Abstract
Instability arising in a superconducting composite when the current is injected with an ultimately low rate is analyzed. Under these conditions, the nonuniformity of the temperature and electric field distributions over the composite cross section is negligibly small. Equations that allow one to estimate the effect of the magnetic flux creep on the maximum current and temperature of the superconductor before the onset of instability are derived. It is shown that the allowable overheat of the composite depends on conditions of its thermal stabilization especially near the steady-state stabilization range. It is noted that conditions for the existence of stable current states may differ when the magnetic flux creep is described by power and exponential I-V characteristics.
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