Quasi-coherent mode in core plasma of SUNIST spherical tokamak

Wenbin LIU; Shouzhi WANG; Binbin WANG; Pengjuan SU; Zhengbo CHENG; Yi TAN; Zhe GAO; Yuanxi WAN; Xiang GAO; Xiaodong LIN; Jianjun HUANG; Muquan WU; Xiang ZHU; Baolong HAO; Hang LI

doi:10.1088/2058-6272/ac85a3

Plasma Science and Technology > 2023 > 25(1): 015103. > DOI: 10.1088/2058-6272/ac85a3

Wenbin LIU, Shouzhi WANG, Binbin WANG, Pengjuan SU, Zhengbo CHENG, Yi TAN, Zhe GAO, Yuanxi WAN, Xiang GAO, Xiaodong LIN, Jianjun HUANG, Muquan WU, Xiang ZHU, Baolong HAO, Hang LI. Quasi-coherent mode in core plasma of SUNIST spherical tokamak[J]. Plasma Science and Technology, 2023, 25(1): 015103. DOI: 10.1088/2058-6272/ac85a3

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Quasi-coherent mode in core plasma of SUNIST spherical tokamak

1.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, People's Republic of China
2.
Advanced Energy Research Center, Shenzhen University, Shenzhen 518060, People's Republic of China
3.
Department of Engineering Physics, Tsinghua University, Beijing 100084, People's Republic of China
4.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

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Corresponding author:
Wenbin LIU, E-mail: liuwenbin@sunist.org
Received Date: March 24, 2022
Revised Date: July 27, 2022
Accepted Date: July 28, 2022
Available Online: December 05, 2023
Published Date: November 29, 2022

Graphical Abstract

Abstract

Abstract

A quasi-coherent (QC) mode was observed in the core region of low-density ohmic plasmas in Sino-UNIted Spherical Tokamak. In experiments on the QC mode, two sets of moveable Langmuir probes (LPs) were used to measure the local parameters including floating potential, electron temperature, electron density, and so on, as well as their profiles. To monitor the magnetohydrodynamic activities, a Mirnov probe was used to measure the poloidal magnetic fluctuation. The QC mode can be seen in the spectra of floating potential, but there is no similar peak in the spectra of magnetic fluctuation. Thus, the QC mode is probably electrostatic. By analyzing the electrostatic potential fluctuations from the LPs, the features of the QC mode including frequency, wavenumber, propagation direction, and dependence on collisionality are identified, which are consistent with the characteristics of dissipative trapped electron mode.
- quasi-coherent (QC) mode,
- spherical tokamak,
- turbulence,
- dissipative trapped electron mode (DTEM)

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Acknowledgments

The authors would thank Dr. Weixing Wang from PPPL, Jianqiang Xu from SWIP, and Yong Xiao from Zhejiang University for useful help. This work is supported by National Natural Science Foundation of China (Nos. 11827810, 11875177, 12105189 and 12075155), International Atomic Energy Agency Research (No. 22733), the National Magnetic Confinement Fusion Program of China (No. 2019YFE03010001).

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Quasi-coherent mode in core plasma of SUNIST spherical tokamak

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