Interpretive JOREK simulation of thermal quench triggered by massive gas injection in EAST disruptions

Abstract JOREK 3D non-linear magnetohydrodynamic simulations with non-equilibrium impurity treatment of thermal quench (TQ) triggered by a massive neon gas in EAST L-mode disruptions are first presented. Neon impurities are deposited at Ψ N ∼ 0.7, followed by asymmetrical parallel extension along magnetic lines driven by a parallel self-consistent electrical field induced by plasma cooling process. Both double-stage and single-stage TQ observed in EAST experiments are reproduced through simulations with varying impurity particle fluxes. In double-stage TQ, non-linear interactions among the m / n = 3/1, 4/1, and 5/1 modes primarily contribute to edge stochastic. Growth of m / n = 2/1 mode initiates core energy loss during the first temperature collapse. Subsequently, the m / n = 2/1 mode of comparable large amplitude, along with higher harmonics, couples with the 3/1 mode, resulting in a global stochastic and total energy loss in the second collapse. The transition between double-stage and single-stage TQ is primarily determined by the n = 1 mode growth rate. In our simulations, the longer duration of double-stage TQ offers benefits for reducing the peak power of outward energy flux. Additionally, deeper impurity injection enhances radiative power and reduces outward energy flow. Strike point splitting on the upper-outer target, observed experimentally, is also reproduced in the simulations.

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Publication Details

Journal
Nuclear Fusion
Published
2025-04-09
DOI
https://doi.org/10.1088/1741-4326/adcacf
Primary Topic
Magnetic confinement fusion research
Type
article
Field-Weighted Citation Impact
0.00

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article

Interpretive JOREK simulation of thermal quench triggered by massive gas injection in EAST disruptions

Yao Huang, Liqing Xu, Tonghui Shi, Xiang Gao et al.
Nuclear Fusion
Magnetic confinement fusion research
article

Interpretive JOREK simulation of thermal quench triggered by massive gas injection in EAST disruptions

Yao Huang, Liqing Xu, Tonghui Shi, Xiang Gao, Ang Ti, Xiang Zhu, Di Hu, Long Zeng, Shengbo Zhao, H.D. Zhuang, Hao Xu, Dalong Chen, Kangning Geng, Guoqiang Li, Tao Zhang, Yanmin Duan, Wei Xia, Tian Tang, Songtao Mao, Qing Zang, Haiqing Liu, Liang Wang, Jinju Yang
article en

Abstract

Abstract JOREK 3D non-linear magnetohydrodynamic simulations with non-equilibrium impurity treatment of thermal quench (TQ) triggered by a massive neon gas in EAST L-mode disruptions are first presented. Neon impurities are deposited at Ψ N ∼ 0.7, followed by asymmetrical parallel extension along magnetic lines driven by a parallel self-consistent electrical field induced by plasma cooling process. Both double-stage and single-stage TQ observed in EAST experiments are reproduced through simulations with varying impurity particle fluxes. In double-stage TQ, non-linear interactions among the m / n = 3/1, 4/1, and 5/1 modes primarily contribute to edge stochastic. Growth of m / n = 2/1 mode initiates core energy loss during the first temperature collapse. Subsequently, the m / n = 2/1 mode of comparable large amplitude, along with higher harmonics, couples with the 3/1 mode, resulting in a global stochastic and total energy loss in the second collapse. The transition between double-stage and single-stage TQ is primarily determined by the n = 1 mode growth rate. In our simulations, the longer duration of double-stage TQ offers benefits for reducing the peak power of outward energy flux. Additionally, deeper impurity injection enhances radiative power and reduces outward energy flow. Strike point splitting on the upper-outer target, observed experimentally, is also reproduced in the simulations.

Nuclear FusionVol. 65(5)
University of Science and Technology of China (CN), Shenzhen University (CN), Chinese Academy of Sciences (CN), Hefei Institutes of Physical Science (CN), Institute of Plasma Physics (CN), Beihang University (CN), Tsinghua University (CN)
National Natural Science Foundation of China, National Key Research and Development Program of China
Openalex Percentile: Top 96%
Magnetic confinement fusion research
DOIOpen Access PDFOpenAlex
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