Simulation Method and Code Development for Non-Axisymmetric Eddy Currents on Vacuum Vessels

An electric current is induced on the vacuum vessel when the toroidal current of a tokamak plasma varies in time, and it is called the eddy current. During disruption, the eddy current becomes large and influences the process of disruption by interacting with the confined plasma. We have developed a new non-axisymmetric eddy current simulation code, the Keddy3D that solves the eddy current equation based on the thin-wall approximation. The Keddy3D is suitable for simulating long-term non-axisymmetric disruption processes with low computational costs.