(Y, Ho)-Ba-Cu-O bulk samples have been prepared by the unidirectional solidification method. Since these samples exhibit low thermal conductivity and high critical current density, it is desirable to apply Y-based bulk sample to current lead, especially for a large-scale superconducting apparatus. A high-
Tc superconducting current lead model using (Y, Ho)-Ba-Cu-O bulk has successfully transported a high current of 7, 550A. Warm ends of bulk samples were 50.3K and 45.8K, respectively, at 7, 550A. The liquid helium boil-off rate was 4.39
l/h at 5, 560A, which corresponds to 3.1W heat leakage. The cryogenic heat load was reduced to about half the value of a conventional copper current lead.
抄録全体を表示