"S. Nomura,K. Tsuboi,K. Ito,H. Tsutsui,SHUNJI IIO,A. Ninomiya,R. Shimada","Acoustic Emission in a Superconducting Force-Balanced Helical Coil",,"IEEE Trans. Appl. Supercond.",,"Vol. 21",,"p. 1636-1639",2011,Oct.