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

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 » 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.« less

Authors:
 [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
  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
  2. 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)
  3. 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)
  4. Max Planck Inst. of Plasma Physics, Garching (Germany)
Publication Date:
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.
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.
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.
@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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