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Comprehensive simulations of bursting and non-bursting shear Alfvén waves in ICRF heated tokamak plasmas
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Comprehensive simulations of bursting and non-bursting shear Alfvén waves in ICRF heated tokamak plasmas
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Comprehensive simulations of bursting and non-bursting shear Alfvén waves in ICRF heated tokamak plasmas
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Journal Article
Comprehensive simulations of bursting and non-bursting shear Alfvén waves in ICRF heated tokamak plasmas
2026
Overview
This work reports the first comprehensive simulations of ICRH-driven tokamak plasmas on the slowing-down timescale using the kinetic-MHD hybrid code MEGA, where shear Alfv'en wave induced minority ion transport is self-consistently included during the high-energy tail formation. Bursting toroidal Alfv´en eigenmodes (TAEs) are observed in both multi-n and single-n simulations of plasmas with a relatively low magnetic field (B 0 = 1.5 T) and an ICRF resonance layer located at the magnetic axis or on the inboard side, while outboard heating always leads to non-bursting TAEs, where n is the toroidal mode number. During bursting events, a series of discrete TAEs with distinct frequencies emerges for each toroidal harmonic, with spatial overlap between adjacent modes. In contrast, in non-bursting cases, harmonics with the same toroidal mode number but centered at different radial locations form a single broad structure with nearly identical frequencies. The results further show that, in the bursting case, minority particles remain far from the RF resonance layer, whereas in the non-bursting case they stay close to it and experience strong ICRF-driven velocity-space diffusion. This indicates that ICRF-driven velocity-space diffusion can help suppress bursting TAEs and sustain higher energetic particle beta, highlighting the sensitivity of AE dynamics to the ICRF resonance location, which may be utilized for future AE control strategies.
