Title :
Electrical properties of superconducting Bi-based silver sheathed wires and coils
Author :
Fabbricatore, P. ; Gemme, G. ; Moreschi, P. ; Musenich, R. ; Parodi, R. ; Zhang, B. ; Baccaglioni, G. ; Rossi, L. ; Caracino, P. ; Vellego, G.
Author_Institution :
Istituto Nazionale di Fisica Nucl., Genova, Italy
fDate :
7/1/1994 12:00:00 AM
Abstract :
Small size S/C coils were wound with silver sheathed Bi-based (2212 compound) wires manufactured by European companies (Pirelli, LMI, Vacuumshmeltze). The coils are made by using the wind and react method. Mono-filamentary wires of length 3-5 m are wound on silver cylindrical coil former, using silica fibres for electrical insulation. The coils are then reacted in a furnace at up to 915 C for a short time to melt the BSCCO powders and at 850 C for 120 h to obtain the crystallisation of the 2212 phase. The critical current density as a function of the magnetic field is measured for both wires and coils at 77 K and 4.2 K, to study the wire degradation due to the winding. More extensive electrical and ac magnetic measurements are carried out on short samples of wire, trying to determine the irreversibility temperature up to a magnetic field of 12 T
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); high-temperature superconductors; magnetic field measurement; strontium compounds; superconducting magnets; wires (electric); Bi 2212; Bi2Sr2CaCu2O8; ac magnetic measurements; critical current density; electrical measurements; magnetic field; silver sheath; superconducting coils; superconducting wires; wind and react method; wire degradation; Cable insulation; Dielectrics and electrical insulation; Furnaces; Magnetic field measurement; Manufacturing; Silicon compounds; Silver; Superconducting coils; Superconducting filaments and wires; Wounds;
Journal_Title :
Magnetics, IEEE Transactions on
