First observation of unlocking the locked mode by electrode biasing on J-TEXT tokamak

被引：4

作者：

Chen, Zhipeng ^{[1
]}

Wang, Tong ^{[1
]}

Yu, Qingquan ^{[2
]}

Hu, Qiming ^{[3
]}

Li, Da ^{[1
]}

Yang, Jie ^{[1
]}

Han, Dongliang ^{[1
]}

Shen, Chengshuo ^{[1
]}

Xia, Minghui ^{[1
]}

Liu, Hai ^{[4
]}

Wang, Nengchao ^{[1
]}

Huang, Zhuo ^{[1
]}

Yang, Zhoujun ^{[1
]}

Cheng, Zhifeng ^{[1
]}

Gao, Li ^{[1
]}

Ding, Yonghua ^{[1
]}

Shi, Peng ^{[1
]}

Chen, Zhongyong ^{[1
]}

Zhuang, Ge ^{[5
]}

Liang, Yunfeng ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Elect & Elect Engn, State Key Lab Adv Electromagnet Engn & Technol, Int Joint Res Lab Magnet Confinement Fus & Plasma, Wuhan 430074, Peoples R China

[2] Max Planck Inst Plasma Phys, D-85748 Garching, Germany

[3] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA

[4] Southwest Jiaotong Univ, Inst Fus Sci, Chengdu 610031, Peoples R China

[5] Univ Sci & Technol China, Sch Phys Sci, Dept Engn & Appl Phys, Hefei 230026, Anhui, Peoples R China

来源：

NUCLEAR FUSION | 2021年 / 61卷 / 02期

基金：

国家重点研发计划; 中国国家自然科学基金;

关键词：

tearing mode; locked mode unlocking; electrode biasing; disruption avoidance;

D O I：

10.1088/1741-4326/abc1f6

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

Major disruptions, often caused by locked m/n = 2/1 modes (m/n is the poloidal/toroidal mode number), are great threat to a tokamak fusion reactor and should be mitigated or avoided. The locked 2/1 modes have been unlocked by electrode biasing (EB) for the first time in J-TEXT tokamak experiments. The application of a sufficiently negative EB voltage in plasma edge region quickly changes the phase and amplitude of the locked 2/1 mode and drives the mode to rotate in about 10-30 ms. For a larger EB current or a smaller locked mode amplitude, the mode is more easily to be unlocked, revealing a new method for mode unlocking and avoiding plasma disruptions.

引用

页数：6

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