Combined Langmuir-magnetic probe measurements of type-I ELMy filaments in the EAST tokamak

Qingquan YANG (杨清泉); Fangchuan ZHONG (钟方川); Guosheng XU (徐国盛); Ning YAN (颜宁); Liang CHEN (陈良); Xiang LIU (刘祥); Yong LIU (刘永); Liang WANG (王亮); Zhendong YANG (仰振东); Yifeng WANG (王一丰); Yang YE (叶扬); Heng ZHANG (张恒); Xiaoliang LI (李小良)

doi:10.1088/2058-6272/aaab43

Plasma Science and Technology > 2018 > 20(6): 65101-065101. > DOI: 10.1088/2058-6272/aaab43

Qingquan YANG (杨清泉), Fangchuan ZHONG (钟方川), Guosheng XU (徐国盛), Ning YAN (颜宁), Liang CHEN (陈良), Xiang LIU (刘祥), Yong LIU (刘永), Liang WANG (王亮), Zhendong YANG (仰振东), Yifeng WANG (王一丰), Yang YE (叶扬), Heng ZHANG (张恒), Xiaoliang LI (李小良). Combined Langmuir-magnetic probe measurements of type-I ELMy filaments in the EAST tokamak[J]. Plasma Science and Technology, 2018, 20(6): 65101-065101. DOI: 10.1088/2058-6272/aaab43

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Combined Langmuir-magnetic probe measurements of type-I ELMy filaments in the EAST tokamak

¹ Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
² University of Science and Technology of China, Hefei 230036, People’s Republic of China
³ College of Science, Donghua University, Shanghai 201620, People’s Republic of China
⁴ College of Electrical Engineering, Tongling University, Tongling 244000, People’s Republic of China

Funds: This work was supported by National Natural Science Foundation of China under Contracts Nos. 11275047, 11705128, 11422546, 11575235, 11575236 and 11505222, Key Research Program of Frontier Sciences, CAS, Grant No. QYZDB-SSWSLH001 and National Magnetic Confinement Fusion Science Program of China under Contract Nos. 2015GB101000 and 2013GB107003.

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Received Date: November 26, 2017

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Abstract

Abstract

Detailed investigations on the filamentary structures associated with the type-I edge-localized modes (ELMs) should be helpful for protecting the materials of a plasma-facing wall on a future large device. Related experiments have been carefully conducted in the Experimental Advanced Superconducting Tokamak (EAST) using combined Langmuir-magnetic probes. The experimental results indicate that the radially outward velocity of type-I ELMy filaments can be up to 1.7 km s^-1 in the far scrape-off layer (SOL) region. It is remarkable that the electron temperature of these filaments is detected to be ～50 eV, corresponding to a fraction of 1/6 to the temperature near the pedestal top, while the density (~3 ×10 ¹⁹ m^-3) of these filaments could be approximate to the line-averaged density. In addition, associated magnetic fluctuations have been clearly observed at the same time, which show good agreement with the density perturbations. A localized current on the order of ～100 kA could be estimated within the filaments.
- type-I ELMy filaments,
- Langmuir-magnetic probe,
- EAST tokamak

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Combined Langmuir-magnetic probe measurements of type-I ELMy filaments in the EAST tokamak