Determination of I-V Curves of HTS Tapes From The Frequency Dependent AC Transport Loss

摘要: The current-voltage characteristics of superconductors are commonly determined by means a standard 4-probe DC measurement technique. In coated conductors, however, one often encounters problems due to weak or no stabilization and in such case, when the risk burning tape is high, approach can fail. other cases as HTS cable structures, besides vulnerability high damage, it may also be difficult achieve critical current level with power supply that normally used characterize single strands. We therefore investigated an alternative method determine I-V curve, based on measuring AC transport loss function frequency overcritical range. regime, both hysteretic component joule dissipation present for applied currents exceeding Ic. this work, measurements at different frequencies related electric fields curve similar obtained. From index N Ic values estimated. regime operation more beneficial two reasons: firstly, because very achieved easily using transformer; secondly, effective heat much lower than same amplitudes. experiment, we 4 mm wide YBCO reference 20 {\mu}m Cu-stabilization. For comparison loss, sample was measured technique remained stable even overload condition. To support our study, numerical simulations, reproducing transient stationary conditions, were performed. A relation between curves observed simulations.