Comparison of natural grassy ELM behavior in favorable/unfavorable <i>B</i><sub>t</sub> in EAST

Genfan DING (丁根凡); Qingquan YANG (杨清泉); Guosheng XU (徐国盛); Xin LIN (林新); Yang YE (叶扬); Ran CHEN (陈冉); Yumin WANG (王嵎民); Qing ZANG (臧庆); Heng LAN (兰恒); Liang CHEN (陈良)

doi:10.1088/2058-6272/ac061b

Plasma Science and Technology > 2021 > 23(9): 95105-095105. > DOI: 10.1088/2058-6272/ac061b

Genfan DING (丁根凡), Qingquan YANG (杨清泉), Guosheng XU (徐国盛), Xin LIN (林新), Yang YE (叶扬), Ran CHEN (陈冉), Yumin WANG (王嵎民), Qing ZANG (臧庆), Heng LAN (兰恒), Liang CHEN (陈良). Comparison of natural grassy ELM behavior in favorable/unfavorable B_t in EAST[J]. Plasma Science and Technology, 2021, 23(9): 95105-095105. DOI: 10.1088/2058-6272/ac061b

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Comparison of natural grassy ELM behavior in favorable/unfavorable B_t in EAST

¹ Anhui University, Hefei 230601, People's Republic of China
² Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
³ University of Science and Technology of China, Hefei 230026, People's Republic of China
⁴ Institute of Energy, Hefei Comprehensive National Science Center, Hefei 230031, People's Republic of China

Funds: This work was supported by the National Magnetic Confinement Fusion Energy R&D Program of China (No. 2017YFE0301300); National Natural Science Foundation of China (Nos. 12005257 and 11905143); the Key Research Program of Frontier Sciences, the CASHIPS Director's Fund (No. YZJJ2020QN13); Special Research Assistant Funding of CAS and China Postdoctoral Science Foundation (No. 2020M671913).

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Received Date: March 28, 2021
Revised Date: May 25, 2021
Accepted Date: May 26, 2021

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Abstract

Abstract

The properties of grassy edge-localized modes (ELMs) in EAST in the favorable and unfavorable Bt are statistically studied. Statistical analysis indicates that there is no systematical difference in the frequencies of grassy ELMs under the two different magnetic configurations in the similar parameter spaces. The high-frequency grassy ELM (f_ELM > 1 kHz) in unfavorable Bt is dependent on the high poloidal beta βp and high triangularity δ_u, while the high-frequency grassy ELM (f_ELM > 1 kHz) in favorable B_t appears to rely on the high plasma density. A frequently occurring phenomenon in favorable Bt defined as 'clustered ELM' seems to be the most evident difference in ELM behavior between favorable and unfavorable Bt. Statistical analysis shows that larger plasma-wall outer gap, longer plasma elongation, lower low-hybrid wave heating power and electron cyclotron resonance heating power favor the occurrence of clustered grassy ELMs. Further studies indicate that the generation of clustered grassy ELMs could be correlated with the lower electron temperature in the bulk plasma.
- grassy ELM,
- favorable and unfavorable B_t,
- clustered ELM,
- EAST

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Comparison of natural grassy ELM behavior in favorable/unfavorable B_t in EAST