AC Loss Calculations for HTSC Current Lead Modules
In applications of low temperature superconductors losses are often dominated by the heat load due to current leads. Compared to conventional metal current leads the use of HTSC modules for the low temperature part can considerably reduce the heat released at the cold end of the current lead. In contrast to DC applications, the losses in the HTSC modules for AC application strongly depend on the cross sectional shape. In this work the temperature distributions of bulk HTSC current lead modules are calculated by numerical solution of the one dimensional heat conduction equation. Limitations of the critical state model, which is used to estimate the self field losses, are discussed. The impact of the module’s geometry on the low temperature heat load is shown for circular rod and tube type modules. Guidelines for the geometrical layout of such modules are given.
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