Experimental investigation of scrape-off layer blob high density transition in L-mode plasmas on EAST

Ping WANG; Guanghai HU; Ning YAN; Guosheng XU; Lingyi MENG; Zhikang LU; Lin YU; Manni JIA; Yifeng WANG; Liang CHEN; Heng LAN; Xiang LIU; Mingfu WU; Liang WANG

doi:10.1088/2058-6272/ac5f82

Plasma Science and Technology > 2022 > 24(7): 075103. > DOI: 10.1088/2058-6272/ac5f82

Ping WANG, Guanghai HU, Ning YAN, Guosheng XU, Lingyi MENG, Zhikang LU, Lin YU, Manni JIA, Yifeng WANG, Liang CHEN, Heng LAN, Xiang LIU, Mingfu WU, Liang WANG. Experimental investigation of scrape-off layer blob high density transition in L-mode plasmas on EAST[J]. Plasma Science and Technology, 2022, 24(7): 075103. DOI: 10.1088/2058-6272/ac5f82

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Experimental investigation of scrape-off layer blob high density transition in L-mode plasmas on EAST

1.
Institute of Plasma Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
2.
University of Science and Technology of China, Hefei 230026, People's Republic of China
3.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
4.
Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People's Republic of China
5.
Institute of Energy, Hefei Comprehensive National Science Centre, Hefei 230031, People's Republic of China

More Information

Corresponding author:
Guanghai HU, E-mail: ghhu@ipp.ac.cn

Liang WANG, E-mail: lwang@ipp.ac.cn
Received Date: November 23, 2021
Revised Date: March 16, 2022
Accepted Date: March 20, 2022
Available Online: December 13, 2023
Published Date: June 20, 2022

Graphical Abstract

Abstract

Abstract

Lithium Beam Emission Spectroscopy systems in the outer midplane and divertor Langmuir probe arrays embedded in the divertor target plates, are utilized to investigate the scrape-off layer (SOL) blob transition and its relation with divertor detachment on EAST. The blob transition in the near SOL is observed during the density ramp-up phase. When the plasma density, normalized to the Greenwald density limit, exceeds a threshold of f_GW~0.5, the blob size and lifetime increases by 2 – 3 times, while the blob detection rate decreases by about 2 times. In addition, a weak density shoulder is observed in the near SOL region at the same density threshold. Further analysis indicates that the divertor detachment is highly correlated with the blob transition, and the density threshold of blob transition is consistent with that of the access to the outer divertor detachment. The potential physical mechanisms are discussed. These results could be useful for the understanding of plasma-wall interaction issues in future devices that will operate under a detached divertor and high density conditions (over the blob transition threshold).
- blobs,
- divertor detachment,
- L-mode,
- EAST

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Acknowledgments

The authors would like to acknowledge the support and contributions of the EAST team. The work is supported by the National Key R&D Program of China (Nos. 2017YFE0301300, 2017YFA0402500, 2019YFE03030000), Institute of Energy, Hefei Comprehensive National Science Center (Nos. GXXT2020004, 12105187), National Natural Science Foundation of China (Nos. 11922513, U19A20113, 11905255, 12005004), Anhui Provincial Natural Science Foundation (No. 2008085QA38), and China Postdoctoral Science Foundation (No. 2021M702245).

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Experimental investigation of scrape-off layer blob high density transition in L-mode plasmas on EAST

Abstract