Experimental investigation of the dynamic stability of BI 2223 tapes

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.<
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