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Chaotic transport in tokamak plasmas

Grant number: 22/08699-2
Support Opportunities:Regular Research Grants
Duration: December 01, 2022 - November 30, 2024
Field of knowledge:Physical Sciences and Mathematics - Physics - Physics of Fluids, Plasma Physics and Electrical Discharge
Principal Investigator:Marisa Roberto
Grantee:Marisa Roberto
Host Institution: Divisão de Ciências Fundamentais (IEF). Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil
Associated researchers: André Carlos Fraile Júnior ; Geraldo Roberson Costa Almeida ; Gustavo Paganini Canal ; Iberê Luiz Caldas ; Janileide Vieira Gomes ; Rogério Luiz Iope


It is proposed to analyze the chaotic transport of particles and plasma turbulence caused by drift waves at the tokamak edge. The chaotic layer is generated by the fluctuating electrostatic potential, which causes the anomalous transport of particles observed at the edge of tokamaks, which can degrade the plasma confinement according to its amplitude, and by the non-uniformity of the electric field shear. We propose to investigate the influence of the electric field profile on the shearless barriers by investigating the transport barriers in small shear intervals of the electric field profile. We propose to investigate the conditions for the emergence and destruction of these barriers. We will also introduce different equilibrium radial electric field profiles in order to apply the model in tokamaks operating in H mode. These profiles were fitted using experimental data from ASDEX-Upgrade. Furthermore, we will study the transport barriers under the influence of different magnetic field profiles, namely, monotonic and non-monotonic. We also intend to investigate the bifurcations of magnetic islands generated by resonant magnetic perturbations following the methodology described in our previous works. It is known that in tokamaks operating in H-mode, periodic instabilities known as edge localized modes (ELM) arise, which are responsible for the abrupt temperature rise near the divertor plates, causing the degradation of these plates. It has been demonstrated that non-axissymmetric magnetic resonant perturbations can be used to suppress ELMs. Such coils were added to the ITER base project. It is also proposed to use the M3D-C1 code to investigate the transport in tokamaks with a poloidal divertor, analyzing the so-called "footprints", which are related to the heat flux into the tokamak wall. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
OSORIO-QUIROGA, L. A.; GRIME, G. C.; ROBERTO, M.; VIANA, R. L.; ELSKENS, Y.; CALDAS, I. L.. E x B Drift Particle Transport in Tokamaks. Brazilian Journal of Physics, v. 53, n. 4, p. 11-pg., . (22/05667-2, 20/01399-8, 22/08699-2, 22/04251-7, 18/03211-6)

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