Toroidal modelling of resistive internal kink and fishbone instabilities

doi:10.1063/1.5022208

Title: Toroidal modelling of resistive internal kink and fishbone instabilities

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Abstract

The influence of energetic particles and plasma resistivity on the n=1 ( n is the toroidal mode number) internal kink and fishbone modes in tokamak plasmas is numerically investigated, using the full toroidal, resistive magnetohydrodynamic-kinetic hybrid stability code MARS-K. The results show that energetic particles can either stabilize or destabilize the ideal internal kink mode, depending on the radial profiles of the particles' density and pressure. Resistive fishbones with and without an ideal wall are investigated. It is found that, in the presence of energetic particles as well as plasma resistivity, two branches of unstable roots exist, for a plasma which is ideally stable to the internal kink instability. One is the resistive internal kink mode. The other is the resistive fishbone mode. These two-branch solutions show similar behaviors, independent of whether the initial ideal kink stability is due to an ideal wall stabilization for high-beta plasmas, or due to a stable equilibrium below the Bussac pressure limit. For a realistic toroidal plasma, the resistive internal kink is the dominant instability, which grows much faster than the resistive fishbone. The plasma resistivity destabilizes the resistive internal kink while stabilizes the resistive fishbone. Systematic comparison with an analytic model qualitatively confirmsmore »« less

Authors:

Wu, Tingting ^[1]; He, Hongda ^[2]; Liu, Yueqiang ^[3]; Liu, Yue ^[1]; Hao, G. Z. ^[4]; Zhu, Jinxia ^[5]

Dalian Univ. of Technology, Dalian (China). School of Physics and Optoelectronic Technology, Ministry of Education, Key Lab. of Materials Modification by Laser, Ion, and Electron Beams
Southwestern Inst. of Physics, Chengdu (China)
Southwestern Inst. of Physics, Chengdu (China); General Atomics, San Diego, CA (United States)
Southwestern Inst. of Physics, Chengdu (China); Univ. of California, Irvine, CA (United States)
Sichuan Univ. of Arts and Science, Dazhou (China). School of Intelligent Manufacturing

Publication Date:: 2018-05-09

Research Org.:: General Atomics, San Diego, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC)

OSTI Identifier:: 1540169

Grant/Contract Number:: FC02-04ER54698; FG02-95ER54309

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 25; Journal Issue: 5; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: physics

Citation Formats


                    Wu, Tingting, He, Hongda, Liu, Yueqiang, Liu, Yue, Hao, G. Z., and Zhu, Jinxia. Toroidal modelling of resistive internal kink and fishbone instabilities.  United States: N. p., 2018. 
        Web.  doi:10.1063/1.5022208.

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                    Wu, Tingting, He, Hongda, Liu, Yueqiang, Liu, Yue, Hao, G. Z., & Zhu, Jinxia. Toroidal modelling of resistive internal kink and fishbone instabilities.  United States.  doi:10.1063/1.5022208.

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                    Wu, Tingting, He, Hongda, Liu, Yueqiang, Liu, Yue, Hao, G. Z., and Zhu, Jinxia. Wed .  
        "Toroidal modelling of resistive internal kink and fishbone instabilities".  United States.  doi:10.1063/1.5022208.  https://www.osti.gov/servlets/purl/1540169.

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@article{osti_1540169,

  title        = {Toroidal modelling of resistive internal kink and fishbone instabilities},

  author       = {Wu, Tingting and He, Hongda and Liu, Yueqiang and Liu, Yue and Hao, G. Z. and Zhu, Jinxia},

  abstractNote = {The influence of energetic particles and plasma resistivity on the n=1 (n is the toroidal mode number) internal kink and fishbone modes in tokamak plasmas is numerically investigated, using the full toroidal, resistive magnetohydrodynamic-kinetic hybrid stability code MARS-K. The results show that energetic particles can either stabilize or destabilize the ideal internal kink mode, depending on the radial profiles of the particles' density and pressure. Resistive fishbones with and without an ideal wall are investigated. It is found that, in the presence of energetic particles as well as plasma resistivity, two branches of unstable roots exist, for a plasma which is ideally stable to the internal kink instability. One is the resistive internal kink mode. The other is the resistive fishbone mode. These two-branch solutions show similar behaviors, independent of whether the initial ideal kink stability is due to an ideal wall stabilization for high-beta plasmas, or due to a stable equilibrium below the Bussac pressure limit. For a realistic toroidal plasma, the resistive internal kink is the dominant instability, which grows much faster than the resistive fishbone. The plasma resistivity destabilizes the resistive internal kink while stabilizes the resistive fishbone. Systematic comparison with an analytic model qualitatively confirms the MARS-K results. Finally, compared to analytic models based on the perturbative approach, MARS-K offers an improved physics model via self-consistent treatment of coupling between the fluid and kinetic effects due to energetic particles.},

  doi          = {10.1063/1.5022208},

  journal      = {Physics of Plasmas},

  number       = 5,

  volume       = 25,

  place        = {United States},

  year         = {2018},

  month        = {5}

}

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