Liquid Temperature Effects on Thermally Influenced Transition Currents of Nb-Alloy Superconducting Solenoids in He I and He II
In some technical applications of superconductivity dissipative processes cannot be avoided and heat removal is necessary, at least for a limited period of time. The thermal energy often flows through several solid materials and finally has to be transmitted to cryogenic liquid or fluid. At the λ-point, because of the change from He I to superfluid He II, the thermal boundary conductance is affected by the quantum condensation phenomenon. In particular, at the peak heat flux, prior to the onset of film boiling, the thermal conductance is changed distinctly. Therefore, when thermal boundary effects are relatively large in comparison to other impedances, the λ-transition is expected to change the values of thermally limited quenching currents of superconductivity.
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