Investigation of electron cyclotron current drive efficiency on the J-TEXT tokamak

Jiangang FANG; Wei YAN; Zhongyong CHEN; Xiaobo ZHANG; Xixuan CHEN; Junli ZHANG; Feiyue MAO; You LI; Lingke MOU; Yu ZHONG; Feng LI; Weikang ZHANG; Fanxi LIU; Guinan ZOU; Song ZHOU; Da LI; Li GAO; Donghui XIA; Zhoujun YANG; Zhipeng CHEN; Nengchao WANG; Yonghua DING; Yunfeng LIANG; Yuan PAN; the J-TEXT Team

doi:10.1088/2058-6272/aca86e

Plasma Science and Technology > 2022 > 24(12): 124016. > DOI: 10.1088/2058-6272/aca86e

Jiangang FANG, Wei YAN, Zhongyong CHEN, Xiaobo ZHANG, Xixuan CHEN, Junli ZHANG, Feiyue MAO, You LI, Lingke MOU, Yu ZHONG, Feng LI, Weikang ZHANG, Fanxi LIU, Guinan ZOU, Song ZHOU, Da LI, Li GAO, Donghui XIA, Zhoujun YANG, Zhipeng CHEN, Nengchao WANG, Yonghua DING, Yunfeng LIANG, Yuan PAN, the J-TEXT Team. Investigation of electron cyclotron current drive efficiency on the J-TEXT tokamak[J]. Plasma Science and Technology, 2022, 24(12): 124016. DOI: 10.1088/2058-6272/aca86e

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Investigation of electron cyclotron current drive efficiency on the J-TEXT tokamak

1.
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
2.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China
3.
Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung—Plasmaphysik, D-52425 Jülich, Germany

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Corresponding author:
Wei YAN, E-mail: yanwei1090@hust.edu.cn

Zhongyong CHEN, E-mail: zychen@hust.edu.cn
⁴ See Wang et al 2022 (https://doi.org/10.1088/1741-4326/ac544f) for the the J-TEXT Team.
Received Date: August 16, 2022
Revised Date: November 30, 2022
Accepted Date: December 01, 2022
Available Online: December 05, 2023
Published Date: December 22, 2022

Graphical Abstract

Abstract

Abstract

Electron cyclotron current drive (ECCD) efficiency research is of great importance for the neoclassical tearing mode (NTM) stabilization. Improving ECCD efficiency is beneficial for the NTM stabilization and the ECCD power threshold reduction. ECCD efficiency has been investigated on the J-TEXT tokamak. The electron cyclotron wave (ECW) power scan was performed to obtain the current drive efficiency. The current drive efficiency is derived to be approximately η₀=(0.06–0.16)×10¹⁹ A m^-2 W^-1 on the J-TEXT tokamak. The effect of the residual toroidal electric field has been included in the determination of the current drive efficiency, which will enhance the ECCD efficiency. At the plasma current of I_p=100 kA and electron density of n_e=1.5×10¹⁹ m^-3, the ratio of Spitzer conductivity between omhic (OH) and ECCD phases is considered and the experimental data have been corrected. The correction results show that the current drive efficiency η₁ caused by the fast electron hot conductivity decreases by approximately 79%. It can be estimated that the driven current is approximately 24 kA at 300 kW ECW power.
- electron cyclotron current drive,
- current drive efficiency,
- residual toroidal electric field

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Acknowledgments

This work is supported by the National Magnetic Confinement Fusion Energy R & D Program of China (No. 2019YFE03010004), the National Key R & D Program of China (No. 2018YFE0309100), National Natural Science Foundation of China (Nos. 11775089, 11905077, 51821005).

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