Analysis of wire motion in a superconducting magnet by Monte Carlo method

The wire motion in a superconducting magnet has been analyzed by means of Monte Carlo and finite element method (FEM). A sufficient analysis about the instability originated from wire motion has not been made because the wire motion is not clarified in the irregular area in the coil. The study of the wire motion has been made in the irregular area such as "step up" or "cross over" position where a wire steps up at the flanges or crosses over the wires of the lower layer. Using FEM, the stress in the coil was calculated and the boundary conditions of the irregular area were determined. In the area using Monte Carlo method, the wire motion was analyzed. It was clarified that in the irregular area the wire motion is easily generated. The frictional heating of the magnet is discussed in connection to the mechanical behavior of a coil.