The Coupling Structure Features Between (2,1) NTM and (1,1) Internal Mode in EAST Tokamak

SHI Tonghui (石同辉); WAN Baonian (万宝年); SUN Youwen (孙有文); SHEN Biao (沈飚); QIAN Jinping (钱金平); HU Liqun (胡立群); CHEN Kaiyun (陈开云); LIU Yong (刘永)

doi:10.1088/1009-0630/17/5/02

Plasma Science and Technology > 2015 > 17(5): 358-365. > DOI: 10.1088/1009-0630/17/5/02

SHI Tonghui (石同辉), WAN Baonian (万宝年), SUN Youwen (孙有文), SHEN Biao (沈飚), QIAN Jinping (钱金平), HU Liqun (胡立群), CHEN Kaiyun (陈开云), LIU Yong (刘永). The Coupling Structure Features Between (2,1) NTM and (1,1) Internal Mode in EAST Tokamak[J]. Plasma Science and Technology, 2015, 17(5): 358-365. DOI: 10.1088/1009-0630/17/5/02

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The Coupling Structure Features Between (2,1) NTM and (1,1) Internal Mode in EAST Tokamak

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China

Funds: supported by the National Magnetic Confinement Fusion Science Program of China (Nos. 2014GB103000, 2011GB101000 and 2013GB102000) and sponsored in part by National Natural Science Foundation of China (Nos. 10725523, 10990212 and 11205199)

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Received Date: August 18, 2014

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Abstract

Abstract

In the discharge of EAST tokamak, it is observed that (2,1) neoclassical tearing mode (NTM) is triggered by mode coupling with a (1,1) internal mode. Using singular value decomposition (SVD) method for soft X-ray emission and for electron cyclotron emission (ECE), the coupling spatial structures and coupling process between these two modes are analyzed in detail. The results of SVD for ECE reveal that the phase difference between these two modes equals to zero. This is consistent with the perfect coupling condition. Finally, performing statistical analysis of r_1/1, ξ_1/1 and w 2/1, we find that r_1/1 more accurately represents the coupling strength than ξ_1/1, and r_1/1 is also strongly related to the (2,1) NTM triggering, where r 1/1 is the width of (1,1) internal mode, ξ_1/1 is the perturbed amplitude of (1,1) internal mode, and w 2/1 denotes the magnetic island width of (2,1) NTM.
- EAST NTM,
- mode coupling,
- SVD,
- soft X-ray,
- ECE

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[1]	Cunkai LI, Yunfeng LIANG, Zhonghe JIANG, Song ZHOU, Jiankun HUA, Jie YANG, Qinghu YANG, Alexander KNIEPS, Philipp DREWS, Xin XU, Feiyue MAO, Wei XIE, Yutong YANG, Jinlong GUO, Yangbo LI, Zhengkang REN, Zhipeng CHEN, Nengchao WANG, the J-TEXT Team. Characteristics of the SOL ion-to-electron temperature ratio on the J-TEXT tokamak with different plasma configurations[J]. Plasma Science and Technology, 2024, 26(2): 025101. DOI: 10.1088/2058-6272/ad0c1e
[2]	Zichao LIN, Hongming ZHANG, Fudi WANG, Cheonho BAE, Jia FU, Yifei JIN, Di'an LU, Shengyu FU, Jiankang LI, Bo LYU. Inversion techniques to obtain local rotation velocity and ion temperature profiles for the x-ray crystal spectrometer on EAST[J]. Plasma Science and Technology, 2023, 25(9): 095102. DOI: 10.1088/2058-6272/acc503
[3]	Baoyue CHAI (柴宝玥), Yingying LI (李颖颖), Ze CHEN (陈泽), Wei TAO (陶巍), Yixuan ZHOU (周艺轩), Shifeng MAO (毛世峰), Zhengping LUO (罗正平), Yi YU (余羿), Bo LYU (吕波), Minyou YE (叶民友). Fast estimation of ion temperature from EAST charge exchange recombination spectroscopy using neural network[J]. Plasma Science and Technology, 2019, 21(10): 105103. DOI: 10.1088/2058-6272/ab2674
[4]	Juan YANG (杨涓), Yuliang FU (付瑜亮), Xianchuang LIU (刘宪闯), Haibo MENG (孟海波), Yizhou JIN (金逸舟). Bended probe diagnostics of the plasma characteristics within an ECR ion source with a rectangular waveguide[J]. Plasma Science and Technology, 2018, 20(8): 85402-085402. DOI: 10.1088/2058-6272/aabb9f
[5]	MA Zhibin (马志斌), WU Jun (吴俊), TAN Bisong (谭必松), SHEN Wulin (沈武林), PAN Xin (潘鑫), WANG Jianhua (汪建华). Influence of Working Pressure on Ion Sensitive Probe Measurement in Microwave ECR Plasmas[J]. Plasma Science and Technology, 2015, 17(4): 294-297. DOI: 10.1088/1009-0630/17/4/06
[6]	Tae-Seong KIM, Seung Ho JEONG, Doo Hee CHANG, Kwang Won LEE, Sang-Ryul IN. Performance of a New Ion Source for KSTAR Tokamak Plasma Heating[J]. Plasma Science and Technology, 2014, 16(6): 620-624. DOI: 10.1088/1009-0630/16/6/15
[7]	ZHANG Liping(张丽萍), SU Junyan(苏俊燕), LI Yanlong(李延龙). Propagation of Nonlinear Solitary Waves in Nonuniform Dusty Plasmas with Two-Ion Temperature[J]. Plasma Science and Technology, 2014, 16(3): 177-181. DOI: 10.1088/1009-0630/16/3/01
[8]	XIA Zhiwei (夏志伟), LI Wei (李伟), YANG Qingwei (杨青巍), LU Jie (卢杰), YI Ping (易萍), GAO Jinming (高金明). Application of DEGAS for Ion Temperature Profile Reconstruction from a NPA Diagnostic on HL-2A[J]. Plasma Science and Technology, 2013, 15(2): 101-105. DOI: 10.1088/1009-0630/15/2/04
[9]	LI Yingying, FU Jia, SHI Yuejiang, WANG Fudi, ZHANG Wei, TI Ang, XU Ping, HUANG Yiyu. Investigation of Ion Temperature Characteristics in the HT-7 Tokamak[J]. Plasma Science and Technology, 2011, 13(5): 535-540.
[10]	TAN Bisong, MA Zhibin, SHEN Wulin, WU Zhenhui, CAO Hong, WANG Jianhua. Measurement of Ion Parameters by Ion Sensitive Probe in ECR Plasma[J]. Plasma Science and Technology, 2011, 13(1): 68-72.