Experimental study of double tearing mode on EAST tokamak

Mingfu WU (吴茗甫); Zixi LIU (刘子奚); Tao ZHANG (张涛); Fubin ZHONG (钟富彬); Gongshun LI (李恭顺); HaomingXIANG(向皓明); Kangning GENG (耿康宁); Kaixuan YE (叶凯萱); Jia HUANG (黄佳); Fei WEN (文斐); Yumin WANG (王嵎民); Xiang HAN (韩翔); Shoubiao ZHANG (张寿彪); Haiqing LIU (刘海庆); Guoqiang LI (李国强); Ge ZHUANG (庄革); Xiang GAO (高翔)

doi:10.1088/2058-6272/ab4f8a

Plasma Science and Technology > 2020 > 22(2): 25102-025102. > DOI: 10.1088/2058-6272/ab4f8a

Mingfu WU (吴茗甫), Zixi LIU (刘子奚), Tao ZHANG (张涛), Fubin ZHONG (钟富彬), Gongshun LI (李恭顺), HaomingXIANG(向皓明), Kangning GENG (耿康宁), Kaixuan YE (叶凯萱), Jia HUANG (黄佳), Fei WEN (文斐), Yumin WANG (王嵎民), Xiang HAN (韩翔), Shoubiao ZHANG (张寿彪), Haiqing LIU (刘海庆), Guoqiang LI (李国强), Ge ZHUANG (庄革), Xiang GAO (高翔). Experimental study of double tearing mode on EAST tokamak[J]. Plasma Science and Technology, 2020, 22(2): 25102-025102. DOI: 10.1088/2058-6272/ab4f8a

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Experimental study of double tearing mode on EAST tokamak

¹ University of Science and Technology of China, Hefei 230026, People's Republic of China
² Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
³ Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People's Republic of China
⁴ Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China

Funds: This work was supported by the National Key R&D Program of China (Nos. 2015GB110001, 2017 YFE0300501 and 2017YFE0301205) and National Natural Science Foundation of China (Nos. 11505221, 11675211, 11805136, 11875289, 11975230).

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Received Date: July 01, 2019
Revised Date: October 18, 2019
Accepted Date: October 20, 2019

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Abstract

Abstract

The double tearing mode (DTM) in a high β_N (β_N>1.5) discharge with internal transport barrier on EAST was investigated. A 15 kHz tearing mode (TM) (m ≥ 3, n = 3) appears at outer q = 2 surface at first, which is stable in the high β_N phase. Then a 2 kHz TM (m = 2, n = 1) occurs at inner q = 2 surface. Soon after, high β_Ncollapsed with the crash of ELM, and DTM formed during the collapse of β_N. The positions of the two islands of the DTM are consistent with the q = 2 surface. The temperature fluctuations are the strongest between the two magnetic islands. A statistical analysis of high βN discharges operating with the reversed magnetic shear configuration in the EAST 2015–2018 campaign revealed the existence of the DTM in many discharges. During the DTM phase, all β_N are reduced by 10%–30% within 0.1 s. However, there are two different β_N behaviors thereafter—with and without β_N recovery. Studying the physical mechanism of β_N recovery during the DTM phase will benefit steady-state operation with reversed shear configurations in the future.
- high β_N,
- β_N collapse,
- EAST,
- double tearing mode

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