Study of MHD mode and cooling process during disruptions triggered by impurities injection in J-TEXT

doi:10.1088/1741-4326/aae39a

Title: Study of MHD mode and cooling process during disruptions triggered by impurities injection in J-TEXT

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Abstract

The injection of a large amount of impurities is one of the possible ways of mitigating disruption in large-scale tokamaks. The deposition of impurities at the center of the plasma is the key to the radiation of plasma energy and suppression of runaway. The interaction of the gas jet with the rational surfaces has been studied by scanning the plasma current. The experimental results show that the injection of a massive amount of argon can cool the plasma from the edge to the core region, and the cooling process is accompanied by different magnetohydrodynamic (MHD) modes when the gas jet reaches the corresponding rational surfaces. It is observed that with different edge safety factors and electron density, gas injection can induce different poloidal modes at first. Then, the poloidal mode traverses to lower m (where m is the poloidal mode number) MHD activities until a 2/1 mode is initiated and a thermal quench is started. The experimental results show that the penetration of a gas jet across the rational surfaces is faster in the plasmas with pre-existing large 2/1 tearing modes, which indicates that the 2/1 mode plays an important role in the penetration process. Disruptions triggered by supersonic molecularmore »« less

Authors:

Huang, Y. ^[1];

^[2]; Hu, Qiming ^[3]; Yu, Q. ^[4];

^[1]; Wei, Y. N. ^[1]; Su, Pengjuan ^[1]; Shen, Chengshuo ^[1]; Guo, Daojing ^[1]; Yang, Z. J. ^[1]; Pan, X. M. ^[1]; Huang, Mingxiang ^[1]; Cai, Qinxue ^[1]; Wang, Tong ^[1]; Lin, Z. F. ^[1]; Tong, R. H. ^[1]; Yan, W. ^[1]; Chen, Z. P. ^[1]; Ding, Y. H. ^[1]; Liang, Y. ^[1]

Huazhong Univ. of Science and Technology, Wuhan (China). International Joint Research Lab. of Magnetic Confinement Fusion and Plasma Physics. State Key Lab. of Advanced Electromagnetic Engineering and Technology. School of Electrical and Electronic Engineering
Huazhong Univ. of Science and Technology, Wuhan (China). International Joint Research Lab. of Magnetic Confinement Fusion and Plasma Physics. State Key Lab. of Advanced Electromagnetic Engineering and Technology. School of Electrical and Electronic Engineering; Chengdu Univ. (China)
Huazhong Univ. of Science and Technology, Wuhan (China). International Joint Research Lab. of Magnetic Confinement Fusion and Plasma Physics. State Key Lab. of Advanced Electromagnetic Engineering and Technology. School of Electrical and Electronic Engineering; Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Max Planck Inst. of Plasma Physics, Garching (Germany)

Publication Date:: 2018-09-24

Research Org.:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Huazhong Univ. of Science and Technology, Wuhan (China)

Sponsoring Org.:: USDOE; National Magnetic Confinement Fusion Science Program (China); National Natural Science Foundation of China (NNSFC)

Contributing Org.:: J-TEXT Team

OSTI Identifier:: 1480686

Grant/Contract Number:: 2015GB111001; 2015GB111002; 2015GB104000; 11505069; 11775089; 71762031; 11575068

Resource Type:: Accepted Manuscript

Journal Name:: Nuclear Fusion

Additional Journal Information:: Journal Volume: 58; Journal Issue: 12; Journal ID: ISSN 0029-5515

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; disruption; massive gas injection; magnetic perturbation; tokamak

Citation Formats


                    Huang, Y., Chen, Z. Y., Hu, Qiming, Yu, Q., Jiang, Z. H., Wei, Y. N., Su, Pengjuan, Shen, Chengshuo, Guo, Daojing, Yang, Z. J., Pan, X. M., Huang, Mingxiang, Cai, Qinxue, Wang, Tong, Lin, Z. F., Tong, R. H., Yan, W., Chen, Z. P., Ding, Y. H., and Liang, Y. Study of MHD mode and cooling process during disruptions triggered by impurities injection in J-TEXT.  United States: N. p., 2018. 
        Web.  doi:10.1088/1741-4326/aae39a.

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                    Huang, Y., Chen, Z. Y., Hu, Qiming, Yu, Q., Jiang, Z. H., Wei, Y. N., Su, Pengjuan, Shen, Chengshuo, Guo, Daojing, Yang, Z. J., Pan, X. M., Huang, Mingxiang, Cai, Qinxue, Wang, Tong, Lin, Z. F., Tong, R. H., Yan, W., Chen, Z. P., Ding, Y. H., & Liang, Y. Study of MHD mode and cooling process during disruptions triggered by impurities injection in J-TEXT.  United States.  doi:10.1088/1741-4326/aae39a.

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                    Huang, Y., Chen, Z. Y., Hu, Qiming, Yu, Q., Jiang, Z. H., Wei, Y. N., Su, Pengjuan, Shen, Chengshuo, Guo, Daojing, Yang, Z. J., Pan, X. M., Huang, Mingxiang, Cai, Qinxue, Wang, Tong, Lin, Z. F., Tong, R. H., Yan, W., Chen, Z. P., Ding, Y. H., and Liang, Y. Mon .  
        "Study of MHD mode and cooling process during disruptions triggered by impurities injection in J-TEXT".  United States.  doi:10.1088/1741-4326/aae39a.  https://www.osti.gov/servlets/purl/1480686.

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@article{osti_1480686,

  title        = {Study of MHD mode and cooling process during disruptions triggered by impurities injection in J-TEXT},

  author       = {Huang, Y. and Chen, Z. Y. and Hu, Qiming and Yu, Q. and Jiang, Z. H. and Wei, Y. N. and Su, Pengjuan and Shen, Chengshuo and Guo, Daojing and Yang, Z. J. and Pan, X. M. and Huang, Mingxiang and Cai, Qinxue and Wang, Tong and Lin, Z. F. and Tong, R. H. and Yan, W. and Chen, Z. P. and Ding, Y. H. and Liang, Y.},

  abstractNote = {The injection of a large amount of impurities is one of the possible ways of mitigating disruption in large-scale tokamaks. The deposition of impurities at the center of the plasma is the key to the radiation of plasma energy and suppression of runaway. The interaction of the gas jet with the rational surfaces has been studied by scanning the plasma current. The experimental results show that the injection of a massive amount of argon can cool the plasma from the edge to the core region, and the cooling process is accompanied by different magnetohydrodynamic (MHD) modes when the gas jet reaches the corresponding rational surfaces. It is observed that with different edge safety factors and electron density, gas injection can induce different poloidal modes at first. Then, the poloidal mode traverses to lower m (where m is the poloidal mode number) MHD activities until a 2/1 mode is initiated and a thermal quench is started. The experimental results show that the penetration of a gas jet across the rational surfaces is faster in the plasmas with pre-existing large 2/1 tearing modes, which indicates that the 2/1 mode plays an important role in the penetration process. Disruptions triggered by supersonic molecular beam injection display a slower cooling process compared with massive gas injection, which can be divided into four stages. The dominant poloidal mode transition from m = 3 to m = 2 is associated with electron temperature recovery.},

  doi          = {10.1088/1741-4326/aae39a},

  journal      = {Nuclear Fusion},

  number       = 12,

  volume       = 58,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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DOI: 10.1088/1741-4326/aae39a

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