AXISYMMETRICAL DYNAMIC SIMULATION OF A PLASMA DISRUPTION COUPLED WITHA 3-D EDDY-CURRENT CODE

A two dimensional magnetohydrodynamic plasma model is presented and co upled to an existing three dimensional eddy current code which compute s the currents and forces induced in the plasma facing components of a tokamak. In order to simplify the coupling to the finite element base d eddy current code for the electromagnetic part of the plasma model a finite element method is applied. The fluid dynamic part is solved wi th a volume of fluid (VOF) technique which was modified to account for the preservation of the toroidal magnetic flux. This technique allows an easy and accurate tracking of the plasma boundary, which is import ant for the detection of the plasma-wall contact. Furthermore, the scr aping-off of the outmost plasma layer and the retarding effect of the toroidal halo currents on the plasma motion are modelled. With this co upled code, a given initial equilibrium state and a rough guess of the temperature profile and evolution, a representative ASDEX Upgrade dis ruption including a vertical disruption event (VDE) is simulated succe ssfully. The computation time needed for this coupled analysis is comp aratively short.