Title :
Grain-aligned YBCO superconducting current leads for conduction-cooled applications
Author :
Herd, K.G. ; Dorri, B. ; Laskaris, E.T. ; Tkaczyk, J.E. ; Lay, K.W.
Author_Institution :
GE Corp. Res. & Dev. Center, Schenectady, NY, USA
fDate :
3/1/1993 12:00:00 AM
Abstract :
Grain-aligned YBCO superconductors have been developed for use in a conduction-cooled, cryogen-free superconducting magnet application. A magnetic alignment technique has been used to orient the c-axis of the YBCO grains. Current leads 0.3*1.4*6.4 cm were fabricated and thermally connected between the first and second stage of a Gifford-McMahon cryocooler. The heat conduction down the leads was determined from a load map of the cryocooler. With operating temperatures of 40 K on the first stage and 10 K on the second stage, the measured heat leak was 0.15 W/lead. The YBCO current leads were used to power a conduction-cooled Nb/sub 3/Sn magnet at 10 K to 250 A. Test results for the YBCO leads are reported.<>
Keywords :
barium compounds; critical current density (superconductivity); heat conduction; high-temperature superconductors; niobium alloys; superconducting magnets; tin alloys; yttrium compounds; 10 K; 250 A; 40 K; Gifford-McMahon cryocooler; Nb/sub 3/Sn conduction cooled magnet; YBCO superconducting current leads; YBaCuO grain aligned superconductors; critical current density; cryogen-free superconducting magnet; heat conduction; heat leak; magnetic alignment technique; High temperature superconductors; Magnetic levitation; Magnetic shielding; Niobium-tin; Superconducting magnets; Superconductivity; Testing; Thermal conductivity; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
