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Master's Dissertation
DOI
10.11606/D.43.2016.tde-08042016-104943
Document
Author
Full name
Rafael Minatogau Ferro
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2016
Supervisor
Committee
Caldas, Ibere Luiz (President)
Roberto, Marisa
Viana, Ricardo Luiz
Title in Portuguese
Transporte de partículas no Texas Helimak
Keywords in Portuguese
Caos (Sistemas dinâmicos)
Física de plasmas
Sistemas hamiltonianos
Abstract in Portuguese
Através de um mapa de ondas de deriva, estudamos o transporte de partículas no Texas Helimak, considerando diversos perfis do campo elétrico radial. O Texas Helimak é um equipamento de confinamento magnético caracterizado por linhas de campo helicoidais e que fornece uma aproximação experimental de um plasma unidimensional. Ele possibilita a imposição de um potencial elétrico externo ao plasma, chamado bias, que altera o perfil radial do campo elétrico de equilíbrio e, consequentemente, possui influência sobre as características de transporte no plasma. Para estudar o efeito do bias sobre o transporte, utilizamos um modelo que considera flutuações eletrostáticas, associadas à deriva E x B, como mecanismo de turbulência. Com isso, introduzimos um mapa de ondas de deriva, cujos parâmetros estão relacionados a dados experimentais para diversos valores de bias. Assim, ao variar o bias, pudemos observar a formação e a destruição da curva sem shear, bem como seu efeito sobre o transporte das trajetórias no espaço de fase.
Title in English
Particle Transport In Texas Helimak
Keywords in English
chaos (dynamical systems)
hamiltonian systems
Plasma Physics
Abstract in English
Using a drift wave map, we studied the particle transport in Texas Helimak considering various electric field radial profiles. Texas Helimak is a device for magnetic confinement characterized by helical field lines, and constitutes an experimental approximation to a one-dimensional plasma. It allows for the imposing of an external electric potential, known as bias, which changes the equilibrium electric field radial profile and hence the transport properties of the plasma. In order to study the effects of the bias potential on the particle transport, we used a model with electrostatic fluctuations associated to E x B drift as the turbulence mechanism. Thus, we introduced a drift wave map whose parameters are related to experimental data for various values of bias. Therefore, by varying the bias, we observed the formation and destruction of the shearless curve, as well as its effects on trajectories transport in the map's phase space.
 
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Publishing Date
2016-04-08
 
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