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

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

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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 instabilitiesprofile reflectometryrational surface detectionconvolutional neural network(CNN)EAST tokamak

叶凯萱、周振、张涛、马九阳、王嵎民、李恭顺、耿康宁、吴茗甫、文斐、黄佳、张洋、邵林明、杨书琪、钟富彬、高善露、喻琳、周子强、向皓明、韩翔、张寿彪、李国强、高翔、the EAST Team

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Institute of Plasma Physics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,People's Republic of China

University of Science and Technology of China,Hefei 230026,People's Republic of China

Hebei Key Laboratory of Compact Fusion,Langfang 065001,Peoples Republic of China

ENN Science and Technology Development Co.,Ltd.,Langfang 065001,Peoples Republic of China

Advanced Energy Research Center,Shenzhen University,Shenzhen 518060,People's Republic of China

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Open Fund of Magnetic Confinement Laboratory of Anhui Province中国博士后科学基金Director Funding of Hefei Institutes of Physical Science,Chinese Academy of Sciences国家重点研发计划国家重点研发计划国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金National Magnetic Confinement Fusion Science Program of ChinaScience Foundation of the Institute of Plasma Physics,Chinese Academy of Sciences

2023 AMF030052021M703256YZJJ2022QN162022YFE030500032019YFE030802002019Y FE030400022022YFE03070004120752841217527712275315122753112022YFE03040001DSJJ-2021-08

2024

10.1088/2058-6272/ad0f0a

等离子体科学和技术(英文版)
中国科学院合肥物质科学研究所 中国力学学会

等离子体科学和技术(英文版)

EI
影响因子：0.297
ISSN：1009-0630
年,卷(期)：2024.26(3)
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