Ion Temperature Gradient Mode Mitigation by Energetic Particles, Mediated by Forced-Driven Zonal Flows

Juvert Njeck Sama,Alessandro Biancalani,Alberto Bottino,Daniele Del Sarto,Remi Dumont,Giovanni. Di Giannatale,Alain Ghizzo,Thomas Hayward-Schneider,Philipp Lauber,Ben McMillan,Alexey Mishchenko, Moahan Muruggapan,Brando Rettino,Baruch Rofman, Francesco Vannini,Laurent Villard, Xin Wang

Physics of plasmas（2024）SCI 3区

Université de Lorraine

Cited 0|Views37

Abstract

In this work, we use the global electromagnetic and electrostatic gyrokinetic approaches to investigate the effects of zonal flows forced-driven byAlfvén modes due to their excitation by energetic particles (EPs), on thedynamics of ITG (Ion temperature gradient) instabilities. The equilibrium ofthe 92416 JET tokamak shot is considered. The linear and nonlinear Alfvénmodes dynamics, as well as the zonal flow dynamics, are investigated and theirrespective radial structures and saturation levels are reported. ITG dynamicsin the presence of the zonal flows excited by these Alfvén modes are alsoinvestigated. We find that, the zonal flows forced-driven by Alfvén modes cansignificantly impact the ITG dynamics. A zonal flow amplitude scan reveals theexistence of an inverse relation between the zonal flow amplitude and the ITGgrowth rate. These results show that, forced-driven zonal flows can be animportant indirect part of turbulence mitigation due to the injection ofenergetic particles.

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Zonal Flows

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