The wire motion in a superconducting magnet has been analyzed by means of the Monte Carlo method. A sufficient analysis of the instability originating from wire motion has not been made because wire motion has not been clarified at a singular area in the coil, such as a “cross over” position where one wire crosses over other wires in the lower layer. A winding compression test was also performed and the location of disturbances in the coil was determined by the acoustic emission method. It was clarified that, in the singular area of a coil, wire motion is easily generated. The experimental results were compared with those calculated. It was confirmed that the instability in a coil originates from wire motion mainly in the singular area.
