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Master's Dissertation
DOI
https://doi.org/10.11606/D.43.2021.tde-07042021-183837
Document
Author
Full name
Bruno Borges Leal
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2021
Supervisor
Committee
Caldas, Ibere Luiz (President)
Carvalho, Ricardo Egydio de
Szezech Junior, Jose Danilo
Title in Portuguese
Descrição simplética do escape das linhas magnéticas em tokamaks
Keywords in Portuguese
Limitador ergódico magnético; Escape das linhas de campo.
Tokamak; Confinamento magnético
Abstract in Portuguese
O campo magnético na borda do plasma confinado em tokamaks apresenta ilhas magnéticas e linhas magnéticas caóticas. Detalhes dessa configuração são importantes para a melhoria do confinamento do plasma. Em particular, o escape das linhas magnéticas tem sido investigado para explicar o aquecimento excessivo de algumas partes da parede do tokamak. Para investigar o escape das linhas caóticas nós usamos o mapa simplético de Ullmann, que fornece as seções de Poincaré do campo magnético de equilbrio perturbado por um limitador magnético. Nós consideramos a ação de dois limitadores ergódicos para criar uma perturbação ressonante com números de onda poloidal e toroidal definidos. Assim, obtivemos a distribuição do escape associado ao aprisionamento das linhas caóticas ao redor das linhas magnéticas.
Title in English
Symplectic Description of Magnetic Escape Lines in Tokamaks
Keywords in English
Tokamak; Magnetic confinement; Ergodic Magnetic limiter; Magnetic lines escape.
Abstract in English
The magnetic field at the tokamak plasma edge has magnetic islands and chaotic lines. Details of this configuration are important to improve the plasma confinement. In particular, the magnetic lines escape has been investigated to explain the excessive heating of some tokamak wall sections. To investigate the chaotic lines escape we apply the symplectic Ullmann map, which gives the Poincaré sections of the magnetic equilibrium field perturbed by an ergodic limiter. Furthermore, we consider the action of two ergodic limiters in order to create a resonant perturbation with chosen poloidal and toroidal wave numbers. Thus, we obtained the distribution of the escape associated to the chaotic lines stickiness around the magnetic islands.
 
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LealBrunoME.pdf (14.13 Mbytes)
Publishing Date
2021-04-08
 
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