Thermal ion kinetic effects and Landau damping in fishbone modes

The kinetic–magnetohydrodynamic (MHD) hybrid simulation approach for macroscopic instabilities in plasmas can be extended to include the kinetic effects of both thermal ions and energetic ions. The new coupling scheme includes synchronization of the density and parallel velocity between thermal ions...

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Bibliographic Details
Published in:Journal of plasma physics 2022-12, Vol.88 (6), Article 905880610
Main Authors: Liu, Chang, Jardin, Stephen C., Bao, Jian, Gorelenkov, Nikolai, Brennan, Dylan P., Yang, James, Podesta, Mario
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Coupling
Electric fields
Energetic particles
Equilibrium
Fluid flow
fusion plasma
Ions
Landau damping
Magnetic flux
Magnetohydrodynamics
Perturbation
plasma instabilities
Plasma physics
plasma simulation
Simulation
Synchronism
Velocity
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Summary:The kinetic–magnetohydrodynamic (MHD) hybrid simulation approach for macroscopic instabilities in plasmas can be extended to include the kinetic effects of both thermal ions and energetic ions. The new coupling scheme includes synchronization of the density and parallel velocity between thermal ions and MHD, in addition to pressure coupling, to ensure the quasineutrality condition and avoid numerical errors. The new approach has been implemented in the kinetic-MHD code M3D-C1-K, and was used to study the thermal ion kinetic effects and Landau damping in fishbone modes in both DIII-D and NSTX. It is found that the thermal ion kinetic effects can cause an increase of the frequencies of the non-resonant $n=1$ fishbone modes driven by energetic particles for $q_\mathrm {min}>1$, and Landau damping can provide additional stabilization effects. A nonlinear simulation for $n=1$ fishbone mode in NSTX is also performed, and the perturbation on magnetic flux surfaces and the transport of energetic particles are calculated.
ISSN:0022-3778
1469-7807
DOI:10.1017/S0022377822000952