Title :
Development of superconducting magnets using Bi-2212/Ag tapes
Author :
Tomita, N. ; Arai, M. ; Yanagisawa, E. ; Morimoto, T. ; Kitaguchi, H. ; Kumakura, H. ; Togano, K. ; Kiyoshi, T. ; Inoue, K. ; Maeda, H. ; Nomura, K. ; Vallier, J.C.
Author_Institution :
Res. Center, Asahi Glass Co. Ltd., Yokohama, Japan
fDate :
6/1/1995 12:00:00 AM
Abstract :
Several pancake type superconducting coils were fabricated using Bi-2212/Ag tapes prepared by the combination of continuous dip-coating process and melt-solidification and tested in various temperatures and bias fields. A small Bi-2212/Ag double stacked pancake coil(13 mm/spl phi/ (inner bore)/46.5 mm/spl phi/ (outer diameter)) was used as an insert magnet of a conventional superconducting magnet system. In the bias field of 20.9 T, the generated field of the Bi-2212/Ag coil was of the Bi-2212/Ag coil was 0.9 T, at the I/sub c/ of 310A (criterion 10/sup -13/ /spl Omega/m), in the saturated superfluid helium temperature (/spl sim/1.8 K). Thus, this superconducting magnet system achieved generation of magnetic field of 21.8 T in the full superconducting state. A larger Bi-2212/Ag double stacked pancake type magnet (20 mm/spl phi/ (inner bore)/spl times/94 mm/spl phi/ (outer)) was also fabricated. The generated fields of the magnet at 4.2 K in 0 and 20 T bias fields were 2.6 T (I/sub c/=385A(10/sup -13/ /spl Omega/m)) and 1.08 T (I/sub c/=160 A(2/spl times/10/sup /spl times/13/ /spl Omega/m)), respectively. At about 20 K, in helium gas, the generated field of the magnet was 1.53 T (I/sub c/=225A(10/sup -13/ /spl Omega/m)).<>
Keywords :
bismuth alloys; magnetic fields; silver alloys; superconducting coils; superconducting magnets; superconducting tapes; 0.9 T; 1.08 T; 1.53 T; 1.8 K; 13 mm; 160 A; 2.6 T; 20 K; 20 T; 20 mm; 20.9 T; 21.8 T; 225 A; 310 A; 385 A; 4.2 K; 46.5 mm; 94 mm; Bi-2212/Ag tapes; BiAg; continuous dip-coating process; double stacked pancake coil; fabrication; magnetic field; melt-solidification; saturated superfluid helium temperature; superconducting coils; superconducting magnets using; High temperature superconductors; Magnetic fields; Powders; Saturation magnetization; Silver; Superconducting coils; Superconducting films; Superconducting magnets; Testing;
Journal_Title :
Applied Superconductivity, IEEE Transactions on