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]	S PUROHIT, Y SUZUKI, S OHDACHI, S YAMAMOTO. Soft x-ray tomographic reconstruction of Heliotron J plasma for the study of magnetohydrodynamic equilibrium and stability[J]. Plasma Science and Technology, 2019, 21(6): 65102-065102. DOI: 10.1088/2058-6272/ab0846
[2]	Xinshuai YANG (杨新帅), Ruiji HU (胡睿佶), Jun CHEN (陈俊), Fudi WANG (王福地), Jia FU (符佳), Yingying LI (李颖颖), Hongming ZHANG (张洪明), Yongcai SHEN (沈永才), Xianghui YIN (尹相辉), Bo LYU (吕波), EAST team. Measurement of impurity lines with two- crystal x-ray spectrometers on EAST[J]. Plasma Science and Technology, 2018, 20(12): 124001. DOI: 10.1088/2058-6272/aad177
[3]	Heng LAN (兰恒), Guosheng XU (徐国盛), Kevin TRITZ, Ning YAN (颜宁), Tonghui SHI (石同辉), Yongliang LI (李永亮), Tengfei WANG (王腾飞), Liang WANG (王亮), Jingbo CHEN (陈竞博), Yanmin DUAN (段艳敏), Yi YUAN (原毅), Youwen SUN (孙有文), Shuai GU (顾帅), Qing ZANG (臧庆), Ran CHEN (陈冉), Liang CHEN (陈良), Xingwei ZHENG (郑星炜), Shuliang CHEN (陈树亮), HuanLIU (刘欢), YangYE (叶扬), Huiqian WANG (汪惠乾), Baonian WAN (万宝年), the EAST Team. Analysis of electron temperature, impurity transport and MHD activity with multi-energy soft x-ray diagnostic in EAST tokamak[J]. Plasma Science and Technology, 2017, 19(12): 125101. DOI: 10.1088/2058-6272/aa8cbf
[4]	R MILLS, J LOTOSKI, Y LU. Mechanism of soft x-ray continuum radiation from low-energy pinch discharges of hydrogen and ultra-low field ignition of solid fuels[J]. Plasma Science and Technology, 2017, 19(9): 95001-095001. DOI: 10.1088/2058-6272/aa7383
[5]	M. T. RAHMAN, M. N. A. DEWAN. Analytical Determination of Collisionless Sheath Properties for Triple Frequency Capacitively Coupled Plasma[J]. Plasma Science and Technology, 2015, 17(2): 141-146. DOI: 10.1088/1009-0630/17/2/08
[6]	XU Ming (徐明), WEN Yizhi (闻一之), XIE Jinlin (谢锦林), YU Changxuan (俞昌旋), et al.. Internal Magnetic Configuration Measured by ECE Imaging on EAST Tokamak[J]. Plasma Science and Technology, 2013, 15(12): 1194-1196. DOI: 10.1088/1009-0630/15/12/05
[7]	ZHANG Xiaoding (张小丁), ZHANG Jiyan (张继彦), YANG Guohong (杨国洪), et al.. A High-Efficiency X-Ray Crystal Spectrometer for X-Ray Thomson Scattering[J]. Plasma Science and Technology, 2013, 15(8): 755-759. DOI: 10.1088/1009-0630/15/8/07
[8]	HAN Xiang (韩翔), LING Bili (凌必利), GAO Xiang (高翔), LIU Yong (刘永), TI Ang (提昂), LI Erzhong (李二众), XU Liqing (徐立清), WANG Yumin (王嵎民). Measurement of Magnetic Island Width by Multi-Channel ECE Radiometer on HT-7 Tokamak[J]. Plasma Science and Technology, 2013, 15(3): 217-220. DOI: 10.1088/1009-0630/15/3/05
[9]	LU Bo (吕波), SHI Yuejiang (石跃江), WANG Fudi (王福地), WAN Baonian (万宝年), Manfred BITTER, Kenneth W. HILL, Sang-gon LEE, LI Yingying (李颖颖), FU Jia (符佳), ZHANG Jizong (张继宗), XU Jingcui (徐经翠), SHEN Yongcai. Test of a High Throughput Detector on the X-ray Crystal Spectrometer of the EAST[J]. Plasma Science and Technology, 2013, 15(2): 97-100. DOI: 10.1088/1009-0630/15/2/03
[10]	SHANG Wanli, ZHAO Yang, XIONG Gang, YANG Jiamin, ZHU Tuo. Space-Resolved Spectrum Diagnose by Soft X-Ray Transmission Grating Spectrometer[J]. Plasma Science and Technology, 2011, 13(1): 36-39.