Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

Yaoyu XIE (谢耀禹); Kaijun ZHAO (赵开君); Zhipeng CHEN (陈志鹏); Jiaqi DONG (董家齐); Kimitaka ITOH; Zhongyong CHEN (陈忠勇); Yuejiang SHI (石跃江); Yonghua DING (丁永华); Jun CHENG (程钧); Longwen YAN (严龙文); Hai LIU (刘海); Zhifeng CHENG (程芝峰); Zhoujun YANG (杨州军); Nengchao WANG (王能超); Lu WANG (王璐); Jianqiang XU (许健强); Yunfeng LIANG (梁云峰); J-TEXT Team

doi:10.1088/2058-6272/ac0ccd

Plasma Science and Technology > 2021 > 23(10): 105102. > DOI: 10.1088/2058-6272/ac0ccd

Yaoyu XIE (谢耀禹), Kaijun ZHAO (赵开君), Zhipeng CHEN (陈志鹏), Jiaqi DONG (董家齐), Kimitaka ITOH, Zhongyong CHEN (陈忠勇), Yuejiang SHI (石跃江), Yonghua DING (丁永华), Jun CHENG (程钧), Longwen YAN (严龙文), Hai LIU (刘海), Zhifeng CHENG (程芝峰), Zhoujun YANG (杨州军), Nengchao WANG (王能超), Lu WANG (王璐), Jianqiang XU (许健强), Yunfeng LIANG (梁云峰), J-TEXT Team. Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak[J]. Plasma Science and Technology, 2021, 23(10): 105102. DOI: 10.1088/2058-6272/ac0ccd

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Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak

¹ School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, People's Republic of China
² International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics, State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
³ Southwestern Institute of Physics, Chengdu 610041, People's Republic of China
⁴ Institute of Science and Technology Research, Chubu University, Aichi 487-8501, Japan
⁵ Research Center for Plasma Turbulence, Kyushu University, Kasuga 816-8580, Japan
⁶ National Institute for Fusion Science, Toki 509-5292, Japan
⁷ ENN Science and Technology Development Co., Ltd, and Hebei Key Laboratory of Compact Fusion Langfang 065001, People's Republic of China
⁸ Institute of Fusion Science, School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 610031, People's Republic of China

Funds: This work is supported by National Natural Science Foundation of China (Nos. 12075057, 11775069, 11320101005, 51821005 and 11875020); Jiangxi Provincial Natural Science Foundation (No. 20202ACBL201002) and Doctoral Foundation (Nos. DHBK2017134 and DHBK 2018059); and Grant-in-Aid for Scientific Research of JSPS (Nos. 15H02155, 15H02335, 16H02442).

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Received Date: February 09, 2021
Revised Date: June 15, 2021
Accepted Date: June 17, 2021

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Abstract

Abstract

The toroidal component of the velocity for geodesic acoustic modes (GAMs) is first demonstrated. Multiple Langmuir probe arrays set up near the top tokamak of the J-TEXT were utilized for this study. A significant peak at the GAM frequency is observed in Mach number fluctuations. The toroidal velocity for the GAMs is estimated as ∼10–100 m s⁻¹ and increases with the poloidal velocity. The ratio of toroidal component to the poloidal one of the velocity is mainly located in the interval between 0.3 and 1.0. With higher safety factors q, the ratio almost does not change with decreasing the safety factor, whereas it goes up sharply at low q. The coherencies between poloidal electric fields and Mach number fluctuations in turbulence frequency bands are also evaluated, and are higher than those between radial electric fields and Mach number fluctuations.
- zonal flow,
- geodesic acoustic mode,
- tokamak,
- return flow,
- Mach number

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References

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Toroidal component of velocity for geodesic acoustic modes in the edge plasmas of the J-TEXT tokamak