Angular dependence of ac losses in stacked Bi2Sr2Ca2Cu3O10/Ag tapes

The angular dependence of the losses in ac applied fields were measured using stacked Bi(2223)/Ag tapes having the angles with the direction of applied fields of 0, 7.5, 15, 30, 45, 60, and 90 degrees. The measured values of the losses were compared with the calculated values. The calculations were performed assuming that the losses were a sum of those for the currents circulating in the plane of and across the tapes. At high fields, a good agreement between the measured and the calculated losses were observed while at the low fields, the calculated did not account for the variation. (C) 2001 Elsevier Science B.V. All rights reserved.