Measurement and FEM analysis of magnetization loss in HTS tapes

Magnetization loss of Bi-2223/Ag tapes was measured with several types of p ick-up coils to study the influence of pick-up coil configuration and sampl e length on the measured losses, Magnetic flux distributions in tapes were calculated numerically by the finite element method to obtain their AC loss es, The numerical and experimental losses were compared with each other to clarify the nature of the measured AC losses. In the parallel magnetic fiel d, the height of the pick up coil must equal or be larger than the tape hei ght for the accurate loss measurement, In the perpendicular magnetic field, the size of the pick up coil must be much larger than the tape width for t he accurate loss measurement. If the length of the sample tape is short, th e measured loss contains coupling loss component at commercial frequencies, while the filaments are almost decoupled in DC measurement by SQUID magnet ometer.