Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows
Abstract
In this work, we use the global electromagnetic and electrostatic gyro kinetic approaches to investigate the effects of zonal flows forced-driven by Alfv\'en 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 Alfv\'en 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 Alfv\'en modes are also investigated. We find that, the zonal flows forced-driven by Alfv\'en 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.
Keywords
Cite
@article{arxiv.2401.04501,
title = {Ion temperature gradient mode mitigation by energetic particles, mediated by forced-driven zonal flows},
author = {Juvert Njeck Sama and Alessandro Biancalani and Alberto Bottino and Daniele Del Sarto and Remi Dumont and Giovanni. Di Giannatale and Alain Ghizzo and Thomas Hayward-Schneider and Philipp Lauber and Ben McMillan and Alexey Mishchenko and Moahan Muruggapan and Brando Rettino and Baruch Rofman and Francesco Vannini and Laurent Villard and Xin Wang},
journal= {arXiv preprint arXiv:2401.04501},
year = {2024}
}
Comments
13 pages, 10 figures