Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows
arxiv(2024)
摘要
In this work, we use the global electromagnetic and electrostatic gyro
kinetic approaches to investigate the effects of zonal flows forced-driven by
Alfvén modes due to their excitation by energetic particles (EPs), on the
dynamics of ITG (Ion temperature gradient) instabilities. The equilibrium of
the 92416 JET tokamak shot is considered. The linear and nonlinear Alfvén
modes dynamics, as well as the zonal flow dynamics, are investigated and their
respective radial structures and saturation levels are reported. ITG dynamics
in the presence of the zonal flows excited by these Alfvén modes are also
investigated. We find that, the zonal flows forced-driven by Alfvén modes can
significantly impact the ITG dynamics. A zonal flow amplitude scan reveals the
existence of an inverse relation between the zonal flow amplitude and the ITG
growth rate. These results show that, forced-driven zonal flows can be an
important indirect part of turbulence mitigation due to the injection of
energetic particles.
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