Numerical methods for the magneto-mechanical coupling analysis of invessel components in Tokamak devices

Magneto-mechanical coupling vibration arises in the in-vessel components of Tokamak device especially during the plasma disruption.Strong electromagnetic forces cause the structures to vibrate while the motion in turn changes the distribution of the electromagnetic field.To ensur the Tokamak devices operating in a designed state,numerical analysis on the coupling vibration i of great importance.This paper introduces two numerical methods for the magneto-mechanica coupling problems.The coupling term of velocity and magnetic flux density is manipulated in both Eulerian and Lagrangian description,which brings much simplification in numerica implementation.Corresponding numerical codes have been developed and applied to th dynamic simulation of a test module in J-TEXT and the vacuum vessel of HL-2M during plasm disruptions.The results reveal the evident influence of the magnetic stiffness and magneti damping effects on the vibration behavior of the in-vessel structures.Finally,to deal with the halo current injection problem,a numerical scheme is described and validated which can simulate th distribution of the halo current without complicated manipulations.