Stability Analysis of Forced-Flow Cooled Superconductor

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A numerical analysis of the thermal stability of a superconductor composite cooled by forced-flow supercritical helium has been conducted and the influence of several parameters on the thermal stability examined. The results are summarized as follows. 1.When quenching occurs, the helium pressure rises rapidly and the normal zone propagates towards the up- and downstream directions. 2.The stability limit increases with an increase in the initial flow velocity and the diameter of the coolant passage, and with a decrease in the helium temperature and the transport current. 3.When transport current is small, the effect of initial flow velocity is remarkable on stability limit. 4.In the condition of large transport current, transient heat transfer has much larger effect than initial flow velocity. 5.The larger transport current is, the larger the effect of initial helium temperature is on stability limit. 6.The larger the coolant passage is, the less the effect of helium flow velocity is on stability limit. 7.The conductor stability does not depend on the initial pressure covered in the present analysis (0.3-0.8[MPa]). 8.The effect of initial transient heat transfer is very large, it is decided mostly within some 10 [ms] after heat disturbance whether superconductor quenches or not.