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Magnetic island bifurcation in a visco-resistive MHD fluid (2020)

  • Authors:
  • USP affiliated author: ASNIS, YURI PERES - IFSC
  • School: IFSC
  • Subjects: FUSÃO NUCLEAR; MAGNETOHIDRODINÂMICA; CAMPO MAGNÉTICO; PLASMA
  • Language: Inglês
  • Abstract: This work seeks to provide an improved understanding about the mechanisms responsible for a new class of magnetic topology bifurcations observed when an externally applied, small, non axisymmetric, resonant magnetic perturbations (RMPs) that are used to suppress instabilities known as edge localized modes, which appear in the edge of tokamak plasmas. One possible mechanism for the observed bifurcations is the Interaction between magnetohydrodynamic (MHD) modes located in different magnetic surfaces Here, this mechanism is studied through a toy model that can describe such an interaction. Firstly, an analytical model was developed using a set of ideal MHD equations to describe the effect of a m/n = 2/1 kink (non-resonant) mode on the q=3 surface, where the bifurcation is expected to occur. In this model, the externally applied RPM field is included self-consistently to account for the plasma response to such perturbations. Calculations of Poincaré sections shows that the toy model is capable of creating a m/n = 2/1 non-resonant mode that causes a kink in the magnetic field lines across the q = 3 surface. To see if such a kink is helping the iIsland to bifurcate, a set of visco-resistive MHD equations needs to be used to model the resonant modes. The ultimate goal of this work is to provide a better insight into the physics basis responsible for the island bifurcations observed in the M3D-CI simulations
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    • ABNT

      ASNIS, Yuri Peres; CANAL, Gustavo Paganini. Magnetic island bifurcation in a visco-resistive MHD fluid. [S.l: s.n.], 2020.
    • APA

      Asnis, Y. P., & Canal, G. P. (2020). Magnetic island bifurcation in a visco-resistive MHD fluid. São Carlos.
    • NLM

      Asnis YP, Canal GP. Magnetic island bifurcation in a visco-resistive MHD fluid. 2020 ;
    • Vancouver

      Asnis YP, Canal GP. Magnetic island bifurcation in a visco-resistive MHD fluid. 2020 ;

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