Validation of the plasma-wall self-organization model for density limit in ECRH-assisted start-up of Ohmic discharges on J-TEXT

Nuclear Fushion

article

Jiaxing Liu¹  Ping Zhu¹  Dominique Franck Escande³  Junli Zhang¹  Donghui Xia¹  Yuhan Wang¹  Jiaming Wang¹  Qinghu Yang¹  Jiangang Fang¹  Xiaoqing Zhang¹  Li Gao¹  Zhifeng Cheng¹  Zhipeng Chen¹  Zhoujun Yang¹  Zhongyong Chen¹  Yonghua Ding¹  Yuan Pan¹ 

[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;Department of Engineering Physics, University of Wisconsin-Madison;Aix-Marseille Université

关键词: density limit;    radiation;    plasma wall interaction;    ECRH;    J-TEXT;   

DOI  :  10.1088/1741-4326/ace91c

来源: Institute of Physics Publishing Ltd.

【 摘 要 】

A recently developed plasma-wall self-organization model (Escandeet al2022Nucl. Fusion62026001) 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 1.27for a decrease by a factor 0.13/0.33 approx 0.4in ext{C}_ext{III}radiation.

【 授权许可】

Unknown