Heat Leak Optimisation of a High-Temperature-Superconductor Current Lead Between Sixty-Four Kelvin and Four Kelvin

This paper presents a computed design for a HTS current lead intended for cryogenic current delivery, with its performance, resource budgets and margins derived from stated assumptions rather than asserted. The headline results are: heat arriving at 4.2 K per kiloampere for the hybrid lead of 0.048 W per kA; heat arriving at 4.2 K per kiloampere for an optimised all-copper lead of 46.9 W per kA; reduction factor in cold-end leak from the hybrid design of 976 dimensionless; total 4.2 K load from the lead pair at rated current of 0.096 W; heat to be removed at the 64 K intercept per lead of 91.6 W. Each figure was produced by the deposited computation from the inputs listed in the Methods, and the sensitivity of the conclusions to those inputs is examined in the Discussion. The design is a paper study: it is labelled, on its face and in this abstract, SIMULATED, NOT MEASURED, and no quantity reported here is a measurement of built hardware.