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|Type:||Artigo de periódico|
|Title:||Tokamak, reversed field pinch and intermediate structures as minimum-dissipative relaxed states|
|Abstract:||The principle of minimum energy dissipation rate is utilized to develop a unified model for relaxation in toroidal discharges. The Euler-Lagrange equation for such relaxed states is solved in toroidal coordinates for an axisymmetric torus by expressing the solutions in terms of Chandrasekhar-Kendall (C-K) eigenfunctions analytically continued in the complex domain, The C-K eigenfunctions are hyppergeometric functions that are solutions of the scalar Helmholtz equation in toroidal coordinates in the large-aspect-ratio approximation. Equilibria are constructed by assuming the total current J=0 at the edge. This yields the eigenvalues for a given aspect-ratio. The most novel feature of the present model is that solutions allow for tokamak, low-q as well as reversed field pinch-like behavior with a change in the eigenvalue characterizing the relaxed state. (C) 2000 American Institute of Physics. [S1070-664X(00)01001-1].|
|Editor:||Amer Inst Physics|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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