Nonlinear dynamics of nonadiabatic chirping-frequency Alfvén modes in tokamak plasmas

Author:

Wang XORCID,Briguglio S,Bottino A,Falessi MORCID,Hayward-Schneider TORCID,Lauber Ph,Mishchenko AORCID,Villard LORCID,Zonca FORCID

Abstract

Abstract Frequency chirping of Alfvén modes, a phenomenon observed in tokamak fusion plasmas driven by energetic particles (EPs), can result in significant losses of EPs. In this study, we use the global gyrokinetic code ORB5 (Lanti et al 2020 Comput. Phys. Commun. 251 107072) to investigate the nonlinear dynamics of non-adiabatic frequency chirping EP modes (EPMs). Our results illuminate non-perturbative features of EPMs caused by the presence of EPs. Additionally, we find that, with a fixed safety factor profile and a single toroidal mode number, the frequency chirping rate is linearly proportional to the mode saturation amplitude, as predicted by the theory (Chen and Zonca 2016 Rev. Mod. Phys. 88 015008).

Funder

Swiss State Secretariat for Education, Research and Innovation

Euratom Research and Training Programme

Publisher

IOP Publishing

Subject

Condensed Matter Physics,Nuclear Energy and Engineering

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