Magnetic Damping Effects on Vibration of Conductive Shells

Abstract

In conductors moving in magnetic field eddy current is induced by the electromotive force (given by v × B) that leads to the generation of Lorentz force acting against the original motion. Such kind of interaction between a moving conductor and a magnetic field is called magnetic damping. For thin structures of fusion reactors the damping effect is significant because the components are placed in a very strong magnetic field. In this paper two benchmark problems of the TEAM workshop were analyzed for verifying the numerical code developed here. A simplified model of an ITER (International Thermonuclear Experimental Reactor) first wall was also analyzed to see the magnetic damping effect on the coupled vibration of the first wall under the magnetic environment of the ITER-CDA design. A verification of the code was done by the comparison between calculated and experimental results. The effect of wall thickness on the vibration was clarified.