Abstract
Three superconducting magnets for hybrid magnets and a number of independent superconducting magnets have been installed in the High Field Laboratory for Superconducting Materials. Most type of these superconducting magnets are pancake wound coils. AE event counting rate of pancake wound coils were measured as a function of a coil current. The typical AE patterns of pancake wound coils were observed. The results indicated that the pancakes were moved along the coil axis. The difference of AE patterns between just before and after recompression of magnet were discussed. The usefulness of supervising pancake wound magnets with AE technique were also discussed.
