TRANSVERSE-FIELD LOSSES IN ALUMINUM-STABILIZED SUPERCONDUCTING CONDUCTORS

The frequency characteristic of ac losses in aluminum-stabilized super conducting conductors are investigated in order to elucidate their los s mechanism under changing transverse magnetic field. AC loss measurem ent is carried out for the short and straight sample conductor for the helical coil system of the Large Helical Device. The sample of about 50 cm in length is subjected to an ac ripple field with a frequency ra nge from 0.05 to 337 Hz superimposed on the bias field. The experiment al results show that the loss feature much depends both on direction o f the transverse magnetic field and location of the stabilizer relativ e to the strand bundle. These results are quantitatively explained by the theoretical analysis.