Electron cyclotron heating assisted start-up experiments in J-TEXT

被引:0
作者
Zhang, Junli [1 ]
de Vries, Peter C. [2 ]
Nagasaki, Kazunobu [3 ]
Xia, Donghui [1 ]
Jiang, Wei [4 ]
Yang, Zhoujun [1 ]
Cheng, Zhifeng [1 ]
Xu, Xin [1 ]
Wang, Zhijiang [1 ]
Wang, Nengchao [1 ]
Gao, Li [1 ]
Ding, Yonghua [1 ]
Chen, Zhipeng [1 ]
Chen, Zhongyong [1 ]
Pan, Yuan [1 ]
机构
[1] Huazhong Univ Sci & Technol, Int Joint Res Lab Magnet Confinement Fus & Plasma, Wuhan 430074, Peoples R China
[2] ITER Org, Route Vinon Verdon,CS 90 046, F-13067 St Paul Les Durance, France
[3] Kyoto Univ, Inst Adv Energy, Uji, Japan
[4] Huazhong Univ Sci & Technol, Sch Phys, Wuhan, Peoples R China
来源
21ST JOINT WORKSHOP ON ELECTRON CYCLOTRON EMISSION AND ELECTRON CYCLOTRON RESONANCE HEATING, EC21 | 2023年 / 277卷
基金
中国国家自然科学基金;
关键词
D O I
10.1051/epjconf/202327702002
中图分类号
TL [原子能技术]; O571 [原子核物理学];
学科分类号
0827 ; 082701 ;
摘要
Electron cyclotron heating (ECH) breakdown and burn-through assist has been adopted to make the ITER start-up, which uses a low toroidal electric field of about 0.3 V/m, more robust. Related studies have been carried out on many fusion machines such as DIII-D, JT-60U, Tore Supra and FTU. However, the required ECH power to ensure an effective breakdown assist at ITER is not yet clear. Experiment was also performed in J-TEXT to determine the minimum ECH power requirements to assist breakdown and develop a better physics description of the process. The breakdown loop voltage for a successful shot was reduced from 34 to 3.7 V (corresponding to 0.56 V/m) by 300 kW X2-mode ECH power. The critical ECH power to assist the successful formation of a tokamak discharge is about 200kW, and below this value, ionization caused by ECH power is observed, however, the tokamak discharge start-up does not succeed. The effect of different loop voltages and ECH pulse-width on start-up was also studied. As injecting ECH power at a proper time, low ECH power can achieve a similar pre-ionization result as the case with high power. Extremely low breakdown voltage leads to a higher toroidal field later when putting a capacity to continue discharging in J-TEXT. The earlier shutdown of ECH power caused a failed discharge.
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页数:6
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