Acoustic emission and normal components in an alternating current superconducting coil

A study was conducted to analyze the association between acoustic emission signals induced from an ac superconducting coil and normal components in the superconducting winding during quenching. The coil was impregnated with epoxy to prevent wire motion. Results indicated that increases in acoustic emission during quenching correlated with increases in the high rate of the normal components in the superconducting winding.