Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak

Chenyu WANG (王晨宇); Lin NIE (聂林); Guixin TANG (唐圭新); Min XU (许敏); Rui KE (柯锐); Yihang CHEN (陈逸航); Huajie WANG (王华杰); Zhanhui WANG (王占辉); Shilin HU (胡世林); Ting WU (吴婷); Ting LONG (龙婷); Yuxuan ZHU (朱宇轩); Hao LIU (刘灏); Shaobo GONG (龚少博); Jinbang YUAN (袁金榜); Longwen YAN (严龙文)

doi:10.1088/2058-6272/abed2c

Plasma Science and Technology > 2021 > 23(5): 55103-055103. > DOI: 10.1088/2058-6272/abed2c

Chenyu WANG (王晨宇), Lin NIE (聂林), Guixin TANG (唐圭新), Min XU (许敏), Rui KE (柯锐), Yihang CHEN (陈逸航), Huajie WANG (王华杰), Zhanhui WANG (王占辉), Shilin HU (胡世林), Ting WU (吴婷), Ting LONG (龙婷), Yuxuan ZHU (朱宇轩), Hao LIU (刘灏), Shaobo GONG (龚少博), Jinbang YUAN (袁金榜), Longwen YAN (严龙文). Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak[J]. Plasma Science and Technology, 2021, 23(5): 55103-055103. DOI: 10.1088/2058-6272/abed2c

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Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak

¹ Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
² Harbin Institute of Technology, Harbin 150001, People's Republic of China
³ University of Science and Technology of China, Hefei 230026, People's Republic of China

Funds: This research is supported by the National Key Research and Development Program of China (Nos. 2017YFE0300500, 2017YFE0300501) and No. 2018YFE0309100 and National Natural Science Foundation of China (Nos. 11705052, 11875124, 11905050, 11875020 and U1867222).

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Received Date: October 19, 2020
Revised Date: March 08, 2021
Accepted Date: March 08, 2021

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Abstract

Abstract

Several results based on the Langmuir probes' data on the HL-2A tokamak are presented. The blob structures' radial and poloidal drift velocities, estimated by the gradient of floating potential and by time delay evaluation, are compared in different line-averaged density and electron cyclotron resonance heating conditions. A positive correlation is observed in the comparison between blobs' radial velocity estimated by the two methods mentioned above, regardless of the situation differences mentioned above. Correlation is also observed in the comparison between the blobs' poloidal velocity estimated by the two methods in different situations, while a shift due to the different line-averaged density is observed. These results imply that the radial gradient of floating potential may have some value as a reference during data analysis in low-parameter discharge.
- Langmuir probe,
- blob structure,
- scrape-off layer

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Comparison between fluctuation of floating potential gradient and velocity of blob structure on HL-2A tokamak