Nuclear Fusion (Jan 2023)
Validation of the plasma-wall self-organization model for density limit in ECRH-assisted start-up of Ohmic discharges on J-TEXT
- Jiaxing Liu,
- Ping Zhu,
- Dominique Franck Escande,
- Junli Zhang,
- Donghui Xia,
- Yuhan Wang,
- Jiaming Wang,
- Qinghu Yang,
- Jiangang Fang,
- Xiaoqing Zhang,
- Li Gao,
- Zhifeng Cheng,
- Zhipeng Chen,
- Zhoujun Yang,
- Zhongyong Chen,
- Yonghua Ding,
- Yuan Pan,
- the J-TEXT Team
Affiliations
- Jiaxing Liu
- 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
- Ping Zhu
- 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; Department of Engineering Physics, University of Wisconsin-Madison , Madison, WI 53706, United States of America
- Dominique Franck Escande
- ORCiD
- Aix-Marseille Université, CNRS, PIIM, UMR 7345 , Marseille, France
- 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
- 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
- Yuhan 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
- Jiaming 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
- Qinghu Yang
- 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
- Jiangang Fang
- 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
- Xiaoqing 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
- Li Gao
- 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
- 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
- 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
- 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
- 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
- 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
- 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
- the J-TEXT Team
- DOI
- https://doi.org/10.1088/1741-4326/ace91c
- Journal volume & issue
-
Vol. 63,
no. 9
p. 096009
Abstract
A recently developed plasma-wall self-organization model (Escande et al 2022 Nucl. Fusion 62 026001) predicts a significantly enhanced density limit, which may be attainable in tokamaks with ECRH-assisted Ohmic start-up and sufficiently high initial neutral density. Experiments have been conducted on J-TEXT to validate such a density limit scenario based on this model. Experimental results demonstrate that increasing the pre-filled gas pressure or ECRH power during the start-up phase can help effectively enhance plasma purity and raise the density limit at the flat-top phase. The experimental data shows that density limit increases by a ratio $0.76/0.6 \approx 1.27$ for a decrease by a factor $0.13/0.33 \approx 0.4$ in $\text{C}_\text{III}$ radiation.
Keywords
