén wave (DAW) mode. Additionally we use the SymPIC program (Xiao et al Plasma Sci. Technol. 20 110501; Phys. Plasmas 22 112504; Plasma Sci. Technol. 23 055102) to simulate the same experimental data and find that the frequency range of the WCM is close to both experimental and BOUT++ results. Therefore, the WCM of the I-mode can be considered to be driven by the DAW, which helps improve the transport of the I-mode.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Magnetic Confinement Fusion Program of China; National Natural Science Foundation of China (NSFC); Chinese Academy of Sciences

Contributing Organization:: EAST Team

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1959518

Report Number(s):: LLNL-JRNL-844653; {"Journal ID: ISSN 0029-5515",1068100}

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 8 Vol. 62; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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