Title :
Experimental investigation of the dynamic stability of BI 2223 tapes
Author :
Abeln, A. ; Minor, A. ; Klemt, E. ; Knaak, W. ; Reiss, H.
Author_Institution :
Asea Brown Boveri AG, Heidelberg, Germany
fDate :
3/1/1993 12:00:00 AM
Abstract :
Bi 2223 tapes were loaded with current pulses to observe transitions to instability (quench). It was found that, if a sample was overloaded by a current the magnitude of which was several times the critical current, the time interval during which the sample withstands a quench was longer for samples with smaller critical current densities than for those with larger ones, the samples developed hot spots, which reduce the resistance against overloading and therefore reduce the dynamic stability of this material.<>
Keywords :
bismuth compounds; calcium compounds; critical current density (superconductivity); fluctuations in superconductors; high-temperature superconductors; lead compounds; quenching (thermal); strontium compounds; (BiPb)/sub 2/Sr/sub 2/Ca/sub 2/Cu/sub 3/O/sub x/; 77 K; BI 2223 tapes; critical current densities; current pulses; dynamic stability; high temperature superconductors; hot spots; quenching; thermal fluctuation; Bismuth; Ceramics; Cooling; Critical current; Pulse amplifiers; Pulse measurements; Superconducting materials; Temperature; Thermal conductivity; Thermal stability;
Journal_Title :
Applied Superconductivity, IEEE Transactions on