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Mémoire de Maîtrise
DOI
10.11606/D.43.1990.tde-22052014-142315
Document
Auteur
Nom complet
Luiz Henrique Alves Monteiro
Unité de l'USP
Domain de Connaissance
Date de Soutenance
Editeur
São Paulo, 1990
Directeur
Jury
Caldas, Ibere Luiz (Président)
Busnardo Neto, Jose
Kucinski, Mutsuko Yamamoto
Titre en portugais
Superfícies magnéticas de campos helicoidais toroidais em tokamaks.
Mots-clés en portugais
Campos magnéticos helicoidais ressonantes
Física de plasmas
Ilhas magnéticas.
Superfícies magnéticas
Resumé en portugais
Propõe-se analisar teoricamente a instabilidade disruptora que ocorre em plasmas confinados em Tokamaks, investigando-se a influencia de campos helicoidais ressonantes em seu equilíbrio. Para isso, considerou-se a superposição do campo magnético do plasma em equilíbrio MHD estático com o campo associado às ressonâncias, levando-se em conta a geometria toroidal do Tokamak. Devido a falta de simetria, as linhas do campo magnético total resultante desta superposição devem formar superfícies magnéticas apenas em algumas regiões do plasma. Usando o método da media, foram obtidas (analiticamente) funções de superfícies aproximadas que contem, em torno das regiões de ressonância do plasma, as linhas deste campo magnético total. Verificou-se que estas superfícies aproximadas têm estruturas de ilhas magnéticas.
Titre en anglais
Magnetic surfaces of toroidal helical fields in tokamaks.
Mots-clés en anglais
magnetic Islands.
magnetic surfaces
Plasma physics
resonant helical magnetic fields
Resumé en anglais
It is proposed to analyse theoretically the disruptive instability that occurs in confined plasmas in Tokamaks, through investigation of the influence of resonant helical fields on their equilibrium. With this aim, a superposition of the magnetic field of the plasma in static MHD equilibrium with the field associated with the resonances is considered, taking into account the toroidal geometry of the tokamak. Due to the lack of symmetry, the lines of the total magnetic field resulting from this superposition must form magnetic surfaces only around some regions of the plasma. Using the averaging method, functions of approximate magnetic surfaces are obtained (analitically) around the regions of resonances of the plasma (they contain the lines of this total magnetic field). It was verified that these approximate surfaces have structures of magnetic islands.
 
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44233Monteiro.pdf (10.96 Mbytes)
Date de Publication
2014-05-22
 
AVERTISSEMENT: Le matériau se réfère à des documents provenant de cette thèse ou mémoire. Le contenu de ces documents est la responsabilité de l'auteur de la thèse ou mémoire.
  • KUCINSKI, M. Y., et al. Magnetic surfaces in non-symmetric plasmas [doi:10.1088/0741-3335/34/6/012]. Plasma Physics and Controlled Fusion [online], 1992, vol. 34, p. 1067-1088.
  • KUCINSKI, M. Y., et al. Toroidal Plasma Equilibrium With Arbitrary Current Distribution. Journal of Plasma Physics , 1990, vol. 44, p. 303-311.
  • MONTEIRO, L. H. A., et al. Magnetic Structure Of Toroidal Helical Fields In Tokamaks. Physics Letters. A , 1994, vol. 193, p. 89-93.
  • OKANO, V., et al. Magnetic Islands in Low Aspect ratio Tokamaks. In V Latin American Workshop on Plasma Physics, Mexico City, 1992. Proceedings of the V Latin American Workshop on Plasma Physics.Mexico City : UNAM, 1992.
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