Viscosity impact on 3D non-linear MHD simulations of RFP fusion plasmas

Several studies pointed out the joint role of resistivity η and viscosity ν in determining dynamics emergence helical regimes reversed-field pinch (RFP) plasmas. In this framework, self-consistent time evolution coefficients still lacks a fully satisfying modeling, being constrained by many approximations. work, hypothesis flat profile is relaxed: A inspired Braginskii perpendicular implemented code. This choice motivated fact that magnetohydrodynamics field instabilities relevant for RFP configuration (resistive-kink/tearing modes) are active direction to magnetic field. Such non-monotonous causes localized damping plasma flow regions, where stronger, close edge. results reduction shear, turn allowing enhancement edge modes amplitude. The impact on topology connection length wall also analyzed.