Theoretical and Experimental Analysis of the Destabilization of Modes Driven by Fast Particles in Tore-Supra
Résumé
A necessary step towards the control of burning plasmas is the understanding of instabilities driven by suprathermal particles, which are known to be dangerous for the plasma confinement. The mechanisms underlying their destabilization are studied for two modes identified in Tore-Supra. Linearly, experimental and analytical evidences are presented which show the strong sensitivity of the fast electron driven fishbone stability on the current profile, and the non-negligible role of diamagnetic effects and fast particle induced non-perturbative effects on non-chirping steady-state Beta Alfvén Eigenmodes. Nonlinearly, the main damping mechanism acting on Beta Alfvén Eigenmodes is shown to enable the existence of subcritical modes.
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