Experimental study of core MHD behavior and a novel algorithm for rational surface detection based on profile reflectometry in EAST

Kaixuan YE; Zhen ZHOU; Tao ZHANG; Jiuyang MA; Yumin WANG; Gongshun LI; Kangning GENG; Mingfu WU; Fei WEN; Jia HUANG; Yang ZHANG; Linming SHAO; Shuqi YANG; Fubin ZHONG; Shanlu GAO; Lin YU; Ziqiang ZHOU; Haoming XIANG; Xiang HAN; Shoubiao ZHANG; Guoqiang LI; Xiang GAO; the EAST Team

doi:10.1088/2058-6272/ad0f0a

Plasma Science and Technology > 2024 > 26(3): 034010. > DOI: 10.1088/2058-6272/ad0f0a

Kaixuan YE, Zhen ZHOU, Tao ZHANG, Jiuyang MA, Yumin WANG, Gongshun LI, Kangning GENG, Mingfu WU, Fei WEN, Jia HUANG, Yang ZHANG, Linming SHAO, Shuqi YANG, Fubin ZHONG, Shanlu GAO, Lin YU, Ziqiang ZHOU, Haoming XIANG, Xiang HAN, Shoubiao ZHANG, Guoqiang LI, Xiang GAO, the EAST Team. Experimental study of core MHD behavior and a novel algorithm for rational surface detection based on profile reflectometry in EAST[J]. Plasma Science and Technology, 2024, 26(3): 034010. DOI: 10.1088/2058-6272/ad0f0a

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Experimental study of core MHD behavior and a novel algorithm for rational surface detection based on profile reflectometry in EAST

1.
Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
2.
University of Science and Technology of China, Hefei 230026, People’s Republic of China
3.
Hebei Key Laboratory of Compact Fusion, Langfang 065001, Peoples Republic of China
4.
ENN Science and Technology Development Co., Ltd., Langfang 065001, Peoples Republic of China
5.
Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People’s Republic of China

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Author Bio:
Tao ZHANG: zhangt@ipp.ac.cn

Xiang GAO: xgao@ipp.ac.cn
Corresponding author:
Tao ZHANG, zhangt@ipp.ac.cn

Xiang GAO, xgao@ipp.ac.cn
Received Date: July 08, 2023
Revised Date: November 19, 2023
Accepted Date: November 20, 2023
Available Online: March 12, 2024
Published Date: March 14, 2024

Graphical Abstract

Abstract

Abstract

Microwave reflectometry is a powerful diagnostic that can measure the density profile and localized turbulence with high spatial and temporal resolution and will be used in ITER, so understanding the influence of plasma perturbations on the reflect signal is important. The characteristics of the reflect signal from profile reflectometry, the time-of-flight (TOF) signal associated with the MHD instabilities, are investigated in EAST. Using a 1D full-wave simulation code by the Finite-DifferenceTime-Domain (FDTD) method, it is well validated that the local density flattening could induce the discontinuity of the simulated TOF signal and an obvious change of reflect amplitude. Experimental TOF signals under different types of MHD instabilities (sawtooth, sawtooth precursors and tearing mode) are studied in detail and show agreement with the simulation. Two new improved algorithms for detecting and localizing the radial positions of the low-order rational surface, the cross-correlation and gradient threshold (CGT) method and the 2D convolutional neural network approach (CNN) are presented for the first time. It is concluded that TOF signal analysis from profile reflectometry can provide a straightforward and localized measurement of the plasma perturbation from the edge to the core simultaneously and may be a complement or correction to the q-profile control, which will be beneficial for the advanced tokamak operation.
- MHD instabilities,
- profile reflectometry,
- rational surface detection,
- convolutional neural network (CNN),
- EAST tokamak

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Acknowledgment

The authors would like to acknowledge the help of Yuqi CHU for the q-profile. The authors would like to thank Ang TI and Yan CHAO in EAST for the helpful discussions. This work has been supported by the Open Fund of Magnetic Confinement Laboratory of Anhui Province (No. 2023AMF03005), the China Postdoctoral Science Foundation (No. 2021M703256), the Director Funding of Hefei Institutes of Physical Science, Chinese Academy of Sciences (No. YZJJ2022QN16), the National Key R&D Program of China (Nos. 2022YFE03050003, 2019YFE03080200, 2019YFE03040002, and 2022YFE03070004), National Natural Science Foundation of China (Nos. 12075284, 12175277, 12275315 and 12275311), the National Magnetic Confinement Fusion Science Program of China (No. 2022YFE03040001) and the Science Foundation of the Institute of Plasma Physics, Chinese Academy of Sciences (No. DSJJ-2021-08).

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Experimental study of core MHD behavior and a novel algorithm for rational surface detection based on profile reflectometry in EAST

Abstract