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Control of instabilities by Alfvén waves and resonant magnetic perturbations in magnetized plasmas

Grant number: 14/50794-6
Support type:Regular Research Grants
Duration: September 01, 2015 - August 31, 2017
Field of knowledge:Physical Sciences and Mathematics - Physics
Cooperation agreement: CNRS
Mobility Program: SPRINT - Projetos de pesquisa - Mobilidade
Principal Investigator:Iberê Luiz Caldas
Grantee:Iberê Luiz Caldas
Principal investigator abroad: Sadrudrin Benkkada
Institution abroad: Aix-Marseille Université (AMU), France
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:11/19296-1 - Nonlinear dynamics, AP.TEM

Abstract

The MHD instabilities driven by fast particles, produced by fusion reactions, are an important issue for tokamak plasmas. The effects of these instabilities on the confinement and on other MHD instabilities are still unclear. We will investigate the excitation threshold and dynamics of these modes in order to evaluate models used to predict their effect in next fusion devices. Resonant magnetic perturbations and Alfvén waves are an important tool to mitigate the instabilities in plasmas and to improve the confinement of energy and particles. Considering the EMEDGE3D code, the full MHD three-dimensional model will be used to study the instabilities mitigation along with simplified one-dimensional models to provide a better understanding of the physical mechanisms for plasma confinement. We will also investigate wave-particle interactions using the travelling wave tube (TWT) of the Aix-Marseille University. In the TWT, an electron beam moves under the action of an axial magnetic field and electrostatic waves. A system similar to the TWT has been studied on a theoretical basis by the Plasma Group of the University of São Paulo. As part of this contribution, we will analyses 14 the dynamics of both low and high-density beams, and check experimentally the validity of theoretical results and numerical codes. (AU)