Plasma confinement in tokamaks with robust torus |
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Authors: | CGL Martins IL Caldas |
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Institution: | a UNESP-Univ Estadual Paulista 13506-900 Rio Claro, SP, Brazilb Universidade de São Paulo; Instituto de Física 05315-970 São Paulo, SP, Brazilc Instituto Tecnológico da Aeronáutica; Departamento de Física 12228-900 São José dos Campos, SP, Brazil |
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Abstract: | We present a non-linear symplectic map that describes the alterations of the magnetic field lines inside the tokamak plasma due to the presence of a robust torus (RT) at the plasma edge. This RT prevents the magnetic field lines from reaching the tokamak wall and reduces, in its vicinity, the islands and invariant curve destruction due to resonant perturbations. The map describes the equilibrium magnetic field lines perturbed by resonances created by ergodic magnetic limiters (EMLs). We present the results obtained for twist and non-twist mappings derived for monotonic and non-monotonic plasma current density radial profiles, respectively. Our results indicate that the RT implementation would decrease the field line transport at the tokamak plasma edge. |
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Keywords: | Robust tori Transport barriers Chaos Non-linear map Hamiltonian system |
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