Experimental and numerical modeling of plasma start-up assisted by electron drift injection on J-TEXT

Junli Zhang; Zhifeng Cheng; Yanli Peng; Zhoujun Yang; Kazunobu Nagasaki; Nengchao Wang; Hao Cai; Yonghua Ding; Zhipeng Chen; Zhongyong Chen; Wei Jiang; Donghui Xia; Zhijiang Wang; Yuan Pan; J-TEXT team

doi:10.1088/1741-4326/acc345

Nuclear Fusion (Jan 2023)

Experimental and numerical modeling of plasma start-up assisted by electron drift injection on J-TEXT

Junli Zhang,
Zhifeng Cheng,
Yanli Peng,
Zhoujun Yang,
Kazunobu Nagasaki,
Nengchao Wang,
Hao Cai,
Yonghua Ding,
Zhipeng Chen,
Zhongyong Chen,
Wei Jiang,
Donghui Xia,
Zhijiang Wang,
Yuan Pan,
J-TEXT team

Affiliations

Junli Zhang: 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, China
Zhifeng Cheng: ORCiD; 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, China
Yanli Peng: ORCiD; School of Science, East China University of Technology , Jiangxi 330013, China
Zhoujun Yang: ORCiD; 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, China
Kazunobu Nagasaki: ORCiD; Institute of Advanced Energy, Kyoto University , Uji, Japan
Nengchao Wang: ORCiD; 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, China
Hao Cai: 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, China
Yonghua Ding: 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, China
Zhipeng Chen: ORCiD; 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, China
Zhongyong Chen: ORCiD; 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, China
Wei Jiang: ORCiD; School of Physics, Huazhong University of Science and Technology , Wuhan 430074, China
Donghui Xia: 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, China
Zhijiang Wang: 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, China
Yuan Pan: 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, China
J-TEXT team: 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, China

DOI: https://doi.org/10.1088/1741-4326/acc345
Journal volume & issue: Vol. 63, no. 6
p. 066012

Abstract

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Start-up is one of the critical phases for tokamak discharge. The electron drift injection (EDI) system has been developed on J-TEXT for start-up studies. A breakdown experiment with EDI-assisted start-up has been conducted, which verified the effect of pre-ionization by EDI to achieve start-up at a lower ohmic field voltage. A zero-dimensional (0D) model has been developed to explain the effect of EDI quantitatively. The comparison between the experiment and simulation verified the credibility of this model. Based on this model, a comparison between pure ohmic heating start-up and EDI-assisted start-up was presented, showing that EDI improved ionization, causing a lower delay to the peak of hydrogen ionization and radiation losses and a smoother rise in the electron and ion energy. This result quantitatively verified the pre-ionization effect of EDI on start-up . The effects of injecting different currents and electron energy were investigated. A better pre-ionization effect was realized by increasing the injected current, which can be a reference for the upgrading of the EDI system.

Published in Nuclear Fusion

ISSN: 0029-5515 (Print); 1741-4326 (Online)
Publisher: IOP Publishing
Country of publisher: United Kingdom
LCC subjects: Science: Physics: Nuclear and particle physics. Atomic energy. Radioactivity
Website: https://iopscience.iop.org/journal/0029-5515

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