Non-linear dynamics of plasma with surface current in tokamak disruption events

The Disruption Simulation Code (DSC), which was initially implemented in 2D (single helicity) geometry, has recently been developed in a fully 3D toroidal geometry with adaptation to the moving plasma boundary. DSC-3D simulates free-boundary ideal one-fluid MHD non-linear dynamics of plasma separated from conducting in-vessel structures by a vacuum region. The vacuum magnetic field is calculated using both Green's functions and Poisson equation methods. Different regimes of plasma-touching-wall scenarios, leading to the formation of a Hiro current,\footnote{L.E. Zakharov. Phys. Plasmas, v.15, 062507 (2008)}$^,$\footnote{L.E. Zakharov, S.A. Galkin, S.N. Gerasimov, Phys. Plasmas 19, 055703 (2012)} will be discussed. Corresponding sideways forces applied to the plasma-facing components and to the vacuum vessel will be calculated. Progress on the DSC-3D development, including both ideal and resistive one-fluid MHD models, will be presented. Implementation of the resistive MHD model, together with a realistic wall model, will enable DSC-3D to address the MHD issues of the entire disruption problem. This will also be an important step toward the prediction of disruptions in ITER and understanding opportunities for mitigation schemes.